Electric brush assembly, motor and vehicle

Abstract

The utility model provides an electric brush assembly, a motor and a vehicle. The electric brush assembly comprises a base, a plurality of brush holding parts, a plurality of electric brushes in one-to-one correspondence with the plurality of brush holding parts, and a cooling piece. The base comprises a through hole. The plurality of brush holding parts are arranged on the surface of the base and are arranged on the outer edge of the through hole at intervals; the brush is attached to the brush holder. The cooling part is suitable for cooling the brush holder part. The cooling piece is arranged to take away heat generated at the electric brush abrasion position and conducted to the brush holder part, and heat dissipation of the electric brush assembly is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of magnetic motors, and in particular to a brush assembly, a motor and a vehicle. Background Art

[0002] As a type of new energy vehicle drive motor, the electrically excited AC synchronous motor (hereinafter referred to as the electrically excited motor) has attracted more and more attention from automobile manufacturers due to its advantages such as adjustable excitation and good high-speed performance. In the electrically excited motor, the brush assembly and the slip ring assembly are required to provide the excitation current for the rotor. The brush assembly is fixed and guides the excitation current to the brush; the slip ring assembly rotates with the rotor, and the slip ring receives the current from the brush and transfers it to the rotor winding to realize rotor excitation. However, the contact surface between the slip ring and the brush will generate a lot of heat due to mechanical and electrical losses, which can easily cause damage to the electrically excited motor and affect the life of the electrically excited motor. Utility Model Content

[0003] The present application provides a brush assembly, a motor and a vehicle, which are at least used to solve the cooling problem of the brush assembly.

[0004] In a first aspect, the present application provides a brush assembly, comprising a base, a plurality of brush holders, a plurality of brushes corresponding one to one with the plurality of brush holders, and a cooling member, wherein the base comprises a through hole; the plurality of brush holders are arranged on the surface of the base, and the plurality of brush holders are arranged at intervals on the outer edge of the through hole; the brushes are mounted on the brush holders; and the cooling member is suitable for cooling the brush holders.

[0005] In one embodiment, along the stacking direction of the brush holder and the base, at least a portion of the orthographic projection of the brush holder overlaps with at least a portion of the orthographic projection of the cooling element.

[0006] In one embodiment, the cooling element is disposed inside the base.

[0007] In one embodiment, the cooling member is disposed on the surface of the base, and the cooling member is located between the base and the brush holder.

[0008] In one embodiment, the cooling element is disposed on a side of the brush holder facing away from the base.

[0009] In one embodiment, the cooling member includes a first cooling section, which is arranged around the through hole; along the stacking direction of the brush holder and the base, at least part of the orthographic projection of each brush holder overlaps with at least part of the orthographic projection of the first cooling section.

[0010] In one embodiment, the cooling member includes a plurality of first cooling sections, the plurality of first cooling sections are arranged at intervals around the through hole, and the plurality of first cooling sections correspond one-to-one to the plurality of brush holders.

[0011] In one embodiment, along the stacking direction of the brush holder and the base, at least a portion of the orthographic projection of each brush holder overlaps with at least a portion of the orthographic projection of the corresponding first cooling section.

[0012] In one embodiment, the cooling member further includes a second cooling section, which is arranged around the through hole, and along the stacking direction of the brush holder and the base, at least part of the orthographic projection of each brush holder overlaps with at least part of the orthographic projection of the second cooling section.

[0013] In one embodiment, the cooling member includes a plurality of second cooling sections, the plurality of second cooling sections are arranged at intervals around the through hole, and the plurality of second cooling sections correspond one-to-one to the plurality of brush holders.

[0014] In one embodiment, along the stacking direction of the brush holder and the base, at least a portion of the orthographic projection of the brush holder overlaps with at least a portion of the orthographic projection of the corresponding second cooling section.

[0015] In one embodiment, the first cooling subsection is in communication with the second cooling subsection.

[0016] In one embodiment, the first cooling sub-section includes a plurality of interconnected first sub-channels, and the plurality of first sub-channels are arranged in an interval arrangement and are all arranged around the through hole.

[0017] In one embodiment, the second cooling subsection includes a plurality of interconnected second sub-flow channels, and each of the plurality of second sub-flow channels is connected to at least one of the first sub-flow channels.

