JP2017153343A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a compact structure.SOLUTION: A motor includes a stator, a rotor 20 rotatable relative to the stator, a support member 40, and a circuit assembly. The circuit assembly includes a plurality of electronic components. The rotor is rotatably mounted on the support member. The stator is received in the rotor. The stator is fixed to the support member, and the support member is at least partially received in an inner side of the stator. A portion of the support member received in the inner side of the stator defines a receiving space 417, and at least part of the electronic components of the circuit assembly is received in the receiving space of the support member. The support member is partially received in the inner side of the stator, and the circuit assembly is at least partially received in the support member, which makes the motor have a relatively small axial size.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a drive device, and more particularly to a motor.

  Typically, motors, particularly brushless direct current (BLDC) motors, each include a stator core, a rotor shaft, a housing, a support member, and a circuit assembly. The rotor shaft is rotatably received in the stator core, and the housing is fixed to one end of the rotor shaft and surrounds the periphery of the stator core. The support member is rotatably mounted around the rotor shaft and is disposed adjacent to the stator core. The circuit assembly is received within the support member and disposed at one end of the support member on the side remote from the rotor shaft. However, such motors have a large axial size.

  Therefore, a motor having a compact structure is desired.

  The motor includes a stator, a rotor, a support member, and a circuit assembly. The circuit assembly includes a plurality of electronic components. The rotor is rotatably attached to the support member. The stator is received in the rotor. The support member is at least partially received and secured inside the stator. A portion of the support member received inside the stator defines a receiving space in which at least a portion of the electronic components of the circuit assembly are received.

  The motor further includes a motor shaft, and one end of the motor shaft is preferably fixed to one of the rotor and the support member, and the other end of the motor shaft is rotatably attached to the other of the rotor and the support member.

  The rotor includes a housing and a plurality of permanent magnets, the motor shaft is a rotating shaft having a connection end and an output end, the housing is fixed to the output end of the rotating shaft, and the permanent magnet is a housing. The stator is received in the housing and includes a stator core, a stator winding wound around the stator core, and an insulating bracket disposed between the stator core and the stator winding. The stator core includes a yoke and teeth extending outwardly from the yoke, and the insulating bracket includes a main portion covering the yoke and an extension extending outwardly from the main portion and covering the teeth; The inner side defines a receiving cavity and the support member is preferably received at least partially within the receiving cavity.

  The support member includes an inner wall, a bottom wall, and an outer wall. A connecting end of the rotating shaft is rotatably attached to the inner wall, and the bottom wall is radially outward from a peripheral edge of one end of the inner wall extending into the stator. The outer wall extends in a direction away from the periphery of the bottom wall, the outer wall and the inner wall define a receiving space therebetween, and the insulating bracket of the stator is fixed to the bottom wall of the support member. It is preferable.

  The outer wall includes a support portion and an extension, the support portion extends from the periphery of the bottom wall in a direction away from the stator, the support portion is at least partially disposed inside the stator, and the extension of the outer wall is Preferably, it extends radially outward from the peripheral edge of the distal end of the support portion and is disposed outside the stator, and the outer wall extension is spaced apart from the rotor housing and stator along the motor axial direction.

  The housing includes a cover portion and a peripheral portion, and the cover portion is fixedly mounted around the output end of the rotating shaft to define a plurality of ventilation slots, and the peripheral portion covers from the peripheral edge of the cover portion. The part extends towards the side where the connecting end of the rotating shaft is located, the peripheral part cooperates with the cover part to define a receiving chamber, the stator is received in the receiving chamber, the receiving chamber being a vent slot The outer peripheral edge of the support portion is recessed to form a plurality of air flow grooves, and the first end of the air flow groove communicates with the ventilation slot and the second end of the air flow groove Preferably extends to the extension and communicates with the external environment.

  The motor is a brushless DC motor, and the support member is preferably formed of a heat conductive material.

  The extension of the outer wall forms a support surface in the receiving space, the circuit assembly further includes a circuit board, the electronic component is electrically connected to the circuit board, and the circuit board is a support surface of the extension of the outer wall. It is preferable that it is couple | bonded with.

  The extension of the outer wall forms a notch on one side thereof, and the circuit assembly further includes an electrical plug connection module electrically connected to the circuit board, the electrical plug connection module being cut in the extension of the outer wall. It is preferable that it is arrange | positioned at a notch and is supported on a stator.

