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WO2016017166A1 - Moteur - Google Patents

Moteur Download PDF

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Publication number
WO2016017166A1
WO2016017166A1 PCT/JP2015/003811 JP2015003811W WO2016017166A1 WO 2016017166 A1 WO2016017166 A1 WO 2016017166A1 JP 2015003811 W JP2015003811 W JP 2015003811W WO 2016017166 A1 WO2016017166 A1 WO 2016017166A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
motor
rotor
magnet
circuit unit
Prior art date
Application number
PCT/JP2015/003811
Other languages
English (en)
Japanese (ja)
Inventor
雄一郎 定永
Original Assignee
パナソニックＩｐマネジメント株式会社
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 パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2016017166A1 publication Critical patent/WO2016017166A1/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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

  • the present invention relates to a motor including a magnetic detection element for detecting the position of the rotor, and more particularly to a structure for detecting the rotor position of the motor.
  • ⁇ Brushless motors need to know the position of the rotor in order to smoothly control the rotation of the motor. For this reason, conventionally, a main magnet for field and a sensor magnet for rotor position detection are held on the motor output shaft, and a magnetic detection element as a magnetic detection means is arranged on the circuit board so that the rotor position is determined.
  • the structure to be detected is generally known.
  • FIG 4, 5 and 6 are cross-sectional views showing a configuration example of a conventional brushless motor having such a structure for detecting the rotor position.
  • the conventional brushless motor shown in FIG. 4 has a magnetic circuit unit 80 including a stator 84 and a rotor 85, and an electronic circuit unit 90 including an electronic circuit and components for storing the electronic circuit. And the electronic circuit unit 90 are provided with partition walls 73 that separate the respective spaces.
  • the sensor magnet 86 for detecting the position of the rotor 85 is opposed to the magnetic detection element 95 as magnetic detection means arranged on the circuit board 92 in the electronic circuit section 90 with the partition wall 73 interposed therebetween.
  • the rotor position detection structure is arranged as described above.
  • the conventional brushless motor shown in FIG. 5 is provided with a through hole 73h for passing the motor rotation shaft 85a in the partition wall 73, and for detecting the position of the rotor 85 at the tip of the rotation shaft 15a passing through the through hole 73h.
  • a sensor magnet 86 is held.
  • the brushless motor has a rotor position detection structure in which the sensor magnet 86 is arranged to face the magnetic detection element 95 as magnetic detection means arranged on the circuit board 92 in the electronic circuit unit 90. ing.
  • the brushless motor disclosed in Patent Document 1 shown in FIG. 6 is a brushless motor having a configuration in which the magnetic circuit unit 80 and the electronic circuit unit 90 exist in the same space, and a partition wall is eliminated.
  • the brushless motor one end face of the field magnet main magnet 85b of the rotor 85 and the magnetic detection element 95 as magnetic detection means arranged on the circuit board 92 are arranged to face each other. A rotor position detection structure is described.
  • the electronic component group in motors used in high temperature environments such as in-vehicle applications, it is indispensable to protect an electronic component group including a magnetic detection element mounted on a circuit board from the influence of heat.
  • the electronic component group in a motor used in the vicinity of a car engine room (environment with an ambient temperature of 90 ° C. or more), the electronic component group may be arranged to receive as little heat as possible from heat generated from a motor magnetic circuit unit such as a coil. It becomes important. That is, in the conventional brushless motor having the above-described structure, it is important to protect the electronic component group including the magnetic detection element 95 mounted on the circuit board 92 from the influence of heat generated in the magnetic circuit unit 80.
  • the magnetic detection element 95 disposed on the circuit board 92 detects the rotor magnetic field generated from the sensor magnet 86 and outputs a voltage corresponding to the strength, the relative position accuracy with the rotor magnetic pole is important. It becomes.
  • the partition wall thickness is increased in the case of the conventional brushless motor structure shown in FIG. Therefore, it is necessary to prevent heat conduction to the electronic circuit unit 90.
  • the sensor magnet 86 and the rotor 85 in the assembly process cannot be assembled at the same time. For this reason, the magnetizing process for magnetizing the main magnet 85b for the field of the rotor 85 and the sensor magnet 86 must be performed separately, and the magnetic pole position accuracy may be deteriorated.
  • the magnetic detection element 95 such as a Hall element has a large change in characteristics due to heat, and thus there is a concern that the position accuracy may be deteriorated, and the magnetic detection element 95 itself is damaged due to damage and causes malfunction due to malfunction. It was a factor.
