CN221151054U - Axially arranged converging component, motor, power assembly and electric system - Google Patents

Abstract

The embodiment of the application provides an axially arranged converging component, a motor, a power assembly and an electric system. The converging assembly comprises an injection molding body and three converging parts of the injection molding body; each confluence piece comprises a main body and a plurality of first connecting parts, wherein the plurality of first connecting parts are respectively connected to the main body and are used for connecting outgoing lines of stator windings of the motor stator, and the plurality of first connecting parts are arranged at intervals along the circumferential direction of the motor stator; the main bodies of the two confluence parts are arranged along the axial direction of the motor stator, the main bodies of the other confluence part and any one of the two confluence parts are arranged in a staggered manner along the radial direction of the motor stator, and the main bodies of the three confluence parts are fixed through injection molding of an injection molding body. The assembly structure is compact and the assembly structure is integrally injection molded, so that the radial size of the motor stator can be reduced on the premise of ensuring reliable electrical insulation performance, the assembly reliability and the welding reliability are improved, and the assembly structure is more suitable for electrical connection of motors with angle outgoing lines.

Description

Axially arranged converging component, motor, power assembly and electric system

Technical Field

The application relates to the technical field of motors, in particular to an axially arranged converging component, a motor, a power assembly and an electric system.

Background

The stator winding of a brushless motor is generally wound in a centralized winding manner of a split iron core. Specifically, a copper wire coil is wound on the teeth of each of the divided core portions, and then the cores are welded and spliced into a shape of a stator. The winding mode can fully utilize the space between the split iron cores, more copper wires can be distributed in the stator slots of the stator, and the slot filling rate is high.

After winding copper wires on the split cores to form coils, the outgoing wires of the coils need to be converged. The current structure for converging is larger in radial size and is not suitable for the miniaturization development of the current motor.

Disclosure of utility model

According to the axially arranged converging component, the motor, the power assembly and the electric system provided by the embodiment of the application, the radial dimension of the motor can be reduced, and the motor is miniaturized.

In a first aspect, the present application provides an axially aligned bus assembly for bus connection of the windings of a stator in an electric machine. The assembly that converges includes a plurality of assemblies that converge and includes injection molding body and three piece that converges, and the injection molding body can be fixed with three piece that converges of moulding plastics. Each of the bus pieces comprises a main body and a plurality of first connecting parts, the plurality of first connecting parts are respectively connected to the main body, the first connecting parts are used for connecting lead wires of a stator winding of the motor stator, which are used for connecting a power supply, and the plurality of first connecting parts are arranged at intervals along the circumferential direction of the motor stator so as to correspondingly connect the lead wires at different positions. The main bodies of the two confluence parts are arranged along the axial direction of the motor stator, and the main bodies of the other confluence part and any one of the two confluence parts are arranged in a staggered manner along the radial direction of the motor stator. The injection molding body wraps the surfaces of the main bodies of the three confluence pieces, and the injection molding body can isolate the main bodies of the three confluence pieces.

The main bodies of the three confluence parts of the confluence assembly are distributed into two layers along the axial direction of the motor stator, and certain axial and radial distances between the structures are kept without interference, so that electric insulation is realized. By the arrangement mode, the space occupied by the bus assembly in radial distribution of the motor stator is reduced, so that the radial size of the bus assembly can be reduced, and the miniaturization of the motor is facilitated. The assembly is compact in structure and integrally injection molded, is convenient to assemble, and can improve the automation rate.

In one possible implementation, the injection molded body includes a first surface and a second surface facing away from each other in an axial direction of the motor stator, the first surface being configured to be secured to a stator core of the motor stator. Each first connecting part protrudes out of the outer peripheral surface of the main body along the radial direction of the motor stator, and the end part of each first connecting part protrudes out of the second surface of the injection molding body along the axial direction of the motor stator. The first connecting part is exposed out of the injection molding body, so that the first connecting part is convenient to connect with the outgoing line of the stator winding.

Each of the bus pieces comprises a second connecting portion, wherein the second connecting portion is used for being connected with a power supply, and particularly used for being connected with one phase of a three-phase power supply. The second connecting parts are connected to the main body and protrude out of the second surface of the injection molding body along the axial direction of the motor stator. When the injection molding body is fixed on the stator core, the second connecting part extends outwards along the circumferential direction of the motor stator, so that the connection of a power supply is facilitated.

In one possible implementation, the motor is a star motor and the assembly further includes a connector for star connection to the stator windings. The connecting piece includes body and a plurality of connecting terminal, and a plurality of connecting terminal connect in the body respectively, and a plurality of connecting terminal are along motor stator's circumference interval arrangement, and connecting terminal is used for connecting motor stator's stator winding's lead-out wire to realize the star of motor and connect. The body of connecting piece and one converging piece are arranged along the axial direction of the motor stator, the body of connecting piece and the main body of the other converging piece are arranged in a staggered way along the radial direction of the motor stator, and the body of connecting piece and the main bodies of the three converging pieces are fixed through injection molding. The body of connecting piece and the main part of wherein two converging pieces are arranged with the layer for the main part of three converging pieces and the body of connecting piece distribute for two-layer along motor stator's axial, reduce the radial dimension of converging subassembly, be favorable to the miniaturized design of motor.

In one possible implementation, each connection terminal protrudes from the outer circumferential surface of the body in the radial direction of the motor stator, and an end portion of each connection terminal protrudes from the second surface of the injection molded body in the axial direction of the motor stator. The connecting terminal is used for connecting an outgoing line of the stator winding for star connection, so that the three-phase winding realizes the star connection through the connecting piece.

The first connection portion and the connection terminal can both be regarded as connection ends of the bus assembly for connecting the lead wires of the stator windings. In one possible implementation, the plurality of first connection portions and the plurality of connection terminals of the three bus bars are arranged at intervals, reducing the risk of short circuits.

In one possible implementation, the end of the first connection portion comprises a recess in the radial direction of the motor, the recess extending through the first connection portion in the axial direction of the motor stator, the recess being adapted to receive the lead-out wire of the stator winding. The grooves provide space for the outgoing lines connected with the stator windings, accommodate deviation of the outgoing lines of the stator windings, and guarantee welding efficiency and reliability.

In one possible implementation, the end portion of the first connecting portion includes two side walls and a bottom wall connected between the two side walls, the two side walls being opposite in the circumferential direction of the motor stator. Along the radial direction of the motor stator, the bottom wall is connected between the two side walls, and the grooves can be formed between the bottom wall and the two side walls.

