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WO2018179832A1 - Moteur - Google Patents

Moteur Download PDF

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Publication number
WO2018179832A1
WO2018179832A1 PCT/JP2018/003656 JP2018003656W WO2018179832A1 WO 2018179832 A1 WO2018179832 A1 WO 2018179832A1 JP 2018003656 W JP2018003656 W JP 2018003656W WO 2018179832 A1 WO2018179832 A1 WO 2018179832A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
resin casing
bearing
motor
press
Prior art date
Application number
PCT/JP2018/003656
Other languages
English (en)
Japanese (ja)
Inventor
康伸 柚木
将之 石川
Original Assignee
日本電産テクノモータ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産テクノモータ株式会社 filed Critical 日本電産テクノモータ株式会社
Priority to KR1020197025953A priority Critical patent/KR20190111113A/ko
Priority to JP2019508674A priority patent/JPWO2018179832A1/ja
Priority to CN201880022796.7A priority patent/CN110521092A/zh
Publication of WO2018179832A1 publication Critical patent/WO2018179832A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the present invention relates to a motor.
  • Patent Document 1 discloses an electric motor that suppresses generation of a shaft voltage.
  • the electric motor described in Patent Document 1 includes a stator in which a fixing member including a stator core around which windings are wound is molded with an insulating resin, a rotor disposed against the stator around a shaft, and A bearing that rotatably supports the shaft, a bracket that fixes the bearing, and a drive circuit board on which a drive circuit that drives the winding is mounted.
  • the stator core is connected to the core connection terminal, and by inserting the core connection terminal into the drive circuit board, the stator core and the ground as the zero potential reference on the drive circuit board are electrically connected. ing.
  • the stator core is considered to be a voltage source that induces high-frequency voltage in the bearing inner ring and bearing outer ring when driving the switching element that drives the motor.
  • the stator core is connected to the ground on the drive circuit board, and the stator core The shaft voltage is reduced by setting the potential of the iron core to zero potential.
  • the mold resin holds the conductive member, and external force acts on the conductive member, so that the mold resin is cracked or a gap is opened between the conductive member and the mold resin. Thereby, it becomes easy for external moisture to enter the inside of the mold resin, or the conductive member and the stator core do not come into contact with each other.
  • an object of the present invention is to provide a motor capable of protecting from external impact and taking measures against electrolytic corrosion of a bearing while suppressing an increase in the number of parts.
  • An exemplary motor of the present invention includes a rotor having a rotating shaft extending along a central axis, and a plurality of windings wound around a stator core that is radially opposed to the outer peripheral surface of the rotor via an insulator.
  • a stator a resin casing that seals at least the insulator and the winding of the stator, a plurality of bearings that rotatably support the rotating shaft at positions spaced apart from each other in the axial direction, and an outer peripheral surface of the resin casing
  • the stator includes a plurality of bearing housing members in which the plurality of bearings are respectively housed.
  • the conductive member is supported by the cover, and the conductive member is energized.
  • the member has a contact portion that contacts the stator core on one side and a ground portion that is grounded on the other side, and the bearing and the energizing member are electrically insulated. To.
  • the exemplary motor of the present invention it is possible to provide a motor capable of taking measures against electrolytic corrosion of a bearing while suppressing an increase in the number of parts.
  • FIG. 1 is an exploded perspective view of an example of a motor according to the present invention.
  • FIG. 2 is a cross-sectional view of the motor shown in FIG.
  • FIG. 3 is a perspective view of the stator core.
  • FIG. 4 is a perspective view of a stator core provided in the stator.
  • FIG. 5 is a perspective view of the rotor.
  • FIG. 6 is a partial cross-sectional view showing a resin casing and a cover of a modified example of the motor according to the first embodiment.
  • FIG. 7 is a partial cross-sectional view showing a resin casing and cover of another modification of the motor according to the first embodiment.
  • FIG. 8 is an exploded perspective view of another example of the motor according to the present invention.
  • FIG. 8 is an exploded perspective view of another example of the motor according to the present invention.
  • FIG. 9 is a cross-sectional view of the motor shown in FIG.
  • FIG. 10 is a cross-sectional view of still another example of the motor according to the present invention.
  • FIG. 11 is an exploded perspective view of still another example of the motor according to the present invention.
  • 12 is a cross-sectional view of the motor shown in FIG.
  • FIG. 13 is a cross-sectional view of a modified example of the motor according to the fourth embodiment.
  • FIG. 14 is a cross-sectional view of still another example of the motor according to the present invention.
  • FIG. 1 is an exploded perspective view of an example of a motor according to the present invention.
  • FIG. 2 is a cross-sectional view of the motor shown in FIG.
  • the direction in which the central axis Ax extends that is, the left-right direction in FIG. A direction perpendicular to the axial direction is a radial direction
  • a tangential direction of a circle centering on the axis is a circumferential direction.
  • the axial direction is set as follows with reference to FIG. That is, in FIG. 2, a direction toward the right side in the axial direction is defined as a first direction Op, and a direction toward the left side is defined as a second direction Or.
  • the “left direction” and “right direction” in this document are set for explanation. Therefore, these directions do not limit the direction when the motor A is actually used.
  • the motor A includes a stator 1, a resin casing 2, a cover 3, a rotor 4, a first bearing 51, a second bearing 52, a current-carrying member 8,
  • the resin casing 2 covers the outer peripheral surface of the stator 1. That is, the motor A is a so-called molded motor in which the stator 1 is sealed with the resin casing 2.
  • the rotor 4 is disposed inside the stator 1.
  • the rotor 4 includes a rotating shaft 40 that extends along the central axis Ax. The rotating shaft 40 is supported by the first bearing 51 and the second bearing 52 and can rotate with respect to the stator 1.
  • the motor A according to the present embodiment is an inner rotor type DC brushless motor in which the rotor 4 rotates inside the stator 1. And a some bearing (51, 52) supports the rotating shaft 40 rotatably in the position mutually spaced apart to the axial direction.
  • FIG. 3 is a perspective view of the stator core.
  • FIG. 4 is a perspective view of a stator core provided in the stator.
  • the stator 1 includes a stator core 11, an insulator 12, and a winding 13.
  • the stator 1 has a plurality of windings 13 wound around a stator core 11 that is radially opposed to the outer peripheral surface of the rotor 4 via an insulator 12.
  • the stator 1 includes a first bearing housing member 61 in which the first bearing 51 is housed, and a second bearing housing member 62 in which the second bearing 52 is housed. That is, the stator 1 includes a plurality of bearing housing members (61, 62) in which a plurality of bearings (51, 52) are respectively housed.