  • a motor includes a magnetic circuit unit having a stator in which a coil is wound around a stator core, a rotor magnet disposed so as to face the stator core, and a rotor that holds a position detection sensor magnet around a rotation axis;
  • the electronic circuit part which has the circuit board which mounted the circuit component containing a detection element, and the partition which is arrange
  • the magnetic detection element disposed on the circuit board is disposed opposite to the sensor magnet with the partition wall interposed therebetween, and the auxiliary is made of a magnetic material disposed opposite to the sensor magnet with the partition wall and the magnetic detection element interposed therebetween. It has a sensor yoke.
  • the auxiliary sensor yoke is fixedly supported on a rotating shaft that penetrates the partition wall.
  • the bulkhead prevents the electronic circuit unit from receiving heat due to heat generated in the magnetic circuit unit, so that the electronic component group including the magnetic detection element mounted on the circuit board is not easily affected by heat, and the reliability of the electronic circuit unit Can be improved.
  • FIG. 1 is an external perspective view of a motor according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view of the motor according to the first embodiment of the present invention.
  • FIG. 3A is a cross-sectional enlarged view of a magnetic flux linkage part according to Embodiment 1 of the present invention.
  • FIG. 3B is a cross-sectional enlarged view of a motor magnetic flux linkage part of the first conventional example for comparison with FIG. 3A.
  • FIG. 4 is a cross-sectional view showing an example of a conventional brushless motor.
  • FIG. 5 is a sectional view showing another example of a conventional brushless motor.
  • FIG. 6 is a sectional view showing still another example of a conventional brushless motor.
  • a motor used in the vicinity of a car engine room is used, for example, in an electric oil pump that supplies hydraulic oil or lubricating oil to a hydraulic control device of an automatic transmission.
  • a brushless motor for an electric oil pump used in a vehicle will be described as an example of a motor.
  • FIG. 1 is a perspective view showing an appearance of a motor 100 according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a side surface of motor 100 in the embodiment of the present invention.
  • the motor 100 which is a brushless motor includes a bracket 23, a motor frame 11 disposed on one side of the bracket 23, and a bottom plate 21 disposed on the other side of the bracket 23 as shown in FIGS.
  • the motor frame 11 houses a stator 14 having a coil and a rotor 15 having a permanent magnet and rotating around a rotation axis.
  • the magnetic circuit unit 10 is configured.
  • a rotating shaft 15 a protrudes from the top surface of the motor frame 11 as an output shaft through an oil seal 12.
  • the rotating shaft 15a rotates to function as a motor.
  • a circuit board 22 on which electronic components described below are mounted is accommodated in the bracket 23, and the electronic circuit unit 20 is configured by these electronic components and the like.
  • the bracket 23 has a connector portion 24 for supplying power and signals to the circuit board 22.
  • fever from an electronic component is arrange
  • the motor frame 11 is formed in a substantially cylindrical shape by processing an iron plate, having one side as a top surface, an opening that is an opening on the bottom side that is the other side, and a space inside. And the flange 11f which spreads from an opening part to an outer peripheral side is provided for the assembly
  • the motor frame 11 and the resin bracket 23 are fitted and fixed by means such as press fitting or screw tightening.
  • a bearing 13a and an oil seal 12 are held on the output shaft side of the motor frame 11 from which the rotating shaft 15a protrudes.
  • a stator 14 is press-fitted and fixed to the inner diameter portion of the motor frame 11, and a rotor 15 is rotatably included through a gap.
  • the stator 14 includes a stator core 14a, an insulator 14b, and a coil 14c.
  • the stator core 14a is formed by laminating a plurality of steel plates, for example, and has a plurality of salient poles projecting to the inner peripheral side.
  • a coil 14c is wound around each salient pole via an insulator 14b formed of an insulating resin or the like.
  • the coil 14c being wound is a three-phase winding, and various winding patterns exist depending on the number of poles of a rotor magnet 15b described later.
  • the rotor 15 includes a cylindrical rotor magnet 15b, a substantially cup-shaped rotor frame 15c, and a rotating shaft 15a penetrating the inner peripheral side of the rotor frame 15c.
  • the rotor magnet 15b is made of a permanent magnet, and is bonded and fixed to the rotor frame 15c.
  • the rotor magnet 15b has magnetic poles in which N poles and S poles are alternately arranged.
  • the rotor magnet 15b is magnetized to the number of poles such as 8 poles and 10 poles.
  • the rotor frame 15c is formed in a substantially cup shape by processing an iron plate, and is configured by arranging the two rotor frames 15c in opposite directions in the axial direction so as to face each other.
  • the rotor frame 15c is fixed by press-fitting the rotary shaft 15a into the inner diameter hole.