Possibly, along the radial direction of the motor stator, the bottom wall is connected to the end portions of the two side walls, which are close to the main body, and the bottom wall is connected to the main body, and at this time, the end portion of the first connecting portion is in a Y shape. Or along the radial direction of the motor stator, the bottom wall is connected to the end parts of the two side walls far away from the main body, wherein one side wall is connected to the main body, and at the moment, the end part of the first connecting part is U-shaped. Of course, the end of the connection terminal of the connection member also has the above-described groove, and the shape of the connection terminal may be similar to that of the first connection portion.

In one possible implementation, the injection body includes a plurality of positioning tabs for securing to a stator core of the motor stator. Each positioning lug protrudes along the axial direction of the motor stator in a direction away from the injection molding body, and a plurality of positioning lugs are arranged at intervals along the circumferential direction of the motor stator. The positioning lug can be positioned conveniently and accurately when the bus assembly is assembled, so that the assembly precision is improved, and the assembly difficulty is reduced.

Specifically, along the axial direction of the motor stator, the outer diameter of one end of the positioning lug close to the injection molding body is larger than the outer diameter of one end of the positioning lug far away from the injection molding body. The positioning lug has a certain die drawing angle, which is beneficial to die drawing. When the bus assembly is fixed to the stator core, radial extrusion exists between the positioning lug and the notch of the stator core, so that the connection strength can be improved.

In a second aspect, the present application provides an electrical machine comprising a motor rotor and a motor stator, the motor stator comprising a stator core, a stator winding and any one of the busbar assemblies as provided in the first aspect above. The stator core includes a plurality of core blocks, and every core block includes along the radial relative internal surface of motor and surface, and the internal surface includes at least one breach, and the breach runs through the core block along the axial of motor. The plurality of iron core blocks are spliced in sequence along the circumference of the motor, the inner surfaces of the plurality of iron core blocks are spliced to form a central hole of a motor stator, gaps are spliced to form a stator groove of the motor, and a motor rotor is accommodated in the central hole. The stator winding is wound on the stator core so that part of the stator winding is accommodated in a stator groove of the stator core, and outgoing lines of the stator winding for connecting a power supply are respectively connected with the three bus pieces.

In a third aspect, the present application provides a powertrain, comprising a controller, a speed reducer, and a motor as in any one of the second aspects, wherein a motor shaft of the motor is in driving connection with an input shaft of the speed reducer, and the controller is electrically connected with the motor to control an operating state of the motor. Wherein the speed reducer can be replaced by a speed changer.

In a fourth aspect, the present application provides an electric system, comprising a movable member, a transmission mechanism and a power assembly provided in the third aspect, wherein the power assembly drives the movable member to move through the transmission mechanism.

The technical effects that can be achieved by the second aspect to the fourth aspect are referred to for the description of the technical effects that can be achieved by the corresponding design in the first aspect, and the description of the present application is not repeated here.

Drawings

Fig. 1 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a motor according to an embodiment of the present application;

Fig. 3a is a schematic structural diagram of a motor stator according to an embodiment of the present application;

FIG. 3b is an enlarged detail view at A in FIG. 3 a;

Fig. 4a is a schematic diagram of a wiring manner of a stator winding of a motor according to an embodiment of the present application;

fig. 4b is a schematic diagram of a wiring manner of a stator winding of a motor according to an embodiment of the present application;

Fig. 5a is a schematic structural diagram of a motor stator according to an embodiment of the present application;

Fig. 5b is a schematic structural diagram of an iron core block of a stator core according to an embodiment of the present application;

fig. 5c is a schematic structural diagram of a coil of a stator winding according to an embodiment of the present application;

Fig. 6a is a schematic diagram of a winding manner of a coil of a stator winding according to an embodiment of the present application;

fig. 6b is a schematic diagram of a winding manner of coils of two same branches of a stator winding according to an embodiment of the present application;

Fig. 6c is a schematic diagram of an electrical connection manner of a motor according to an embodiment of the present application;

fig. 6d is a schematic diagram of a winding manner of a stator winding of a motor according to an embodiment of the present application;

fig. 7a is a schematic structural diagram of a motor stator according to an embodiment of the present application;

FIG. 7B is an enlarged detail view at B in FIG. 7 a;

FIG. 8a is a schematic structural diagram of a bus assembly according to an embodiment of the present application;

FIG. 8b is a schematic diagram of a bus assembly according to an embodiment of the present application;

FIG. 8c is an exploded view of a manifold assembly according to an embodiment of the present application;

FIG. 9a is a schematic view of a portion of a bus assembly according to an embodiment of the present application;

FIG. 9b is a schematic view of a portion of a bus assembly according to an embodiment of the present application;

FIG. 9c is a schematic view of a portion of a bus assembly according to an embodiment of the present application;

fig. 10 is a schematic structural view of a bus member of a bus assembly according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a connector of a bus assembly according to an embodiment of the present application.

Detailed Description

The permanent magnet synchronous motor is an existing common motor, the brushless motor can improve the efficiency of the motor in a high-speed area, and the permanent magnet synchronous motor can be applied to a vehicle-mounted motor of an automobile. The stator winding of a brushless motor generally adopts a centralized winding of a split iron core, and outgoing wires after winding of the split iron core need to be converged, and the outgoing wires of each phase winding are welded on corresponding wiring boards. Such a winding method is suitable for the case of a small number of outgoing lines of the stator winding, but has great difficulty when applied to a brushless motor with a large number of outgoing lines and a smaller outer diameter of the stator core. In particular, in operation, it is necessary to join and weld the outgoing lines of all the windings to the wiring board at one end of the stator in the circumferential direction of the stator, and there may be problems as follows: the lead wires at the end parts of the stator are complicated in line crossing, manual operation is needed, and the consistency of the line crossing arrangement positions is poor; the consistency of the positions of the welding ends of the lead wires is poor, and the lead wires are also required to be arranged manually, so that the welding is difficult and the welding is not firm. The motor is difficult to realize mass production during manufacturing production, the production automation degree is low, and the quality of lead wire welding and the reliability of product electrical connection are difficult to ensure.

Based on the above, the embodiment of the application provides an axially arranged confluence assembly, a motor, a power assembly and an electric system, wherein the confluence assembly is used for arranging three confluence parts along the axial direction of a motor stator, so that the radial dimension of the motor can be reduced, the assembly reliability and the welding reliability can be improved, and the axially arranged confluence assembly is more suitable for the electric connection of the motor with an angle outgoing line.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The electric vehicle provided by the embodiment of the application comprises a plurality of electric systems, wherein each electric system drives different movable parts through a motor to realize device action adjustment. The electric system comprises a movable part, a transmission mechanism and a power assembly, wherein the motor belongs to a part of the power assembly, and the power assembly can drive the movable part to act through the transmission mechanism. For different electric systems, an electric machine for converting electric energy into mechanical energy is included. For example, electric vehicles have a brake motor for a brake system, a steering motor for a steering system, and an electric air conditioning compressor motor for an air conditioning system, which are typically permanent magnet synchronous brushless motors.