  • the stator core 11 has conductivity. As shown in FIG. 4, the stator core 11 includes an annular core back portion 111 and a teeth portion 112. The core back portion 111 has an annular shape that extends in the axial direction. The teeth portion 112 protrudes radially inward from the inner peripheral surface of the core back portion 111. As shown in FIG. 4, the stator core 11 includes twelve teeth portions 112. The teeth parts 112 are arranged at equal intervals in the circumferential direction. That is, in the motor A of the present embodiment, the stator 1 has 12 slots.
  • the insulator 12 covers the stator 11.
  • the insulator 12 is a resin molded body.
  • the insulator 12 covers the whole tooth portion 112 and covers both end surfaces of the core back portion 111 in the axial direction.
  • the insulator 12 includes an insulator tooth portion 121 that covers the tooth portion 112 and an insulator core back portion 122 that covers at least the axial end of the core back portion 111.
  • a winding wire 13 is formed by winding a conductive wire around a tooth portion 112 (insulator tooth portion 121) covered with the insulator 12.
  • the insulator 12 insulates the stator core 11 and the winding 13 from each other.
  • the insulator 12 is a resin molded body, but is not limited thereto. The structure which can insulate the stator core 11 and the coil
  • winding 13 is employable widely.
  • the insulator 12 insulates the stator core 11 and the winding 13. Therefore, in the stator core 11, the radially outer peripheral surface of the core back portion 111 may be exposed without being covered with the insulator 12.
  • the stator core 11 may have a structure in which electromagnetic steel plates are laminated, or may be a single member such as powder firing or casting. Further, the stator core 11 may be configured to be divided into divided cores including one tooth portion 112, or may be formed by winding a belt-shaped member.
  • the windings 13 are disposed on each of the tooth portions 112 of the stator core 11. That is, in the motor A, twelve windings 13 are arranged.
  • the twelve windings 13 provided in the stator 1 are divided into three systems (hereinafter referred to as three phases) according to the timing at which current is supplied. These three phases are referred to as a U phase, a V phase, and a W phase, respectively. That is, the stator 1 includes four U-phase windings, four V-phase windings, and four W-phase windings. In the following description, the windings of the respective phases are collectively described as the windings 13.
  • the stator 1 is connected to a plurality of windings 13 or connected to a control circuit (not shown) connected to the windings 13 and a substrate Bd provided in the motor A. 131.
  • the crossover part 131 is arrange
  • the stator 1 includes a wiring portion 120 in which a crossover wire 131 is disposed on a radially outer surface of the insulator 12 that covers an end surface of the core back portion 111 on the first direction Op side.
  • the resin casing 2 has a cylindrical shape.
  • the resin casing 2 is a resin molded body in which the stator core 11 is sealed. That is, the resin casing 2 seals at least the insulator 13 and the winding 12 of the stator 1.
  • the motor A also covers the outer surface in the radial direction of the stator core 11.
  • the resin casing 2 has a bottomed cylindrical shape in which at least a part of the end portion on the first direction Op side is closed. And the resin casing hole 20 extended in an axial direction is provided in the radial direction center part of a bottom part.
  • a concave hole 21 that is recessed in the axial direction is provided on the radially outer side of the resin casing hole 20 on the end surface on the first direction Op side of the bottom.
  • a rotating shaft 40 attached to the rotor 4 passes through the resin casing hole 20 in the axial direction.
  • the first bearing housing member 61 is fixed to the resin casing hole 20 by insert molding. The details of the first bearing storage 61 will be described later.
  • the cover 3 covers the outer peripheral surface of the resin casing 2.
  • the cover 3 has a bottomed cylindrical shape in which at least a part of the end on the first direction Op side is closed. That is, the cover 3 has a cylindrical shape extending in the axial direction.
  • the cover 3 is formed, for example, by extruding a metal plate.
  • the cover hole 30 penetrated to an axial direction is provided in the radial direction center part of the bottom part of the cover 3.
  • a casing contact portion 31 that protrudes inward in the axial direction (in the second direction Or side in FIG. 2) is provided outside the cover hole 30 in the radial direction. That is, the cover 3 includes a casing contact portion 31 that protrudes inwardly into the radial center of the bottom portion, and includes a cover hole 30 in the center of the casing contact portion 31.
  • the resin casing 2 is inserted into the cover 3 on the first direction Op side in FIG. Then, a press-fit portion 22 described later is press-fitted into the cover 3.
  • the casing contact portion 31 overlaps the recessed hole 21 in the axial direction.
  • the resin casing hole 20 and the cover hole 30 also overlap in the axial direction.
  • the rotation shaft 40 passes through the resin casing hole 20 and the cover hole 30.
  • the casing contact portion 31 comes into contact with the recessed hole 21.
  • the casing contact portion 31 presses the concave hole 21 so that the resin casing 2 and the cover 3 are in close contact with each other. Thereby, the entry of gas, water, dust, dust and the like from the boundary portion between the resin casing 2 and the cover 3 from the boundary portion between the resin casing hole 20 and the cover hole 30 is suppressed.
  • the resin casing 2 includes a press-fit portion 22 and a concave portion 23 on a radially outer peripheral surface. That is, the resin casing 2 includes a press-fit portion 22 that is press-fit into the cover 3. As shown in FIG. 2, the press-fit portion 22 is provided in a portion overlapping the stator core 11 on the outer peripheral surface of the resin casing 2 in the radial direction. That is, the press-fit portion 22 overlaps the stator core 22 when the resin casing 2 is viewed in the radial direction.
  • the resin casing 2 is inserted into the opening of the cover 3 from the end on the side where the recess 23 is formed. Thereafter, the resin casing 2 is fixed to the cover 3 by press fitting.
  • the resin casing 2 is press-fitted into the inner peripheral surface of the cover 3 at the press-fitting portion 22.
  • the press-fit portion 22 is provided at a position overlapping the stator core 11 in the radial direction. At the time of press fitting, force acts on the resin casing 2 from the cover 3 in the radial direction and the axial direction. Since the press-fit portion 22 is provided at a position that overlaps the stator core 11 having a higher strength than the resin of the resin casing 2 in the radial direction, even if a force is applied from the cover 3 during press-fit, the deformation of the resin casing 2 is unlikely to occur. .
  • the concave portion 23 overlaps with the wiring portion 120 in which the crossover portion 131 of the insulator 12 on the outer peripheral surface of the resin casing 2 is arranged in the radial direction.
  • the recessed part 23 is provided in the edge part by the side of the 1st direction Op of the resin casing 2, and is formed continuously in the circumferential direction. In this embodiment, although formed in the radial direction edge part of the resin casing 2, it is not limited to this.
