JP6882884B2 - motor - Google Patents

Description

The present invention relates to a drive device, specifically to a motor.

Generally, motors, especially brushless direct current (BLDC) motors, each include a stator core, rotor shaft, housing, support member and circuit assembly. The rotor shaft is rotatably received within the stator core, and the housing is secured to one end of the rotor shaft and surrounds the peripheral edge of the stator core. The support member is rotatably mounted around the rotor shaft and is located adjacent to the stator core. The circuit assembly is received within the support member and is located at one end of the support member on the side away 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. A circuit assembly contains 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 part of the support member received inside the stator defines a receiving space, and at least a part of the electronic components of the circuit assembly is received in the receiving space of the support member.

It is preferred that the motor further includes a motor shaft, one end of the motor shaft being fixed to one of the rotor and the support member, and the other end of the motor shaft 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 connecting end and an output end, the housing is fixed to the output end of the rotating shaft, and the permanent magnets are housings. Arranged along the inner perimeter of the stator, the stator has a stator core, a stator winding wound around the stator core, and an insulating bracket placed between the stator core and the stator windings. The stator core includes a yoke and teeth extending outward from the yoke, and the insulating bracket comprises a main portion covering the yoke and an extension portion extending outward from the main portion covering the teeth and covering the main portion of the main portion. It is preferred that the inside defines the containment cavity and the support member is at least partially accommodated within the containment cavity.

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

The outer wall includes a support portion and an extension portion, the support portion extends from the peripheral edge of the bottom wall in a direction away from the stator, the support portion is arranged at least partially inside the stator, and the extension portion of the outer wall It is preferable that the extension portion of the outer wall extends outward in the radial direction from the peripheral edge of the distal end of the support portion and is arranged outside the stator, and the extension portion of the outer wall is separated from the housing and the stator of the rotor along the axial direction of the motor.

The housing includes a cover portion and a peripheral portion, the cover portion is fixedly attached around the output end of the rotating shaft to define a plurality of ventilation slots, and the peripheral portion covers from the peripheral portion of the cover portion. The portion extends toward the side where the connecting end of the rotating shaft is located, the peripheral portion cooperates with the cover portion to define the receiving chamber, the stator is received in the receiving chamber, and the receiving chamber is a ventilation slot. The outer peripheral edge of the support portion is recessed to form a plurality of airflow grooves, the first end of the airflow groove communicates with the ventilation slot, and the second end of the airflow 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 made of a heat conductive material.

The extension of the outer wall forms a support surface in the receiving space, the circuit assembly further includes the circuit board, the electronic components are electrically connected to the circuit board, and the circuit board is the support surface of the extension of the outer wall. It is preferable to be bound to.

The extension of the outer wall forms a notch on one side thereof, the circuit assembly further includes an electrical plug connection module electrically connected to the circuit board, and the electrical plug connection module is a cut of the extension of the outer wall. It is preferably placed in the notch and supported on the 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. It is preferably electrically connected to the circuit board and the wiring pins are electrically connected to the stator windings.

The end face of the extension 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, the annular seal rib protrudes from the peripheral edge of the seal plate, and the seal rib is , It is preferable that it is received in the seal groove of the extension portion of the outer wall.

It is preferable that 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, the annular seal rib protrudes from the peripheral edge of the seal plate, and the seal rib is accepted 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 mounted on the support surface, the conductive plate placed on the support bracket, and the conductive plate. It is preferable that the electronic component received in the receiving space of the support member, including the circuit board provided with the circuit board, is attached to the support bracket and electrically connected to the conductive plate.

It is preferable that a plurality of heat radiation fins are provided on the outer surface of the extension portion of the outer wall.

The circuit assembly further includes a plurality of electronic components located at the plurality of edges of the support bracket, which are preferably electrically connected to the conductive plate adjacent to the radiating fins.

