CN216625419U

CN216625419U - Stator assembly, motor and moped

Info

Publication number: CN216625419U
Application number: CN202123194439.7U
Authority: CN
Inventors: 左亚军; 王洪晓; 周倩云; 刘海量
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-05-27
Anticipated expiration: 2031-12-16

Abstract

The utility model discloses a stator assembly, a motor and a moped, wherein the stator assembly comprises a stator component and a busbar component, the stator component is provided with a plurality of segmented stator cores, and block stator windings wound around the block stator cores, each of the block stator windings having two terminals, a bus bar assembly mounted at one end of the stator assembly in an axial direction, the bus bar assembly having a plurality of bus bars, the bus bars having a plurality of connection portions, wherein the stator assembly is also provided with a gap bridge connecting piece which is connected with each wiring terminal of at least two partitioned stator windings, the connecting parts are correspondingly connected with the rest wiring terminals of the stator assembly one by one, because partial wiring ends are connected through the gap bridge connecting piece, the number of the connecting parts can be reduced, the number of layers of the bus bars is further reduced, the axial size of the bus bar component is reduced, and the axial height of the stator assembly is further reduced. The axial size and the volume of the motor can be reduced, and the compatibility and the adaptability of the motor and the whole machine can be improved.

Description

Stator assembly, motor and moped

Technical Field

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

Background

In the correlation technique, the stator assembly includes busbar subassembly and stator module, and when stator module adopted the piecemeal stator core, single piecemeal stator core was spliced into stator module again around winding respectively, and stator module's wiring end is more this moment, leads to the busbar subassembly to need to set up the more busbar number of piles in order to obtain the busbar connecting terminal of sufficient quantity, however this can increase the injection molding process degree of difficulty of busbar subassembly and reduce the efficiency of moulding plastics to increase the technology manufacturing cost of busbar. In addition, because the insulating layer is arranged between the bus bars of adjacent layers, the insulating layer is added when one layer of bus bar is added, so that the axial size of the bus bar component is larger, the axial height of the stator assembly is higher, the axial size and the volume of the motor are increased, and the compatibility and the adaptability of the motor and the whole machine are influenced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a stator assembly, which can reduce the number of layers of bus bars, further reduce the axial height of the stator assembly, simplify the structure and the manufacturing process of a bus bar component and improve the convenience of manufacturing.

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

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

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

the stator assembly is provided with a plurality of block stator cores and block stator windings wound on the block stator cores, and each block stator winding is provided with two wiring terminals;

the bus bar assembly is arranged at one end of the stator assembly along the axial direction, is provided with a plurality of layers of bus bars, and is provided with a plurality of connecting parts;

the stator assembly is further provided with a gap bridge connecting piece, the gap bridge connecting piece is connected with each wiring terminal of the at least two blocked stator windings, and the connecting parts are connected with the rest wiring terminals of the stator assembly in a one-to-one correspondence mode.

The stator assembly according to the embodiment of the first aspect of the present invention has at least the following advantages:

because the wiring ends of part of the block stator windings are connected through the gap bridge connecting piece, the number of connecting parts of the bus bar assembly for connecting the wiring ends can be reduced, the number of layers of bus bars of the bus bar assembly is further reduced, the axial size of the bus bar assembly is reduced, the axial height of the stator assembly is further reduced, and meanwhile, the number of the connecting parts is reduced due to the reduction of the number of layers of the bus bars, so that the structure and the manufacturing process of the bus bar assembly can be simplified, the convenience for manufacturing the bus bar assembly is improved, and the overall manufacturing cost of the stator assembly is favorably reduced.

According to some embodiments of the utility model, the gap bridge connector is connected to one of the terminals of each of two of the segmented stator windings of adjacent slots in phase.

According to some embodiments of the present invention, the bridge connector is provided with a bridge portion and soldering portions connected to both ends of the bridge portion, the soldering portions being soldered to the terminals.

According to some embodiments of the utility model, the bridge is integrally formed with the weld.

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.

According to some embodiments of the utility model, the busbar assembly further comprises an annular support frame, the busbars comprising a first busbar, a second busbar and a third busbar;

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 which are embedded in the annular support frame and electrically connected, 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.

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 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.