  • the outer peripheral surface of the resin casing 2 is provided with a concave groove 200 extending from the concave portion 23 toward the second direction Or side.
  • the condensed water accumulated in the concave portion 23 passes through the concave groove 200 and is discharged to the outside from between the second bearing housing member 62 and the cover 3.
  • the concave groove 200 may be omitted. Even if the concave groove 200 is omitted, the condensed water evaporates into the air in the concave portion 23 due to heat generated when the motor A is driven. If the condensed water cannot be drained outside the resin casing due to the shape of the cover, etc., a drain hole that penetrates to the outside may be formed in the cover or the bearing housing member, and drained using the drain hole. .
  • the resin casing 2 is inserted into the cover 3 from the side where the recess 23 is provided in the axial direction, and fixed by press-fitting.
  • a gap Gp is formed in the radial direction between the portion where the recess 23 is formed and the inner surface of the cover 3. The details of the gap Gp between the resin casing 2 and the cover 3 will be described later.
  • the radial thickness of the portion of the resin casing 2 where the recess 23 is provided is thinner than the thickness of the other portion of the resin casing 2. That is, the portion where the concave portion 23 is provided is a thin portion 24 having a smaller thickness than other portions.
  • FIG. 5 is a perspective view of the rotor.
  • the rotor 4 includes a rotor core 41, a plurality of magnets 42, and a mold part 43.
  • the rotor core 41 includes a tubular member 411 extending in the axial direction and a shaft support member 412 disposed on the radially inner side of the tubular member.
  • the cylindrical member 411 and the shaft support member 412 are fixed to each other by a mold part 43 which is a resin molded product.
  • the rotor core 41 is a magnetic body.
  • the rotor core 41 may be a laminated body in which magnetic plates are laminated in the radial direction, or may be a molded body formed by sintering a powder as the same member, for example.
  • the rotary shaft 40 has a cylindrical shape.
  • the rotary shaft 40 passes through the central portion in the radial direction of the shaft support member 412 of the rotor core 41.
  • the rotating shaft 40 and the shaft support member 412 are relatively fixed. Examples of the fixing method include press-fitting and welding, but are not limited thereto.
  • a method that can fix the rotating shaft 40 and the shaft support member 412 can be widely employed. That is, the rotating shaft 40 is fixed to the rotor 4, and the rotating shaft 40 rotates about the central axis Ax when the rotor 4 rotates.
  • the plurality of magnets 42 are arranged on the radially outer side of the rotor core 41.
  • a plurality of magnets 42 are arranged side by side in the circumferential direction.
  • the rotor core 41 includes eight magnets 42.
  • the plurality of magnets 42 are arranged, but the present invention is not limited to this.
  • a magnet in which N poles and S poles are alternately magnetized in the circumferential direction may be used for a cylindrical magnetic body.
  • the N pole and the S pole are used as a pair of magnetic poles, and a plurality of pairs of magnetic poles are provided.
  • the magnet 42 is fixed to the rotor core 41 by, for example, a resin mold.
  • the method of fixing the magnet 42 is not limited to resin molding, and a method that does not adversely affect the rotation of the rotor 4 such as adhesion, welding, or a mechanical fixing method is employed.
  • the rotating shaft 40 is press-fitted into the first bearing 51 and the second bearing 52 at two locations separated in the axial direction. That is, the rotating shaft 40 is rotatably supported by the first bearing 51 and the second bearing 52 at two different locations in the axial direction.
  • the end of the rotary shaft 40 on the second direction Or side is press-fitted into the inner ring of the second bearing 52.
  • a portion on the first direction Op side is press-fitted into the inner ring of the first bearing 51 with respect to a portion press-fitted into the second bearing 52 of the rotary shaft 40.
  • the first bearing 51 is housed in the first bearing housing member 61.
  • the second bearing 52 is housed in the second bearing housing member 62.
  • the first bearing housing member 61 and the second bearing housing member 62 are fixed to the resin casing 2 directly or indirectly. Accordingly, the rotating shaft 40 is rotatably supported by the resin casing 2 (the stator 1 covered with the resin casing 2) by the pair of bearings 51 and 52.
  • a shaft retaining ring 401 is attached to the rotating shaft 40 on the first direction Op side, and a shaft retaining ring 402 is attached to an end portion on the second direction Or side.
  • the shaft retaining ring 401 is in contact with the first bearing 51.
  • the shaft retaining ring 402 is in contact with the second bearing 52. Note that the shaft retaining ring 401 and the shaft retaining ring 402 are fixed by being fitted into a groove provided on the outer peripheral surface of the rotating shaft 40.
  • the shaft retaining ring 401 is in contact with the inner ring of the first bearing 51 in the second direction Or side.
  • the shaft retaining ring 401 limits the movement of the rotary shaft 40 in the first direction Op relative to the first bearing 51.
  • the shaft retaining ring 402 is in contact with the first direction Op side of the inner ring of the second bearing 52.
  • the shaft retaining ring 402 restricts the movement of the rotating shaft 40 toward the second direction Or with respect to the second bearing 52.
  • the axial movement of the first bearing 51 and the second bearing 52 with respect to the stator 1 is relatively restricted, and the axial movement of the rotating shaft 40 with respect to the stator 1 is restricted.
  • the shaft retaining rings 401 and 402 employ, for example, shaft retaining rings generally called C-ring and E-ring, but are not limited thereto.
  • a configuration that can contact the inner rings of the pair of bearings 51 and 52 and limit the movement of the rotating shaft 40 can be widely employed.
  • the rotating shaft 40 is rotatably supported by two bearings (the 1st bearing 51 and the 2nd bearing 52), it is not limited to this. It may be supported by three or more bearings.
  • first bearing housing member 61 and the second bearing housing member 62 are made of metal such as iron or brass.
  • the first bearing housing member 61 has a cylindrical shape in which the first bearing 51 can be housed.
  • the end portion on the one axial side of the first bearing housing member 61 includes an end surface portion 610 through which the rotary shaft 40 passes in the radial center portion in the axial direction.
  • the end portion on the other axial side of the first bearing housing member 61 includes a flange portion 611 extending outward in the radial direction. At least a part of the flange portion 611 is insert-molded in the resin casing 2.
  • the first bearing housing 61 is fixed to the resin casing 2 by insert molding.
  • the flange portion 611 may be provided with a penetrating portion that penetrates in the axial direction.
  • the through portion is not limited to the hole as long as the rotation can be reliably prevented by the resin, and may be, for example, a concave portion recessed radially inward or a convex portion protruding radially outward.
  • the flange portion 611 itself may be formed in a polygonal shape (for example, a triangle or a quadrangle) or an elliptical shape to prevent rotation.