Taking fig. 1 as an example of an electric vehicle provided in an embodiment of the present application, the electric vehicle includes a steering system for changing or maintaining a traveling direction or a reversing direction of the vehicle. As shown in fig. 1, the electric vehicle includes wheels 3000, a transmission structure 2000, and a steering mechanism 1000, the steering mechanism 1000 corresponds to a power assembly for outputting power, the steering mechanism 1000 is connected to the wheels 3000 through the transmission structure 2000 for steering, and the wheels 3000 correspond to moving members. The steering mechanism 1000 is a power assembly including a motor 100 and a decelerator 200, and the motor 100 is a split core brushless motor. The motor shaft of the motor 100 is rotatably connected with the input shaft of the speed reducer 200, and the output shaft of the speed reducer 200 is in driving connection with the transmission structure 2000. The speed reducer 200 may be a transmission. The powertrain further includes a controller electrically coupled to the motor 100 for adjusting an operating state of the motor 100.

As shown in fig. 2, the motor 100 includes a motor stator 10, a motor rotor 20, a motor shaft 30, and a housing 40. The motor rotor 20 is coaxially fixed on a motor shaft 30, and the motor shaft 30 is in transmission connection with the speed reducer 200. The motor stator 10 is sleeved outside the rotor 30, and the shell 40 is arranged outside the motor stator 10. The motor stator 10 includes a stator core 1 and a stator winding 2 wound around the stator core 1, and is configured such that a magnetic field is formed in a center hole of the stator core 1 by energizing the stator winding 2, and the motor rotor 20 is rotatable around an axial line of the motor shaft 30 in the magnetic field.

With continued reference to the structure of the motor stator 10 shown in fig. 3a, the motor stator 10 includes a stator core 1 and a stator winding 2, the stator core 1 is annular, and the stator winding 2 is wound on the inner side of the stator core 1. In the axial direction of the stator 10, the stator winding 2 includes a plurality of welding ends T. The welding end T is used for connecting phase electricity or converging according to different motor wiring modes.

Fig. 3b shows an enlarged view at a in fig. 3a, the stator winding 2 comprising a plurality of coils 21, each coil 21 comprising the above-mentioned welding terminal T, through which welding terminal T each coil 21 can be connected to the electrical circuit of the electrical machine 100. The welding ends T protrude from the end face of the stator core 1 in the axial direction of the motor stator 10, and each welding end T forms a welding point. The stator core 1 may have a full-round structure or a split structure. Illustratively, the stator core 1 is a split structure, including a plurality of core blocks 11 and an insulating bracket 12, and the plurality of core blocks 11 are spliced and fixed by the insulating bracket 12. Illustratively, the core block 11 and the coil 21 may be insulated from each other by an insulating bracket 12.

In the motor 100 provided by the embodiment of the application, the stator winding 2 includes a plurality of coils 21, and in different motor wiring modes, the connection modes of the plurality of coils 21 are different. Taking a three-phase motor as an example, fig. 4a and 4b illustrate two common motor circuit connection modes. The plurality of coils 21 included in the stator winding 2 of the motor stator 10 are divided into three groups of windings, respectively, a U-phase winding R1 for connecting U-phase electricity, a W-phase winding R2 for connecting U-phase electricity, and a V-phase winding R3 for connecting V-phase electricity. Each phase winding may comprise a leg, which may comprise a plurality of coils 21 connected in series. Each phase winding may also comprise a plurality of parallel branches, each of which may comprise one coil 21 or a plurality of coils 21 connected in series, thereby forming a multi-branch winding.

As shown in fig. 4a, the star-connected three-phase motor is simplified in electrical connection mode, the head end of each phase winding is electrically connected with the corresponding phase, the tail end of each phase winding is electrically connected with the other two phase windings, and the head end of each phase winding is a power supply end. In such an electrically connected motor 100, when each phase winding includes a plurality of coils 21, the coils 21 of the same phase need to be connected in series or parallel, and the ends of each phase winding need to be connected in series to achieve star connection.

The electrical connection mode of the angle joint three-phase motor shown in fig. 4b is simplified and schematically shown, three-phase windings are connected end to end, and the connection position of any two connected windings is used for connecting corresponding phase electricity, and the connection position is a power supply end. In such an electrically connected motor 100, when each phase winding includes a plurality of coils 21, the coils 21 of the same phase need to be converged in series or parallel.

Next, the structure of the stator 10 provided in the embodiment of the present application will be described in detail using the star-connected motor 100 as an example.

Illustratively, as shown in fig. 5a, the stator core 1 of the motor stator 10 is a split core, specifically including a plurality of core blocks 11, and the plurality of core blocks 11 are spliced along the circumferential direction of the motor stator 10 and fixed by an insulating bracket 12 to form the stator core 1. Here, each core block 11 corresponds to one insulating bracket 12, and when the plurality of core blocks 11 are spliced, the plurality of insulating brackets 12 are sequentially connected and fixed along the circumferential direction of the motor stator 10. One core block 11 wound with the coil 21 is separated in the radial direction of the motor stator 10, and each core block 11 includes an inner surface d1 and an outer surface d2 in the radial direction of the motor stator 10, the inner surface d1 and the outer surface d2 being opposite in the radial direction of the motor stator 10. When the plurality of core blocks 11 are spliced in the circumferential direction of the motor stator 10, the inner surface d1 is spliced to form a center hole of the motor stator 10 for accommodating the motor rotor 20. Each core block 11 is correspondingly wound with a coil 21, and the coil 21 and the core blocks 11 can form an independent structural unit. In the manufacturing production of the motor 100, the coil 21 may be correspondingly wound on the core block 11 to obtain an independent structural unit, and then a plurality of independent structural units are sequentially spliced along the circumferential direction of the motor 100 to obtain the motor stator 10 structure shown in fig. 3 a.