The rotor includes a housing and a plurality of permanent magnets, a portion 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 a support member. The other end of the fixed shaft is movably connected to the bearing seat via bearings, permanent magnets are placed along the inner peripheral edge of the housing, and the stator is received within the housing to the stator core and the stator core. The stator core includes a plurality of wound stator windings and an insulating bracket disposed between the stator core and the stator windings, the stator core including a yoke and teeth extending outward from the yoke, and the insulating bracket. It includes a main part covering the yoke and a plurality of extensions extending outward from the main part to cover the teeth of the stator core, the inside of the main part defining the containment cavity and the support members at least partially within the containment cavity. It is preferable to be accepted by.

The support member is partially received inside the stator and the circuit assembly is at least partially received within the support member, which causes the motor to have a relatively small axial size.

It is a perspective view of the motor by one Embodiment. It is an exploded perspective view of the motor shown in FIG. It is a perspective view which removed the circuit board and the support member of the motor shown in FIG. It is a vertical 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 support 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 support member of the motor shown in FIG. FIG. 3 is a perspective view of a circuit assembly attached to a motor according to yet another embodiment of the present invention. It is the same perspective view as FIG. 10 which removed the circuit board, the support bracket and the conductive plate of a circuit assembly. FIG. 5 is a perspective view of the circuit assembly shown in FIG. 10 as viewed from another 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 connecting end 12 and an output end 14 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 connecting end 12 of the rotating 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 ventilation slot 2311. The permanent magnets 25 are fixed to the inner surface of the peripheral portion 233 and are 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 separated from the cover portion 231 of the housing 23 so that the rotor 20 can rotate with respect 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 arranged between the stator core 31 and the stator windings 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 by the method described in Chinese Patent Application No. 201510280698 filed by the applicant, and the entire contents of this patent application are cited herein by reference. Incorporated into the book. The insulating bracket 35 includes an annular main portion 351 and an extension portion 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 portion 351 collaboratively defines the containment cavity 3511. The rotating shaft 10 passes through the accommodating cavity 3511. The extension 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.

With reference to FIGS. 3, 4 and 6, it is preferred that the support member 40 is made of a heat conductive material such as cast aluminum and is partially accommodated in the accommodating cavity 3511 of the stator 30. The support member 40 includes a receiving body 41 and a plurality of mounting portions 43 extending outward from the peripheral edge of the receiving body 41. The receiving body 41 is entirely in the shape of a circular housing and is partially received within the containment 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 a connecting end portion 12 of the rotating shaft 10 is rotatably attached to the inside of the inner wall 411 via 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 outward in the radial direction from the peripheral edge of the other end of the inner wall 411 and is arranged 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 between them.

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

In this embodiment, the extension 4152 is located outside the receiving chamber 235 of the housing 23 and is separated from the axially distal end of the peripheral portion 233 of the housing 23 and the stator 30 to vent the support portion 4151. The end of the airflow groove 4153 on the opposite side of the slot 2311 extends to the expansion portion 4152 so that it can communicate with the external environment. The end face of the expansion portion 4152 defines a second annular seal groove 4155. An annular support surface 4156 is formed at one end of the expansion portion 4152 on the side of 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 mounting portion 43 extends outward along the axial direction of the outer wall 415. It is preferable that a plurality of heat radiation fins 4157 are provided on the outer surface of the expansion 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 is circular and is attached to the support surface 4156 of the outer wall 415 to be 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. Electronic components that occupy a large space such as a capacitor 51 and an inductor 53 are arranged on the side of the circuit board 511 facing the receiving space 417 and are partially or completely received in the receiving space 417. Other thin electronic components can be arranged on the opposite side of the receiving space 417. The electrical plug connection module 58 is arranged in 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, a power pin 583, a signal pin 585 and a wiring pin 587 inserted into the support housing 581. Wiring pin 587 is used to power the stator windings of the motor. The support housing 581 covers the notch 4154. The power pin 583, the signal pin 585, and the wiring pin 587 are arranged in parallel, and one end of each is electrically connected to the circuit board 511. The other ends of the power pins 583 and signal pins 585 are configured to connect to the automotive control assembly to receive power and control signals, and the other ends of the wiring pins 587 are connected to the windings of the motor. In this embodiment, the windings of the motor are connected so as to have a three-phase structure, and the circuit board 511 is a printed circuit board.

