CN116914971A

CN116914971A - Motor stator, motor stator manufacturing method and motor

Info

Publication number: CN116914971A
Application number: CN202311167268.XA
Authority: CN
Inventors: 刘云
Original assignee: Suzhou Shidai Xin'an Energy Technology Co ltd
Current assignee: Suzhou Shidai Xin'an Energy Technology Co ltd
Priority date: 2023-09-11
Filing date: 2023-09-11
Publication date: 2023-10-20

Abstract

The application discloses a motor stator, a manufacturing method of the motor stator and a motor, wherein the motor stator comprises a stator core, stator windings and a coating layer, the stator core comprises a plurality of winding grooves which are arranged at intervals along the circumferential direction of the stator core, the stator windings comprise a plurality of phase windings, each phase winding is inserted into a winding groove corresponding to the stator winding, each phase winding and the groove wall of each phase winding and the winding groove are arranged at intervals through an insulating layer, and the coating layer coats the stator core and the phase windings. According to the motor stator provided by the embodiment of the application, the mutual insulation between the conductors can be realized, and meanwhile, the production efficiency of the motor is improved.

Description

Motor stator, motor stator manufacturing method and motor

Technical Field

The application belongs to the technical field of motor manufacturing, and particularly relates to a motor stator, a motor stator manufacturing method and a motor.

Background

The motor is an electromagnetic device for converting or transmitting electric energy according to the law of electromagnetic induction, and is widely applied to various production machines and equipment driven by motors. The motor mainly comprises a motor stator and a motor rotor, wherein the rotating part of the traction motor during operation is called a motor rotor and mainly aims at generating electromagnetic torque and induced electromotive force; the stationary part during operation is called the motor stator and mainly serves to generate a magnetic field. The motor stator is often composed of a stator core, stator windings and the like, and how to form reliable insulation structures among the stator core, the stator windings and among the windings of the stator windings, and the production efficiency of the motor stator is improved, so that the motor stator becomes an important research topic.

Disclosure of Invention

The embodiment of the application provides a motor stator, a manufacturing method of the motor stator and a motor, which can improve the production efficiency of the motor.

In a first aspect, an embodiment of the present application provides a motor stator, including: the stator core comprises a plurality of winding grooves which are arranged at intervals along the circumferential direction of the stator core; the stator winding comprises a plurality of phase windings which are connected in series, each phase winding is inserted into a winding groove corresponding to the stator winding, each phase winding and each phase winding are arranged at intervals with the groove wall of the winding groove through an insulating layer, each phase winding comprises a first end and a second end, and the first end and the second end are respectively positioned at two sides of the stator core along the axial direction; the coating layer is coated on the stator iron core and the stator winding; and an insulation holder provided at least one of the first end and the second end of the phase windings to maintain a relative position between the phase windings and the stator core.

In some embodiments, the insulation holder comprises a first insulation holder and a second insulation holder, the first insulation holder disposed at a first end of the phase winding and located between the phase winding and the stator core; the second insulating holder is disposed at a second end of the plurality of phase windings and is located between the plurality of phase windings.

In some embodiments, each phase winding includes a plurality of repeating units distributed along a circumferential direction, each repeating unit includes a first connecting portion, a second connecting portion and two embedded portions, the first connecting portion and the second connecting portion are respectively located at two sides of the stator core, the embedded portions are connected with the first connecting portion and the second connecting portion adjacent to each other and embedded in the winding slots, and orthographic projections of the plurality of first connecting portions and the plurality of second connecting portions in an axial direction are alternately distributed along the circumferential direction; the plurality of phase windings include first phase windings, second phase windings and third phase windings that are disposed to be staggered with each other, and a first insulation holder is disposed between the first phase windings and the stator core to insulate the first phase windings from the stator core, and the second insulation holder includes a plurality of second connection portions respectively between the first phase windings and the second phase windings, and between the second connection portions of the second phase windings and the third phase windings.

In some embodiments, the surface of the first insulating holder contacting the first phase winding includes a plurality of first limiting portions, the plurality of first limiting portions cooperating with the plurality of first connecting portions to limit the relative positions of the stator winding and the stator core.

In some embodiments, two surfaces of the second insulating holder in the axial direction include a plurality of second limiting portions and a plurality of third limiting portions, respectively, the plurality of second limiting portions being engaged with the first phase winding or the plurality of second connection portions of the second phase winding, and the plurality of third limiting portions being engaged with the second phase winding and the plurality of second connection portions of the third phase winding to limit the relative positions of the first phase winding, the second phase winding, and the third phase winding.

In some embodiments, the phase windings include a neutral end and an outlet end, the stator windings further include a neutral point connection row having a plurality of connection holes, the neutral ends of the plurality of phase windings being respectively connected to the connection holes and electrically connected to each other through the connection row; the outlet end of the phase winding is exposed out of the coating layer.

In some embodiments, the phase windings are composed of bare copper wire; the insulating layer and the coating layer are integrally formed.