  • the first bearing housing member 61 is fixed to the resin casing 2 such that the center axis thereof coincides with the center axis Ax of the stator 1 covered with the resin casing 2.
  • the outer ring of the first bearing 51 is press-fitted into the first bearing housing member 61.
  • the first bearing housing member 61 insert-molded in the resin casing 2 penetrates the cover hole 30 of the cover 3 in the axial direction. At this time, the cover 3 and the bearing housing member 61 are not in contact with each other. That is, the cover 3 and the first bearing housing member 61 are electrically insulated.
  • the second bearing housing member 62 holds the second bearing 52.
  • the second bearing housing member 62 includes a housing portion 621 and an outer cylinder portion 620.
  • the storage portion 621 has a cylindrical shape and stores the second bearing 52 therein.
  • the outer ring of the second bearing 52 is press-fitted into the storage portion 621.
  • the outer cylinder part 620 has a larger diameter than the storage part 621, and the end part on the second direction Or side of the resin casing 2 is press-fitted into the outer cylinder part 620. Then, when the resin casing 2 is press-fitted into the second bearing housing member 62, the second bearing 62 is fixed to the stator 1 covered with the resin casing 2.
  • the outer ring of the second bearing 52 is fixed to the stator 1, and the center axis of the second bearing 52 coincides with the center axis Ax of the stator 1.
  • the storage part 621 and the outer cylinder part 620 are formed of the same member.
  • the second bearing housing member 62 is manufactured by drawing a metal plate. However, it is not limited to this.
  • the motor A is a brushless DC motor. Therefore, the motor A includes an inverter circuit (not shown) in the drive circuit.
  • a high frequency high voltage may be induced in the stator core 11. Due to the voltage induced in the stator core 11, a potential difference is generated between the inner ring and the outer ring of the first bearing 51 and the second bearing 52.
  • discharge spark
  • the motor A is a brushless DC motor. Therefore, the motor A includes an inverter circuit (not shown) in the drive circuit.
  • a high frequency high voltage may be induced in the stator core 11. Due to the voltage induced in the stator core 11, a potential difference is generated between the inner ring and the outer ring of the first bearing 51 and the second bearing 52.
  • discharge spark
  • the stator core 11 is electrically connected to the grounding point (reference voltage) of the apparatus in which the motor A is installed using the energizing member 8. Thereby, the voltage of the stator core 11 is lowered, and the occurrence of electrolytic corrosion due to the voltage induced in the stator core 11 is suppressed.
  • the energizing member 8 is conductive. As shown in FIG. 2, the energizing member 8 includes a contact portion 81 and a grounding portion 82. As shown in FIG. 2, the grounding part 82 includes a lead wire and the like, and is electrically connected to a grounding point (frame ground) of a device to which the motor A is attached. In the energization member 8, the contact portion 81 is electrically connected to the ground portion 82. The contact portion 81 is in contact with the stator core 11. That is, the energizing member 8 has a contact portion 81 that contacts the stator core 11 on one side and a grounding portion 82 that is grounded on the other side.
  • the contact portion 81 is in contact with the stator core 11, and the ground portion 82 that is electrically connected to the contact portion 81 is electrically connected to the ground point (frame ground), whereby the potential of the stator core 11 can be lowered. .
  • the contact portion 81 is a screw, and includes a connection portion 811, a top portion 812, and a flat portion 813. That is, the connecting portion 811 is a male screw portion, and the crown portion 812 is a screw head.
  • the connecting portion 811 has a cylindrical shape with a male screw.
  • a top portion 812 is formed of the same member at an end portion on one side (radially outer side in FIG. 2) of the connection portion 811.
  • the surface portion 813 is a surface on the connection portion 811 side of the top portion 812 and is a flat surface.
  • the energization member 8 includes a connection portion 811 and a top portion 812 at one end of the connection portion 811. And the connection part 811 and the top part 812 are formed with the same member.
  • the plane portion 812 is a surface on the connection portion 811 side of the top portion 812 and is a plane.
  • the end of the contact portion 81 opposite to the top portion 812 of the connection portion 811 is the contact portion 81 of the energizing member 8 and the cover 3 covering the outer peripheral surface of the resin casing 2 and the resin casing 2 is radially outward. It penetrates from the inside. Then, the male screw at the tip of the contact portion 81 is attached in mesh with the female screw of the screw hole 110 provided in the stator core 11. Thereby, the connection part 811 and the stator core 11 contact. That is, the other end of the connecting portion 811 is in contact with the stator core 11. The male screw of the connecting portion 811 is also engaged with the female screw of the screw hole 302 of the cover 3 and attached. The energization member 8 is supported by the cover 3.
  • the flat portion 813 comes into contact with the outer peripheral surface of the cover 3. That is, the outer surface of the cover 3 is in contact with the flat surface portion 813 of the top portion 812. Since the energizing member 8 is supported by the cover 3 having higher strength than the resin casing 2, the cover 3 opposes the external force even when an external force is applied to the energizing member 8. For this reason, it is difficult for excessive force to be applied to the resin casing 2, and malfunctions are unlikely to occur.
  • the end portion of the lead wire which is the grounding portion 82 is sandwiched between the flat portion 813 and the outer peripheral surface of the cover 3. Then, the end of the grounding part 82 opposite to the plane part 813 is connected to the grounding point (frame ground) of the device to which the motor A is attached. Thereby, the potential of the stator core 11 can be lowered.
  • the grounding part 82 may be connected to an earth provided separately from the frame ground.
  • the first bearing housing member 61 and the cover 3 are electrically insulated.
  • the second bearing housing member 62 and the cover 3 are electrically insulated. That is, the cover 3 and the bearing housing members (61, 62) are electrically insulated. Therefore, the first bearing housing member 61 and the second bearing housing member are electrically insulated from the energization member 8. That is, the bearings (51, 52) and the energizing member 8 are electrically insulated.
  • the cover 3 and the bearing housing member (61, 62) are insulated from each other to insulate the bearing from the current-carrying member.
  • the present invention is not limited to this.
  • the bearing and the bearing housing member may be insulated. In addition to these, a method of electrically insulating the bearing and the energizing member can be widely employed.
  • connection part 811 is screwed in the screw hole 110 of the stator core 11, if the connection part 811 and the stator core 11 electrically conduct, it does not need to be screwed.
  • the contact portion 81 of the energizing member 8 the connection portion 811 is provided with a male screw, and a screw having a head portion 812 which is a screw head formed of the same member as the male screw is described as an example. It is not limited.
  • a contact part the structure which contacts the stator core 11 and can contact the outer peripheral surface of the cover 3, such as a rivet and a split pin, can be widely used.
