CN216699655U - Busbar assembly, stator assembly, motor and moped - Google Patents

Abstract

The utility model discloses a bus bar component, a stator assembly, a motor and a power-assisted bicycle, wherein the bus bar component comprises an annular support frame, a first bus bar, a second bus bar and a third bus bar, the first bus bar is provided with a first main body part embedded in the annular support frame, the first main body part is provided with a first opening, the second bus bar is provided with a second main body part embedded in the annular support frame, the second main body part is provided with a second opening, the third bus bar is provided with a third main body part and a fourth main body part embedded in the annular support frame, the fourth main body part and the third main body part are provided with a gap along the axial direction of the annular support frame, the first main body part and the second main body part are arranged at intervals along the axial direction of the annular support frame, the first opening and the second opening are arranged in a staggered way along the circumferential direction of the annular support frame, the third main body part is arranged in the first opening, and the fourth main body part is arranged in the second opening, so that the idle space of the first bus bar and the second bus bar can be utilized, the number of layers of the bus bars is reduced, and the axial size of the bus bar assembly is reduced.

Description

Busbar assembly, stator assembly, motor and moped

Technical Field

The utility model relates to the technical field of motors, in particular to a bus bar component, a stator assembly, a motor and a power-assisted bicycle.

Background

In the related art, the same phases of three-phase windings of the motor need to be connected by a bus bar in a bridge connection mode. The existing bus bars are generally of a flat plate-shaped structure, and the bus bars are arranged in an axially overlapped mode, so that the number of bus bar layers of a bus bar assembly is large, an insulating layer is arranged between the bus bars of adjacent layers, one insulating layer can be added when one layer of bus bar is added, the axial size of the bus bar assembly is large, the axial height of a motor stator assembly is high, the axial size of a motor is increased, the size of the motor is increased, and the compatibility and the adaptability of the motor and the whole motor are affected.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention provides a bus bar assembly, which can reduce the number of layers of bus bars, thereby reducing the axial dimension of the bus bar assembly.

The utility model also provides a stator assembly with the bus bar assembly.

The utility model also provides a motor with the stator assembly.

The utility model further provides a power-assisted bicycle with the motor.

A busbar assembly according to an embodiment of the first aspect of the present invention includes:

an annular support frame;

the first bus bar is provided with a first main body part embedded in the annular support frame, and the first main body part extends along the circumferential direction of the annular support frame and is provided with a first opening;

the second bus bar is provided with a second main body part embedded in the annular support frame, and the second main body part extends along the circumferential direction of the annular support frame and is provided with a second opening;

the third bus bar is provided with a third main body part and a fourth main body part, the third main body part and the fourth main body part are electrically connected and embedded in the annular support frame, and a gap is formed between the fourth main body part and the third main body part along the axial direction of the annular support frame;

the first main body part and the second main body part are arranged at intervals along the axial direction of the annular support frame, the first opening and the second opening are arranged in a staggered mode along the circumferential direction of the annular support frame, the third main body part is located at the first opening, and the fourth main body part is located at the second opening.

The busbar assembly according to the embodiment of the first aspect of the utility model has at least the following advantages:

the third main body part of the third bus bar is arranged at the first opening of the first bus bar, and the fourth main body part of the third bus bar is arranged at the second opening of the second bus bar, so that the idle space of the first bus bar and the second bus bar can be effectively utilized, the number of layers of the bus bars is reduced, and the axial size of the bus bar assembly is favorably reduced.

According to some embodiments of the utility model, the gap has a height h in the axial direction of the annular cage, the h satisfying: h is more than or equal to 0.3 mm.

According to some embodiments of the utility model, the third bus bar is further provided with a bending part, and two ends of the bending part are respectively connected with the third main body part and the fourth main body part.

According to some embodiments of the utility model, the third main body portion, the fourth main body portion and the bending portion are integrally formed.

According to some embodiments of the present invention, the bus bar assembly fixes the first bus bar, the second bus bar, and the third bus bar by injection molding, and forms an insulating layer between the adjacent bus bars.

A stator assembly according to an embodiment of the second aspect of the utility model comprises:

a stator assembly;

the busbar assembly of the embodiment of the first aspect of the utility model is mounted at one end of the stator assembly in the axial direction.