In a second aspect, an embodiment of the present application provides a method for manufacturing a stator of an electric machine, including: assembling a stator core and stator windings, wherein the stator core comprises a plurality of winding grooves which are arranged at intervals along the circumferential direction of the stator core, the stator windings comprise a plurality of phase windings which are connected in series, each phase winding is inserted into a corresponding winding groove and is arranged at intervals with the groove wall of the winding groove, the plurality of phase windings are arranged at intervals, each phase winding comprises at least one of a first end and a second end, the first end and the second end are respectively positioned at two sides of the stator core along the axial direction, and an insulating holder is arranged at the first end and the second end of each phase winding so as to maintain the relative position between the phase windings and the stator core; insulating layers are formed between the windings of each phase and the slot walls of the winding slots, and the stator core and the stator windings are coated to form a coating layer so as to form a motor stator molding.

In some embodiments, the plurality of phase windings includes a first phase winding, a second phase winding, and a third phase winding, and the insulating holders include a first insulating holder and a second insulating holder; assembling the stator core and the stator winding includes: arranging a first insulating holder on the axial end face of a stator iron core; assembling a first phase winding to the stator core, the first phase winding being disposed on a first insulating holder; the second phase winding and the third phase winding are assembled on the stator core, and a second insulating holder is arranged between the first phase winding and the second phase winding, and the second phase winding and the third phase winding are provided with a second insulating holder, so that the first phase winding, the second phase winding and the third phase winding are arranged at intervals.

In some embodiments, assembling the second phase winding and the third phase winding to the stator core includes: fixing a second insulating holder between the second end of the first phase winding and the second end of the second phase winding such that a space is formed between the first end of the first phase winding and the first end of the second phase winding; fixing another second insulating holder between the second end of the second phase winding and the second end of the third phase winding such that a space is formed between the first end of the second phase winding and the first end of the third phase winding; to form a motor stator semifinished holder.

In some embodiments, forming the motor stator molding includes: the insulation layer and the coating layer are formed by injection molding at the gaps and the peripheral surfaces of the elements in the semi-finished product holder of the motor stator, so that the insulation layer and the coating layer are integrally formed, wherein the phase windings are formed by bare copper wires.

In a third aspect, embodiments of the present application provide an electric machine comprising a machine stator as in the first aspect.

According to the motor stator disclosed by the embodiment of the application, the insulating layers are arranged between each phase winding of the stator winding and between each phase winding and the wall of the winding groove of the stator core, the stator core and the stator winding are coated by the coating layers, the relative positions between the phase windings and the stator core are kept by the insulating retainers, so that the insulating structure between each conductor of the motor stator can be realized, the process step of coating the insulating layers on the stator winding in the prior art is replaced, the scrapping probability of the stator winding due to the damage of the insulating layers is reduced, the production efficiency of the motor stator is further improved, and the manufacturing cost of the motor stator is reduced.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings that are needed to be used in the embodiments of the present application will be briefly described, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a stator of an electric machine according to some embodiments of the present application;

fig. 2 is a schematic structural view of an internal structure of a motor stator according to some embodiments of the present application;

FIG. 3 is a schematic view of a neutral connection row of a motor stator according to some embodiments of the application;

fig. 4 is a schematic diagram of a phase winding of a stator winding according to some embodiments of the present application;

FIG. 5 is a schematic view of an example of a first insulating holder according to some embodiments of the present application;

FIG. 6 is a schematic view of another example of a first insulating holder according to some embodiments of the present application;

fig. 7 is a schematic view of an example of a second insulating holder according to some embodiments of the present application;

fig. 8 is a schematic structural view of another example of a second insulating holder according to some embodiments of the present application;

FIG. 9 is a flow chart of a method of manufacturing a stator of an electric motor according to an embodiment of the application;

FIG. 10 is an exemplary flowchart illustrating some of the steps in the flowchart shown in FIG. 9;

fig. 11 is a schematic structural diagram of the motor stator in step S110 in the flowchart shown in fig. 10;

fig. 12 is a schematic structural diagram of the motor stator in step S120 in the flowchart shown in fig. 10;

Fig. 13 is a schematic structural diagram of the motor stator in step S130 in the flowchart shown in fig. 10;

FIG. 14 is an exemplary flowchart illustrating some of the steps in the flowchart shown in FIG. 10;

fig. 15 is a schematic structural diagram of the motor stator in step S131 in the flowchart shown in fig. 14;

fig. 16 is a schematic structural diagram of the motor stator in step S132 in the flowchart shown in fig. 14;

fig. 17 is an exemplary flowchart illustrating some steps in the flowchart shown in fig. 9.