An electric machine according to an embodiment of the second aspect of the utility model comprises a stator assembly according to an embodiment of the first aspect of the utility model.

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

by adopting the stator assembly of the embodiment of the first aspect of the utility model, the stator assembly is connected with the wiring ends of the partial block stator windings through the gap bridge connecting piece, so that the number of the connecting parts of the bus bar components for connecting the wiring ends can be reduced, the number of layers of bus bars of the bus bar components is reduced, the axial height of the stator assembly is favorably reduced, the axial size and the volume of the motor are favorably reduced, and the compatibility and the adaptability of the motor and the whole machine are improved.

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 embodiment of the third aspect of the present invention includes the motor according to the embodiment of the second aspect of the present invention.

The moped provided by the embodiment of the third 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 stator assembly according to some embodiments of the present invention;

FIG. 2 is an exploded view of the stator assembly of FIG. 1;

fig. 3 is a perspective view of a stator assembly according to some embodiments of the present invention;

FIG. 4 is a schematic perspective view of a bridge connector according to some embodiments of the present invention;

FIG. 5 is a schematic perspective view of a buss bar assembly according to some embodiments of the present invention;

FIG. 6 is a top schematic view of the buss bar assembly of FIG. 5;

FIG. 7 is a schematic sectional view A-A of FIG. 6;

FIG. 8 is an enlarged view at B in FIG. 7;

FIG. 9 is a schematic view of the assembly of the bus bar of some embodiments of the present invention;

fig. 10 is a perspective view of a third bus bar according to some embodiments of the utility model.

Reference numerals:

a bus bar assembly 100; a first bus bar 110; a first 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 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; a terminal 221; a bridge connection 230; a bridge section 231; a weld 232.

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 order to solve at least one of the above technical problems, the present invention provides a stator assembly, which can reduce the number of layers of bus bars, reduce the axial size of a bus bar assembly, further reduce the axial height of the stator assembly, simplify the structure and the manufacturing process of the bus bar assembly, and improve the convenience of manufacturing.

Referring to fig. 1 to 2, a stator assembly according to an embodiment of the first aspect of the present invention includes a stator assembly 200 and a busbar assembly 100, where the busbar assembly 100 is mounted and connected to one end of the stator assembly 200 in an axial direction.

Referring to fig. 2 and 3, in particular, the stator assembly 200 is provided with a plurality of segmented stator cores 210, the plurality of segmented stator cores 210 are distributed in a ring shape, each segmented stator core 210 is wound with a segmented stator winding 220, and each segmented stator winding 220 has two terminals 221.

Referring to fig. 5, the bus bar assembly 100 is provided with a plurality of bus bars each having a plurality of connection portions for connecting the terminals 221 of the segmented stator windings 220. The same bus bar connecting portion is used to connect the terminals 221 of the partial segmented stator windings 220 that need to be connected together, so that the partial terminals 221 can be electrically connected, thereby achieving a bus function.

Referring to fig. 1 to 3, stator assembly 200 further includes a bridge connector 230, and bridge connector 230 may be made of copper material, aluminum material, or other conductive material. The bridge connecting member 230 connects one terminal 221 of each of the at least two segmented stator windings 220 by welding or bonding, etc., and the connecting portions are connected to the remaining terminals 221 of the stator assembly 200 in a one-to-one correspondence. For example, the bridge connector 230 may connect the terminals 221 of the two segmented stator windings 220 that need to be connected together, thereby reducing the number of connections and thus the number of bus bars. Of course, it will be appreciated that gap bridge connection 230 may also connect three or more terminals 221 of segmented stator windings 220 that need to be connected together. Specifically, the number of the bridge connecting members 230 may be increased as needed, so that more terminals 221 to be connected together may be connected, and the number of connecting portions may be decreased.

Because the wiring ends 221 of the partial block stator winding 220 are connected through the gap bridge connecting piece 230, the number of connecting parts of the bus bar assembly 100 for connecting the wiring ends 221 can be reduced, the number of layers of bus bars of the bus bar assembly 100 is further reduced, the axial size of the bus bar assembly 100 is reduced, the axial height of the stator assembly is further reduced, meanwhile, the number of the connecting parts is reduced due to the reduction of the number of the layers of the bus bars, the structural complexity of the bus bar assembly 100 is greatly simplified, the difficulty of the plastic coating process of the bus bar assembly 100 is reduced, the manufacturing efficiency of the bus bar assembly 100 is improved, and the overall manufacturing cost of the stator assembly is favorably reduced.