  • the tip of the lead wire included in the grounding portion 82 may be inserted into a hole provided in the resin casing 2 and the cover 3 and adhered to the stator core 11 with a conductive adhesive to form the contact portion 81.
  • the contact portion 81 can widely employ a configuration that can electrically connect the grounding portion 82 and the stator core 11.
  • the motor A includes a bearing-side intrusion preventing member 71 and a shaft-side intrusion preventing member 72 for suppressing entry of foreign matter from the first bearing housing member 61.
  • the bearing-side intrusion preventing member 71 covers the outer surface of the first bearing housing member 61. And it surrounds the outer side of the rotating shaft 40, and is extended to radial direction.
  • the bearing-side intrusion preventing member 71 is made of, for example, a material such as rubber, and is in close contact with the first bearing housing member 61. Further, the bearing-side intrusion preventing member 71 is attached with a gap between the bearing 40 and the rotating shaft 40, that is, while maintaining non-contact.
  • the shaft side intrusion preventing member 72 is disposed so as to surround the radially outer side of the bearing side intrusion preventing member 71.
  • the shaft side intrusion preventing member 72 is disposed in the groove 400 provided in the rotating shaft 40. Thereby, the movement of the shaft side intrusion preventing member 72 in the axial direction is limited.
  • the bearing-side intrusion preventing member 71 and the shaft-side intrusion preventing member 72 are attached to the motor A at the same time, thereby suppressing the entry of foreign matter into the motor A.
  • the casing contact portion 31 of the cover 3 is also provided in the recessed hole 21, but the shaft side intrusion prevention member 72 is fixed to the rotating shaft 40 in a non-contact state with the casing contact portion 31. That is, a part of the opening of the shaft side intrusion preventing member 72 is disposed in the recessed hole 21. And since the casing contact part 31 and the shaft side penetration
  • a substrate Bd and a protective sheet Is are provided on the resin casing 2 on the second direction Or side of the stator 1.
  • a control circuit (not shown) for controlling the timing of the current supplied to the plurality of windings 13, the magnitude of the current, and the like is mounted.
  • the control circuit may be provided outside the motor A, and in that case, the substrate Bd may be omitted.
  • the protective sheet Is is an insulating member disposed between the substrate Bd and the second bearing housing member 62. It is provided to prevent a short circuit between the second bearing housing member 62 and the substrate Bd. In the case of a motor that does not include the substrate Bd, the protective sheet Is may be omitted.
  • the cover 3 is mainly made of a metal material and has a smaller linear expansion coefficient than the resin casing 2. Thereby, the difference of the deformation
  • the resin casing 2 and the cover 3 are press-fitted in the press-fit portion 22 of the resin casing 2. Therefore, since the heat of the resin casing 2 is transmitted to the cover 3 and radiated, the thermal expansion of the resin casing 2 is suppressed in the press-fit portion 22.
  • the insulator 12 is sealed with the resin casing 2 at a portion shifted in the axial direction from the press-fit portion 22.
  • the insulator 12 is resin, and the linear expansion coefficient of the insulator 12 is larger than that of the stator core 11. Therefore, the portion of the resin casing 2 that does not overlap the stator core 11 in the radial direction is more deformed outwardly in the radial direction due to thermal expansion than the press-fit portion 22 that overlaps the stator core 11 in the radial direction.
  • the heat dissipation is inferior to the press-fit portion 22. Therefore, problems such as distortion and displacement of the resin casing 2 due to a difference in deformation amount due to thermal expansion between the insulator 12 and the cover 3 occur.
  • a gap is provided in a portion where a difference in deformation amount due to heat between the resin casing 2 and the cover 3 becomes large.
  • the clearance gap between the resin casing 2 and the cover 3 can be easily formed by forming the recessed part 23 in the resin casing 2.
  • a portion of the resin casing 2 provided with the recess 23, that is, a portion overlapping the recess 23 in the radial direction in FIG. 2 is a thin-walled portion 24 thinner than the other portions of the resin casing 2. As described above, by providing the thin portion 24, it is easy to discharge heat generated when a current flows through the crossover portion 131 to the outside of the resin casing 2.
  • the current-carrying member 8 that is in contact with the cover 3 is grounded to a ground point (frame ground).
  • the ground point (frame ground) is a reference voltage of the apparatus, and may vary due to the influence of driving of the motor A, a power supply circuit (not shown) or the like, for example. If the outer rings of the first bearing 51 and the second bearing 52 are connected to a grounding point where the reference voltage varies, there is a risk of causing electrolytic corrosion depending on conditions. Therefore, in the motor A, the first bearing housing member 61 electrically connected to the outer ring of the first bearing 51 and the second bearing housing member 62 electrically connected to the outer ring of the second bearing 52 are insulated from the cover 3. To do.
  • the first bearing 51 and the second bearing 52 are prevented from being connected to the grounding point (frame ground), and electrolytic corrosion caused by variations in the reference voltage is suppressed.
  • the voltage of the stator core 11 is connected to the ground point (frame ground), so that the voltage is reduced to the reference voltage. Thereby, the electric corrosion which generate
  • the first bearing 51 and the second bearing 52 can rotate with high accuracy over a long period of time. Thereby, the stable operation
  • FIG. 6 is a partial cross-sectional view showing a resin casing and a cover of a modified example of the motor according to the present embodiment.
  • the motor A1 shown in FIG. 6 has the same configuration as the motor A shown in FIG. 2 except that the resin casing 2a1 and the cover 3a1 are different. Therefore, substantially the same parts are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the outer peripheral surface of the resin casing 2a1 gradually decreases in diameter toward the back side in the press-fitting direction, that is, toward the first direction Op side in FIG. That is, the outer peripheral surface of the resin casing 2a1 is an inclined surface (tapered surface) having a small diameter on the back side in the press-fitting direction.
  • the cover 3a1 has a shape into which the resin casing 2a1 can be inserted.
  • the cover 3a1 has a cylindrical shape and gradually becomes smaller in diameter toward at least the back side of the inner peripheral surface in the press-fitting direction, that is, the first direction Op side in FIG. That is, the inner diameter of the cover 3a1 gradually decreases toward the press-fitting direction of the resin casing 2a1.
  • the insertion becomes easy.
  • the press-fitting portion 221 is an inclined surface, the deformation amount of the resin casing 2a1 during press-fitting can be reduced. Thereby, generation
  • FIG. 7 is a partial cross-sectional view showing a resin casing and a cover of another modified example of the motor according to the present embodiment.