  • the rotor frame 15c also serves as a back yoke of the rotor magnet 15b and constitutes a part of the magnetic path.
  • the rotating shaft 15a is made of metal such as iron, and is rotatably supported by a bearing 13a on the output side and a bearing 13b on the opposite output side. And the rotating shaft 15a has a role which transmits the output which the motor 100 rotates to the other party apparatus, for example, an oil pump.
  • the output-side tip of the rotary shaft 15a is processed into a D-cut (processing to make a cylinder D-shaped) or a two-sided width (processing a cylinder into two parallel surfaces) for connection to a counterpart device. Yes.
  • a sensor magnet holder 17 made of a substantially disk-shaped metal is used for press-fitting or the like on the opposite output side of the rotary shaft 15 a in order to position and hold the sensor magnet 16. It is fixed using.
  • a sensor magnet 16 is bonded and fixed to the sensor magnet holder 17.
  • the sensor magnet 16 is a permanent magnet that is magnetized and magnetized so as to have the same magnetic pole pattern arrangement as that of the rotor magnet 15b.
  • the rotational position of the rotor 15 is detected by detecting the magnetism of the sensor magnet 16 using a magnetic detection element.
  • Such a sensor magnet holder 17 also rotates together with the rotor 15 about the rotation shaft 15a.
  • the rotor magnet 16 rotates so as to move in the circumferential direction while facing the surface of the bracket 23 on the magnetic circuit unit 10 side at a constant interval.
  • the rotor magnet may be used as a sensor magnet for detecting the position of the rotor 15, or the rotor magnet and the sensor magnet may be integrally formed.
  • the bottom plate 21 is made of aluminum die casting, and has continuous substantially triangular radiating fins for radiating heat generated by the electronic component 22a on the circuit board 22.
  • the bracket 23 is made of a thermoplastic resin having electrical insulation. More specifically, the resin bracket 23 is made of an electrically insulating thermoplastic resin made of polyphenylene sulfide resin (hereinafter referred to as PPS resin). And the bracket 23 of this Embodiment is formed by insert molding in order to enclose and integrate the various components mentioned later.
  • PPS resin polyphenylene sulfide resin
  • bracket 23 By creating the bracket 23 using PPS resin, thin wall molding is possible and the design freedom of the shape is improved. Furthermore, by using PPS resin, there is little sinking even if various parts are included, and dimensional stability can be ensured, and the moldability is excellent. In addition, high productivity due to short tact can be ensured, and the cost is excellent. Furthermore, it is excellent in heat resistance.
  • the shape of the bracket 23 is generally a structure like a box that is thin in the axial direction, with the top side closed, an opening on the bottom side, and a space inside.
  • the top side of the bracket 23 is closed by a flat plate portion 23a that spreads in a flat plate shape, and the magnetic circuit portion 10 side projects from the flat plate portion 23a to the magnetic circuit portion 10 side so as to protrude from the motor frame. 11, a motor frame receiving portion 23b for receiving the bearing 11 and a bearing receiving portion 23c for receiving the bearing 13b are formed.
  • the bottom plate 21 and the bracket 23 made of PPS resin are fixed by means such as screw tightening. And the circuit board 22 is accommodated in the space in the bracket 23 closed so that the bottom plate 21 may cover.
  • the circuit board 22 has a configuration in which general electronic parts such as chip parts such as ICs, microcomputers, resistors, and capacitors are mounted on the board 22b. These electronic components constitute a drive circuit for energizing and driving the coil 14 c of the stator 14. Further, as shown in FIG. 2, a Hall element 25 is mounted on the circuit board 22 as a magnetic detection means so as to face the sensor magnet 16 with the bracket 23 interposed therebetween. The Hall element 25 is arranged on the circuit board 22 in this way, and detects the magnetic poles of the sensor magnet 16 magnetized in correspondence with the magnetic poles of the rotor magnet 15b.
  • bracket 23 that houses the circuit board 22 and structurally separates the magnetic circuit unit 10 and the electronic circuit unit 20 will be described.
  • bracket 23 made of PPS resin formed in this way an inlay having a fitting shape for positioning is provided on the magnetic circuit portion 10 side in order to fit and fix the motor frame 11. The coaxial with the part 10 is ensured.
  • the bracket 23 has a metal bearing holder 18 integrated with the bearing receiving portion 23c on the magnetic circuit portion 10 side by insert molding in order to insert the bearing 13b.
  • the bracket 23 holds and fixes the bearing 13b by the bearing holder 18 formed in this way.
  • the bearing 13b and the bearing holder 18 are made of the same type of iron-based metal, there is no relative change in dimensions due to the difference in the coefficient of thermal expansion, so that the creep phenomenon can be prevented.
  • a wave washer 19 for preloading the rotor 15 is inserted between the bearing 13 b and the bearing holder 18.
  • the electronic circuit unit 20 side of the bracket 23 made of PPS resin also serves as a circuit holder for mechanically holding and fixing the circuit board 22, and the circuit board 22 is fixed by means such as welding or screw tightening.