[0018] In one embodiment, the base includes a heat dissipation layer, a first insulating layer and a second insulating layer, the heat dissipation layer, the first insulating layer and the second insulating layer together surround the through hole, the first insulating layer and the second insulating layer are respectively arranged on two opposite surfaces of the heat dissipation layer, the cooling element is arranged on the heat dissipation layer, and the first insulating layer and the second insulating layer are both provided with a plurality of the brush holders and a plurality of the brushes.

[0019] In one embodiment, the brush assembly further includes a first positioning portion and an elastic member, wherein the first positioning portion is disposed on the base and located on a side of the brush holder away from the through hole, and the elastic member is connected between the brush and the first positioning portion.

[0020] In one embodiment, the brush assembly further includes a second positioning portion, which is disposed on the base and located on one side of the brush holder, and is used to position a wire electrically connected to the brush.

[0021] In a second aspect, the present application provides a motor, the motor comprising a rotor, a slip ring, and a brush assembly as described in any embodiment of the first aspect, the rotor is provided with a through hole of the brush assembly, the slip ring is sleeved on the rotor, and the brush of the brush assembly is abutted against the slip ring. Alternatively, the motor comprises the brush assembly as described in any embodiment of the first aspect.

[0022] In a third aspect, the present application provides a vehicle, comprising the motor as described in the second aspect.

[0023] In the brush assembly, motor and vehicle of the present application, a cooling member is provided to take away the heat generated at the worn part of the brush and conducted to the brush holder, thereby achieving heat dissipation of the brush assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0025] Figure 1 It is a three-dimensional structural schematic diagram of a brush assembly from a viewing angle provided in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 A front view of the brush assembly is shown;

[0027] Figure 3 is a schematic diagram of a three-dimensional structure of a brush assembly from another perspective provided in an embodiment of the present application;

[0028] Figure 4 yes Figure 2 The schematic cross-sectional structure diagram of the brush assembly shown along line IV-IV;

[0029] Figure 5 It is a schematic structural diagram of a cooling element provided in an embodiment of the present application;

[0030] Figure 6 is a schematic structural diagram of another cooling element provided in an embodiment of the present application;

[0031] Figure 7 It is a structural schematic diagram of another cooling element provided in an embodiment of the present application;

[0032] Figure 8 It is a structural schematic diagram of another cooling element provided in an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of the structure of a cooling element provided in an embodiment of the present application;

[0034] Fig.10 yes Figure 3 A top view of the brush assembly is shown.

[0035] Description of reference numerals:

[0036] Brush assembly-100, base-10, through hole-11, heat dissipation layer-13, first insulating layer-14, first surface-141, second insulating layer-15, second surface-151, brush holder-20, brush-30, cooling element-40, first cooling division-41, second cooling division-42, cooling channel-43, liquid inlet-431, liquid outlet-432, first sub-channel-433, second sub-channel-434, connecting part-50, first positioning part-60a, second positioning part-60b, elastic part-70, wire-80, mounting part-90. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] The following descriptions of the various embodiments are made with reference to the attached drawings to illustrate specific embodiments that may be implemented in the present application. Directional terms mentioned herein, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are intended to better and more clearly describe and understand the present application, rather than to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0040] Please combine Figure 1 and Figure 2The brush assembly 100 includes a base 10, a plurality of brush holders 20, a plurality of brushes 30 corresponding to the plurality of brush holders 20, and a cooling member 40. The base 10 includes a through hole. The plurality of brush holders 20 are arranged on the surface of the base 10, and the plurality of brush holders 20 are arranged at intervals on the outer edge of the through hole 11. The brush 30 is mounted on the brush holder 20. The cooling member 40 is suitable for cooling the brush holder 20.

[0041] The rotor is provided with a through hole 11, the slip ring is sleeved on the rotor, the brush 30 is supported on the slip ring, and the slip ring can rotate along with the rotor. During the rotation of the slip ring, friction between the brush 30 and the slip ring generates heat.

[0042] In the brush assembly 100 , the motor and the vehicle of the present application, the cooling member 40 is provided to take away the heat generated at the worn part of the brush 30 and conducted to the brush holder 20 , thereby achieving heat dissipation of the brush assembly 100 .

[0043] The base 10 can be made of resin material, so that the base 10 has insulation and thermal conductivity. The heat generated by friction between the brush 30 and the slip ring can be conducted to the base 10 through the brush holder to take the heat away, thereby achieving efficient heat dissipation.

