JP2015106966A - Rotor and permanent magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor and a permanent magnet motor that are able to hold a presser plate and a cushioning member in the axial direction thereof without a rivet.SOLUTION: A rotor 1 comprises: a permanent magnet 1 in which plate-like permanent magnetic pieces 21 are arranged in an annular form; an annular outer-peripheral-side iron core 3 located on the inside diameter side of the permanent magnet 2; a cushioning member 4 located on the inside diameter side of the outer-peripheral-side iron core 3; an inner-peripheral-side iron core 5 covered with the cushioning member 4; a shaft 6 fixed to the inner-periphery-side iron core 5; and an end plate 7 for holding the outer-periphery-side iron core 5 and the cushioning member 4 in the axial direction thereof. The rotor 1 has a resin part 8 that fixes the permanent magnetic pieces 21 to the outer-periphery-side iron core 3 and also fixes the end plate 7 in the axial direction. A permanent magnet motor M includes the rotor 1, and a stator arranged opposite to the outer periphery side of the rotor 1 with a predetermined distance between them.

Description

  The present invention relates to a rotor and a permanent magnet electric motor using the rotor.

  A conventional permanent magnet motor has an inner rotor type motor in which a rotor having a permanent magnet is rotatably arranged inside a stator that generates a rotating magnetic field. For example, a blower fan mounted on an air conditioner is provided. Used as a brushless DC motor for rotational driving.

  The rotor of such a permanent magnet motor includes, for example, a cylindrical permanent magnet disposed on the outer peripheral side, a rotor core fixed to the shaft, and a buffer fitted between the permanent magnet and the rotor core. And a member. This rotor has a structure in which a buffer member is pressed by a pressing plate from the axial direction, and the pressing plate and the buffer member are fixed by rivets. Due to the structure of this rotor, vibration due to rotation of the permanent magnet is known to be absorbed by the buffer member and not transmitted from the permanent magnet to the rotor iron core or shaft, thereby obtaining a vibration isolation effect of the rotor (for example, , See Patent Document 1).

  However, the vibration isolating structure of the rotor according to Patent Document 1 requires a rivet for holding the pressing plate and the buffer member in the axial direction, and there is a problem that the number of parts increases.

Japanese Patent No. 3689877

  In view of the above problems, an object of the present invention is to provide a rotor and a permanent magnet motor that can hold the pressing plate and the buffer member in the axial direction without a rivet.

  In order to solve the above problems, the rotor of the present invention includes a permanent magnet in which plate-like permanent magnet pieces are arranged in an annular shape, an annular outer peripheral core positioned on the inner diameter side of the permanent magnet, and an inner diameter of the outer peripheral core. A buffer member positioned on the side, an inner peripheral iron core covered with the buffer member, a shaft fixed to the inner peripheral iron core, and an end plate for holding the outer peripheral core and the buffer member in the axial direction. It is provided, It has a resin part which fixes an end plate to an axial direction while fixing a permanent magnet piece to an outer peripheral side iron core, It is characterized by the above-mentioned. The permanent magnet motor according to the present invention includes the rotor and a stator arranged to face the outer peripheral side of the rotor at a predetermined interval.

  Further, in the rotor of the present invention, the outer peripheral side iron core has a through hole penetrating in the axial direction, the end plate has an opening portion penetrating in the axial direction, and the through hole and the opening portion are communicated with each other to form the resin portion. Is formed.

  In the rotor according to the present invention, the outer peripheral side iron core has a protruding portion extending toward the inner diameter side, and a through hole is provided in the protruding portion.

  According to the rotor and the permanent magnet motor of the present invention, the permanent magnet piece is fixed to the outer peripheral side iron core, and has the resin portion that fixes the end plate in the axial direction. Can be held in the axial direction.

  According to the rotor of the present invention, since the outer peripheral side iron core and the end plate are connected by the resin portion through the through hole and the opening, the holding force in the axial direction of the end plate can be enhanced.

  According to the rotor of the present invention, the outer peripheral iron core has the protruding portion extending toward the inner diameter side, and the through hole is provided in the protruding portion, so that the through hole does not interfere with the magnetic path of the permanent magnet. it can.

It is an external appearance perspective view which shows the rotor by this invention. It is explanatory drawing which shows the rotor by this invention, (a) is a top view, (b) is a side view. It is sectional drawing shown in FIG. 2 of the rotor by this invention, (a) is AA sectional drawing, (b) is BB sectional drawing. It is sectional drawing which shows the permanent magnet electric motor using the rotor by this invention. It is a top view which shows the permanent magnet electric motor using the rotor by this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 to FIG. 5 are diagrams for explaining a rotor and a permanent magnet motor using the rotor in the present embodiment. The permanent magnet motor is an inner rotor type motor in which a rotor having a permanent magnet is rotatably arranged in a stator that generates a rotating magnetic field. For example, the permanent magnet motor is used for rotationally driving a blower fan mounted on an air conditioner. Used as a brushless DC motor.