  • a 3-phase bus bar for connecting a 3-phase lead wire from the coil 14c and connecting to the circuit board 22, a power supply terminal, and a signal terminal are made of PPS resin while maintaining electrical insulation. It is arranged on the bracket 23.
  • the bracket 23 of the present embodiment is insert-molded including these bus bars and power supply terminals.
  • nuts for mechanically connecting and fixing the motor frame 11 and the bottom plate 21 are also enclosed in a bracket 23 made of PPS resin and insert-molded.
  • a bracket 23 made of PPS resin and insert-molded By encapsulating these metal terminals and coupling members in a PPS resin bracket 23 and insert molding them, the number of parts and the number of assembly steps can be reduced.
  • the power supply terminal and the signal terminal are integrally formed with the connector portion 24 and the bracket 23 made of PPS resin so that electrical connection to the outside can be easily performed, thereby forming a direct connector.
  • a direct connector it is possible to prevent disconnection due to bending of the lead wire for connection to the outside and deterioration of the sealing performance inside the motor, and it is possible to provide a highly reliable connection portion.
  • the bracket 23 is formed of a resin having an electrically insulating characteristic, thereby preventing a short circuit between the magnetic circuit unit 10 and the electronic circuit unit 20. Moreover, since the magnetic circuit part 10 is provided with the coil 14c, the emitted-heat amount from these coils 14c is large. In the present embodiment, in order to protect the circuit components of the electronic circuit unit 20 from such heat of the magnetic circuit unit 10, the space between the magnetic circuit unit 10 and the electronic circuit unit 20 is isolated between each other. A bracket 23 is arranged. That is, in the present embodiment, by disposing the bracket 23 serving as a partition wall between the magnetic circuit unit 10 and the electronic circuit unit 20, heat is transferred from the coil 14 c of the stator 14 to the electronic component of the circuit board 22. Is suppressed.
  • an auxiliary sensor yoke 31 is further arranged on the electronic circuit unit 20 side of the bracket 23 as shown in FIG.
  • the auxiliary sensor yoke 31 is made of a magnetic material such as a substantially disk-shaped iron plate, for example.
  • the auxiliary sensor yoke 31 is disposed to face the sensor magnet 16 with the bracket 23 and the hall element 25 mounted on the circuit board 22 interposed therebetween. That is, in order to arrange such an auxiliary sensor yoke 31, the rotating shaft 15a extends through the bracket 23 and the through hole formed in the circuit board 22 and extends to the electronic circuit unit 20 side.
  • the auxiliary sensor yoke 31 is fixed to the tip of the rotating shaft 15a on the side opposite to the output shaft of the electronic circuit unit 20 by using a fixing means such as a push nut 32.
  • FIG. 3A is an enlarged cross-sectional view of the magnetic flux interlinkage according to the embodiment of the present invention, and shows a cross-sectional state in which the Hall element 25 is sandwiched between the sensor magnet 16 and the auxiliary sensor yoke 31.
  • FIG. 3B is an enlarged cross-sectional view of the magnetic flux linkage portion of the conventional motor for comparison with FIG. 3A, and shows a cross-sectional state when the auxiliary sensor yoke 31 is not disposed.
  • the magnetic flux 30 generated from the sensor magnet 16 does not sufficiently interlink with the Hall element 25 as the Hall element 25 moves away from the sensor magnet 16.
  • the magnetic flux 30 generated from the sensor magnet 16 closes the magnetic path via the auxiliary sensor yoke 31. It will be. That is, the magnetic flux 30 that connects the sensor magnet 16 and the auxiliary sensor yoke 31 is generated. For this reason, with the configuration shown in FIG. 3A, even if the Hall element 25 moves away from the sensor magnet 16, the magnetic flux 30 generated from the sensor magnet 16 is sufficiently linked to the Hall element 25. The detection accuracy can be maintained. Further, since such a magnetic path by the auxiliary sensor yoke 31 is not affected by the magnetic pole position of the rotor magnet 15b, it is possible to ensure good magnetic pole accuracy and thereby the rotational position accuracy of the motor.
  • the bracket 23 serving as a partition wall is used to prevent heat generated in the magnetic circuit unit 10 from being conducted to the electronic circuit unit 20. It is necessary to increase the thickness dimension.
  • the present embodiment is configured to include the auxiliary sensor yoke 31 as described above. For this reason, since the magnetic flux 30 generated from the sensor magnet 16 closes the magnetic path via the auxiliary sensor yoke 31 as described above, the magnetic flux 30 can be sufficiently linked to the Hall element 25 as the magnetic detection means. Become.
  • the rotor position detection structure of the motor according to the present invention can improve the detection accuracy, it can be applied not only to an in-vehicle motor but also to an industrial motor, a home appliance motor, and the like. . In particular, it is useful in the motor field where high reliability is required in a high temperature environment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)