  The electrical plug connection module includes a support housing and power pins, signal pins and wiring pins extending into the support housing. The support housing covers the notch, and the power pins, signal pins and wiring pins are arranged in parallel. The wiring pins are preferably electrically connected to the stator winding.

  The end face of the extended portion of the outer wall defines an annular seal groove, a seal plate is attached to the side opposite to the housing of the support member to cover the circuit assembly, an annular seal rib projects from the peripheral edge of the seal plate, Preferably, it is received in a seal groove in the extension of the outer wall.

  Preferably, the end face of the inner wall defines an annular seal groove, a seal plate is attached to the end face of the inner wall, an annular seal rib projects from the peripheral edge of the seal plate, and the seal rib is received in the seal groove of the inner wall.

  The extension of the outer wall forms a support surface in the receiving space, and the circuit assembly is electrically connected to the support bracket attached to the support surface, a conductive plate disposed on the support bracket, and the conductive plate. Preferably, the electronic component received in the receiving space of the support member is attached to the support bracket and electrically connected to the conductive plate.

  It is preferable that a plurality of radiating fins be provided on the outer surface of the extended portion of the outer wall.

  The circuit assembly further includes a plurality of electronic components disposed at a plurality of edges of the support bracket, and the plurality of electronic components are preferably electrically connected to the conductive plate adjacent to the heat dissipating fins.

  The rotor includes a housing and a plurality of permanent magnets, a part of the housing is recessed inward to form a bearing seat, the motor shaft is a fixed shaft, and one end of the fixed shaft is fixed to the support member, The other end of the fixed shaft is movably connected to the bearing seat via a bearing, the permanent magnet is disposed along the inner peripheral edge of the housing, the stator is received in the housing, and is connected to the stator core and the stator core. A plurality of wound stator windings, and an insulating bracket disposed between the stator core and the stator winding, the stator core including a yoke and teeth extending outwardly from the yoke; A main portion covering the yoke and a plurality of extensions extending outwardly from the main portion and covering the teeth of the stator core, the inside of the main portion defining a receiving cavity; Support member, it is preferable to at least partially received in the receiving cavity.

  The support member is partially received inside the stator, and the circuit assembly is at least partially received within the support member, so that the motor has a relatively small axial size.

1 is a perspective view of a motor according to one embodiment. FIG. It is a disassembled perspective view of the motor shown in FIG. It is the perspective view which removed the circuit board and supporting member of the motor shown in FIG. It is a longitudinal cross-sectional view of the motor shown in FIG. It is a perspective view of the stator core of the motor shown in FIG. It is a perspective view of the supporting member of the motor shown in FIG. It is a perspective view of the plug connection module of the motor shown in FIG. It is sectional drawing of the motor by another embodiment of this invention. It is a perspective view of the supporting member of the motor shown in FIG. FIG. 6 is a perspective view of a circuit assembly attached to a motor, according to yet another embodiment of the present invention. FIG. 11 is a perspective view similar to FIG. 10 with the circuit board, support bracket and conductive plate of the circuit assembly removed. It is the perspective view which looked at the circuit assembly shown in FIG. 10 from the other side.

  As shown in FIGS. 1 to 4, the motor 100 according to one embodiment includes a motor shaft 10, a rotor 20, a stator 30, a support member 40, a circuit assembly 50, and a seal member 60. In this embodiment, the motor shaft 10 is a rotating shaft, and the motor 100 is a brushless DC motor that can be used in a cooling module of an automobile engine.

  The rotor 20 includes a rotating shaft 10, a housing 23, and a plurality of permanent magnets 25. The rotating shaft 10 includes a connection end 12 and an output end 14 that are opposite to each other. The housing 23 includes a cover portion 231 and a peripheral portion 233. The cover portion 231 has a disk shape and is fixedly attached around the output end portion 14 of the rotating shaft 10. The cover portion 231 defines a plurality of ventilation slots 2311 (FIG. 8). The peripheral portion 233 extends from the peripheral edge of the cover portion 231 toward one end of the housing 23 where the connection end 12 of the rotary shaft 10 is located, and cooperates with the cover portion 231 to define a cylindrical receiving chamber 235. The receiving chamber 235 communicates with the vent slot 2311. The permanent magnet 25 is fixed to the inner surface of the peripheral portion 233 and is evenly spaced along the circumferential direction of the housing 23.