Fig. 5b illustrates a structure of one core block 11, and each core block 11 includes notches K at both sides thereof in a circumferential direction of the motor 100, and two notches K penetrate the core block 11 in an axial direction of the motor stator 10. The structure between the two notches K corresponds to a stator tooth, and the coil 21 can be wound on the stator tooth. When the plurality of core blocks 11 are spliced along the circumferential direction of the motor stator 10, the notches K of two adjacent core blocks 11 may be communicated to form one stator slot, and the coil 21 may be partially accommodated in the stator slot. Illustratively, each core block 11 includes a plurality of core pieces 111, the plurality of core pieces 111 being adjacently arranged in the axial direction of the motor stator 10, and the plurality of core pieces 111 may also be considered to be stacked in the axial direction of the motor stator 10. Each core piece 111 includes a yoke 1111 and teeth 1112 having an integral structure, and the teeth 1112 of the plurality of core pieces 111 can form stator teeth of the motor stator 10 after the plurality of core pieces 111 are stacked in the axial direction of the motor stator 10. In each core piece 111, a yoke 1111 extends in the circumferential direction of the motor stator 10, and teeth 1112 protrude toward the center of the motor stator 10 in the radial direction of the motor stator 10. The end of the tooth 1112 remote from the yoke 1111 includes a flange Q that extends in the circumferential direction of the motor stator 10 and protrudes beyond the tooth 1112. The surface of the flange Q facing the axial center of the motor 100 is a part of the inner surface d1 of the core block 11. When the coil 21 is wound around the core block 11, the coil 21 is wound around the stator teeth formed by stacking the teeth 1112 of the core pieces 111, and the coil 21 and the core block 11 are insulated from each other by the insulating holder 12.

Fig. 5c shows a structure of one coil 21, the coil 21 is wound by one wire, and two welding ends T are provided at both ends of each coil 21, and the welding ends T may be used for connecting phase electricity or other coils 21. The coil 21 has a race-track-like shape as a whole, and two welding ends T extend in opposite directions, respectively, in the axial direction of the motor stator 10, for example. It should be appreciated that in some possible implementations, the coils 21 may be either outgoing at both ends or outgoing at one end in the axial direction of the motor stator 10.

Different wire-outlet modes correspond to different motor electrical connection modes and different winding modes of the stator winding 2, so that the welding end T of the coil 21 is used for connecting the coil 21 of the phase or another phase winding, and the welding end T can be regarded as an outgoing line of the phase winding. If each of the split core blocks 11 is wound with a coil 21 in a single tooth, two welding ends T of the coil 21 are used for connecting the coil 21 of the other phase winding and for connecting the phase electricity, respectively, that is, both welding ends T of the coil 21 are lead wires. If the coils 21 on the two core blocks 11 are wound, the two coils 21 are connected in series. One welding end T of the coil 21 is used for connecting phase electricity, the other welding end T is used for connecting one welding end T of the other coil 21, the other welding end T of the other coil 21 is used for connecting the coil 21 of the other phase winding, and two welding ends T of the serial connection rear end parts of the two coils 21 are outgoing lines. The coil 21 is shown in fig. 5c, namely, two iron core blocks 11 are wound continuously, the coil 21 is led out along two axial ends of the motor stator 10, a welding end T of one end is led out and is used for connecting another phase winding coil 21 or star connection, and a welding end T of the other end is used for connecting another coil 21 which is connected in series in phase. In such a connection method of the stator winding 2, the coil 21 is a straight lead wire, and is applicable to the motor 100 having a large number of outgoing lines without any crossover.

Specifically, fig. 6a illustrates a winding manner of the coil 21 on the stator core 1 in the embodiment of the present application. As shown in fig. 6a, the coil 21 is wound by a single wire, and both ends of the coil 21 are welding ends T. In fig. 6a, a shaded box shows one stator tooth 101 of the stator core 1, and two stator slots 102 are respectively provided on both sides of the stator tooth 101 in the circumferential direction of the motor stator 10, the stator slots 102 being exemplified by solid line boxes. The coil 21 is wound on the stator teeth 101 and is led out along the two axial ends of the stator 10, and when the coil 21 is wound on the core block 11, the two welding ends T respectively extend out of the stator core 1 along the axial direction of the stator 10. Along the circumferential direction of the stator 10, each coil 21 includes a first wire group D1 and a second wire group D2 that are opposite, and the first wire group D1 and the second wire group D2 are respectively accommodated in two stator slots 102 on both sides of the stator teeth 101. The first wire set D1 and the second wire set D2 are illustrated with dashed boxes. The number of turns of the first wire set D1 is one more than that of the second wire set D2, and the two welding ends T are respectively connected to the two wires in the first wire set D1. In the coil 21 illustrated in fig. 6a, the number of turns of the first wire set D1 is 3 turns and the number of turns of the second wire set D2 is 2 turns. Such a winding manner of the coil 21 may enable the welding ends T of the coil 21 to be drawn out along both axial ends of the stator 10.

When a plurality of coils 21 are connected to form a stator winding 2, fig. 6b illustrates the connection of two adjacent coils 21 in phase, which two coils 21 are illustratively part of a U-phase winding. As shown in fig. 5b, each coil 21 is led out along both axial ends of the stator 10. One welding end T of one coil 21 is used for connecting U-phase electricity, the other welding end T is connected with one welding end T of the other coil 21 to realize the series connection of the two coils 21, and the other welding end T of the other coil 21 is used for star connection. It should be understood that two adjacent coils 21 shown in fig. 6b may be connected in series to form a coil group, and the two coils 21 may be wound on the stator core 1 by a wire through two-tooth connection, and the two coils 21 may be continuously wound on two adjacent stator teeth by a wire to form the coil group shown in fig. 6 b. When the two coils 21 are individually wound by separate wires, each coil 21 is individually wound on the corresponding stator tooth, the two coils 21 at this time may be connected in series by the bus bar copper.

The motor 100 is a three-phase star motor with 12 slots and 10 stages, two branches connected in parallel, and 12 split core blocks 11 are adopted to splice and form the stator core 1, and each core block 11 is wound with one coil 21. The circuit connection is shown in fig. 6 c. As shown in fig. 6c, each phase winding comprises two parallel branches, each branch comprising two coils 21 in the stator winding 2, one end of each branch being for connection to a power source and the other end being for star connection. Specifically, the U-phase winding includes two parallel branches L1, each branch L1 includes two coils 21a connected in series, and one connection end U1 of each branch L1 is used for star connection, and the other connection end U2 is used for connecting the U-phase power. The V-phase winding comprises two parallel branches L2, each branch L2 comprising two series connected coils 21b, one connection V1 of each branch L2 being for star connection and the other connection V2 being for connection of V-phase electricity. The W-phase winding includes two parallel branches L3, each branch L3 includes two coils 21c connected in series, and one connection end W1 of each branch L3 is used for star connection and the other connection end W2 is used for connecting W-phase electricity. In the motor 100, two coils 21 on the same branch are wound by connecting the coils 21 of two core blocks 11, two connection ends of each branch, namely, the coils 21 are used as welding ends T of outgoing lines, and the whole stator winding 2 has 12 outgoing lines. Specifically, of the 12 lead wires of the stator winding 2, each phase winding has 4 lead wires. For a star motor, 2 outgoing lines in each phase winding need to be star-connected, and the other 2 outgoing lines are used for connecting phase electricity. Illustratively, the 4 outgoing lines of the U-phase are two connection ends U1 and U2, respectively, the 4 outgoing lines of the W-phase are two connection ends W1 and W2, respectively, and the 4 outgoing lines of the V-phase are two connection ends V1 and V2, respectively.