Referring to fig. 3, it can be understood that, in some embodiments of the present invention, the bridge connection member 230 is connected to a terminal 221 of each of the two segmented stator windings 220 of the same-phase adjacent slots, which is required to be connected together, so that the length of the bridge connection member 230 is not too long, which facilitates the connection between the bridge connection member 230 and the terminal 221, and simultaneously reduces the influence of the bridge connection member 230 on other components. In addition, since one bridge connector 230 is connected to only two terminals 221, the structure of the bridge connector 230 is relatively simple, and the bridge connector 230 is convenient to process and manufacture.

Specifically, taking a 12-slot stator assembly as an example, the same-phase adjacent slots of the three-phase winding are connected by using the gap bridge connecting piece 230, so that the number of bus bars is reduced from 4 to 3, and the number of bus bar connecting parts is reduced from 24 to 12, thereby effectively reducing the number of bus bar layers and the number of connecting parts of the bus bar assembly 100.

Referring to fig. 4, it can be understood that, in some embodiments of the present invention, the bridge connecting member 230 is provided with a bridge portion 231 and a welding portion 232, and the bridge portion 231 is an elongated conductor having a certain curvature, so that other terminals 221 that do not need to be connected to the bridge connecting member 230 can be conveniently avoided. Specifically, both ends of the elongated conductor are bent toward the terminals 221 to be connected, and the soldering portions 232 are provided in two and connected to both ends of the bridge portion 231, respectively, so that the soldering portions 232 can be easily soldered to the terminals 221.

It can be understood that the bridge portion 231 and the welding portion 232 can be manufactured in an integrated forming mode, for example, the copper material can be manufactured into the bridge portion 231 and the welding portion 232 integrally through processes such as stamping, bending and the like, so that the connection strength of the welding portion 232 and the bridge portion 231 is better, and the processing is also more convenient. Of course, the bridge portion 231 and the welding portion 232 may be separately manufactured and then welded together.

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%. Referring to fig. 2 and 3, for this reason, in the embodiment of the present invention, on the basis of using the segmented stator core 210, the segmented stator winding 220 is wound by using a wire with a rectangular, square, or oval cross section, for example, a flat wire, so that a gap between windings can be greatly reduced, a slot filling rate of the winding is improved, the slot filling rate can be increased to about 77%, and thus, the power density and performance of the motor can be further improved without increasing the volume of the motor.

Referring to fig. 1, 5 and 6, a bus bar assembly 100 according to an embodiment of the present invention is mounted to one end of a stator assembly 200 in an axial direction. Specifically, the bus bar assembly 100 may be provided with the snap-in terminal 160 and other structures, and the stator assembly 200 is provided with a corresponding snap-in position, so that the bus bar assembly 100 can be snapped in the snap-in position through the snap-in terminal 160 and installed at the end of the stator assembly 200, and the installation and the detachment are both convenient.

Referring to fig. 5 and 9, in particular, the busbar assembly 100 includes an annular support frame 140, a first busbar 110, a second busbar 120, and a third busbar 130, although 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 three-phase connecting terminals 150, the three-phase connecting terminals 150 are mounted on the upper end of the ring-shaped supporting frame 140, the three-phase connecting terminals 150 have three connecting terminals, one ends of the three connecting terminals are respectively connected with the three bus bars in a one-to-one correspondence, and the other ends of the three connecting terminals are connected with a power supply to supply power to the three-phase windings.

Referring to fig. 9, specifically, 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 annular support frame 140 and extends along a circumferential direction of the annular support frame 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 connection portion 112 is connected to the outer circumferential wall of the first body portion 111, the first connection portion 112 is used for connecting the terminals 221 of the partial segmented stator windings 220 of the stator assembly 200, and the terminals 221 are electrically connected through the first body portion 111, so that a bus function is realized.