The stator assembly according to the embodiment of the second aspect of the utility model has at least the following advantages:

because the bus bar assembly of the embodiment of the first aspect of the utility model is adopted in the stator assembly, the third main body part of the third bus bar is arranged in the first opening of the first bus bar, and the fourth main body part of the third bus bar is arranged in the second opening of the second bus bar, so that the idle space of the first bus bar and the second bus bar can be effectively utilized, the number of layers of the bus bars is reduced, the axial size of the bus bar assembly is favorably reduced, and the axial size of the stator assembly is further reduced.

According to some embodiments of the utility model, the stator assembly includes a plurality of segmented stator cores, and segmented stator windings wound around the segmented stator cores.

According to some embodiments of the utility model at least two of said segmented stator windings between adjacent slots of the in-phase winding are single-wire series windings.

According to some embodiments of the utility model, the cross-section of the windings of the segmented stator winding is square or oval.

According to some embodiments of the utility model, the bus bar assembly is provided with a snap terminal through which the bus bar assembly is snap-connected to the stator assembly.

The motor according to the embodiment of the third aspect of the utility model comprises the stator assembly according to the embodiment of the second aspect of the utility model.

According to the motor of the embodiment of the third aspect of the utility model, at least the following beneficial effects are achieved:

by adopting the stator assembly of the embodiment of the second aspect of the utility model, the bus bar component of the stator assembly can effectively utilize the idle space of the first bus bar and the second bus bar and reduce the number of layers of the bus bars by arranging the third main body part of the third bus bar in the first opening of the first bus bar and arranging the fourth main body part of the third bus bar in the second opening of the second bus bar, thereby being beneficial to reducing the axial size of the bus bar component, further reducing the axial height of the stator assembly, being beneficial to reducing the axial size and the volume of the motor and improving the compatible adaptability of the motor and the whole machine.

According to some embodiments of the utility model, the number of poles of the motor is 2p, the number of slots is Z, and the number of poles and the number of slots satisfy: l Z-2p | ═ 2.

The power-assisted bicycle according to the fourth aspect of the present invention includes the motor according to the third aspect of the present invention.

The moped provided by the embodiment of the fourth aspect of the utility model has at least the following beneficial effects:

due to the adoption of the motor, the volume of the moped is favorably reduced, and the performance of the moped is improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic perspective view of a buss bar assembly according to some embodiments of the present invention;

FIG. 2 is a top schematic view of the buss bar assembly of FIG. 1;

FIG. 3 is a schematic sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 3;

FIG. 5 is a schematic view of the assembly of a bus bar according to some embodiments of the utility model;

fig. 6 is a schematic perspective view of a third bus bar according to some embodiments of the utility model;

FIG. 7 is a schematic perspective view of a stator assembly according to some embodiments of the present invention;

FIG. 8 is an exploded schematic view of a stator assembly according to some embodiments of the utility model;

FIG. 9 is a schematic view of a segmented stator core employing individual windings;

FIG. 10 is an exploded view of a stator assembly in accordance with further embodiments of the present invention;

fig. 11 is a schematic view of a structure in which two segmented stator cores of adjacent slots in phase adopt serial windings.

Reference numerals:

a bus bar assembly 100; a first bus bar 110; a first main body portion 111; a first connection portion 112; a first opening 113; a second bus bar 120; a second body portion 121; a second connecting portion 122; the second opening 123; a third bus bar 130; a third body portion 131; a fourth body portion 132; a bent portion 133; the third connecting portion 134; a gap 135; an annular support frame 140; an insulating layer 141; a three-phase connection terminal 150; a snap terminal 160;

a stator assembly 200; a segmented stator core 210; a segmented stator winding 220; and a terminal 221.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly defined, terms such as set, mounted, connected, assembled, matched and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention by combining the specific contents of the technical solutions.

In the related art, the same phases of three-phase windings of the motor need to be connected by a bus bar in a bridge connection mode. The existing bus bars are generally of a flat plate-shaped structure, the bus bars are arranged in an axial overlapping mode, each bus bar needs to occupy one layer of space independently, the number of bus bar layers of a bus bar assembly is large, insulating layers are arranged between the bus bars of adjacent layers, one insulating layer can be added when one layer of bus bar is added, the axial size of the bus bar assembly is large, the axial height of a motor stator assembly is high, the axial size and the volume of a motor are increased, and the compatibility and the adaptability of the motor and the whole machine are affected.

