CN114362409A - Motor, power assembly and moped - Google Patents

Abstract

The invention discloses a motor, a power assembly and a power-assisted bicycle, wherein the motor comprises a shell, a stator assembly and a busbar assembly, a cavity is formed in the shell, a wire passing hole is formed in the shell, the stator assembly is arranged in the cavity and is in interference connection with the inner wall of the shell, the busbar assembly is arranged at one end of the stator assembly along the axial direction and is provided with a three-phase connecting terminal penetrating through the wire passing hole, resin materials are filled between the stator assembly and the shell, the busbar assembly is also provided with a boss seat sealed in the wire passing hole, the three-phase connecting terminal is arranged on the boss seat, the rigidity of the stator assembly can be greatly improved after the resin materials are solidified, the stator assembly is prevented from easily shaking, the vibration noise of the stator assembly can be effectively reduced, and the heat conductivity coefficient of the resin materials is much larger than that of air, so that the heat dissipation performance of the motor is greatly improved, and the efficiency reduction of the motor caused by overhigh temperature is prevented, meanwhile, the line passing hole of the shell can be sealed through the boss seat, and resin materials are prevented from seeping out.

Description

Motor, power assembly and moped

Technical Field

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

Background

In the correlation technique, power assembly mainly includes motor and drive mechanism, installs stator module in the casing of motor, and stator module's rigidity is not enough can cause the vibration noise big, carries out the heat conduction through the air between stator module's stator winding and the motor casing moreover, nevertheless because the coefficient of heat conductivity of air is less, leads to the heat dispersion of motor than poor for the performance efficiency of motor descends, thereby worsens power assembly's output efficiency.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a motor which can reduce vibration noise and improve heat dissipation performance.

The invention also provides a power assembly with the motor.

The invention further provides a power-assisted bicycle with the power assembly.

An electric machine according to an embodiment of the first aspect of the invention comprises:

the cable connector comprises a shell, a connecting piece and a connecting piece, wherein a cavity is formed inside the shell, and the shell is provided with a wire passing hole communicated with the cavity;

the stator assembly is arranged in the cavity and is in interference connection with the inner wall of the shell;

the busbar assembly is arranged in the cavity, is arranged at one end of the stator assembly along the axial direction, and is provided with a three-phase connecting terminal which is arranged in the wire passing hole in a penetrating way and is connected with a power supply;

the stator assembly and the shell are filled with resin materials, the busbar assembly is further provided with a boss seat which is sealed in the wire passing hole, and the three-phase connecting terminal is installed on the boss seat.

The motor according to the embodiment of the first aspect of the invention has at least the following advantages:

through filling resin material between stator module and casing, can promote stator module's rigidity greatly after the resin material solidifies, prevent that stator module from rocking easily, thereby can effectively reduce stator module's vibration noise, and because resin material's thermal conductivity is a lot more than the air, consequently stator module's heat and the inside other heats of motor can pass through resin material and transmit to the casing fast, then give off to the external world through the casing, thereby make the heat dispersion of motor improve greatly, prevent that the motor from causing the decline of efficiency because of the high temperature, can seal the line hole of crossing of casing through the boss seat simultaneously, prevent that resin material from oozing.

According to some embodiments of the invention, the resin material is a thermosetting resin material.

According to some embodiments of the invention, the bus bar assembly comprises:

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 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 invention, 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 invention, 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 invention, the bending portion, the third main body portion and the fourth main body portion are integrally formed.

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

According to some embodiments of the 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: l Z-2p | ═ 2.

The powertrain according to the embodiment of the second aspect of the invention includes the motor according to the embodiment of the first aspect of the invention.

The power assembly according to the embodiment of the second aspect of the invention has at least the following advantages:

the power assembly adopts the motor, and the motor can effectively improve the rigidity of the stator assembly by filling the resin material between the stator assembly and the shell, reduce the vibration noise of the power assembly, effectively improve the heat dissipation performance of the motor, prevent the efficiency reduction of the motor due to overhigh temperature, and be favorable for improving the output efficiency of the power assembly.

The power-assisted bicycle according to the embodiment of the third aspect of the invention comprises the power assembly according to the embodiment of the second aspect of the invention.

The moped provided by the embodiment of the third aspect of the invention has at least the following beneficial effects:

by adopting the power assembly, the performance of the power-assisted bicycle is improved.

Additional aspects and advantages of the invention 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 invention.