Referring to fig. 9, 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 circumferential wall of the second body portion 121, the second connecting portion 122 is used for connecting terminals 221 of another part of the segmented stator windings 220 of the stator assembly 200, and the terminals 221 are electrically connected through the second body portion 121, so that a bus function is realized.

Referring to fig. 9 and 10, 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 body portion 131, part of the third connecting portion 134 is connected to the outer peripheral wall of the fourth body portion 132, the third connecting portion 134 is used for connecting terminals 221 of another part of the segmented stator windings 220 of the stator assembly 200, and the third body portion 131 and the fourth 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. 9, in which the first bus bar 110 and the second bus bar 120 are spaced apart from each other in the axial direction of the ring support 140, and are rotationally staggered in the circumferential direction of the ring support 140, such that the first opening 113 and the second opening 123 are staggered in the circumferential direction of the ring support 140, the third main body 131 is disposed in the first opening 113, the fourth main body 132 is disposed in the second opening 123, that is, the third main body 131 and the first main body 111 are located in the same layer, and the fourth main body 132 and the second main body 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, thereby reducing the total number of bus bars, and since the bus bars of adjacent layers are isolated from each other by the insulating layer 141 formed by the ring support 140, the bus bar assembly 100 also reduces one insulating layer 141 at the same time, thereby, the axial height of the bus bar assembly 100 can be effectively reduced, and further, the axial height of the stator assembly can be 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 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 dimensions of the busbar assembly 100 may be reduced.

Referring to fig. 7 and 8, 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 is generally required 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. 10, 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.

Referring to fig. 10, 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.

The bus bar assembly 100 is adopted in the stator assembly, and the bus bar assembly 100 is provided with the third main body part 131 of the third bus bar 130 in the first opening 113 of the first bus bar 110 and the fourth main body part 132 of the third bus bar 130 in the second opening 123 of the second bus bar 120, so that the idle spaces 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 further reduced, the axial size of the bus bar assembly 100 is further reduced, and the axial height of the stator assembly is further reduced.

In an embodiment of the second aspect of the present invention, an electric machine is provided, which includes the stator assembly of the embodiment of the first aspect of the present invention.

By adopting the stator assembly of the embodiment of the first aspect of the utility model, the stator assembly is connected with the wiring ends 221 of the partial block stator windings 220 through the gap bridge connecting piece 230, so that the number of connecting parts of the bus bar assembly 100 for connecting the wiring ends 221 can be reduced, the number of layers of bus bars of the bus bar assembly 100 is further reduced, the axial size of the bus bar assembly 100 is further reduced, the axial height of the stator assembly is further reduced, the axial size and the volume of the motor are reduced, the structure of the motor is more compact, and the compatibility and the adaptability of the motor and the whole motor are 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, and the efficiency of the motor can be improved.

In a fourth aspect, the present invention provides a power-assisted bicycle, which includes the motor of the second aspect of the present invention.

Since the power-assisted bicycle comprises the motor of the embodiment of the second aspect of the present invention, all the beneficial effects of the motor of the embodiment of the second aspect of the present invention are also achieved, and the 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

1. A stator assembly, comprising:

2. The stator assembly of claim 1, wherein: the gap bridge connecting piece is connected to each of the terminals of the two segmented stator windings of the same-phase adjacent slots.

3. The stator assembly of claim 2, wherein: the gap bridge connecting piece is provided with a gap bridge part and welding parts connected to two ends of the gap bridge part, and the welding parts are welded with the wiring ends.

4. The stator assembly of claim 3, wherein: the bridging part and the welding part are integrally formed.

5. The stator assembly of claim 1, wherein: the cross section of the winding of the block stator winding is square or oval.

6. The stator assembly of claim 1, wherein: the busbar assembly is further provided with a clamping terminal, and the busbar assembly is clamped in the stator assembly through the clamping terminal.

7. The stator assembly according to any one of claims 1 to 6, wherein:

the bus bar assembly is also provided with an annular support frame, and the bus bars comprise a first bus bar, a second bus bar and a third bus bar;

8. The stator assembly of claim 7, 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.

9. The stator assembly of claim 7, 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.

10. The stator assembly of claim 7, 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.

11. Electrical machine, comprising a stator assembly according to any of claims 1 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 according to claim 11 or 12.