  • the motor A2 shown in FIG. 7 has the same configuration as the motor A shown in FIG. 2 except that the resin casing 2a2 and the cover 3a2 are different. Therefore, substantially the same parts are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the outer peripheral surface of the resin casing 2a2 gradually decreases in diameter toward the inner side in the press-fitting direction, that is, toward the first direction Op in FIG. That is, the outer peripheral surface of the resin casing 2a2 has a plurality of different outer shapes.
  • inner side of a press injection direction is a small diameter, and a level
  • the cover 3a2 has a shape into which the resin casing 2a2 can be inserted.
  • the cover 3a2 has a cylindrical shape, and at least the back side in the press-fitting direction of the inner peripheral surface, that is, the first direction Op side in FIG. That is, the inner diameter of the cover 3a2 decreases stepwise toward the press-fitting direction of the resin casing 2a2.
  • Insertion becomes easy by providing the shape of the resin casing 2a2 and the cover 3a2. Further, the step of the resin casing 2a2 and the step of the cover 3a2 can be brought into contact with each other so as to be positioned when the resin casing 2a2 is inserted into the cover 3a2. Further, the press-fitting portion 222 of the resin casing 2a2 comes into contact with the portion into which the cover 3a2 is press-fitted and press-fitting is started. Thereby, the force which acts by press fit can be reduced. The amount of deformation of the resin casing 2a2 during press fitting can be reduced. Thereby, generation
  • FIG. 8 is an exploded perspective view of another example of the motor according to the present invention.
  • FIG. 9 is a cross-sectional view of the motor shown in FIG.
  • the resin casing 2 b of the motor B is provided with a step portion 25 extending radially outward on the second direction Or side.
  • a plurality (four in this case) of stepped portions 25 are provided in the resin casing 2b.
  • the resin casing 2b is located in the same position in the axial direction, and is located in the circumferential direction at equal intervals.
  • the cover 3b is provided with the contact part 311 which protruded outside from the outer peripheral surface.
  • the contact portion 311 comes into contact with the step portion 25 when the resin casing 2b is press-fitted into the cover 3b.
  • the contact portion 311 contacts the surface of the step portion 25 in the press-fitting direction (the first direction Op side in FIG. 9).
  • This step portion 25 is a mounting convex portion for mounting the motor B to the device. Therefore, a fixing tool such as a screw penetrates the step portion 25. And the contact part 311 which contacts the step part 25 formed with the same member as the resin casing 2b is formed with the same member as the cover 3b whose strength is higher than that of the resin casing 2b. Thereby, the motor B can be firmly fixed. Further, even if vibration, impact, or the like acts, the motor B is difficult to drop off. Note that the number and position of the stepped portions 25 are not limited to those described above, and are changed depending on the shape and position of an attachment location (not shown) of the device to which the motor B is attached.
  • the cover 3b is electrically insulated from the first bearing housing member 61 and the second bearing housing member 62. Then, the stator core 11 is electrically connected to the ground point (frame ground) by the energizing member 8, and the potential of the stator core 11 is lowered. Thereby, generation
  • the contact part 311 may contact the apparatus to which the motor A is attached. And when the part which contacts the contact part 311 of an apparatus is the same potential as a grounding point (frame ground), the energizing member 8 becomes the same voltage as the grounding point (frame ground) through the cover 3, that is, Connected to ground point. At this time, the grounding portion 82 of the energizing member 8 may be omitted.
  • FIG. 10 is a cross-sectional view of still another example of the motor according to the present invention.
  • the stator 1c and the resin casing 2c are different, but the other parts are the same as the motor A of the first embodiment. Therefore, substantially the same parts as those of the motor A having the configuration of the motor C are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the stator 1 c of the motor C includes an insulator core back portion 122 at the end of the insulator 12 on the first direction Op side. And the insulator core back part 122 is provided with the wiring part 120c by which the crossover part 131 is arrange
  • a gap Gp is provided between the recess 23c and the cover 3c overlapping in the axial direction.
  • the press-fit portion 22 of the resin casing 2c is provided on the outer peripheral surface. Therefore, when the resin casing 2c is press-fitted into the cover 3c, a force during press-fitting acts on the outer peripheral surface of the resin casing 2c.
  • the recess 23c is provided at the end on the first direction Op side in the axial direction, so that the force during press-fitting is less likely to concentrate on the recess 23c. Thereby, the shift
  • FIG. 11 is an exploded perspective view of still another example of the motor according to the present invention.
  • 12 is a cross-sectional view of the motor shown in FIG.
  • the motor D of the present embodiment has the same configuration as the motor A of the first embodiment, except for the cover, the first bearing housing member 61d, the second bearing housing member 62d, and the bearing side intrusion prevention member 71d. Therefore, in the configuration of the motor D, parts that are substantially the same as the configuration of the motor A are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the cover of the motor D includes a first cover member 3da and a second cover member 3db. That is, the cover covers the resin casing 2 from one side in the axial direction (first direction Op side) and the second cover covers the resin casing 2 from the other side in the axial direction (second direction Or side). Cover member 3db.
  • the first direction Op of the resin casing 2 is press-fitted into the first cover member 3da.
  • the second direction Or side of the resin casing 2 is inserted into the second cover member 3db.
  • the resin casing 2 is press-fitted into the first cover member 3da on the first direction Op side, but is not limited thereto.
  • the second direction Or side of the resin casing 2 may be press-fitted into the second cover member 3db. Moreover, both may be press-fitted. Which of the first cover member 3da and the second cover member 3db is to be press-fitted with the resin casing 2 is determined by the position of the press-fitting portion 22 of the resin casing 2.
  • the first cover member 3da has a bottomed cylindrical shape in which at least a part of the end portion on the first direction Op side is closed.
  • the first cover member 3da includes a first flange 32 that extends outward in the radial direction at an end portion on the second direction Or side. That is, the first cover member 3da has a first flange 32 that extends radially outward from the outer peripheral surface.
  • the first flange 32 is a quadrangle (for example, a square) when viewed in the axial direction.
  • the shape which can be attached to the attachment location of the apparatus (not shown) to which the motor D is attached is employ
  • the radial center of the bottom portion of the first cover member 3da and the first bearing housing member 61d are formed of the same member. That is, the cover (first cover member 3da) and the bearing housing member (first bearing housing member 61d) are formed of the same member.
  • the first bearing housing member 61d and the bearing side intrusion preventing member 71d are formed of the same member. That is, the first cover member 3da, the first bearing housing member 61d, and the bearing side intrusion preventing member 71d are formed of the same member. That is, the first bearing housing member 61d protrudes from the bottom of the first cover member 3da toward the first direction Op.
  • invasion prevention member 71d protrudes from the radial direction center part of the end surface part 610d of the 1st bearing storage member 61d at the 1st direction Op side to the 1st direction Op side.