Reference numerals:

100. a motor stator;

1. a stator core; 101. a first face; 11. a wire winding groove; 12. a first insulating holder; 121. a first limit part;

2. a stator winding; 201. a first end; 202. a second end; 21. a phase winding; 21a, a first phase winding; 21b, a second phase winding; 21c, a third phase winding; 210. a repeating unit; 211. a first connection portion; 212. a second connecting portion; 213. an embedding part; 214. a neutral end; 215. a wire outlet end; 22. a second insulating holder; 221. a second limit part; 23. a neutral point connection row; 231. a wire embedding hole;

3. and a coating layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

In the related art, since insulation is required between, for example, a stator core and a stator winding, and a plurality of conductors of a plurality of phase windings of the stator winding during manufacturing of a motor stator, the stator winding is often wound with copper wires coated with an insulation film. However, the applicant has noted that the insulating film, although serving to insulate the conductors of the motor stator from each other, also increases the difficulty in manufacturing the stator winding and increases the manufacturing cost of the stator winding. In addition, the insulating film is also easy to damage in the process of cladding or assembling the stator winding and the stator core, so that the insulation between conductors of the motor stator fails, the manufacturing yield of the motor stator is reduced, and the production efficiency of the motor stator is reduced.

In view of the above, the application provides a motor stator, which is characterized in that insulation layers are arranged between each phase winding of a stator winding and between each phase winding and a winding groove wall of a stator core, and the stator core and the stator winding are coated by coating layers, so that the insulation structure between each conductor of the motor stator can be realized, the process step of coating the insulation layers on the stator winding in the prior art is replaced, the rejection rate of the stator winding due to the damage of the insulation layers is reduced, the production efficiency of the motor stator is further improved, and the manufacturing cost of the motor stator is reduced.

The technical scheme described by the embodiment of the application is suitable for a motor stator, a manufacturing method of the motor stator and a motor comprising the motor stator.

Fig. 1 is a schematic diagram of a motor stator 100 according to some embodiments of the present application. Fig. 2 is a schematic structural view of an internal structure of a motor stator 100 according to some embodiments of the present application. As shown in fig. 1 and 2, the motor stator 100 includes a stator core 1, a stator winding 2, and a coating layer 3.

The stator core 1 includes a plurality of winding grooves 11 provided at intervals along the circumferential direction of the stator core 1. The stator winding 2 includes a plurality of phase windings 21 connected in series, each phase winding 21 is inserted into a corresponding winding slot 11, each phase winding 21 and a slot wall of the winding slot 11 are arranged at intervals by an insulating layer (not shown), each phase winding 21 includes a first end 201 and a second end 202, and the first end 201 and the second end 202 are respectively located at two sides of the stator core 1 along the axial direction. The coating layer 3 coats the stator core 1 and the stator winding 2. An insulating holder is provided at least one of the first end 201 and the second end 202 of the phase winding 21 to hold the relative position between the phase windings 21 and the stator core 1.

The stator core 1 is a main magnetic circuit of the motor stator 100, and is typically formed by laminating silicon steel sheets, the stator core 1 is formed in a ring shape, and the inner wall of the stator core has a plurality of winding grooves 11 arranged at intervals along the circumferential direction, that is, the plurality of winding grooves 11 are equidistantly arranged along the inner ring of the stator core 1. The stator winding 2 is a coil set formed by winding copper wires, and the stator winding 2 may include a plurality of phase windings 21. It is conceivable that the distance of the winding slots 11 in the circumferential direction from each other is related to the design of the phase windings 21 of the stator winding 2. In the embodiment of the present application, the stator winding 2 is a three-phase stacked winding, that is, the stator winding 2 includes three phase windings 21 having the same shape and size, and are embedded in the winding slots 11 in a manner of being stacked one by one and uniformly distributed, so that each phase winding 21 is different in phase by 120 ° in time angle, so as to form a rotating magnetic field required by the electromagnetic circuit to generate the motor.

Alternatively, the stator winding 2 may be wound with bare copper wire, i.e. copper wire whose surface is not covered with an insulating layer. The use of bare copper wire for winding the stator winding 2 can greatly reduce the production cost of the motor stator 100 compared to the use of copper wire coated with an insulating film. In the embodiment of the application, the bare copper wire adopted by the stator winding 2 is a flat wire, and the flat wire is used, so that the motor has smaller volume and better temperature performance under the condition of the same power compared with a round wire.

The insulation layer is disposed between the phase windings 21 and the slot walls of the winding slots 11, that is, the insulation layer is disposed between the phase windings 21 such that the phase windings 21 in the stator winding 2 are insulated from each other, the insulation layer is disposed between the phase windings 21 and the slot walls of the winding slots 11 such that the stator winding 2 and the stator core 1 are insulated from each other, and the insulation layer can play an insulation role at the portions where the phase windings 21 contact each other and the portions where the phase windings 21 contact the winding slots 11. Therefore, the insulating layer can insulate the conductors of the motor stator 100 at the locations where the conductors contact each other.

The coating layer 3 is coated on the stator core 1 and the stator winding 2, that is, while the insulating layer insulates the conductors at the positions where the conductors are in contact with each other, the coating layer 3 can insulate the conductors at the positions where the conductors are not in contact with each other, so that the conductors in the motor stator 100 are completely insulated from each other and are not in contact with the outside, and are prevented from being affected by the external environment.