  The stator 30 is received in the receiving chamber 235 of the housing 23 and faces the permanent magnet 25 of the rotor 20. The stator 30 is spaced from the cover portion 231 of the housing 23 so that the rotor 20 can rotate relative to the stator 30. The stator 30 includes a stator core 31, a plurality of stator windings 33 (FIG. 8) wound around the stator core 31, and an insulating bracket 35 disposed between the stator core 31 and the stator winding 33. Referring to FIG. 5, the stator core 31 includes an annular yoke 312 and a plurality of teeth 314 extending outward from the yoke 312. The yoke 312 defines an internal cylindrical chamber. The stator winding 33 is wound around the teeth 314. The stator core 31 is preferably formed by winding a strip-shaped laminate in the manner described in Chinese Patent Application No. 201510280698 filed by the present applicant, which is hereby incorporated by reference in its entirety. Incorporated into the book. The insulating bracket 35 includes an annular main portion 351 and an extension 353 extending outward from the main portion 351. The main portion 351 covers the annular yoke 312 of the stator core 31. The inner diameter of the main portion 351 is much larger than the outer diameter of the rotating shaft 10. The inside of the main part 351 cooperatively defines a receiving cavity 3511. The rotating shaft 10 passes through the accommodation cavity 3511. The extended portion 353 of the insulating bracket 35 covers the teeth 314 of the stator core 31 and insulates the stator core 31 from the stator winding 33.

  Referring to FIGS. 3, 4, and 6, the support member 40 is preferably made of a heat conductive material such as cast aluminum and is partially received in the receiving cavity 3511 of the stator 30. The support member 40 includes a receiving body 41 and a plurality of attachment portions 43 extending outward from the peripheral edge of the receiving body 41. The receiving body 41 is generally in the shape of a circular housing and is partially received in the receiving cavity 3511. The receiving body 41 includes an annular inner wall 411, a bottom wall 413 and an outer wall 415. The inner wall 411 has a cylindrical shape, and the connection end 12 of the rotary shaft 10 is rotatably attached to the inner wall 411 through a bearing 16. A first seal groove 4111 is formed on the end surface of the shaft end of the inner wall 411. The bottom wall 413 extends radially outward from the peripheral edge of the other end of the inner wall 411 and is disposed adjacent to the cover portion 231 of the housing 23. The outer wall 415 extends from the outer peripheral edge of the bottom wall 413 in a direction away from the cover portion 231. The outer wall 415 and the inner wall 411 define a receiving space 417 therebetween.

  The outer wall 415 includes a support portion 4151 and an extension 4152. The support portion 4151 extends in the axial direction of the rotary shaft 10 from the peripheral portion of the bottom wall 413 toward the outer wall 415 where the connecting end portion 12 of the rotary shaft 10 is located. The support portion 4151 is disposed inside the main portion 351 of the stator 30. The outer peripheral edge of the support portion 4151 is recessed to form a plurality of air flow grooves 4153 (FIG. 6) that are evenly spaced along the peripheral edge of the support portion 4151, and the end of each air flow groove 4153 is 1 The two ventilation slots 2311 communicate with each other. The extension 4152 extends radially outward from the peripheral edge of the distal end of the support portion 4151 and then extends away from the housing 23. The projection of the extended portion 4152 along the axial direction of the rotary shaft 10 is generally annular, and a notch 4154 is defined on one side of the extended portion 4152.

  In this embodiment, the extension 4152 is located outside the receiving chamber 235 of the housing 23 and is spaced from the axial distal end of the peripheral portion 233 of the housing 23 and the stator 30, thereby venting the support portion 4151. The end portion of the air flow groove 4153 on the opposite side to the slot 2311 extends to the expansion portion 4152 so that it can communicate with the external environment. The end surface of the extension 4152 defines a second annular seal groove 4155. An annular support surface 4156 is formed at one end of the extended portion 4152 in the receiving space 417 on the side away from the cover portion 231 of the housing 23. The plane on which the support surface 4156 is located is perpendicular to the axial direction of the rotating shaft 10. The attachment portion 43 extends outward along the axial direction of the outer wall 415. A plurality of heat radiating fins 4157 are preferably provided on the outer surface of the extended portion 4152.