  • the bearing-side intrusion preventing member 71d is formed of the same member as the first bearing housing member 61d, that is, a metal.
  • the first bearing housing member 61d is formed of the same member as the first cover member 3da, but plays the same role as the first bearing housing member 61 of the motor A in that the first bearing 51 is housed therein.
  • the bearing-side intrusion preventing member 71d is also made of a different material, but the use of the shaft-side intrusion preventing member 72 in combination with the shaft-side intrusion preventing member 72 prevents the entry of foreign matter such as water, dust, dust, etc. It plays the same role as the member 71.
  • connection portion 811 of the energizing member 8 passes through the outer peripheral surface of the first cover member 3da. Then, the connection portion 811 of the energization member 8 penetrates the insulating member 303. At this time, the connection portion 811 and the first cover member 3da are non-contact, that is, electrically insulated.
  • the second cover member 3db is a cylindrical member extending in the axial direction.
  • the second cover member 3db and the second bearing housing member 62d are formed of the same member.
  • the second bearing housing member 62d is continuously formed at the end of the second cover member 3db on the second direction Or side. That is, the cover (second cover member 3db) and the bearing housing member (second bearing housing member 62d) are formed of the same member.
  • the second cover member 3db includes a second flange 33 that extends radially outward at an end on the first direction Op side. That is, the second cover member 3db has a second flange 33 that extends radially outward from the outer peripheral surface.
  • the second flange 33 is a quadrangle (for example, a square) when viewed in the axial direction.
  • the second flange 33 has a shape overlapping the first flange 32 in the axial direction.
  • the second bearing housing member 62d includes a second bearing housing member 62 used in the motor A, except that a portion corresponding to the outer cylindrical portion 620 of the second bearing housing member 62 of the motor A is continuous with the same member as the second cover member 3db. Have the same configuration. That is, the second bearing housing member 62 d includes a housing portion 621 d that houses the second bearing 52.
  • the resin casing 2 is inserted into the first cover member 3da from the first direction Op side, and the press-fit portion 22 is press-fitted into the first cover member 3da.
  • the second cover member 3db only covers the resin casing 2 and is not press-fitted. Therefore, the second cover member 3db into which the portion of the resin casing 2 on the second direction Or side is inserted may be able to rotate around the central axis Ax. Therefore, a protrusion 330 that protrudes toward the first direction Op is provided on the end surface of the second flange 33 on the first direction Op side.
  • the protrusion 330 is inserted into a positioning hole 320 provided in the first flange 32.
  • the first flange 32 and the second flange 33 fix the first cover member 3da and the second cover member 3db to each other. Therefore, the first flange 32 and the second flange 33 are provided with screw fixing holes through which a fixing tool (here, a screw) passes. Then, the first cover member 3da and the second cover member 3db are fixed to each other by fixing the first flange 32 and the second flange 33 to each other. That is, when the first cover member 3da and the second cover member 3db cover the resin casing 2, the first flange 32 and the second flange 33 are connected directly or indirectly.
  • a fixing tool here, a screw
  • the resin casing 2 is press-fitted into the first cover member 3da, and the second cover member 3db is fixed to the first flange 32 of the first cover member 3da via the second flange 33. Therefore, the relative positions of the stator 1 covered with the resin casing 2 and the first bearing 51 and the second bearing 52 are determined.
  • the rotating shaft 40 is rotatably supported by the first bearing 51 and the second bearing 52.
  • the rotary shaft 40 is supported by the first bearing member 3da into which the resin casing 2 is press-fitted and the first bearing 51 and the second bearing 52 attached to the covering second cover member 3db.
  • the rotor 4 is supported in a rotatable manner in the stator 1 while having a constant interval in the radial direction.
  • first bearing housing member 61d is formed of the same member as the conductive first cover member 3da
  • second bearing storage member 62d is formed of the same member as the conductive second cover member 3db. Yes.
  • the first cover member 3da and the second cover member 3db are in contact with each other. Thereby, the first bearing housing member 61d and the second bearing housing member 62d are in an electrically conductive state.
  • the first cover member 3da is a part of the first bearing housing member 61d
  • the second cover member 3db is a part of the second bearing housing member 62d. In the motor D, the first cover member 3da and the second cover member 3db are in direct contact.
  • the first cover member 3da and the second cover member 3db are in direct contact.
  • the first cover member 3da and the energization member 8 are electrically insulated.
  • 2nd cover member 3db and the electricity supply member 8 are electrically insulated.
  • the cover (the first cover member 3da and the second cover member 3db) and the energizing member 8 are electrically insulated.
  • the insulating member 303 penetrates the energizing member 8 of the first cover member 3da.
  • At least the first cover member 3da may be formed of an insulating material such as an insulating ceramic.
  • the 1st bearing 51 and the 2nd bearing 52, and the electricity supply member 8 can be electrically insulated, without providing the insulating member 303.
  • FIG. Thereby, it is suppressed that the outer ring of the 1st bearing 51 and the outer ring of the 2nd bearing 52 are connected to a grounding point (frame ground). That is, the cover may have insulating properties.
  • FIG. 13 is a cross-sectional view of a modified example of the motor according to the present embodiment.
  • the motor D1 shown in FIG. 13 has the same configuration as the motor D shown in FIGS. 11 and 12, except that the first cover member 3da1 and the second cover member 3db1 are different. Therefore, substantially the same parts are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the resin casing 2 and the first bearing housing member 61 have the same configuration as the motor A of the first embodiment. That is, the first bearing housing member 61 is disposed in the resin casing hole 20 of the resin casing 2, and the flange portion 611 is insert-molded in the resin casing 2. And 1st cover member 3da1 is provided with the cover hole 30 in the edge part by the side of the 1st direction Op, and the casing contact part 31 presses the concave hole 21 of the resin casing 2. As shown in FIG. That is, the first cover member 3da1 and the first bearing housing member 61 are formed of different members. The first bearing storage member 61 passes through the cover hole 30. At this time, a gap is formed between the inner peripheral portion of the cover hole 30 and the first bearing housing member 61. Thereby, the first cover member 3da1 and the first bearing 51 are electrically insulated.
  • the second cover member 3db1 and the second bearing housing member 62 are separate bodies. That is, the second cover member 3db1 separates the end portion on the second direction Or side from the end portion on the first direction Op side of the outer cylinder 620 of the second bearing housing member 62. Thereby, 2nd cover member 3db1 and the 2nd bearing storage member 62 are electrically insulated.
  • the first cover member 3da1 supports the energization member 8.