Alternatively, the insulating layer may be applied or filled in the groove wall of the winding groove 11, or may be formed by injection molding between each phase winding 21 and the winding groove 11. Alternatively, the cladding layer 3 may be formed by injection molding, for example, by placing the assembled stator core 1 and stator winding 2 into a mold and injection molding the inside of the mold, to which the embodiment of the present application is not limited.

Fig. 3 is a schematic view of the structure of the neutral point connection row 23 of the motor stator 100 according to some embodiments of the present application. As shown, in some embodiments of the application, the phase winding 21 includes a neutral end 214 and an outlet end 215. The stator winding 2 further includes a neutral point connection row 23, and the neutral ends 214 of the plurality of phase windings 21 are electrically connected to each other through the neutral point connection row 23. The outlet end 215 of the phase winding 21 is exposed to the cladding 3.

The neutral end 214 is one end at which the plurality of phase windings 21 are connected to each other by a star connection. In the embodiment of the present application, the stator winding 2 is provided with the neutral point connection row 23, the line insertion hole 231 is penetrated through the neutral point connection row 23, the neutral end 214 of the phase winding 21 is penetrated in the line insertion hole 231, and the neutral end 214 of the phase winding 21 and the neutral point connection row 23 are welded to electrically connect the neutral ends 214 of the plurality of phase windings 21 to each other, the neutral point connection row 23 can be regarded as the neutral line of the motor stator 100, and no current passes through the neutral point connection row 23 due to zero current in the neutral line of the balanced three-phase electricity.

The outlet terminals 215, i.e., the outlet lines of the plurality of phase windings 21 at the other end remote from the neutral terminal 214, are three phase lines from which three-phase electricity is drawn. In order to enable the outlet terminal 215 to draw out three-phase electricity, the outlet terminal 215 should be exposed to the coating layer 3.

Referring again to fig. 2, in some embodiments of the present application, the stator core 1 includes a first face 101 and a second face (not shown) that are opposite in the axial direction of the stator core 1. Each phase winding 21 is embedded in the corresponding winding slot 11 of the stator core 1, the first end 201 and the second end 202 in the axial direction correspond to the first face 101 and the second face of the stator core 1 in the axial direction, the first end 201 protrudes from the first face 101, and the second end 202 protrudes from the second face. Thus, the first end 201 of each phase winding 21 includes a plurality of first connection portions 211 extending in the circumferential direction, and the second end 202 includes a plurality of second connection portions 212 extending in the circumferential direction.

Fig. 4 is a schematic diagram of the structure of the phase windings 21 of the stator winding 2 according to some embodiments of the present application. As shown in fig. 4, in some embodiments of the present application, each phase winding 21 includes a plurality of repeating units 210 distributed along the circumferential direction, each repeating unit 210 includes a first connecting portion 211, a second connecting portion 212, and two embedding portions 213, the first connecting portion 211 and the second connecting portion 212 are respectively located at two sides of the stator core 1, and the embedding portions 213 connect the first connecting portion 211 and the second connecting portion 212 adjacent to each other and are embedded in the winding slots.

The phase winding 21 is formed as an arc-shaped coil with both ends not in contact, and is formed by circularly winding a first connection portion 211 connected to an embedded portion 213, the embedded portion 213 connected to a second connection portion 212, the second connection portion 212 connected to the embedded portion 213, and the embedded portion 213 connected to the first connection portion 211 again. The insertion portion 213 extends in the axial direction, is connected between the adjacent first connection portion 211 and second connection portion 212, and is inserted into the winding groove 11 to combine the respective phase windings 21 and the stator core 1 with each other.

In some embodiments, orthographic projections of the plurality of first connection portions 211 and the plurality of second connection portions 212 in the axial direction are alternately arranged in the circumferential direction.

The first end 201 includes a plurality of first connection portions 211 and the second end 202 includes a plurality of second connection portions 212. The first connection portion 211 and the second connection portion 212 are respectively formed as arc segments extending in the circumferential direction and having a certain circumferential angle, and the arc in which the first connection portion 211 is located, the arc in which the embedded portion 213 is located, and the arc in which the second connection portion 212 is located are arranged equidistantly.

In some alternative embodiments, the first connection portion 211 and the second connection portion 212 are disposed opposite to each other in the radial direction with respect to the wire groove 11 in an axial orthographic projection.

The first connection portions 211 and the second connection portions 212 of the phase winding 21 are alternately arranged along the circumferential direction along the orthographic projection of the axial direction, and are oppositely arranged about the winding groove 11 in the radial direction, that is, the first connection portions 211 and the second connection portions 212 are respectively turned over to two sides of the winding groove 11 in the radial direction, and this structure can also be regarded as that the circular arcs of the first connection portions 211, the circular arcs of the winding groove 11, and the circular arcs of the second connection portions 212 are equidistantly arranged in the radial direction. Therefore, the first connection portion 211 of the innermost phase winding 21 can be connected to the stator core 1, that is, to the first surface 101 of the stator core 1, and the second connection portions 212 of the plurality of phase windings 21 are all located inside the stator core 1 and do not contact with the stator core 1 and the second surface thereof.