The winding manner of the stator winding 2 of the motor 100 according to the embodiment of the present application may be as shown in fig. 6 d. The stator winding 2 of the motor 100 includes 12 coils 21, the stator core 1 includes 12 stator slots, a stator tooth is formed between any two adjacent stator slots, and each coil 21 is correspondingly wound on one stator tooth. In fig. 6d, the first coil, the second coil, the third coil, the fourth coil, the fifth coil, the sixth coil, the seventh coil, the eighth coil, the ninth coil, the tenth coil, the eleventh coil, and the twelfth coil are 12 coils 21, and the slots 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 are 12 stator slots. Along the circumferential direction of the stator 10, 12 coils are wound on 12 stator teeth in turn, and each coil 21 is partially accommodated in two adjacent stator slots, respectively. As shown in fig. 6d, taking the first coil as an example, the left part of the wire of the first coil is accommodated in the slot 1, and the right part of the wire of the first coil is accommodated in the slot 2. The first coil is wound with one wire as shown in fig. 6a, and the number of turns of the wire of the first coil in the slot 1 is one more than the number of turns of the wire of the first coil in the slot 2, so that the first coil is led out along both axial ends of the stator 10. The two ends of the first coil are welding ends T, one welding end T is used for connecting a twelfth coil of the same branch circuit, and the other welding end T is used for connecting a phase electricity or star connection. Each coil 21 has a similar structure to the first coil, and is configured to be led out along two axial ends of the stator 10, and the welding ends T of all coils 21 for phase-electricity or star connection are located on the same side, and the welding ends T of all coils 21 for connecting the same branch are located on the same side.

In the axial direction of the stator 10, the side on which the welding end T for phase electricity or star connection is located, i.e., the outgoing line of the stator winding 2, can be regarded as the outgoing line end of the stator 10. And the side on which the welding ends T for connecting the coils 21 of the same branch are located is regarded as the non-wire outlet end of the stator 10. Two coils 21 belonging to the same phase and connected in series can be regarded as a coil group, and two ends of the two coils 21 connected in series are respectively used for connecting phase electricity and star connection. In the motor 100 provided by the embodiment of the application, 6 groups of coil groups are shared by three-phase two branches, one outgoing line of each coil group can be connected with a corresponding power supply through a wire throwing or bus copper bar, and the other outgoing line of each coil group can be connected with a bus structure to form a star point. The winding mode and the connection mode of the coils 21 can reduce the short circuit risk caused by bridging of the outgoing lines of the coils 21 between different phases, reduce the length of the crossover, and reduce the resistance value of the crossover. It should be understood that the above description of the corresponding sequence of the coil 21 and the three-phase branches is only an example, and it is only necessary to satisfy the relative positional relationship between the coil 21 and the three-phase branches as shown in fig. 6 c.

In the motor stator 10 of the motor 100, a confluence structure is generally employed to confluence the different coils 21 to achieve star connection or angle connection. The embodiment of the application provides a busbar assembly 4 for realizing a motor 100, wherein the busbar assembly 4 comprises a plurality of metal pieces, the metal pieces can be arranged along the axial direction of the motor 100, and the structural form of the metal pieces of the busbar assembly 4 can be adjusted according to requirements so as to be applied to the motor 100 with star connection or angle connection.

Fig. 7a shows a structure of a motor stator 10 having a bus bar assembly 4 according to an embodiment of the present application, and fig. 7B shows an enlarged detail of B in fig. 7 a. Referring to fig. 7a and 7b together, the motor stator 10 includes a stator core 1, a stator winding 2, a bus bar assembly 4, and a lead 5, the stator winding 2 includes a plurality of coils 21 wound on the stator core 1, each coil 21 having two welding ends T extending in an axial direction of the motor stator 10, one of the welding ends T being a lead wire for connecting the bus bar assembly 4. The side of the busbar assembly 4 facing the stator core 1 includes a plurality of positioning projections 421, and the positioning projections 421 can be in plug-in fit with the insulating holders 12 of the stator core 1, thereby fixing the busbar assembly 4 to the stator core 1. The existence of the positioning lug 421 can facilitate accurate positioning when assembling the confluence component 4, improve the assembly precision and reduce the assembly difficulty. Illustratively, the motor 100 of the embodiment of the present application is a three-phase star motor, and the number of the leads 5 is three, and the three leads 5 are used for connecting the U-phase power, the W-phase power, and the V-phase power, respectively.

Specifically, referring to the structure of the bus assembly 4 shown in fig. 8a and 8b, the bus assembly 4 includes an injection molding body 42, three bus members 41, and a connecting member 43. The injection molding body 42 may be formed by one or more injection molding, and the three bus members 41 and the connecting member 43 may be fixed in one or more injection molding processes, the bus members 41 and the bus members 41 may be isolated from each other and electrically insulated from each other by the injection molding body 42, and the bus members 41 and the connecting member 43 may be isolated from each other and electrically insulated from each other by the injection molding body 42. The material of the injection molding body 42 may be polyphthalamide (PPA) or polyphenylene sulfide (polyphenylene sulfide, PPS). In fig. 8a, the injection molded body 42 encloses a part of the structure of the busbar 41, the busbar 41 only showing a part of the structure. The three bus members 41 are respectively used for connecting the head ends of the three-phase windings, and the head ends of the three-phase windings can be respectively connected with a three-phase power supply through the three bus members 41. The connection 43 is used to connect the ends of the three-phase windings to achieve a star connection of the motor 100.

As shown in fig. 8a and 8b, the injection molded body 42 includes a first surface b1 and a second surface b2 facing away from each other in the axial direction of the motor stator 10, the first surface b1 being for fixing to the stator core 1. The injection molding body 42 further includes a plurality of positioning protrusions 421, and the positioning protrusions 421 facilitate accurate positioning when fixing the bus bar assembly 4 to the stator core 1. Each of the positioning projections 421 is projected in a direction away from the injection body 42 in the axial direction of the motor stator 10, and the plurality of positioning projections 421 are arranged at intervals in the circumferential direction of the motor stator 10. The positioning lug 421 is a part of the injection molding body 42, and when the injection molding body 42 is injection molded and demolded, in order to facilitate demolding of the positioning lugs 421, the radial dimension of the positioning lug 421 near the bottom end of the injection molding body 42 is smaller than the radial dimension of the top end of the injection molding body 42, so that the positioning lug 421 has a certain draft angle. Here, the draft angle refers to the draft angle, that is, the angle between the outer circumferential surface of the positioning projection 421 and the ejection direction. In the injection molding and demolding process of the injection molded body 42 provided by the present application, the demolding direction is the axial direction of the motor 100. Specifically, the positioning protrusion 421 may be shaped such that an outer circumferential surface of the positioning protrusion 421 is disposed at an angle of 1 ° -2 °, for example, 1 °, 1.0 °, 1.3 °, 1.5 °, 1.8 °,2 °, etc., with respect to the axis of the motor 100. In addition, in the structure of the positioning projection 421, when the positioning projection 421 is engaged with the insulating frame of the stator core 1, the positioning projection 421 is pressed against the notch along the radial direction of the motor 100 as the positioning projection 421 is inserted into the notch in the insulating frame along the axial direction of the motor 100, so that the connection strength can be improved.