  The circuit assembly 50 includes a circuit board 511, electronic components electrically connected to the circuit board 511, and an electrical plug connection module 58. The circuit board 511 has a circular shape, is attached to the support surface 4156 of the outer wall 415, and is received in the receiving space 417. The electronic components are discretely arranged on one side or both sides of the circuit board 511 and are electrically connected to the circuit board. On the side of the circuit board 511 facing the receiving space 417, electronic components occupying a wide space such as the capacitor 51 and the inductor 53 are arranged and partially or completely received in the receiving space 417. Other thin electronic components can be arranged on the side opposite to the receiving space 417. The electrical plug connection module 58 is disposed on the notch 4154 of the support member 40 and is supported on the stator 30. Referring to FIG. 7, the electrical plug connection module 58 includes a support housing 581, power pins 583, signal pins 585, and wiring pins 587 inserted into the support housing 581. Wiring pins 587 are used to supply power to the stator windings of the motor. The support housing 581 covers the notch 4154. The power pins 583, the signal pins 585, and the wiring pins 587 are arranged in parallel, and one end of each is electrically connected to the circuit board 511. The other end of the power pin 583 and the signal pin 585 is configured to connect to the vehicle control assembly to receive power and control signals, and the other end of the wiring pin 587 is connected to the motor winding. In this embodiment, the motor windings are connected so as to have a three-phase structure, and the circuit board 511 is a printed circuit board.

  The seal member 60 includes a first seal plate 62 and a second seal plate 64. The first seal plate 62 is fixed to one end of the inner wall 411 of the support member 40 adjacent to the circuit board 511. The second seal plate 64 is attached to the side of the support member 40 away from the housing 31 and covers the circuit board 511 and the electronic components on the circuit board 511. The second seal plate 64 and the circuit board 511 are separated by a certain distance so that electronic components can be coupled to the circuit board 511. An annular seal rib 66 protrudes from the peripheral edge of the first seal plate 62, and the seal rib 66 is received in the first seal groove 4111 of the inner wall 411 of the support member 40. An annular seal rib 68 protrudes from the peripheral edge of the second seal plate 64, and the seal rib 68 is received in the second seal groove 4155 of the extended portion 4152 of the support member 40.

  At the time of assembly, the rotor 20 is fixedly attached around the output end 14 of the rotary shaft 10. The stator 30 is fixedly attached to the support member 40. Specifically, the insulating bracket of the stator 30 defines a through hole, the bottom wall 413 of the support member 40 defines a mounting hole, and a fastener such as a screw is passed through each through hole and then fixed to each mounting hole. Thus, the stator 30 can be fixed to the support member 40. Next, the connecting end portion 12 of the rotating shaft 10 is rotatably attached to the inner wall 411 of the support member 40. A first seal plate 62 is attached to the inner wall 411 of the support member 40 to receive the circuit assembly 50 in the support member 40. Finally, the circuit board 50 is enclosed in the support member 40 by attaching the second seal plate 64 to the extended portion 4152 of the support member 40.

  In operation, an external power source transmits power and control signals to the circuit board 511 through the electrical plug connection module 58. When energized, the stator winding 33 of the stator 30 generates an electromagnetic field, and this electromagnetic field interacts with the permanent magnet 25 of the rotor 20 to rotate the rotor 20 and the rotating shaft 10 to output power.

  The support member 40 is at least partially received and supported inside the stator 30, and the portion of the support member 40 received inside the stator 30 defines a receiving space 417 within the receiving space 417 of the support member 40. The acceptance of some of the electronic components of the circuit assembly 50, such as capacitors and inductors, allows the motor 100 to have a relatively small axial size. Compared to existing motors, the thickness of the motor 100 is reduced from 70.8 mm to 55 mm, ie more than 20%.

  The housing 23 defines a ventilation slot 2311, the air flow groove 4153 of the support member 4151 of the support member 40 communicates with the ventilation slot 2311, and the expansion portion 4152 of the support member 40 is separated from the housing 23 and the stator 30, and the air The flow groove 4153 extends to the extended portion 4152 and communicates with the external environment. Therefore, an air flow can flow sequentially from the motor 100 through the ventilation slot 2311 and the air flow groove 4153, thereby improving the heat dissipation performance inside the motor. In addition, the support member 40 is formed of cast aluminum, and thus provides a better heat conduction effect than plastic, thereby further improving the heat dissipation performance.