[0044] Specifically, the first surface 141 and the second surface 151 of the base 10 are opposite to each other, and the first surface 141 and the second surface 151 are both provided with a plurality of brush holders 20, and each brush holder 20 is correspondingly installed with a brush 30. Among them, the plurality of brushes 30 on the first surface 141 constitute a negative electrode brush, and the plurality of brushes 30 on the first surface 141 are connected to a slip ring; the plurality of brushes 30 on the second surface 151 constitute a positive electrode brush, and the plurality of brushes 30 on the second surface 151 are connected to another slip ring.

[0045] The multiple brush holders 20 on the first surface 141 and the multiple brush holders 20 on the second surface 151 are arranged and distributed along the circumference of the through hole 11 and are located at the edge of the through hole 11 .

[0046] The brush holder 20 is connected and fixed to the base 10 . The brush holder 20 can be integrated with the base 10 , which reduces the production process and effectively reduces the material cost. It can also reduce the risk of poor insulation between the brush holder 20 and the base 10 and enhance the heat dissipation capacity of the brush assembly 100 .

[0047] Please combine Figure 3 For example, the base 10 includes a heat dissipation layer 13, a first insulating layer 14 and a second insulating layer 15. The heat dissipation layer 13, the first insulating layer 14 and the second insulating layer 15 are collectively arranged to form a through hole 11. The first insulating layer 14 and the second insulating layer 15 are respectively arranged on two opposite surfaces of the heat dissipation layer 13. The cooling member 40 can be arranged on the heat dissipation layer 13. The first insulating layer 14 and the second insulating layer 15 are both provided with a plurality of brush holders 20 and a plurality of brushes 30.

[0048] It can be understood that the first surface 141 of the base 10 is the surface of the first insulating layer 14 facing away from the second insulating layer 15 , and the second surface 151 of the base 10 is the surface of the second insulating layer 15 facing away from the first insulating layer 14 .

[0049] The heat dissipation layer 13 is made of a conductive metal material, and the first insulating layer 14 and the second insulating layer 15 are made of a resin material, so that the first insulating layer 14 and the second insulating layer 15 have insulating properties and thermal conductivity, and can conduct the heat generated by friction between the brush 30 and the slip ring to the heat dissipation layer 13, and then actively take away the heat through the cooling element 40 arranged on the heat dissipation layer 13, thereby greatly shortening the passive heat dissipation path and achieving efficient heat dissipation.

[0050] The first insulating layer 14 and the second insulating layer 15 are provided to cover the heat dissipation layer 13. For example, the first insulating layer 14 and the second insulating layer 15 completely cover the two surfaces of the heat dissipation layer 13 respectively, so that the first insulating layer 14 and the second insulating layer 15 can insulate and protect the heat dissipation layer 13. The first insulating layer 14 and the second insulating layer 15 ensure the insulation withstand voltage requirements at the brush holder 20 and the welding point of the insulated wire 80, thereby reducing the risk of poor insulation.

[0051] For example, along the stacking direction of the brush holder 20 and the base 10, at least part of the orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the cooling member 40. For example, a part of the orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the cooling member 40; for another example, the entire orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the cooling member 40; for another example, the entire orthographic projection of the brush holder 20 overlaps with the entire orthographic projection of the cooling member 40. Preferably, the entire orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the cooling member 40, which can effectively increase the heat exchange area between the brush holder 20 and the cooling member and achieve efficient heat dissipation.

[0052] In one embodiment, the cooling member 40 is disposed inside the base 10. For example, the cooling member 40 may be a thermal pad, a liquid cooling plate, a thermal conductive adhesive, or a flow channel (ie, a flow channel is provided inside the base 10).

[0053] In another embodiment, the cooling member 40 is disposed on the surface of the base 10, and the cooling member 40 is located between the base 10 and the brush holder 20. For example, the cooling member 40 may be a thermal pad, a liquid cooling plate, or a heat dissipation fin.

[0054] In another embodiment, the cooling member 40 is disposed on a side of the brush holder 20 that faces away from the base 10. For example, the cooling member 40 may be a thermal pad, thermal adhesive, or a liquid cooling plate.