The sealing member 60 includes a first sealing plate 62 and a second sealing 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 projects 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 projects 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 extension 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 rotating 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. Thereby, 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. The first seal plate 62 is attached to the inner wall 411 of the support member 40, and the circuit assembly 50 is received 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 expansion portion 4152 of the support member 40.

During 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, thereby outputting 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 that occupy a large space, 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, i.e. 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 to provide air. The flow groove 4153 extends to the expansion portion 4152 and communicates with the external environment. Therefore, the air flow can flow from the motor 100 in order through the ventilation slot 2311 and the air flow groove 4153, thereby improving the heat dissipation performance inside the motor. Further, the support member 40 is made of cast aluminum, and therefore provides a better heat conduction effect than plastic, so that the heat dissipation performance is further improved.

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, and are received, and the electric plug connection module 58 By covering the notch 4154 of the expansion portion 4152 with the support housing 581 of the above, 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 about the axis of the motor shaft 10. Specifically, a bearing sheet 232 is formed in 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 circumference of the support member 40, that is, the support member 40 is located in the stator accommodating cavity 3511 along the circumferential direction of the support member 40. By occupying only part, another part of the containment cavity can 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 comprises a support bracket 510 that defines a plurality of through holes, a conductive plate 513 arranged on the support bracket 510, and a circuit board 511 electrically connected to the conductive plate 513. It includes 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. The second electronic component 515 includes an electronic component that occupies a large space, such as a capacitor 51, an inductor 53, and a 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 holes of the support bracket 510. The MOSFETs 55 are spaced apart from each other at a plurality of edges of the support bracket 510 and are electrically connected to the conductive plate 513. The discrete arrangement of the electronic components of the circuit assembly promotes heat dissipation and effective space utilization. When attaching the circuit assembly to the support member 40, that is, when arranging the expansion portion 4152 on the side opposite to the cover portion 231, a large space such as a capacitor 51 and an inductor 53 is provided in the receiving space 417 of the support member 40. The acceptance of a portion of the second electronic component 515 of the circuit assembly 50 that occupies allows the motor to have a relatively small axial size. Another portion of the second electronic component 515 located at the plurality of edges of the support bracket 510, such as the MOSFET 55, is located adjacent to the heat dissipation fins 4157, thereby by this portion of the second electronic component 515. The generated heat can be quickly dissipated.

Although the present invention has been described with reference to one or more embodiments, the description of the embodiments described above will only be used to enable those skilled in the art to carry out or use the invention. Those skilled in the art should understand that various modifications can be made without departing from the spirit or scope of the present invention. The embodiments presented herein should not be construed as limiting the invention, and the scope of the invention should be determined with reference to the claims below.

Claims (12)