  As shown in FIGS. 1, 2, and 3, the rotor 1 includes a permanent magnet 2 in which plate-like permanent magnet pieces 21 are arranged in an annular shape, and an annular outer peripheral iron core positioned on the inner diameter side of the permanent magnet 2. 3, a buffer member 4 positioned on the inner diameter side of the outer peripheral side iron core 3, an inner peripheral side iron core 5 covered with the buffer member 4, a shaft 6 fixed to the inner peripheral side iron core 5, and the outer peripheral side iron core 3 A rotor set including an end plate 7 for holding the buffer member 4 in the axial direction is provided. Furthermore, the rotor 1 includes a resin portion 8 that fixes the permanent magnet piece 21 to the outer peripheral iron core 3 and holds the position of the end plate 7 in the axial direction, which is a characteristic part of the present invention.

  The outer peripheral side iron core 3 includes a plurality of first protrusions 31 (protrusions) extending on the inner diameter side on the inner periphery thereof. In the present embodiment, the first protrusion 31 has a first through hole 311 (through hole) penetrating in the axial direction. The inner peripheral iron core 5 is formed in a columnar shape and is disposed on the inner diameter side of the outer peripheral iron core 3. The inner peripheral iron core 5 includes a plurality of second projecting portions 51 extending on the outer diameter side on the outer periphery, and the second projecting portions 51 are arranged so as to be adjacent to the first projecting portion 31 in the circumferential direction. .

  The buffer member 4 is made of a material such as rubber or elastomer, and is disposed between the outer peripheral iron core 3 and the inner peripheral iron core 5 and is formed in a cylindrical shape so as to cover the inner peripheral iron core 5. In the present embodiment, the buffer member 4 includes an upper buffer member 41 and a lower buffer member 42, and the upper buffer member 41 and the lower buffer member 42 are arranged on the inner peripheral side from one side and the other side in the axial direction. It is provided so as to cover the iron core 5.

  Each of the upper buffer member 41 and the lower buffer member 42 has a first recess 43 into which the second protrusion 51 of the inner peripheral iron core 5 is fitted on the inner diameter side, and a first protrusion 31 of the outer iron core 3 on the outer diameter side. And a second recess 44 into which is inserted. The first recesses 43 and the second recesses 44 are alternately formed in the circumferential direction. Since the first protrusion 31 of the outer peripheral core 3 and the second protrusion 51 of the inner peripheral core 5 are fitted in the first recess 43 and the second recess 44 of the buffer member 4, the permanent magnet 2 is connected to the shaft 6. However, the rotational torque of the permanent magnet 2 is reliably transmitted to the shaft 6 without idling (idling). The buffer member 4 includes an upper buffer member 41 and a lower buffer member 42. However, the present invention is not limited to this embodiment, and the buffer member 4 is integrated with the inner peripheral iron core 5 in advance as long as the buffer member 4 has the shape described above. You may shape | mold.

  The permanent magnet 2 includes, for example, a plurality of permanent magnet pieces 21 obtained by sintering magnet powder. The permanent magnet piece 21 is longer than the outer peripheral side iron core 3 in the axial direction, and is disposed on the outer peripheral surface 32 of the outer peripheral side iron core 3 so as to protrude upward from the outer peripheral side iron core 3. The permanent magnet piece 21 is magnetized after the rotor 1 is assembled.

  The end plate 7 is formed in a disc shape, and an opening (first opening 711) into which the shaft 6 can be inserted is formed at the center. The end plate 7 has both end surfaces (upper end surface 33 and lower end surface 34) in the axial direction of the outer peripheral side iron core 3 and both end surfaces in the axial direction of the buffer member 4 (outer upper surface 413 of the upper buffer member 41 and lower buffer member 42). The outer lower surface 423) is disposed so as to be sandwiched from one side and the other side in the axial direction. The end plate 7 further has a second opening 712 (opening) communicating with the first through hole 311 at a location corresponding to the first through hole 311.

  The resin portion 8 is formed between the permanent magnet pieces 21 adjacent to each other in the circumferential direction, the upper end surface 211 and the lower end surface 212 in the axial direction of the permanent magnet piece 21, and the inner peripheral surface of the permanent magnet piece 21 protruding from the outer peripheral iron core 3. 213 and the outer peripheral side end surface 72 of the end plate 7 are formed. The resin portion 8 is formed, for example, by injecting mold resin into a rotor set that is sandwiched by a die (not shown) on the inner diameter side of the end plate 7. The resin portion 8 thus formed fixes the permanent magnet piece 21 to the outer peripheral side iron core 3 and fixes the end plate 7 in a state where the outer peripheral side iron core 3 and the buffer member 4 are sandwiched. In addition, when the 1st through-hole 311 and the 2nd opening part 712 are connected, since the mold resin flows also into the space formed by the 1st through-hole 311 and the 2nd opening part 712, the end plate 7 is stronger. Fixed to. If the end plate 7 is sufficiently fixed, the first through hole 311 may not be provided. In the rotor 1 configured as described above, vibration due to the rotation of the permanent magnet 2 is absorbed by the buffer member 4 and is not transmitted from the permanent magnet 2 to the inner peripheral iron core 5 or the shaft 6, so that the vibration isolation of the rotor 1 is performed. An effect is obtained.