[0055] Please combine Figure 4The cooling member 40 includes a first cooling sub-portion 41 disposed around the through hole 11. Along the stacking direction of the brush holder 20 and the base 10, at least part of the orthographic projection of each brush holder 20 overlaps with at least part of the orthographic projection of the first cooling sub-portion 41.

[0056] The first cooling sub-portion 41 is an annular structure, for example, the first cooling sub-portion 41 is an annular structure with a gap, or the first cooling sub-portion is a closed loop structure.

[0057] Please combine Figure 5 In another embodiment, the cooling member 40 includes a plurality of first cooling sections 41, which are arranged at intervals around the through hole 11, and the plurality of first cooling sections 41 correspond to the plurality of brush holders 20 one by one, that is, each brush holder 20 corresponds to a first cooling section 41. This arrangement makes the cooling effect of each brush holder 20 more uniform, so that the heat dissipation effect at each brush 30 is as consistent as possible. In addition, the arrangement of the cooling section between two adjacent brush holders 20 is saved, which can effectively save costs.

[0058] Further, along the stacking direction of the brush holder 20 and the base 10, at least part of the orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the corresponding first cooling subdivision 41, for example, a part of the orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the corresponding first cooling subdivision 41; for another example, the entire orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the corresponding first cooling subdivision 41; for another example, the entire orthographic projection of the brush holder 20 overlaps with the entire orthographic projection of the corresponding first cooling subdivision 41. Preferably, the entire orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the first cooling subdivision 41, which can effectively increase the heat exchange area between the brush holder 20 and the first cooling subdivision 41 and achieve efficient heat dissipation.

[0059] Please combine Figure 6 In another embodiment, the cooling member 40 includes a first cooling subdivision 41 and a second cooling subdivision 42. The first cooling subdivision 41 and the second cooling subdivision 42 are both arranged around the through hole 11, and the first cooling subdivision 41 is connected to the second cooling subdivision 42. For example, the first cooling subdivision 41 is located at the edge of the through hole 11, and the second cooling subdivision 42 is arranged on the side of the first cooling subdivision 41 away from the through hole 11; for another example, the second cooling subdivision 42 is arranged at the edge of the through hole 11, and the first cooling subdivision 41 is arranged on the side of the second cooling subdivision 42 away from the through hole 11. Among them, both the first cooling subdivision 41 and the second cooling subdivision 42 can be annular structures, or the first cooling subdivision 41 is annular structure, and the second cooling subdivision 42 is block structure; both the first cooling subdivision 41 and the second cooling subdivision 42 can be block structures.

[0060] Along the stacking direction of the brush holder 20 and the base 10, at least part of the orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the second cooling sub-section 42. For example, a part of the orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the second cooling sub-section 42, and another part of the brush holder 20 overlaps with a part of the orthographic projection of the first cooling sub-section 41; for another example, the entire orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the second cooling sub-section 42; for another example, the entire orthographic projection of the brush holder 20 overlaps with the entire orthographic projection of the second cooling sub-section 42. Wherein, when the entire orthographic projection of the brush holder 20 overlaps with at least part of the second cooling sub-section 42, the first cooling sub-section 41 is used to assist in heat dissipation of the brush holder 20, and the heat conducted to the second cooling sub-section 42 is further dissipated through the first cooling sub-section 41, thereby reducing the influence of the heat at the brush holder 20 on other devices.

[0061] Please combine Figure 7 and Figure 8 Further, the number of the second cooling sub-sections 42 is multiple, and the multiple second cooling sub-sections 42 are arranged around the through hole 11, and the multiple second cooling sub-sections 42 correspond to the multiple brush holders 20. Among them, the number of the first cooling sub-sections 41 can be one, that is, the first cooling sub-section 41 is a ring structure, and the second cooling sub-section 42 is a block structure; or the number of the first cooling sub-sections 41 can be multiple, and the first cooling sub-sections 41 and the second cooling sub-sections 42 are both block structures.

[0062] In the case where there are multiple second cooling subdivisions 42, along the stacking direction of the brush holder 20 and the base 10, at least part of the orthographic projection of the brush holder 20 overlaps with at least part of the orthographic projection of the corresponding second cooling subdivision 42. For example, a part of the orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the corresponding second cooling subdivision 42, and another part overlaps with at least part of the orthographic projection of the first cooling subdivision 41; for another example, the entire orthographic projection of the brush holder 20 overlaps with a part of the orthographic projection of the corresponding second cooling subdivision 42; for another example, the entire orthographic projection of the brush holder 20 overlaps with the entire orthographic projection of the corresponding second cooling subdivision 42.