Further, in connection with the exploded view of the busbar assembly 4 shown in fig. 8c, each busbar 41 includes a main body 411, a plurality of first connection portions 412 and a plurality of second connection portions 413. Each of the first connection portions 412 is connected to the main body 411, the plurality of first connection portions 412 are arranged at intervals along the circumferential direction of the motor stator 10, the first connection portion 412 of each of the bus members 41 protrudes from the outer circumferential surface of the main body 411 in the radial direction of the motor stator 10, and the first connection portion 412 is used for connecting the stator winding 2 as a welding end T of the head end. The second connection portion 413 is connected to the main body 411, and the second connection portion 413 is used for externally connecting one phase of the three-phase power supply. When the injection molding body 42 fixes the three bus bars 41 by injection molding, the injection molding body 42 wraps the main body 411, and the end portion of each first connecting portion 412 protrudes from the second surface b2 of the injection molding body 42 along the axial direction of the motor stator 10, and the second connecting portion 413 of each bus bar 41 protrudes from the second surface b2 of the injection molding body 42 along the axial direction of the motor stator 10.

Illustratively, the main body 411 of each busbar 41 is an arc-shaped open metal ring, and each busbar 41 includes two first connection portions 412, and each first connection portion 412 may be used to connect two welding ends T as outgoing lines of the same phase stator winding 2. The second connection portion 413 of each of the bus bars 41 has a plate shape for connecting phase electricity. Wherein the end of each first connection portion 412 includes a groove C penetrating the first connection portion 412 in the axial direction of the motor stator 10, the groove C being for accommodating the welding end T of the stator winding 2 for use as a lead-out wire. The two first connection portions 412 of each bus bar 41 are correspondingly connected to the two branches of the same phase winding for connecting the connection ends of the phase electricity, and the coils 21 on the two branches can be connected to the corresponding phase electricity through the second connection portions 413 of one bus bar 41. The material of the bus bar 41 may be copper, and the main body 411, the first connection portion 412, and the second connection portion 413 may have an integrated structure and may be formed by sheet metal, bending, or the like. For convenience of illustration, fig. 8a and 8b illustrate only the groove C of one first connection portion 412.

The connection member 43 includes an annular body 43 and a plurality of connection terminals 432, the plurality of connection terminals 432 are connected to the body 431, the plurality of connection terminals 432 are arranged at intervals along the circumferential direction of the motor stator 10, and the plurality of connection terminals 432 protrude from the outer circumferential surface of the body 43 along the radial direction of the motor stator 10. The plurality of connection terminals 432 are used for respectively connecting outgoing lines of the three-phase windings of the motor stator 10, that is, for connecting the other two welding ends T as outgoing lines in each phase winding to achieve star connection. The end of each connection terminal 432 also includes a groove C penetrating the connection terminal 432 in the axial direction of the motor stator 10, the groove C being for accommodating the welding end T of the stator winding 2 for use as a lead-out wire. The material of the connecting piece 43 may be copper, and the body 43 and the plurality of connecting terminals 432 have an integrated structure and may be formed by sheet metal, bending, or the like. For example, the number of connection terminals 432 is 6, and two outgoing lines for star connection of two branches of each phase winding are respectively connected to the two connection terminals, so that the three-phase winding can be star-connected through the connection piece 43. For convenience of illustration, fig. 8a and 8b illustrate only the groove C of one connection terminal 432.

Specifically, the connection of the busbar assembly 4 to the stator winding 2 is exemplarily described in connection with the electrical connection schematic of the motor 100 shown in fig. 6 c. The two branches L1 of the U-phase winding are connected to the two connection ends U2 of the phase electricity and to the two first connection portions 412 of the first busbar 41, respectively, and are connected to the U-phase electricity by the second connection portions 413 of the busbar 41. The two branches L2 of the V-phase winding are connected to the two connection ends u2 of the phase electricity and the two first connection portions 412 of the second bus bar 41, respectively, and the V-phase electricity is connected through the second connection portions 413 of the bus bar 41. The two branches L3 of the W-phase winding are connected to the two connection ends W2 of the phase electricity and the two first connection portions 412 of the third bus bar 41, respectively, and the W-phase electricity is connected through the second connection portions 413 of the bus bar 41. Two branches L1 of the U-phase winding are used for being connected with two connection ends U1 of the star connection and two connection terminals 432 of the connection piece 43 respectively, two branches L2 of the V-phase winding are used for being connected with two other connection ends U1 of the star connection and two connection terminals 432 of the connection piece 43 respectively, and two branches L3 of the W-phase winding are used for being connected with two connection ends W2 of the star connection and two last connection terminals 432 of the connection piece 43 respectively, so that the star connection of the motor 100 is realized.

Referring to fig. 8a and 8b together, when the injection molding body 42 injection-fixes the three bus bars 41 and the connecting members 43, the injection molding body 42 wraps the main body 411 of each bus bar 41 and the main body 431 of the connecting member 43, and the injection molding body 42 isolates any two main bodies 411 from each other and from each other between the main body 411 and the main body 431 to realize insulation. The first connection portion 412 and the second connection portion 413 of each of the bus bars 41 are exposed outside the injection-molded body 42, and the connection terminal 432 of the connection member 43 is exposed outside the injection-molded body 42.