Drawings

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

FIG. 2 is a schematic sectional view A-A of FIG. 1;

FIG. 3 is a schematic illustration of a portion of a powertrain according to some embodiments of the present invention;

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

FIG. 5 is a top schematic view of the buss bar assembly of FIG. 4;

FIG. 6 is a schematic cross-sectional view B-B of FIG. 5;

FIG. 7 is an enlarged view at C in FIG. 6;

FIG. 8 is a schematic view of the assembly of a bus bar according to some embodiments of the invention;

fig. 9 is a schematic perspective view of a third bus bar according to some embodiments of the invention;

FIG. 10 is a schematic perspective view of a stator assembly according to some embodiments of the present invention;

FIG. 11 is an exploded schematic view of a stator assembly according to some embodiments of the invention;

FIG. 12 is a schematic view of a segmented stator core employing individual windings;

FIG. 13 is an exploded view of a stator assembly according to further embodiments of the present invention;

fig. 14 is a schematic view of a structure in which two segmented stator cores of adjacent slots in phase use are wound in series.

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 boss base 170;

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

A housing 300; a resin material 310; a wire passing hole 320;

a transmission mechanism 400;

the rotor assembly 500.

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 correlation technique, power assembly mainly includes motor and drive assembly, installs stator module in the casing of motor, and stator module's rigidity is not enough can cause the vibration noise big, carries out the heat conduction through the air between stator module's stator winding and the motor casing moreover, nevertheless because the coefficient of heat conductivity of air is less, leads to the heat dispersion of motor than poor for the performance efficiency of motor descends, thereby worsens power assembly's output efficiency.

In order to solve at least one of the above technical problems, the present invention provides a motor capable of reducing vibration noise and improving heat dissipation performance.

Referring to fig. 1 and 2, an electric machine according to an embodiment of the first aspect of the present invention includes a stator assembly 200, a rotor assembly 500, and a housing 300, wherein a cavity is formed inside the housing 300, the stator assembly 200 is disposed in the cavity and is in interference connection with an inner wall of the housing 300, and the rotor assembly 500 is rotatably mounted in the middle of the stator assembly 200.

When the motor works, the windings of the stator assembly 200 are powered on to generate a rotating magnetic field, the magnetic field acts on the rotor assembly 500 to rotate the rotor assembly 500 relative to the stator assembly 200, and when the rigidity of the stator assembly 200 is insufficient, large vibration noise is easily generated.

Referring to fig. 2, for this reason, in the embodiment of the present invention, the resin material 310 is filled between the housing 300 and the stator assembly 200, so that the resin material 310 is filled in the gap between the housing 300 and the stator assembly 200, and after the resin material 310 is solidified, the rigidity of the stator assembly 200 can be greatly improved, and the stator assembly 200 is prevented from easily shaking, so that the vibration noise of the stator assembly can be effectively reduced.

In addition, the thermal conductivity of the resin material 310 can usually reach 0.2W/(mK) or more, while the thermal conductivity of air at normal temperature is only 0.0267W/(mK). It can be seen that the thermal conductivity of the resin material 310 is much greater than that of air, so that the heat of the stator assembly 200 and other heat inside the motor can be rapidly transferred to the housing 300 through the resin material 310 and then dissipated to the outside through the housing 300, thereby greatly improving the heat dissipation performance of the motor and preventing the motor from efficiency degradation due to over-high temperature.

It can be understood that the resin material 310 is a polymer resin material, and in particular, a thermosetting resin material may be selected, and the thermosetting resin material may better enhance the rigidity of the stator assembly 200 and the heat conduction performance of the motor. Of course, other types of resin materials may be selected, and the present invention is not limited thereto.

Referring to fig. 2, in particular, the motor further includes a busbar assembly 100, the busbar assembly 100 is disposed in the cavity and is installed at one end of the stator assembly 200 along the axial direction, and the busbar assembly 100 and the stator assembly 200 form a stator assembly.

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.

Referring to fig. 2, the bus bar assembly 100 is provided with three-phase connection terminals 150, and the three-phase connection terminals 150 have one end connected to a power source and the other end connected to windings of the stator assembly 200 to supply power to the windings. The outer wall of the case 300 is provided with a wire passing hole 320, and the wire passing hole 320 is communicated with the cavity, so that the three-phase connection terminal 150 can conveniently connect a power supply located outside the case 300 through the wire passing hole 320.

Referring to fig. 2 and 3, when the resin material 310 is poured into the housing 300, a portion of the resin material 310 may seep out from a gap between the three-phase connection terminal 150 and an inner wall of the wire through hole 320, which may cause waste of the resin material 310 and influence on other components.