[0063] Please combine Fig. 9 For example, the cooling member 40 is a cooling channel 43 , and the cooling channel 43 is disposed on the liquid cooling plate or the cooling channel 43 is disposed inside the base 10 .

[0064] The cooling channel 43 includes a liquid inlet 431 and a liquid outlet 432. The liquid inlet 431 is used to input cooling fluid into the cooling channel 43. The cooling fluid flowing through the cooling channel 43 is discharged from the liquid outlet 432, thereby taking away the heat generated between the brush 30 and the slip ring to achieve heat dissipation.

[0065] The cross section of the cooling channel 43 can be set to be circular or toothed to increase the heat exchange area for heat dissipation and improve the heat dissipation effect.

[0066] For example, the brush assembly 100 also includes a connector that cooperates with the liquid inlet 431 and the liquid outlet 432, and the connector is used to connect to an external conduit. The external device provides cooling fluid to the cooling channel 43 through the conduit and the connector connected to the liquid inlet 431. The cooling channel 43 can be water, water containing additives, oil or other coolant, which is then discharged through the connector and the conduit connected to the liquid outlet 432 to achieve forced cooling of the base 10.

[0067] The brush holder 20 disposed on the base 10 corresponds to a portion of the cooling channel 43 in the axial direction of the through hole 11, so that the cooling fluid in the cooling channel 43 passes through the bottom of the brush holder 20, thereby better removing the heat generated between the brush 30 and the slip ring.

[0068] In one embodiment, the cooling channel 43 includes a plurality of first sub-channels 433 that are connected to each other. The plurality of first sub-channels 433 are arranged at intervals and surround the through hole 11. For example, the first cooling subsection 41 includes a plurality of first sub-channels 433 that are connected to each other.

[0069] The first cooling section 41 is composed of a plurality of interconnected first sub-channels 433, which all extend along the circumference of the through hole 11. The plurality of first sub-channels 433 are arranged inside the base 10 in a direction perpendicular to the circumference of the through hole 11. In other words, first sub-channels 433 arranged in a spiral along the circumference of the through hole 11 are formed inside the base 10, so that the cooling effect of the base 10 is more uniform, and the heat dissipation effect at each brush 30 is as consistent as possible. Among them, the first sub-channels 433 can be densely arranged at the position corresponding to the brush holder 20 on the base 10 to increase the heat exchange area and achieve a better cooling effect.

[0070] In another embodiment, the cooling channel 43 further includes a plurality of second sub-channels 434 , and the plurality of second sub-channels 434 are connected to each other and are connected to at least one first sub-channel 433 .

[0071] The plurality of second sub-channels 434 may be connected in series or in parallel; for example, Figure 4 As shown, multiple second sub-channels 434 are connected in parallel, and the cooling fluid input from the liquid inlet 431 flows through the first sub-channel 433 and then flows to the second sub-channel 434. The brush 30 at the brush holder 20 is cooled by the cooling fluid in the second sub-channel 434 and the first sub-channel 433, which is beneficial to improving the heat dissipation performance.

[0072] By disposing a plurality of second sub-channels 434 on the base 10 , the heat exchange area between the brush holder 20 and the cooling channel 43 is increased, thereby improving the heat dissipation performance of the brush 30 at the brush holder 20 .

[0073] Optionally, for the brush assembly 100, the closer to the brush 30, the higher the temperature rise and the greater the need for heat dissipation, so the first sub-channel 433 and / or the second sub-channel 434 can be densely arranged at the brush 30, for example, a grid-shaped structure can be added to the second sub-channel 434 to further increase the heat exchange area, and for example, the channel path can be modified to make it closer to the liquid inlet 431 to ensure better cooling effect.

[0074] Please combine Fig.10 For example, the brush assembly 100 also includes a connecting portion 50, which is used to connect the base 10 to other components in the motor; the connecting portion 50 is provided on the first surface 141 and the second surface 151, and the connecting portion 50 can be made of an insulating thermally conductive material to increase the insulation and heat dissipation functions to enhance the insulation performance of the first insulating layer 14 or the second insulating layer 15, and the heat dissipation performance of the heat dissipation layer 13.