Fig. 9a and 9b show three bus members 41 and connecting members 43 of the bus bar assembly 4 arranged at different angles, and it should be understood that the structures shown in fig. 9a and 9b are fixedly formed based on the injection molding body 42, which corresponds to the structure of the bus bar assembly 4 after hiding the injection molding body 42. Of the three bus bars 41, the main bodies 411 of two bus bars 41 are arranged in the axial direction of the motor stator 10, and the main bodies 411 of the other bus bar 41 are arranged in a staggered manner with any one of the two bus bars 41 in the radial direction of the motor stator 10. The body 431 of the connecting member 43 and the main body 4 of the other bus bar 41 are arranged in a staggered manner in the radial direction of the motor stator 10, that is, the body 431 of the connecting member 43 and the main bodies 411 of two bus bars 41 among the three bus bars 41 are arranged in a staggered manner in the radial direction of the motor stator 10. Specifically, the three main bodies 411 of the bus bar 41 are a first main body 411a, a second main body 411b and a third main body 411c, respectively, where the first main body 411a and the second main body 411b are arranged at intervals along the axial direction of the motor stator 10, and the third main body 411c is illustratively in the same layer as the first main body 411a and is arranged in a staggered manner along the radial direction of the motor stator 10, so that the third main body 411c is also arranged at intervals along the axial direction of the motor stator 10 with the second main body 411 b. The body 431 of the connecting member 43 is layered with the first body 411a and the third body 411c and is arranged in a staggered manner in the radial direction of the motor stator 10.

Fig. 9c shows an arrangement state of the three bus bars 41 and the connecting bars 43 as viewed in the axial direction of the motor stator 10. It is assumed that the body 411 of each of the bus bars 41 and the body 431 of the connection member 43 are arc-shaped. As shown in fig. 9c, the first body 411a, the third body 411c and the body 431 of the connector 43 are arranged in the same layer and are offset in the radial direction of the motor stator 10, the distance H1 between the first body 411a and the axis O of the motor 100 is smaller than the distance H3 between the third body 411c and the axis O of the motor 100, and the distance H3 between the third body 411c and the axis O of the motor 100 is smaller than the distance H4 between the body 431 and the axis O of the motor 100. The third body 411c and the second body 411b are arranged at intervals along the axial direction of the motor stator 10, the distance H2 between the second body 411b and the axis O of the motor 100 is approximately equal to the distance H3 between the third body 411c and the axis O of the motor 100, and the second body 411b shields a part of the third body 411c along the axial direction of the motor stator 10.

Referring to fig. 9a to 9c together, each of the bus members 411 includes two first connection portions 412 and one second connection portion 413, and the distribution structures of the two first connection portions 412 and the one second connection portion 413 on different bus members 411 are different. For the entire bus bar assembly 4, the plurality of first connection portions 412 and the plurality of connection terminals 432 may be regarded as connection ends of the bus bar assembly 4. As shown in fig. 9c, the plurality of connection ends are uniformly spaced apart in the circumferential direction of the motor stator 10 as viewed in the axial direction of the motor stator 10 and do not interfere, maintaining an electrical safety distance. Wherein, the first connection portion 412 is used for connecting the outgoing line of the motor stator winding 2 for connecting phase electricity, the connection terminal 432 is used for connecting the outgoing line of the stator winding 2 for star connection, and the plurality of connection ends of the bus assembly 4 can be more conveniently connected with the outgoing lines of the plurality of coils 21 distributed along the circumferential direction of the motor stator 10 of the stator winding 2.

In the bus bar assembly 4, the three second connection portions 413 of the three bus bars 41 are adjacent to each other to facilitate connection of the three-phase power. The second connection portions 413 connected to the second body 411b and the second connection portions 413 connected to the third body 411c are spaced apart in the radial direction of the motor stator 10, and the distances between the two and the axis O of the motor 100 are approximately equal. The second connection portion 413 connected to the first body 411a and the second connection portion 413 connected to the third body 411c are spaced apart from each other in the radial direction of the motor stator 10 and are offset from each other, and the distances between the second connection portion 413 and the second connection portion are not equal to the axial center O of the motor 100.

As can be seen from the above examples, three main bodies 411 and one body 431 are distributed in two layers in the axial direction of the motor stator 10, and certain axial and radial distances are maintained between the respective structures without interference, thereby achieving insulation. The arrangement between the three bus members 41 and the connecting members 43 shown in fig. 9a to 9c is merely an example, and the gist thereof is that different metal members of the example bus assembly 4 may be arranged in the axial direction of the motor stator 10, thereby reducing the radial dimension of the bus assembly 4. This arrangement reduces the space occupied by the bus bar assembly 4 in the radial direction of the motor stator 10, thereby reducing the radial dimension of the bus bar assembly 4. The bus bar assembly 4 provided by the embodiments of the present application can be considered to be an axially aligned bus bar assembly 4.

Fig. 10 illustrates a structure of one of the bus bars 41, and an end portion of the connection terminal 431 of the connection member 43 is illustratively U-shaped. As shown in fig. 10, two first connection portions 412 of the bus bar 41 are located at both ends of the main body 411, and a second connection portion 413 is located between the two first connection portions 412. The end portion of the first connecting portion 412 includes two side walls 4121 and a bottom wall 4122 connected between the two side walls 4121, the two side walls 4121 are opposite in the circumferential direction of the motor stator 10, and the two side walls 4121 and the bottom wall 4122 enclose the groove C for accommodating the welding end T. In the busbar 41 illustrated in fig. 10, the bottom wall 4122 is connected to the ends of the two side walls 4121 that are away from the main body 411, and one of the side walls 4121 is connected to the main body 411 such that the opening of the groove C is directed toward the axial center of the motor 100 in the radial direction of the motor stator 10. When the bottom wall 4122 is connected to the two side walls 4121 near the end of the main body 411, the bottom wall 4122 or one of the side walls 4121 may be connected to the main body 411, so that the opening of the groove C faces outward away from the axis of the motor 100 in the radial direction of the motor stator 10, and the end of the first connecting portion 412 is Y-shaped.

Fig. 11 illustrates a structure of the connection member 43, and an end portion of the connection terminal 431 of the connection member 43 is illustratively Y-shaped. As shown in fig. 11, 6 connection terminals 432 of the connection member 43 are spaced apart in the circumferential direction of the motor stator 10 and connected to the main body 431. The end of each connection terminal 432 includes a side wall 4321 and a bottom wall 4322 connected between the two side walls 4321, the two side walls 4321 are opposite to each other in the circumferential direction of the motor stator 10, and the two side walls 4321 and the bottom wall 4322 are enclosed to form the groove C for accommodating the welding end T. In the connecting member 43 illustrated in fig. 10, the bottom wall 4322 is connected to the ends of the two side walls 4321 near the body 431, and the bottom wall 4322 is connected to the body 431 such that the opening of the groove C is directed outward away from the axial center of the motor 100 in the radial direction of the motor stator 10. When the bottom wall 4322 is connected to the end portions of the two side walls 4321 away from the body 431, the end portions of the connection terminals 432 are in the U shape shown in the first connection portion 412 in fig. 10, and can be connected to the main body 411 through one of the side walls 4321, so that the opening of the groove C faces the axial center of the motor 100 in the radial direction of the motor stator 10.