  The first seal rib 66 and the second seal rib 68 of the seal member 60 are engaged and received in the first seal groove 4111 and the second seal groove 4155 of the support member 40, respectively. Since the support housing 581 covers the notch 4154 of the extended portion 4152, the waterproof performance of the motor 100 is improved.

  8 and 9 show another embodiment of the motor of the present invention. The motor of this embodiment is different from the motor of the above-described embodiment in that the motor shaft 10 is a fixed shaft 10 fixed to the support member 40. Specifically, one end 12 of the motor shaft 10 is fixed to the inner wall 411 of the support shaft 40, and the other end 14 of the motor shaft 10 is rotatably attached to the housing 23 of the rotor 20 via the bearing 16. The rotor 20 can rotate around the axis of the motor shaft 10. Specifically, a bearing sheet 232 is formed at the center of the housing 23 of the rotor 20 by drawing, and the bearing 16 is fixedly received on the bearing sheet 232. In this embodiment, the receiving space 417 of the support member 40 does not extend along the entire periphery of the support member 40, that is, the support member 40 extends along the circumferential direction of the support member 40 in the stator receiving cavity 3511. Occupying only a portion allows another part of the receiving cavity to be left for placement of other components.

  10 to 12 show another embodiment of the motor according to the present invention. In this embodiment, the circuit assembly includes a support bracket 510 that defines a plurality of through holes, a conductive plate 513 disposed on the support bracket 510, a circuit board 511 that is electrically connected to the conductive plate 513, A plurality of first electronic components (not shown) arranged on the circuit board 511 and a plurality of second electronic components 515 electrically connected to the conductive plate 513 are included. The second electronic component 515 includes electronic components that occupy a large space, such as the capacitor 51, the inductor 53, and the MOSFET 55. In this embodiment, the capacitor 51, the inductor 53, and the circuit board 511 are fixed to the opposite side of the support bracket 510. The capacitor 51 and the inductor 53 are electrically connected to the conductive plate 513 through the through hole of the support bracket 510. The MOSFETs 55 are arranged at a plurality of edges of the support bracket 510 so as to be separated from each other, and are electrically connected to the conductive plate 513. The discrete arrangement of the electronic components of the circuit assembly facilitates heat dissipation and effective space utilization. When the circuit assembly is attached to the support member 40, that is, when the circuit assembly is disposed on the side opposite to the cover portion 231 of the expansion portion 4152, a wide space such as the capacitor 51 and the inductor 53 is provided in the receiving space 417 of the support member 40. The receipt of a portion of the second electronic component 515 of the occupying circuit assembly 50 allows the motor to have a relatively small axial size. Another portion of the second electronic component 515, such as the MOSFET 55, disposed at the edges of the support bracket 510 is disposed adjacent to the heat dissipating fin 4157, thereby causing this portion of the second electronic component 515 to The generated heat can be quickly dissipated.

  Although the invention has been described with reference to one or more embodiments, the above description of the embodiments is used only to enable those skilled in the art to make or use the invention. It should be understood by those skilled in the art that various modifications can be made without departing from the spirit or scope of the present invention. The embodiments set forth herein should not be construed as limiting the invention, and the scope of the invention should be determined with reference to the following claims.

Claims (12)