In the embodiment of the present application, one end of the neutral end 214 and the outlet end 215 of the phase winding 21 are respectively connected to two adjacent second connection portions 212, and the other end extends toward the first face 101 along the radial direction. That is, the neutral end 214 and the outlet end 215 are located at both ends of the arc segment of the phase winding 21 and adjacent to each other. In the case where the neutral ends 214 and the outgoing ends 215 extend from the second connection portions 212 to the first connection portions 211, the neutral point connection rows 23, in which the neutral ends 214 of the plurality of phase windings 21 are connected to each other, may be provided on the first surface 101. Alternatively, one ends of the neutral end 214 and the outlet end 215 of the phase winding 21 may be connected to two adjacent first connection portions 211 and extend toward the second connection portion 212, and the neutral connection row 23 is disposed on the second surface.

In some alternative embodiments, the circumferential angles of the first connection portion 211 and the second connection portion 212 are equal to each other in the circumferential direction. The circumferential angles of the first and second connection portions 211 and 212 may be the first angle.

According to the nature of the phase winding 21, the radius of the circular arc where the second connection portion 212 is located is smaller than the radius of the circular arc where the first connection portion 211 is located in the radial direction, and the central angles of the circular arcs where the first connection portion 211 and the second connection portion 212 are equal to each other in the circumferential direction are the first angle.

Alternatively, the circumferential angles of the first and second connection portions 211 and 212 may be determined according to a specific design of the motor stator 100. For example, in the embodiment of the present application, the phase winding 21 includes N-1 first connection portions 211 and N second connection portions 212, where n=8, and the reason why the first connection portions 211 are less than the second connection portions 212 is that the neutral ends 214 and the outlet ends 215 of the phase winding 21 are led out from the second connection portions 212. Thus, in the circumferential direction, the circumferential angle of the first connection portion 211 and the second connection portion 212 is 360 °/(((N-1) +1) +n) =360 °/2N, and the circumferential angle of the first connection portion 211 and the second connection portion 212 is 22.5 °, that is, the first angle is equal to 22.5 °.

Referring again to fig. 2, in some embodiments of the present application, the plurality of phase windings 21 includes a first phase winding 21a, a second phase winding 21b, and a third phase winding 21c connected in series with each other, and the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c are arranged in a circumferentially offset manner, sequentially stacked in a radial direction, and disposed at intervals in an axial direction.

It is conceivable that since the stator winding 2 is a three-phase stacked winding in the embodiment of the present application, the stator winding 2 includes three phase windings 21 of the same shape, i.e., a first phase winding 21a, a second phase winding 21b, and a third phase winding 21c. Therefore, in the case where each phase winding 21 includes a plurality of repeating units 210, that is, the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c include a plurality of first repeating units, second repeating units, and third repeating units, respectively, one first connecting portion 211, one second connecting portion 212, and two embedding portions 213 are included in the first repeating units, the second repeating units, and the third repeating units. The plurality of repeating units 210 may be coupled to each other to match the stator core 1, and in the case where the neutral terminal 214 and the wire outlet terminal 215 are drawn out therefrom, the repeating units 210 include only a portion or include more or less of the first coupling portion 211, the second coupling portion 212, and the embedded portion 213, and at this time, the plurality of repeating units 210 are regarded as a group to be coupled to each other to match the stator core 1.

In order that the first, second and third phase windings 21a, 21b and 21c can be out of phase by a time angle of 120 °, the three phase windings 21 should be overlapped with each other and uniformly distributed in the circumferential direction, and thus, the first, second and third phase windings 21a, 21b and 21c are overlapped with each other such that the first connection portion 211 of the second phase winding 21b covers a part of the first connection portion 211 of the second phase winding 21b and the first connection portion 211 of the third phase winding 21c covers a part of the first connection portion 211 of the second phase winding 21 b. Also, since the three phase windings 21 should be insulated from each other, the three phase windings 21 are disposed at intervals in the axial direction, so that an insulating layer can be provided between the three phase windings 21.

In some alternative embodiments, the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c may be arranged at a second angle with a circumferential offset. For example, in the case where the circumferential angles of the first connection portion 211 and the second connection portion 212, that is, the first angle is equal to 22.5 °, in the embodiment of the present application, the first connection portion 211 of the second phase winding 21b covers 1/3 of the first connection portion 211 of the second phase winding 21b, the first connection portion 211 of the third phase winding 21c covers 1/3 of the first connection portion 211 of the second phase winding 21b, and the circumferential angles at which the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c are arranged in a staggered manner in the circumferential direction, that is, the second angle is equal to 15 °, and the second angle is equal to 2/3 of the first angle. Alternatively, the circumferential angles of the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c that are arranged in a staggered manner in the circumferential direction may be determined according to the specific design of the motor stator 100, and the relationship between the first angle and the second angle may be changed accordingly, which is not limited in the embodiment of the present application.