Abstract

L'invention concerne un moteur ayant une section de circuit magnétique comprenant les éléments suivants : un stator comprenant un noyau de stator autour duquel une bobine est enroulée ; et un rotor qui retient un aimant de rotor et un aimant de capteur de détection de position, de sorte que ceux-ci sont centrés sur un arbre rotatif, l'aimant de rotor étant placé de manière à faire face au noyau de stator. Le moteur comporte également les éléments suivants : une section de circuit électronique comprenant une carte de circuit sur laquelle des composants de circuit comprenant un élément de détection magnétique sont montés ; une paroi de séparation qui est disposée entre la section de circuit magnétique et la section de circuit électronique et sépare les espaces respectifs ; et une culasse de détecteur auxiliaire qui est disposée de manière à faire face à l'aimant de détection avec la paroi de division et l'élément de détection magnétique interposé entre celles-ci. La culasse de détecteur auxiliaire est supportée de manière fixe par l'arbre rotatif du moteur.
PCT/JP2015/003811 2014-08-01 2015-07-29 Moteur WO2016017166A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014157525 2014-08-01
JP2014-157525 2014-08-01

Publications (1)

Publication Number Publication Date
WO2016017166A1 true WO2016017166A1 (fr) 2016-02-04

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ID=55217077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/003811 WO2016017166A1 (fr) 2014-08-01 2015-07-29 Moteur

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WO (1) WO2016017166A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06303752A (ja) * 1993-04-12 1994-10-28 Seiko Epson Corp ブラシレスモータの位置検出用磁気回路
JP2002252958A (ja) * 2001-02-23 2002-09-06 Mitsubishi Electric Corp ブラシレスｄｃモータ
WO2003016829A1 (fr) * 2001-08-07 2003-02-27 Namiki Seimitsu Houseki Kabushiki Kaisha Micro-codeur et micro-moteur magnetiques
JP2003111324A (ja) * 2001-09-27 2003-04-11 Mitsubishi Electric Corp 直流ブラシレスモータの回転子及び送風機及び空気調和機
JP2012170265A (ja) * 2011-02-15 2012-09-06 Shinano Kenshi Co Ltd ファンモータ
WO2013035349A1 (fr) * 2011-09-08 2013-03-14 三菱電機株式会社 Moteur et pompe, unité de climatisation, unité d'approvisionnement en eau chaude et unité de source de chaleur en étant équipée

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06303752A (ja) * 1993-04-12 1994-10-28 Seiko Epson Corp ブラシレスモータの位置検出用磁気回路
JP2002252958A (ja) * 2001-02-23 2002-09-06 Mitsubishi Electric Corp ブラシレスｄｃモータ
WO2003016829A1 (fr) * 2001-08-07 2003-02-27 Namiki Seimitsu Houseki Kabushiki Kaisha Micro-codeur et micro-moteur magnetiques
JP2003111324A (ja) * 2001-09-27 2003-04-11 Mitsubishi Electric Corp 直流ブラシレスモータの回転子及び送風機及び空気調和機
JP2012170265A (ja) * 2011-02-15 2012-09-06 Shinano Kenshi Co Ltd ファンモータ
WO2013035349A1 (fr) * 2011-09-08 2013-03-14 三菱電機株式会社 Moteur et pompe, unité de climatisation, unité d'approvisionnement en eau chaude et unité de source de chaleur en étant équipée

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