  As shown in FIGS. 4 and 5, the permanent magnet motor M includes the rotor 1 and the stator 9 described above. The stator 9 includes a stator core 91, an insulator 92, and a stator winding 93. The stator core 91 is formed in a cylindrical shape by laminating a plurality of thin steel plates, and includes an annular back yoke portion 911 and a plurality of teeth portions 912 extending from the back yoke portion 911 to the inner diameter side. An insulator 92 is integrally formed on the stator core 91, and a stator winding 93 is wound around the teeth portion 912 via the insulator 92.

  The stator 9 configured as described above is formed by molding resin with a stator core 91 around which the stator winding 93 is wound, except for the tip end surface 9121 of the teeth portion 912 (inner peripheral surface of the stator core 91). A cylindrical outer shell 94 is formed by molding, and the tip end surface 9121 of the tooth portion 912 is disposed so as to face the outer peripheral side of the rotor 1 with a predetermined interval (so-called air gap).

  According to the rotor 1 and the permanent magnet motor M using the rotor 1 according to the embodiments described above, the permanent magnet piece 21 is fixed to the outer peripheral side iron core 3 and the end plate 7 is fixed in the axial direction. By having the portion 8, the end plate 7 and the buffer member 5 can be held in the axial direction even without a rivet, as in the conventional example shown in the background art section.

  Further, the outer peripheral side iron core 3 and the end plate 7 communicate with the first through-hole 311 (through-hole) and the second opening 712 (opening), respectively, and the resin part is connected to the first through-hole 311 and the second opening 712. Since 8 is formed and connected by resin, the holding force in the axial direction of the end plate 7 can be strengthened. Furthermore, since the outer peripheral side iron core 3 has the 1st projection part 31 (projection part) extended to an internal diameter side, and provided the 1st through-hole 311 in the 1st projection part 31, the resin part 8 in this 1st through-hole 311 is provided. Even if formed, the first through hole 311 can be prevented from obstructing the magnetic path of the permanent magnet 2. In addition, in the present Example, although the outer peripheral side iron core 3 is provided with the 1st projection part 31 extended to an internal diameter side, this invention is not limited to this. For example, although not shown in the drawing, as the inner peripheral cross-sectional shape of the outer peripheral side iron core 3, a thick portion is formed in the radial direction instead of the first protrusion 31 (in the radial direction such as a polygonal cross section or a star shape in cross section). By forming a through-hole on the inner diameter side of the thick portion), the resin portion 8 is formed in the through-hole provided in a location that does not interfere with the magnetic path of the permanent magnet 2 as in the present embodiment. can do.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Permanent magnet 21 Permanent magnet piece 211 Upper end surface 212 Lower end surface 213 Inner peripheral surface 3 Outer peripheral side iron core 31 1st protrusion part (protrusion part)
311 1st through hole (through hole)
32 outer peripheral surface 33 upper end surface 34 lower end surface 4 buffer member 41 upper buffer member 411 lower end surface 412 inner upper surface 413 outer upper surface 42 lower buffer member 421 upper end surface 422 inner lower surface 423 outer lower surface 43 first recess 44 second recess 5 inner periphery Side iron core 51 Second protrusion 52 Upper end surface 53 Lower end surface 6 Shaft 7 End plate 711 First opening 712 Second opening (opening)
72 Outer end surface 8 Resin portion 9 Stator 91 Stator core 911 Back yoke portion 912 Teeth portion 9121 Tip surface 92 Insulator 93 Stator winding 94 Outer M Permanent magnet motor

Claims (4)

A permanent magnet in which plate-like permanent magnet pieces are arranged in an annular shape, an annular outer peripheral iron core located on the inner diameter side of the permanent magnet, a buffer member located on the inner diameter side of the outer peripheral iron core, and the buffer member A rotor of a permanent magnet electric motor comprising a covered inner iron core, a shaft fixed to the inner iron core, and an end plate for holding the outer iron core and the buffer member in the axial direction. Because
A rotor having a resin portion for fixing the permanent magnet piece to the outer peripheral iron core and fixing the end plate in the axial direction.   The outer peripheral side iron core has a through hole penetrating in the axial direction, the end plate has an opening portion penetrating in the axial direction, and the through hole and the opening portion are respectively communicated to form the resin portion. The rotor according to claim 1.   The rotor according to claim 2, wherein the outer peripheral side iron core has a protruding portion extending toward the inner diameter side, and the through hole is provided in the protruding portion.   A permanent magnet electric motor comprising: the rotor according to any one of claims 1 to 3; and a stator arranged to face the outer peripheral side of the rotor at a predetermined interval.

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