Referring again to fig. 2, each phase winding 21 is embedded in a corresponding winding slot 11, and needs to be kept relatively centered within the winding slot 11 and kept in relative position with the winding slot 11 during formation of the insulating layer and the cladding layer 3 so that the insulating layer can be uniformly filled between each phase winding 21 and the winding slot 11. At the same time, the relative positions of the phase windings 21 should be maintained so that the insulation layer can be uniformly filled between the phase windings 21. Accordingly, the embodiment of the present application provides the first insulating holder 12 and the second insulating holder 22 to hold the relative positions between the respective phase windings 21 and the winding slot 11, and the relative positions between the respective phase windings 21, respectively.

Fig. 5 is a schematic structural view of an example of the first insulating holder 12 according to some embodiments of the present application. As shown in fig. 5, in some embodiments of the present application, the stator core 1 includes a first insulating holder 12, the first insulating holder 12 is disposed at a first end 201 of the phase winding 21 and located between the phase winding 21 and the stator core 1, and a first connection portion 211 of the first phase winding 21a is connected to the first insulating holder 12.

The first insulating holder 12 is provided between the first connection portion 211 of the first phase winding 21a and the stator core 1, the first insulating holder 12 being fixed to the stator core 1, the first phase winding 21a being fixed to the first insulating holder 12 to hold the relative positions of the first phase winding 21a and the stator core 1. The first insulating holder 12 has a certain thickness in the axial direction, and the first phase winding 21a is connected to the first insulating holder 12 so as to be able to maintain a certain distance from the stator core 1. The first insulating holder 12 has a shape matching the first end 201 of the first phase winding 21a, and in the embodiment of the present application, the first insulating holder 12 may be formed in a ring shape, and in the radial direction, the ring-shaped inner diameter of the first insulating holder 12 is smaller than the diameter of the circular arc where the first connection portion 211 of the first phase winding 21a is located, and the ring-shaped outer diameter is smaller than the ring-shaped outer diameter of the stator core 1.

Alternatively, the first insulating holder 12 may be made of an insulating material of a polymer such as polyethylene or rubber. Alternatively, the first insulating holder 12 may be formed by pressing or cutting. Alternatively, the first insulating holder 12 may be fixed to the stator core 1 by bonding or caulking, and the first phase winding 21a may be fixed to the first insulating holder 12 by bonding, which is not limited in the embodiment of the present application.

In some embodiments of the present application, the surface of the first insulating holder 12 contacting the first phase winding 21a includes a first limiting portion 121, and the first limiting portion 121 cooperates with the first connecting portion 211 of the first phase winding 21a to limit the relative position of the stator winding 2 and the stator core 1 in the circumferential direction.

The first connection portions 211 of the first phase winding 21a are circumferentially spaced apart, and the first limiting portions 121 correspond to the first connection portions 211 to be engaged with the first connection portions 211. That is, the first limiting portions 121 are also circumferentially spaced apart from the first insulating holder 12. The first limiting portion 121 should be positioned close to the annular inner ring of the first insulating holder 12 so that a distance can be maintained from the winding groove 11 when the first phase winding 21a is connected to the first limiting portion 121.

When the first phase winding 21a is connected to the first insulating holder 12, the first connection portion 211 is aligned with the first stopper portion 121 and is fitted into the winding groove 11 in the axial direction, and the first connection portion 211 of the fitted first phase winding 21a is brought into contact with the first stopper portion 121, and at this time, the first phase winding 21a and the first stopper portion 121 can be fixed. In the embodiment of the present application, the width of the first limiting portion 121 in the radial direction is larger than the width of the other portions of the first insulating holder 12 to indicate the position of the first limiting portion 121.

Fig. 6 is a schematic structural view of another example of the first insulating holder 12 according to some embodiments of the present application. In some alternative embodiments, as shown in fig. 6, the first stopper 121 may be formed as a groove that mates with the first connection portion 211.

In the case where the first stopper 121 is formed as a groove, the first insulating holder 12 needs to have a greater thickness in the axial direction in order to form the groove thereon. Alternatively, the first limiting portion 121 may be formed by pressing, or may be formed by other means, which is not limited in the embodiment of the present application.

Alternatively, since the phase winding 21 includes the neutral end 214 and the outlet end 215, the first limiting portion 121 may not be provided at an appropriate position of the first insulating holder 12 to avoid the neutral end 214 and the outlet end 215 of the first phase winding 21 a.