[0075] For example, the brush assembly 100 further includes a first positioning portion 60a and an elastic member 70. The first positioning portion 60a is disposed on the base 10 and located on a side of the brush holder 20 away from the through hole 11. The elastic member 70 is connected between the brush 30 and the first positioning portion 60a.

[0076] Among them, the brush holder 20 is formed with a through hole, and the brush 30 is inserted into the through hole and moves in the through hole; the elastic member 70 elastically abuts between the first positioning portion 60a and the brush 30 to apply elastic force to the brush 30 toward the center of the through hole 11, so that the brush 30 fits tightly on the slip ring located on the rotor, thereby ensuring the stability of the connection between the brush 30 and the slip ring.

[0077] The surface of the brush 30 facing the slip ring is a smooth annular surface. Even if the slip ring rotates at high speed with the rotor and is accompanied by eccentric vibration within a controllable range, the brush 30 can maintain continuous and uninterrupted mechanical contact with the slip ring, so that after the external current is connected to the brush 30, the current is transmitted to the slip ring due to the close and continuous connection between the brush 30 and the slip ring. The slip ring is a good conductor of electricity. The slip ring conducts the current to the destination where the current flows, such as the rotor winding, through the wire 80 built into the shaft.

[0078] The distribution of the brush holders 20 can be determined according to the position and use direction of the brush 30 .

[0079] For example, the brush assembly 100 further includes a second positioning portion 60 b , which is disposed on the base 10 and located at one side of the brush holder 20 . The second positioning portion 60 b is used to position a wire 80 electrically connected to the brush 30 .

[0080] The two ends of the wire 80 are connected to the brush 30 and the external power supply device respectively. The brush 30 transmits the current input by the wire 80 to the slip ring through the sliding contact between the brush 30 and the slip ring, thereby transmitting the current to the rotating rotor. In addition, the conductive function of the brush holder 20 is eliminated, and the conductive wire 80 is used to conduct electricity to the brush 30, which is conducive to reducing the risk of poor insulation.

[0081] The outer contour of the brush holder 20 is a rectangle, and the second positioning portion 60b and the first positioning portion 60a can be arranged on the same side of the brush holder 20, or on different sides of the brush holder 20. For example, the first positioning portion 60a is arranged on the side of the brush holder 20 away from the through hole 11, and the second positioning portion 60b is arranged on the other side of the brush holder 20.

[0082] The first positioning portion 60a and the second positioning portion 60b are both fixed on the base 10. The first positioning portion 60a, the second positioning portion 60b and the base 10 can be integrated into one, which reduces the production process and ensures the stability of the connection. The first positioning portion 60a and the second positioning portion 60b integrate the heat dissipation function of the base 10, which is beneficial to enhance the heat dissipation capacity.

[0083] The first positioning portion 60a, the second positioning portion 60b and the base 10 are an integrally formed structure made of resin material, so that the first positioning portion 60a, the second positioning portion 60b and the base 10 are all insulators, reducing the risk of poor insulation.

[0084] The second positioning parts 60b are provided to arrange and position the externally connected wires 80 so that the wires 80 do not swing randomly. The number and position of the second positioning parts 60b match the brushes 30 to arrange and position the wires 80 at each brush 30.

[0085] For example, the brush assembly 100 further includes a mounting portion 90, and the first surface 141 and the second surface 151 of the base 10 are both provided with the mounting portion 90, and the mounting portion 90 is located at the corner of the base 10, and the mounting portion 90 is used to connect and fix the base 10 with other structures in the motor. Among them, the mounting portion 90 on the first surface 141 is connected and fixed to the first insulating layer 14, and the mounting portion 90 on the second surface 151 is connected and fixed to the second insulating layer 15, and the mounting portion 90 may not be connected to the heat dissipation layer 13, so as to effectively reduce the influence of the temperature rise between the brush 30 and the slip ring on the motor, and at the same time avoid the temperature rise of other structures inside the motor from affecting the brush 30 and the slip ring. Optionally, the mounting portion 90 may be connected and fixed to the heat dissipation portion to enhance the connection stability between the mounting portion 90 and the base 10.

[0086] In the present application, the mounting portion 90 , the connecting portion 50 , the first positioning portion 60 a and the second positioning portion 60 b are integrated with the base 10 to reduce material costs, reduce production processes, reduce the risk of poor insulation, and enhance the heat dissipation capacity of the brush assembly 100 .