A stator,
A support member that is at least partially received and secured within the stator, and wherein the portion received inside the stator defines a receiving space;
A rotor rotatably attached to the support member and receiving the stator;
A circuit assembly including a plurality of electronic components at least partially received within the receiving space;
A motor comprising: A motor shaft, wherein one end of the motor shaft is fixed to one of the rotor and the support member, and the other end of the motor shaft is rotatably attached to the other of the rotor and the support member;
The motor according to claim 1. The rotor includes a housing and a plurality of permanent magnets, the motor shaft is a rotating shaft having a connection end and an output end, and the housing is fixed to the output end of the rotating shaft, The permanent magnet is disposed along an inner peripheral edge of the housing, and the stator is received in the housing to receive a stator core, a stator winding wound around the stator core, the stator core, and the stator winding. The stator core includes a yoke and teeth extending outwardly from the yoke, and the insulating bracket includes a main portion covering the yoke, and the main portion. A plurality of extensions extending outwardly to cover the teeth, an inner side of the main portion defining a receiving cavity, and the support member having the receiving cap. At least partially received within the tee,
The motor according to claim 2. The support member includes an inner wall, a bottom wall, and an outer wall, the connection end of the rotating shaft is rotatably attached to the inner wall, and the bottom wall is one end of the inner wall extending into the stator. The outer wall extends from the peripheral edge of the bottom wall in a direction away from the stator, the outer wall and the inner wall define a receiving space therebetween, and The insulating bracket is fixed to the bottom wall of the support member;
The motor according to claim 3. The outer wall includes a support portion and an extension portion, and the support portion extends from the peripheral portion of the bottom wall in a direction away from the stator, and the support portion is at least partially on the inner side of the stator. And the extension of the outer wall extends radially outward from a peripheral edge of the distal end of the support portion and is arranged outside the stator, and the extension of the outer wall extends in the axial direction of the motor. Spaced apart from the rotor housing and the stator along
The motor according to claim 4. The housing includes a cover portion and a peripheral portion, and the cover portion is fixedly mounted around the output end of the rotating shaft to define a plurality of ventilation slots, the peripheral portion being the cover portion. Extending from the periphery of the cover portion toward the side of the rotating shaft where the connecting end is located, the peripheral portion cooperates with the cover portion to define a receiving chamber, the stator includes the stator Received in a receiving chamber, the receiving chamber is in communication with the vent slot, and the outer peripheral edge of the support portion is recessed to form a plurality of air flow grooves, the first end of the air flow grooves Communicates with the vent slot and a second end of the air flow groove extends to the extension to communicate with an external environment;
The motor according to claim 5. The motor is a brushless DC motor, and the support member is formed of a heat conductive material.
The motor according to claim 5 or 6. The extension of the outer wall forms a support surface in the receiving space, the circuit assembly further includes a circuit board, the electronic component is electrically connected to the circuit board, and the circuit board includes: Coupled to the support surface of the extension of the outer wall;
The motor according to any one of claims 5 to 7. The extension portion of the outer wall has a notch formed on one side thereof, and the circuit assembly further includes an electrical plug connection module electrically connected to the circuit board, the electrical plug connection module including the electrical plug connection module The electrical plug connection module is disposed in the notch of the extension portion of the outer wall and supported on the stator, and the electrical plug connection module includes a support housing, a power pin, a signal pin, and a wiring pin extending into the support housing, The support housing covers the notch, and the power pin, the signal pin, and the wiring pin are arranged in parallel and electrically connected to the circuit board, and the wiring pin is electrically connected to the stator winding. Connected to the
The motor according to claim 8. The extension of the outer wall forms a support surface in the receiving space, and the circuit assembly includes a support bracket attached to the support surface, a conductive plate disposed on the support bracket, and the conductive assembly. A circuit board electrically connected to the conductive plate, and the electronic component received in the receiving space of the support member is attached to the support bracket and electrically connected to the conductive plate. The
The motor according to any one of claims 5 to 7. A plurality of heat dissipating fins are provided on an outer surface of the extension portion of the outer wall, and the circuit assembly further includes a plurality of electronic components arranged at a plurality of edges of the support bracket, and the plurality of electronic components are Electrically connected to the conductive plate adjacent to the radiating fins;
The motor according to any one of claims 5 to 10. The rotor includes a housing and a plurality of permanent magnets, a part of the housing is recessed inward to form a bearing seat, the motor shaft is a fixed shaft, and one end of the fixed shaft is the support The other end of the fixed shaft is movably connected to the bearing seat via a bearing, the permanent magnet is disposed along the inner peripheral edge of the housing, and the stator is A stator core received within the stator core, a plurality of stator windings wound around the stator core, and an insulating bracket disposed between the stator core and the stator winding, the stator core comprising: a yoke; Teeth extending outward from the yoke, and the insulating bracket includes a main portion covering the yoke, and the stator core extending outward from the main portion. And a plurality of extension portions for covering the teeth, the inside of the main portion defines a receiving cavity, the support member is at least partially received within the receiving cavity,
The motor according to claim 2.