Fig. 7 is a schematic structural view of an example of the second insulating holder 22 according to some embodiments of the present application. As shown in fig. 7, in some embodiments of the present application, the stator winding 2 further includes a second insulating holder 22, where a plurality of second insulating holders 22 are respectively disposed at the second ends 202 of the plurality of phase windings 21 and between the plurality of phase windings 21, and in embodiments of the present application, two second insulating holders 22 are respectively connected between the second connection portions 212 of the first phase winding 21a and the second phase winding 21b, and the second connection portions 212 of the second phase winding 21b and the third phase winding 21 c.

The second insulating holders 22 are disposed between the second connection portions 212 of the adjacent phase windings 21 to hold the relative positions of the phase windings 21. The second insulating holder 22 has a certain thickness in the axial direction, and the two phase windings 21 can be held at a distance from each other in the axial direction by the second insulating holder 22. The shape of the second insulating holder 22 is the same as the shape of the second end 202 of each phase winding 21, and in the embodiment of the present application, the second insulating holder 22 may be formed in a ring shape, and in the radial direction, the ring-shaped inner diameter of the second insulating holder 22 is smaller than the inner diameter of the circular arc where the second connection portion 212 of the phase winding 21 is located, and the ring-shaped outer diameter is smaller than the ring-shaped inner diameter of the stator core 1.

Alternatively, similar to the first insulating holder 12, the second insulating holder 22 may be made of an insulating material such as polyethylene or rubber. Alternatively, the second insulating holder 22 may be formed by pressing or cutting. Alternatively, the second insulating holders 22 may be adhesively fixed between the second connection portions 212 of the respective phase windings 21, to which the embodiment of the present application is not limited.

In some embodiments of the present application, the second insulating holder 22 includes a second limiting portion 221 and a third limiting portion (not shown) on both surfaces in the axial direction, the second limiting portion 221 is engaged with the second connection portion 212 of the first phase winding 21a or the second phase winding 21b, and the third limiting portion is engaged with the second connection portion 212 of the second phase winding 21b and the third phase winding 21c to limit the relative positions of the first phase winding 21a, the second phase winding 21b and the third phase winding 21c in the circumferential direction and the axial direction.

The second connection portions 212 of each phase winding 21 are circumferentially spaced apart, and the second and third limiting portions 221 and 221 respectively correspond to the second connection portions 212 of the adjacent phase windings 21 to respectively cooperate with the second connection portions 212 of the two phase windings 21. That is, the second limiting portions 221 and the third limiting portions are also circumferentially spaced apart from the second insulating holder 22. The second and third limiting portions 221 and 221 should be positioned close to the annular inner ring of the second insulating holder 22 so that a distance can be maintained between the second and third phase windings 21b and 21c and the winding slot 11 when they are connected to the second limiting portion 221.

After the first phase winding 21a is assembled to the stator core 1, the third stopper member of one second insulating holder 22 is aligned with the second connection portion 212 of the first phase winding 21a and assembled to the first phase winding 21a, and at this time, the first phase winding 21a and the second insulating holder 22 may be fixed. Then, the second connection portion 212 of the second phase winding 21b is aligned with the second stopper portion 221 of the second insulating holder 22, the second phase winding 21b is fitted into the winding groove 11 in the axial direction, and the second connection portion 212 of the fitted second phase winding 21b is brought into contact with the second stopper portion 221, and at this time, the second phase winding 21b and the second stopper portion 221 can be fixed. It should be understood that the second phase winding 21b, the other second insulating holder 22, and the third phase winding 21c may be assembled with each other similarly.

The second limiting portion 221 and the third limiting portion are arranged in a staggered manner in the circumferential direction, and are determined according to a second angle at which the windings 21 of each phase are arranged in a staggered manner in the circumferential direction. Alternatively, the second insulating holder 22 may not include the third limit portion, but include the second limit portion 221 only at the surface facing the second phase winding 21b and the third phase winding 21 c. In the embodiment of the present application, the width of the second stopper 221 in the radial direction is larger than the width of the other portions of the first insulating holder 12 to indicate the position of the second stopper 221.

Fig. 8 is a schematic structural view of another example of the second insulating holder 22 according to some embodiments of the present application. In some alternative embodiments, as shown in fig. 8, the second stopper 221 may be formed as a groove that mates with the second connection 212, and similarly, the third stopper may be formed as a groove.

In the case where the second stopper 221 is formed as a groove, the second insulating holder 22 needs to have a greater thickness in the axial direction in order to form a groove thereon. Alternatively, the second stopper 221 may be formed by pressing, or may be formed in other manners, which is not limited in the embodiment of the present application.

In some embodiments of the application, the insulating layer and the cladding layer 3 are integrally formed.

Since the first insulating holder 12 and the second insulating holder 22 are provided, the relative positions of the phase windings 21 and the stator core 1 can be maintained, and at the same time, the distance capable of filling the insulating layer is maintained between the phase windings 21 and the winding slot 11. Therefore, the stator core 1 and the stator winding 2 can be injection-molded to form an insulating layer between each phase winding 21 and the winding slot 11, and to cover the outer portions of the stator core 1 and the stator winding 2 with the cover layer 3. In some alternative embodiments, the insulating layer and the cladding layer 3 may be made of an insulating material such as a resin.