In order to solve at least one of the above technical problems, the present invention provides a bus bar assembly, which can reduce the number of layers of bus bars, thereby reducing the axial dimension of the bus bar assembly.

Referring to fig. 1 and 2, a busbar assembly 100 according to an embodiment of the first aspect of the present invention includes an annular support frame 140, a first busbar 110, a second busbar 120, and a third busbar 130, but the busbar assembly 100 may include other busbars. The ring support 140 is made of an insulating material, and can play a role of fixing and supporting the first bus bar 110, the second bus bar 120, and the third bus bar 130 and isolating the adjacent bus bars. The ring-shaped support frame 140 is a plastic-coated piece, when the ring-shaped support frame 140 is manufactured, the first bus bar 110, the second bus bar 120, the third bus bar 130 and other bus bars are coated and fixed through an injection molding process, and meanwhile, an insulating layer is formed between the adjacent bus bars, so that the overall structure of the bus bar assembly 100 is more stable, and the adjacent bus bars are enabled to have good insulating performance.

The first bus bar 110, the second bus bar 120, and the third bus bar 130 are made of copper bars or other materials with good electric conductivity, and can perform a bus bar function. Of course, the bus bar assembly 100 generally further includes a three-phase connection terminal 150, the three-phase connection terminal 150 is mounted on the upper end of the ring-shaped support frame 140, the three-phase connection terminal 150 has three connection terminals, one end of each of the three connection terminals is connected to one of the three bus bars, and the other end of each of the three connection terminals is connected to a power supply to supply power to the three-phase winding.

Referring to fig. 5, in particular, the first bus bar 110 is a flat plate structure and includes a first main body portion 111 and a first connecting portion 112, the first main body portion 111 is embedded in the ring-shaped support 140 and extends along a circumferential direction of the ring-shaped support 140, so that the first main body portion 111 is approximately in a semicircular structure, and a first opening 113 is formed between two ends of the first main body portion 111 along the circumferential direction. The first connecting portion 112 is connected to the outer peripheral wall of the first body portion 111, the first connecting portion 112 is used for connecting terminals 221 of the motor stator part winding to be connected together, and the terminals 221 are electrically connected through the first body portion 111, so that a bus function is realized.

Referring to fig. 5, the second bus bar 120 may have the same or similar structure as the first bus bar 110, and includes a second main body portion 121 and a second connecting portion 122, where the second main body portion 121 is embedded in the annular support frame 140 and extends along the circumferential direction of the annular support frame 140, so that the second main body portion 121 has a substantially semicircular structure, and a second opening 123 is formed between two ends of the second main body portion 121 along the circumferential direction. The second connecting portion 122 is connected to the outer peripheral wall of the second main body portion 121, the second connecting portion 122 is used for connecting terminals 221 of another part of windings of the motor stator, and the terminals 221 are electrically connected through the second main body portion 121, so that a bus function is realized.

Referring to fig. 5 and 6, the third bus bar 130 includes a third main body portion 131, a fourth main body portion 132, and a third connecting portion 134 that are electrically connected, the third main body portion 131 and the fourth main body portion 132 are disposed along a circumferential direction of the toroidal support frame 140 and embedded in the toroidal support frame 140, and the third main body portion 131 and the fourth main body portion 132 have a gap 135 in an axial direction of the toroidal support frame 140, so that the third bus bar 130 can span between bus bars of different layers. The third connecting portion 134 may be provided in plurality, part of the third connecting portion 134 is connected to the outer peripheral wall of the third main body portion 131, part of the third connecting portion 134 is connected to the outer peripheral wall of the fourth main body portion 132, the third connecting portion 134 is used for connecting terminals 221 of another part of windings of the motor stator, and the third main body portion 131 and the fourth main body portion 132 enable the part of the terminals 221 to be electrically connected, so as to implement a current collecting function.