[0087] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A brush assembly, characterized in that: include: a base, including a through hole; A plurality of brush holders are arranged on the surface of the base, and the plurality of brush holders are arranged at intervals on the outer edge of the through hole; A plurality of brushes corresponding to the plurality of brush holders one by one, the brushes being mounted on the brush holders; as well as A cooling member, wherein the cooling member is suitable for cooling the brush holder.

2. The brush assembly according to claim 1, characterized in that: Along the stacking direction of the brush holder and the base, at least a portion of an orthographic projection of the brush holder overlaps with at least a portion of an orthographic projection of the cooling element.

3. The brush assembly according to claim 1, characterized in that: The cooling element is disposed inside the base; or, The cooling member is disposed on the surface of the base, and the cooling member is located between the base and the brush holder; or, The cooling element is arranged on a side of the brush holder away from the base.

4. The brush assembly according to claim 1, characterized in that: The cooling member includes a first cooling section, which is arranged around the through hole; along the stacking direction of the brush holder and the base, at least part of the orthographic projection of each brush holder overlaps with at least part of the orthographic projection of the first cooling section.

5. The brush assembly according to claim 1, characterized in that The cooling member includes a plurality of first cooling sections, the plurality of first cooling sections are arranged at intervals around the through hole, and the plurality of first cooling sections correspond one-to-one to the plurality of brush holders.

6. The brush assembly according to claim 5, characterized in that Along the stacking direction of the brush holder and the base, at least a portion of an orthographic projection of each brush holder overlaps with at least a portion of an orthographic projection of a corresponding first cooling section.

7. The brush assembly according to claim 4, characterized in that The cooling member also includes a second cooling section, which is arranged around the through hole. Along the stacking direction of the brush holder and the base, at least part of the orthographic projection of each brush holder overlaps with at least part of the orthographic projection of the second cooling section.

8. The brush assembly according to claim 5, characterized in that The cooling member includes a plurality of second cooling sections, the plurality of second cooling sections are arranged at intervals around the through hole, and the plurality of second cooling sections correspond one-to-one to the plurality of brush holders.

9. The brush assembly according to claim 8, characterized in that Along the stacking direction of the brush holder and the base, at least a portion of an orthographic projection of the brush holder overlaps with at least a portion of an orthographic projection of the corresponding second cooling sub-portion.

10. The brush assembly according to claim 8 or 9, characterized in that: The first cooling subsection is in communication with the second cooling subsection.

11. The brush assembly according to claim 7, characterized in that The first cooling sub-section includes a plurality of interconnected first sub-channels, and the plurality of first sub-channels are arranged in intervals and are all arranged around the through hole.

12. The brush assembly according to claim 11, characterized in that The second cooling subsection includes a plurality of interconnected second sub-flow channels, and each of the plurality of second sub-flow channels is connected to at least one of the first sub-flow channels.

13. The brush assembly according to claim 1, characterized in that The base includes a heat dissipation layer, a first insulating layer and a second insulating layer, the heat dissipation layer, the first insulating layer and the second insulating layer together surround the through hole, the first insulating layer and the second insulating layer are respectively arranged on two opposite surfaces of the heat dissipation layer, the cooling element is arranged on the heat dissipation layer, and the first insulating layer and the second insulating layer are both provided with a plurality of the brush holders and a plurality of the brushes.

14. The brush assembly according to claim 1, characterized in that The brush assembly further comprises a first positioning portion and an elastic member, wherein the first positioning portion is arranged on the base and located at a side of the brush holder away from the through hole, and the elastic member is connected between the brush and the first positioning portion.

15. The brush assembly according to claim 1, characterized in that The brush assembly further comprises a second positioning portion, which is arranged on the base and located at one side of the brush holder, and is used for positioning a wire electrically connected to the brush.

16. A motor, characterized in that: The motor comprises a rotor, a slip ring and a brush assembly as claimed in any one of claims 1 to 15, wherein the rotor is provided with a through hole of the brush assembly, the slip ring is sleeved on the rotor, and the brush of the brush assembly is in sliding contact with the slip ring; or, the motor comprises the brush assembly as claimed in any one of claims 1 to 15.

17. A vehicle, characterized in that: Comprising the motor as claimed in claim 16.

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