  • the first cover member 3da1 and the first bearing housing member 61 are insulated, and the second cover member 3db1 and the second bearing housing member 62 are insulated.
  • the energizing member 8 is supported by the first cover member 3da1, and the stator core 11 is connected to the grounding point (frame ground) via the energizing member 8.
  • FIG. 14 is a cross-sectional view of still another example of the motor according to the present invention.
  • the motor E of the present embodiment has the same configuration as the motor D of the fourth embodiment, except that the resin casing 2e, the first cover member 3ea, and the second cover member 3eb are different. Therefore, in the configuration of the motor E, substantially the same parts as those of the motor D are denoted by the same reference numerals, and detailed description of the same parts is omitted.
  • the first bearing 51 is housed in the first bearing housing member 61 having the same configuration as the motor A.
  • the resin casing 2e of the motor E includes a step portion 25e that protrudes radially outward from a portion closer to the second direction Or than the press-fitting portion 22 on the outer peripheral surface.
  • the step portion 25e has a similar shape and is provided for the same purpose, although the position in the axial direction is different from that of the step portion 25 provided in the motor B shown in FIGS. That is, four step portions 25e are provided in the resin casing 2e, and are arranged at equal intervals in the circumferential direction.
  • the first bearing housing member 61 is fixed to the end of the resin casing 2e on the first direction Op side. The first bearing housing member 61 is fixed in the same manner as the resin casing 2 of the motor A, and details thereof are omitted.
  • the first cover member 3ea has a bottomed cylindrical shape with the end on the first direction Op side closed. And the cover part 30 and the casing contact part 31 are provided in the bottom part similarly to the cover 3.
  • the first cover member 3ea includes a first flange 32 having the same configuration as the first cover member 3da.
  • the second cover member 3eb is a cylindrical member extending in the axial direction.
  • the second cover member 3eb and the second bearing housing member 62 are formed of different members.
  • the end portion on the second direction Or side of the second cover member 3eb and the end portion on the first direction Op side of the outer cylinder 620 of the second bearing housing member 62 are separated in the axial direction.
  • the 2nd cover member 3eb and the 2nd bearing storage member 62 are electrically insulated.
  • the second cover member 3eb includes a second flange 33e extending outward in the radial direction and an abutting portion 35e at the end on the first direction Op side.
  • the second flange 33e is provided at a position in contact with the first flange 32 of the first cover member 3ea when the second cover member 3eb is covered from the second direction Or side of the resin casing 2e.
  • the contact portion 35e is provided at a position where it comes into contact with the end surface of the step portion 25e on the second direction Or side when the second cover member 3eb is covered from the second direction Or side of the resin casing 2e.
  • the second flange 33e is provided closer to the first direction Op than the contact portion 35e. And the 2nd flange 33e and the contact part 35e are alternately arrange
  • the first flange 32 comes into contact with the end surface of the step portion 25e on the first direction Op side.
  • the second cover member 3eb covers the second direction Or side of the resin casing 2e.
  • the contact portion 35e of the second cover member 3eb is in contact with the end surface on the second direction Or side of the step portion 25e of the resin casing 2e, and the second flange 33e is in contact with the first flange 32.
  • the resin casing 2e includes the step portion 25e, positioning in the axial direction during press-fitting into the first cover member 3ea is facilitated. Similarly, the axial positioning of the second cover member 3eb with respect to the resin casing 2e is facilitated. Further, the first cover member 3ea and the first bearing housing member 61 are electrically insulated. The second cover member 3eb and the second bearing housing member 62 are electrically insulated. Thereby, even when the conducting member 8 supported by the first cover member 3ea connects the stator core 11 to the grounding point (frame ground), the first bearing housing member 61 and the second bearing housing member 62 are connected to the grounding point (frame ground). ) Is not connected.
  • the first bearing 51 and the second bearing 52 are prevented from being connected to the grounding point (frame ground), and electrolytic corrosion caused by variations in the reference voltage is suppressed.
  • the voltage of the stator core 11 is connected to the ground point (frame ground), so that the voltage is reduced to the reference voltage. Thereby, the electric corrosion which generate
  • the present invention can be used as a motor for driving a blower fan such as an air conditioner or a fan.
  • Shaft Support member 400 ... groove, 401 ... shaft retaining ring, 402 ... shaft retaining ring, 42 ... magnet, 43 ... mold part, 51 ... first bearing, 52 ... 2nd bearing, 61 ... 1st bearing housing member, 610 ... End surface, 611 ... Bearing flange, 6 ... 2nd bearing housing member, 620 ... outer cylinder part, 621 ... housing part, 71 ... bearing side intrusion preventing member, 72 ... shaft side intrusion preventing member, 8 ... energizing member 81 ... contact part, 811 ... connection part, 812 ... top part, 813 ... flat part, 82 ... grounding part, Bd ... substrate, Is ... protective sheet

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Selon la présente invention, ce moteur est pourvu : d'un rotor; d'un stator ; d'un boîtier en résine qui scelle au moins un isolant et un enroulement du stator ; une pluralité de paliers qui portent en rotation un arbre rotatif à des positions séparées l'une de l'autre dans la direction axiale ; un couvercle qui recouvre la surface circonférentielle externe du boîtier en résine ; et un élément conducteur ayant une conductivité. Le stator est pourvu d'une pluralité d'éléments de logement de palier dans lesquels la pluralité de paliers sont logés, respectivement. L'élément conducteur est soutenu par le couvercle. L'élément conducteur comporte, sur de ses côtés, une partie de contact qui est en contact avec le noyau de stator, et sur un autre de ses côtés, une partie mise à la terre qui est mise à la terre, et les paliers et l'élément conducteur sont isolés électriquement.
PCT/JP2018/003656 2017-03-31 2018-02-02 Moteur WO2018179832A1 (fr)

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US12040678B2 (en) 2019-07-26 2024-07-16 Guangdong Welling Motor Manufacturing Co., Ltd. Brushless motor and electrical equipment
JP7665035B2 (ja) 2021-09-28 2025-04-18 三菱電機株式会社 電動機、送風機および換気扇

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KR102718236B1 (ko) * 2020-02-17 2024-10-17 광둥 미디어 화이트 홈 어플라이언스 테크놀로지 이노베이션 센터 컴퍼니 리미티드 모터와 전기 기구
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CN112366879A (zh) * 2019-07-26 2021-02-12 广东威灵电机制造有限公司 无刷电机及电器设备
CN112366879B (zh) * 2019-07-26 2022-02-18 广东威灵电机制造有限公司 无刷电机及电器设备
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JP7665035B2 (ja) 2021-09-28 2025-04-18 三菱電機株式会社 電動機、送風機および換気扇

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