In connection with the structures of the first connection portion 412 shown in fig. 10 and the connection terminal 432 shown in fig. 11, the first connection portion 412 and the connection terminal 432 are connected to the welding end T of the stator winding 2 through the groove C, and the end structure of the first connection portion 412 and the end structure of the connection terminal 432 may be the same or different. The presence of the groove C allows the ends of the first connection portion 412 and the connection terminal 432 to have a certain flexibility. The first connection portion 412 and the connection terminal 432 are connection ends of the bus bar assembly 4 for connecting the lead wires of the stator winding 2, each of which includes the groove C. The position of the tail end of the outgoing line of the stator winding 2 will generally have a certain deviation, and the connection end with the groove C can accommodate the deviation, so that the outgoing line of the stator winding 2 can penetrate out of the groove C of the connection end along the axial direction of the motor stator 10. Specifically, the connecting end and the outgoing line are fixedly connected through welding, before welding, the two sides of the groove C of the connecting end can be pre-pressed through the clamp, the groove C clamps the tail end of the outgoing line, the outgoing line is wrapped in the groove C of the connecting end and is not easy to break away, then the outgoing line is welded, the welding efficiency and the welding firmness can be improved, and the welding difficulty can be reduced. Because of the existence of the connecting end groove C, the bus assembly 4 provided by the embodiment of the application is more suitable for electric connection of motors with angle outgoing lines and more suitable for motors with multiple outgoing lines.

In summary, according to the motor 100 provided by the embodiment of the application, the axial-arranged converging component 4 is adopted to converge the wires of the stator winding 2 of the motor stator 10, and the radial dimension of the motor stator 10 can be reduced on the premise of ensuring reliable electrical insulation performance due to the compact structure and the integral injection molding of the converging component 4. In the assembly of the motor 100, it is more convenient and quick, and is also advantageous to implement automated assembly. Of course, the motor 100 provided in the embodiment of the present application may be applied not only to various electric systems of an electric vehicle, but also to the fields of electric systems such as home appliances and industry, and is not illustrated here.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope or spirit of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (13)

1. An axially arranged confluence assembly is characterized by comprising an injection molding body and three confluence pieces of the injection molding body;

Each of the bus pieces comprises a main body and a plurality of first connecting parts, wherein the plurality of first connecting parts are respectively connected to the main body and are used for connecting outgoing lines of stator windings of a motor stator, and the plurality of first connecting parts are arranged at intervals along the circumferential direction of the motor stator;

The main bodies of the two confluence pieces are arranged along the axial direction of the motor stator, the main bodies of the other confluence piece and any one of the two confluence pieces are arranged in a staggered manner along the radial direction of the motor stator, and the main bodies of the three confluence pieces are fixed through injection molding of the injection molding body.

2. The assembly of claim 1, wherein the injection molded body includes first and second surfaces facing away from each other in an axial direction of the motor stator, the first surface for securing to a stator core of the motor stator;

Each first connecting part protrudes out of the outer peripheral surface of the main body along the radial direction of the motor stator, and the end part of each first connecting part protrudes out of the second surface of the injection molding body along the axial direction of the motor stator.

3. The manifold assembly of claim 2, wherein each of the manifold members includes a second connection portion for connecting to a power source;

The plurality of second connecting parts are connected to the main body, and the second connecting parts protrude out of the second surface of the injection molding body along the axial direction of the motor stator.

4. The assembly according to claim 2, wherein the assembly comprises a connector including a body and a plurality of connection terminals respectively connected to the body, the plurality of connection terminals being arranged at intervals along a circumferential direction of the motor stator, the connection terminals being for connecting lead wires of stator windings of the motor stator;

The body of the connecting piece and one of the converging pieces are arranged along the axial direction of the motor stator, the body of the connecting piece and the main body of the other converging piece are arranged in a staggered manner along the radial direction of the motor stator, and the body of the connecting piece and the main bodies of the three converging pieces are fixed through injection molding of the injection molding body.

5. The assembly according to claim 4, wherein each of the connection terminals protrudes from the outer peripheral surface of the body in the radial direction of the motor stator, and an end portion of each of the connection terminals protrudes from the second surface of the injection molded body in the axial direction of the motor stator.

6. The assembly according to claim 4, wherein the plurality of first connection portions and the plurality of connection terminals of the three bus members are arranged at intervals in the circumferential direction of the motor stator.

7. The assembly of claim 1, wherein an end of the first connection portion includes a recess along a radial direction of the motor, the recess extending through the first connection portion along the motor stator, the recess for receiving an outlet of the stator winding.

8. The assembly according to claim 1, wherein an end portion of the first connecting portion includes two side walls and a bottom wall connected between the two side walls, the two side walls being opposed in a circumferential direction of the motor stator;

The bottom wall is connected between the two side walls along the radial direction of the motor stator.

9. The assembly of claim 8, wherein the bottom wall is connected to ends of the two side walls adjacent to the main body in a radial direction of the motor stator, the bottom wall being connected to the main body;

Or, in the radial direction of the motor stator, the bottom wall is connected to the ends of the two side walls away from the main body, wherein one of the side walls is connected to the main body.

10. The bus assembly of any one of claims 1-9 wherein the injection molded body includes a plurality of locating tabs for securing to a stator core of the motor stator;

Each positioning lug protrudes along the axial direction of the motor stator in a direction away from the injection molding body, and a plurality of positioning lugs are arranged at intervals along the circumferential direction of the motor stator;

Along the axial direction of the motor stator, the outer diameter of one end of the positioning lug, which is close to the injection molding body, is larger than the outer diameter of one end of the positioning lug, which is far away from the injection molding body.

11. An electric machine comprising a motor rotor and a motor stator, the motor stator comprising a stator core, a stator winding, and a bus assembly according to any one of claims 1-10;

The stator core comprises a plurality of core blocks, each core block comprises an inner surface and an outer surface which are opposite along the radial direction of the motor, the inner surface comprises at least one notch, and the notch penetrates through the core block along the axial direction of the motor;

The plurality of iron core blocks are spliced in sequence along the circumferential direction of the motor, the inner surfaces of the plurality of iron core blocks are spliced to form a central hole of the motor stator, the gaps are spliced to form a stator groove of the motor stator, and the motor rotor is accommodated in the central hole;

The stator winding is wound on the stator core so that part of the stator winding is accommodated in a stator groove of the stator core, and outgoing lines of the stator winding for connecting a power supply are respectively connected with the three bus pieces.

12. A powertrain comprising a speed reducer or transmission and a motor as claimed in claim 11, the motor shaft of the motor being in driving connection with the input shaft of the speed reducer or transmission.

13. An electric system comprising a moveable member, a transmission mechanism, and the powertrain of claim 12, wherein the powertrain moves the moveable member via the transmission mechanism.