Referring to fig. 3 to 5, the first bus bar 110 and the second bus bar 120 are spaced along the axial direction of the ring-shaped supporting frame 140, and are rotationally staggered along the circumferential direction of the ring-shaped supporting frame 140, such that the first opening 113 and the second opening 123 are staggered along the circumferential direction of the ring-shaped supporting frame 140, the third main body portion 131 is disposed in the first opening 113, the fourth main body portion 132 is disposed in the second opening 123, that is, the third main body portion 131 and the first main body portion 111 are located in the same layer, and the fourth main body portion 132 and the second main body portion 121 are located in the same layer, such that the third bus bar 130 can fully utilize the empty space of the first bus bar 110 and the second bus bar 120, and thus the total number of bus bars can be reduced, and since the bus bars of adjacent layers are isolated from each other by the insulating layer 141 formed by the ring-shaped supporting frame 140, the bus bar assembly 100 also reduces one insulating layer 141 at the same time, so that the axial height of the busbar assembly 100 can be effectively reduced.

It can be understood that the third bus bar 130 may further include a plurality of fourth main body portions 132 as required, the plurality of fourth main body portions 132 are sequentially disposed at intervals along the axial direction of the annular support frame 140, and are disposed in a staggered manner along the circumferential direction of the annular support frame 140, so that each fourth main body portion 132 may be disposed at the opening of the corresponding bus bar, and thus the third bus bar 130 may span more layers of bus bars, and make full use of the idle spaces of other bus bars, so as to reduce the axial dimension of the bus bar assembly 100.

Specifically, the same-phase windings of the three-phase windings need to be connected by a bus bar through a bridge, the same-phase bridge connecting bus bar of the existing three-phase windings usually adopts a copper bar with a straight structure, namely, the first or second bus bar 120 is adopted, and at this time, three layers of copper bars are needed to realize the gap bridge connection, however, if the gap bridge connection bus bar of one phase winding adopts the third bus bar 130, the gap bridge connection between the same phase windings of the three phase windings can be realized only by two layers of copper bars, thereby reducing the number of copper bar layers, reducing the thickness T2 of an insulating layer 141 when reducing the thickness T1 of each copper bar layer, thus enabling the axial height of the busbar assembly 100 to be reduced by T, T1+ T2, thereby can effectively reduce the height of stator assembly for motor structure is more compact, has effectively reduced the motor volume, has promoted motor suitability.

It should be noted that, in some embodiments, the number of the first bus bar 110 and the second bus bar 120 may be two or more, and the number of the third bus bar 130 may also be two or more, so that more axial heights of the busbar assembly 100 may be reduced.

Referring to fig. 4, it should be noted that the bus bars of adjacent layers are insulated and isolated by the insulating layer 141, and in order to make the insulating performance between the bus bars of adjacent layers better, the thickness of the insulating layer 141 generally needs to be set to be thicker. To this end, in some embodiments of the present invention, the third main body portion 131 and the fourth main body portion 132 have a height h of the gap 135 in the axial direction of the ring support 140, and h satisfies the following relationship: h is more than or equal to 0.3 mm. Therefore, the height of the gap 135 is high enough, and when the bus bar assembly 100 is manufactured, the insulating layer 141 is formed by injecting the insulating material into the gap 135, so that the insulating layer 141 has a sufficient thickness, and the third bus bar 130 and the adjacent bus bar have good insulating performance, which is beneficial to improving the insulating and voltage-resisting performance of the bus bar assembly 100.

Referring to fig. 6, it can be understood that the third bus bar 130 is further provided with a bent portion 133, the bent portion 133 is disposed along an axial extension of the toroidal support frame 140, or the bent portion 133 is disposed along a direction forming an included angle with an axial direction of the toroidal support frame 140, the included angle is not greater than 90 °, so that the third bus bar 130 is in a Z shape, at this time, the bent portion 133 can be extended to the bus bar on the upper layer by the bus bar on the lower layer, and thus, both ends of the bent portion 133 can be respectively connected to the third main body portion 131 and the fourth main body portion 132 which are located on the adjacent layers.

The bent portion 133, the third body 131, and the fourth body 132 may be integrally formed. For example, when the third bus bar 130 is manufactured, the bent portion 133, the third main body portion 131, and the fourth main body portion 132 may be integrally formed on the copper plate by press molding, so that the connection strength between the bent portion 133, the third main body portion 131, and the fourth main body portion 132 is better, and the processing is more convenient. Of course, the bent portion 133, the third body portion 131, and the fourth body portion 132 may be separately manufactured, and then the bent portion 133, the third body portion 131, and the fourth body portion 132 may be integrally connected by welding or the like.