With the stator
A support member that is at least partially received and fixed to the inside of the stator, and the portion received inside the stator defines the receiving space.
A rotor that is rotatably attached to the support member and receives the stator,
A circuit assembly containing multiple electronic components that are at least partially accepted within the receiving space.
With
The support member includes an outer wall surrounding the receiving space, the outer wall including a support portion and an extension portion, the support portion extending in a direction away from the stator and at least partially arranged inside the stator. The extension portion of the outer wall extends outward in the radial direction from the peripheral edge portion of the distal end of the support portion and is arranged outside the stator.
The rotor includes a housing and a plurality of permanent magnets, the housing includes a cover portion and a peripheral portion, the permanent magnets are fixed to the peripheral portion, and the cover portion defines a plurality of ventilation slots. The outer peripheral edge of the support portion is recessed so as to form a plurality of air flow grooves, the first end portion of the air flow groove communicates with the ventilation slot, and the second end portion of the air flow groove is said. Extends to the extension and communicates with the external environment,
A motor characterized by that. A motor shaft is further provided, 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 motor shaft is a rotating shaft having a connecting end and an output end, the housing is fixed to the output end of the rotating shaft, and the permanent magnet is along the inner peripheral edge of the housing. Disposed, the stator comprises a stator core, a stator winding wound around the stator core, and an insulating bracket disposed between the stator core and the stator winding, which is received in the housing. The stator core includes a yoke and teeth extending outward from the yoke, and the insulating bracket comprises a main portion covering the yoke and a plurality of extensions extending outward from the main portion and covering the teeth. The inside of the main portion defines a containment cavity, and the support member is at least partially received within the containment cavity.
The motor according to claim 2. The support member further includes an inner wall and a bottom wall, the connecting end of the rotating shaft is rotatably attached to the inner wall, and the bottom wall is a peripheral edge of one end of the inner wall extending into the stator. The outer wall extends outward in the radial direction, the support portion of the outer wall extends away from the stator from the peripheral edge of the bottom wall, and the outer wall and the inner wall define a receiving space between them. The insulating bracket of the stator is fixed to the bottom wall of the support member.
The motor according to claim 3. The extension of the outer wall is separated from the rotor housing and the stator along the axial direction of the motor.
The motor according to claim 4. The peripheral portion extends from the peripheral edge portion of the cover portion toward the side of the cover portion where the connection end portion of the rotating shaft is located, and the peripheral portion cooperates with the cover portion to receive a chamber. The stator is received in the receiving chamber, and the receiving chamber communicates with the ventilation slot.
The motor according to claim 5. The motor is a brushless DC motor, and the support member is made of a heat conductive material.
The motor according to claim 5 or 6. The extension of the outer wall forms a support surface, the circuit assembly further includes a circuit board, the electronic components are electrically connected to the circuit board, and the circuit board is the extension of the outer wall. Joined to the support surface of the portion,
The motor according to any one of claims 5 to 7. The extension of the outer wall forms a notch on one side thereof, the circuit assembly further comprises an electrical plug connection module electrically connected to the circuit board, the electrical plug connection module said. Arranged in the notch of the extension of the outer wall and supported on the stator, the electrical plug connection module comprises a support housing and power pins, signal pins and wiring pins extending into the support housing. The support housing covers the notch, 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 motor according to claim 8. The extension portion 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 arranged on the support bracket, and the conductivity. The electronic component, further including a circuit board electrically connected to the property plate and received in the receiving space of the support member, is attached to the support bracket and electrically connected to the conductive plate. Ru,
The motor according to any one of claims 1 to 7. A plurality of radiating fins are provided on the outer surface of the extension portion of the outer wall, and the circuit assembly further includes a plurality of second electronic components arranged at a plurality of edges of the support bracket, and the plurality of second electronic components. electronic components are adjacent to the radiating fins is electrically connected to the conductive plate,
The motor according to claim 10. A part of the housing is recessed inward to form a bearing sheet, the motor shaft is a fixed shaft, one end of the fixed shaft is fixed to the support member, and the other end of the fixed shaft is a bearing. The permanent magnet is movably connected to the bearing sheet via the housing, the permanent magnet is arranged along the inner peripheral edge of the housing, and the stator is received in the housing and wound around the stator core and the stator core. The stator core includes a plurality of stator windings and an insulating bracket disposed between the stator core and the stator windings, the stator core including a yoke and teeth extending outward from the yoke, said insulation. The bracket includes a main portion that covers the yoke and a plurality of extensions that extend outward from the main portion and cover the teeth of the stator core, the inside of the main portion defining a housing cavity and the support member. Is at least partially accepted within the containment cavity.
The motor according to claim 2.

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