To this end, in some embodiments of the present invention, the busbar assembly 100 is further provided with a boss base, the three-phase connection terminal 150 is mounted on the boss base 170, and the bottom of the boss base 170 matches the shape of the wire through hole 320, so that the boss base 170 can seal the wire through hole 320 to prevent the resin material 310 from oozing out of the wire through hole 320. Meanwhile, the boss base 170 can well fix the three-phase connection terminal 150, which is beneficial to positioning the three-phase connection terminal 150 and facilitates the opposite insertion installation of the three-phase connection terminal 150 and the electric control board.

Referring to fig. 4 to 8, in particular, the busbar assembly 100 includes an annular support bracket 140, a first busbar 110, a second busbar 120, and a third busbar 130. 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 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. The boss seat is located the upper end of ring support frame 140, and three-phase connecting terminal 150 installs on the boss seat, and three-phase connecting terminal 150 has three connecting terminal, and three connecting terminal's one end is connected with three busbar one-to-one respectively, and three connecting terminal's the other end is connected with the power, supplies power to the three-phase winding.

Referring to fig. 8, 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 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. 8, 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. 8 and 9, 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. 6 to 8, 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 the suitability of motor.

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. 7, it should be noted that the bus bars of adjacent layers are insulated and isolated by an 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. 8 and 9, it can be understood that the third bus bar 130 is further provided with a bent portion 133, the bent portion 133 extends along the axial direction of the ring-shaped support frame 140, or the bent portion 133 extends along a direction forming an included angle with the axial direction of the ring-shaped 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 extend from the bus bar of the next layer to the bus bar of the previous 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 in 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.

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. 10 to 14, 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 invention, 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. 12 and 14, 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. 11 and 12, 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. To this end, referring to fig. 13 and 14, in some embodiments of the present invention, at least two of the segmented stator windings 220 between adjacent slots of the in-phase winding are single-wire series windings, such 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 terminals 221 of the stator assembly 200, thereby simplifying the structural design of the bus bar, reducing the number of 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.

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 second aspect, an embodiment of the invention provides a powertrain including an electric machine according to the first aspect of the invention. Of course, the powertrain further includes a transmission mechanism 400, an electronic control mechanism (not shown), and the like. The motor outputs torque through the transmission mechanism 400, and the electric control mechanism is used for controlling the operation of the motor and the transmission mechanism 400.

By adopting the motor of the embodiment of the first aspect of the invention, the rigidity of the stator assembly can be effectively improved and the vibration noise of the power assembly can be reduced by filling the resin material 310 between the stator assembly and the shell 300, and the heat dissipation performance of the motor can be effectively improved, thereby preventing the efficiency of the motor from being reduced due to overhigh temperature and being beneficial to improving the output efficiency of the power assembly.

In a third aspect, the present invention provides a power assisted bicycle, which includes the power assembly of the second aspect.

Since the power-assisted bicycle comprises the power assembly of the embodiment of the second aspect of the present invention, all the advantages of the power assembly of the embodiment of the second aspect of the present invention are also provided, and detailed description is omitted here.

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 (12)

1. An electric machine, comprising:

the cable connector comprises a shell, a connecting piece and a connecting piece, wherein a cavity is formed inside the shell, and the shell is provided with a wire passing hole communicated with the cavity;

the stator assembly is arranged in the cavity and is in interference connection with the inner wall of the shell;

the busbar assembly is arranged in the cavity, is arranged at one end of the stator assembly along the axial direction, and is provided with a three-phase connecting terminal which is arranged in the wire passing hole in a penetrating way and is connected with a power supply;

the stator assembly and the shell are filled with resin materials, the busbar assembly is further provided with a boss seat which is sealed in the wire passing hole, and the three-phase connecting terminal is installed on the boss seat.

2. The electric machine of claim 1, wherein: the resin material is a thermosetting resin material.

3. The electric machine of claim 1, wherein the bus bar assembly comprises:

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 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.

4. The electric machine of claim 3, 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.

5. The electric machine of claim 3, 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.

6. The electric machine of claim 5, wherein: the bent portion, the third main body portion and the fourth main body portion are integrally formed.

7. The electric machine of claim 1, wherein: the stator assembly comprises a plurality of block stator cores and block stator windings wound on the block stator cores.

8. The electric machine 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 electric machine of claim 7, wherein: the cross section of the winding of the block stator winding is square or oval.

10. The electric machine according to any of claims 1 to 9, characterized in that: 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.

11. A power pack, characterized by comprising an electric machine according to any one of claims 1 to 10.

12. A power assisted bicycle comprising a powertrain as claimed in claim 11.

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