The third bus bar 130 may connect the fourth body portion 132 and the third body portion 131 by a wire, thereby electrically connecting the fourth body portion 132 and the third body portion 131. For example, both ends of the copper wire are respectively soldered to the fourth body portion 132 and the third body portion 131, so that the third body portion 131 and the fourth body portion 132 located in adjacent layers are electrically connected.

Referring to fig. 7, a stator assembly according to a second embodiment of the present invention includes a stator assembly 200 and a busbar assembly 100 according to a first embodiment of the present invention, wherein the busbar assembly 100 is mounted at one end of the stator assembly 200 in an axial direction. Specifically, the bus bar assembly 100 may be provided with a snap terminal 160 and the like, so that the bus bar assembly 100 may be snap-mounted on the end of the stator assembly 200 through the snap terminal 160, and the mounting and the dismounting are both convenient.

Since the bus bar assembly 100 according to the embodiment of the first aspect of the present invention is adopted in the stator assembly, the bus bar assembly 100 can effectively utilize the empty space of the first bus bar 110 and the second bus bar 120 by disposing the third main body portion 131 of the third bus bar 130 in the first opening 113 of the first bus bar 110 and disposing the fourth main body portion 132 of the third bus bar 130 in the second opening 123 of the second bus bar 120, so as to reduce the number of layers of the bus bars, thereby being beneficial to reducing the axial size of the bus bar assembly 100 and further reducing the axial size of the stator assembly.

It should be noted that, in the related art, the stator assembly 200 generally uses an integral iron core for winding, and the slot fullness rate of the winding is relatively low, which affects the improvement of the power density and performance of the motor. To this end, referring to fig. 8 and 10, in some embodiments of the present invention, the stator assembly 200 is constructed of a plurality of segmented stator cores 210 and segmented stator windings 220 wound on the respective segmented stator cores 210, respectively. According to the embodiment of the utility model, the integral iron core is divided into the plurality of segmented stator iron cores 210, so that the slot filling rate of the winding is improved, and the power density and the performance of the motor are improved.

It is understood that, in the related art, the winding of the stator winding is generally round wire, and a large gap is formed between the round wire and the round wire during winding, so that the slot fill ratio of the winding is low, and when the stator assembly 200 uses a solid core and the winding is performed using the round wire, the slot fill ratio is generally only about 55%. Therefore, referring to fig. 9 and 11, in some embodiments of the present invention, based on the block stator core 210, a wire with a rectangular, square, or oval cross section is used for winding, for example, a flat wire is used for winding, so that a gap between windings can be greatly reduced, a slot filling rate of the winding can be increased to about 77%, and thus, power density and performance of the motor can be further improved without increasing the volume of the motor.

It should be noted that, in the above embodiment, referring to fig. 8 and 9, when each segmented stator core 210 is separately wound, each segmented stator winding 220 has two terminals 221, which results in that there are more terminals 221 of the stator assembly 200, and therefore, more connecting portions are required to be arranged on the busbar assembly 100 to connect with the terminals 221, which results in an increase in the number of layers of busbars, and increases the difficulty of the busbar injection molding process and reduces the injection molding efficiency, thereby increasing the process manufacturing cost of busbars. For this reason, in some embodiments of the present invention, referring to fig. 10 and 11, at least two of the segmented stator windings 220 between adjacent slots of the in-phase winding are single-wire series windings, so that there are only two terminals 221 in total for the two segmented stator windings 220 between adjacent slots of the in-phase winding, thereby greatly reducing the number of the terminals 221 of the stator assembly 200, simplifying the structural design of the bus bar, reducing the number of the welded terminals 221, effectively improving the manufacturing efficiency, and simultaneously providing a sufficient operating space for the welding process, and ensuring the feasibility of the welding process.

Specifically, taking a 12-slot 10-pole motor as an example: if each block stator core 210 is separately wound, each block stator winding 220 has 2 terminals 221, and at this time, the stator assembly 200 has 24 terminals 221 in total, but if the 2 block stator cores 210 of the same-phase adjacent slots are serially wound, that is, the 2 block stator windings 220 between the same-phase adjacent slots are single-wire serial windings, each block stator winding 220 has only 1 terminal 221, and the stator assembly 200 has only 12 terminals 221 in total, it can be seen that, when the 2 block stator windings 220 between the same-phase adjacent slots are single-wire serial windings, the total number of terminals 221 of the stator assembly 200 can be greatly reduced.

In an embodiment of the third aspect of the present invention, there is provided an electric machine comprising a stator assembly in accordance with an embodiment of the second aspect of the present invention.

By adopting the stator assembly according to the embodiment of the second aspect of the present invention, the bus bar assembly 100 of the stator assembly is configured such that the third main body 131 of the third bus bar 130 is disposed in the first opening 113 of the first bus bar 110, and the fourth main body 132 of the third bus bar 130 is disposed in the second opening 123 of the second bus bar 120, so that the free space of the first bus bar 110 and the second bus bar 120 can be effectively utilized, the number of layers of the bus bars is reduced, the axial size of the bus bar assembly 100 is favorably reduced, the axial height of the stator assembly is further reduced, the axial size and the volume of the motor are favorably reduced, and the compatibility between the motor and the whole motor is improved.

It should be noted that, in order to improve the efficiency of the motor, in some embodiments of the present invention, the number of poles of the motor is 2p, the number of slots is Z, and the number of poles and the number of slots satisfy the following formula: l Z-2p | ═ 2. When the pole number and the slot number of the motor meet the formula, the fundamental wave winding coefficient of the motor can obtain a higher value, and each low-order harmonic winding coefficient can obtain a lower value, so that the magnetic load of the motor can be improved, noise and harmonic loss generated by a harmonic magnetic field can be reduced, the efficiency of the motor can be improved, adjacent slots of the same-phase winding can be ensured, and serial winding of a plurality of stator cores 210 can be realized.

In a fourth aspect, the present invention provides a power assisted bicycle comprising the motor of the third aspect of the present invention.

Since the power-assisted bicycle comprises the motor according to the embodiment of the third aspect of the present invention, all the advantages of the motor according to the embodiment of the third aspect of the present invention are also provided, and details are not repeated herein.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (13)

1. A busbar assembly, comprising:

an annular support frame;

the first bus bar is provided with a first main body part embedded in the annular support frame, and the first main body part extends along the circumferential direction of the annular support frame and is provided with a first opening;

the second bus bar is provided with a second main body part embedded in the annular support frame, and the second main body part extends along the circumferential direction of the annular support frame and is provided with a second opening;

the third bus bar is provided with a third main body part and a fourth main body part, the third main body part and the fourth main body part are electrically connected and embedded in the annular support frame, and a gap is formed between the fourth main body part and the third main body part along the axial direction of the annular support frame;

the first main body part and the second main body part are arranged at intervals in the axial direction of the annular support frame, the first opening and the second opening are arranged in a staggered mode in the circumferential direction of the annular support frame, the third main body part is located at the first opening, and the fourth main body part is located at the second opening.

2. The buss bar assembly of claim 1, wherein: the clearance is along the axial height of annular bracing frame is h, h satisfies: h is more than or equal to 0.3 mm.

3. The busbar assembly according to claim 1 or 2, wherein: the third bus bar is further provided with a bending part, and two ends of the bending part are respectively connected with the third main body part and the fourth main body part.

4. The buss bar assembly of claim 3, wherein: the third main body part, the fourth main body part and the bent part are integrally formed.

5. The buss bar assembly of claim 1, wherein: the busbar assembly is used for fixing the first busbar, the second busbar and the third busbar in an injection molding mode, and an insulating layer is formed between the adjacent busbars.

6. A stator assembly, comprising:

a stator assembly;

the busbar assembly according to any one of claims 1 to 5, mounted to one end of the stator assembly in an axial direction.

7. The stator assembly of claim 6, wherein: the stator assembly comprises a plurality of block stator cores and block stator windings arranged on the block stator cores in a winding mode.

8. The stator assembly of claim 7, wherein: at least two of the block stator windings between adjacent slots of the same-phase winding are single-wire series windings.

9. The stator assembly of claim 7, wherein: the cross section of the winding of the block stator winding is square or oval.

10. A stator assembly according to any one of claims 6 to 9, wherein: the busbar assembly is provided with a clamping terminal, and the busbar assembly is clamped in the stator assembly through the clamping terminal.

11. An electrical machine comprising a stator assembly according to any one of claims 6 to 10.

12. The electric machine of claim 11, wherein: the number of poles of the motor is 2p, the number of slots is Z, and the number of poles and the number of slots meet the following conditions: l Z-2p | ═ 2.

13. A power assisted bicycle, comprising an electric motor as claimed in claim 11 or 12.

Images