Based on the above description, a method of manufacturing the motor stator 100 of the embodiment of the present application will be specifically described below.

Fig. 9 is a flow chart illustrating a method for manufacturing a stator of an electric motor according to an embodiment of the application. As shown in fig. 9, the manufacturing method of the motor stator 100 includes the following steps.

S100, the stator core 1 and the stator winding 2 are assembled.

S200, an insulating layer is formed between each phase winding 21 and the slot wall of the winding slot 11, and a coating layer 3 is formed by coating the stator core 1 and the stator winding 2 to form a motor stator molding.

In step S100, each phase winding 21 of the stator winding 2 is fitted into the corresponding winding slot 11 of the stator core 1 in the axial direction, each phase winding 21 is spaced from the winding slot 11, and each phase winding 21 is also spaced from each other.

In step S200, the insulating layer may be coated or filled on the wall of the winding slot 11 before the phase winding 21 is embedded in the winding slot 11; each phase winding 21 may be coated when each phase winding 21 is assembled to the stator core 1 in the process of assembling each phase winding 21 to the stator core 1; or the stator core 1 and the stator winding 2 can be injection-molded together with the insulating layer after the stator core and the stator winding are completely assembled. The coating layer 3 can be formed by placing the assembled stator core 1 and stator winding 2 into a mold and injection-molding the inside of the mold. It should be understood that in step S200, the insulating layer and the cladding layer 3 may be formed simultaneously or separately, wherein the insulating layer may be formed during step S100, which is not limited in this embodiment of the present application.

Referring again to fig. 1, the motor stator 100 in fig. 1 includes a stator core 1, stator windings 2 and a coating layer 3, and each phase winding 21 of the stator windings 2 and each phase winding 21 and a slot wall of the winding slot 11 are disposed at intervals by an insulating layer, so that the motor stator molding is shown in fig. 1.

Fig. 10 is an exemplary flowchart illustrating some steps in the flowchart shown in fig. 9. As shown in fig. 10, in some alternative embodiments, step S100 includes the following steps.

S110, the first insulating holder 12 is provided on the end surface of the stator core 1 in the axial direction.

S120, the first phase winding 21a is assembled to the stator core 1, and the first phase winding 21a is provided to the first insulating holder 12.

S130, the second phase winding 21b and the third phase winding 21c are assembled to the stator core 1, and one second insulating holder 22 is provided between the first phase winding 21a and the second phase winding 21b, and one second insulating holder 22 is provided between the second phase winding 21b and the third phase winding 21 c.

Fig. 11 is a schematic structural diagram of the motor stator 100 in step S110 in the flowchart shown in fig. 10. As shown in fig. 11, in step S110, the first insulating holder 12 is fixed to the first surface 101 of the stator core 1. Alternatively, the first insulating holder 12 may be adhered to the stator core 1, or may be riveted to the stator core 1.

Fig. 12 is a schematic structural diagram of the motor stator 100 in step S120 in the flowchart shown in fig. 10. As shown in fig. 12, in step S120, the first connection portion 211 of the first phase winding 21a and the first stopper portion 121 of the first insulating holder 12 are aligned with each other, and the first phase winding 21a is fitted into the winding slot 11 of the stator core 1 in the axial direction. Alternatively, the first phase winding 21a may be bonded to the first insulating holder 12.

Fig. 13 is a schematic structural diagram of the motor stator 100 in step S130 in the flowchart shown in fig. 10. As shown in fig. 13, in step S130, the third limit portion of one second insulating holder 22 is matched with the second connection portion 212 of the first phase winding 21a, and the second insulating holder 22 is fixed to the first phase winding 21a; matching the second connection portion 212 of the second phase winding 21b with the second stopper 221 of the second insulation holder 22, the second phase winding 21b being axially assembled to the winding slot 11 of the stator core 1; matching the third limit portion of the other second insulating holder 22 with the second connection portion 212 of the second phase winding 21b, the second insulating holder 22 being fixed to the second phase winding 21b; the second connection portion 212 of the third phase winding 21c is matched with the second stopper 221 of the second insulating holder 22, and the third phase winding 21c is assembled in the axial direction to the winding slot 11 of the stator core 1.

Alternatively, step S200 may be partially performed after step S110, i.e., an insulating layer is coated or filled on the wall of the winding slot 11. Alternatively, step S200 may also be partially performed in step S130, that is, between the phase windings 21, each phase winding 21 is coated to form an insulating layer.

Fig. 14 is an exemplary flowchart illustrating some steps in the flowchart shown in fig. 10. As shown in fig. 14, in some alternative embodiments, step S130 includes the following steps.

S131, a second insulating holder 22 is fixed between the second end 202 of the first phase winding 21a and the second end 202 of the second phase winding 21 b.

S132, another second insulating holder 22 is fixed between the second end 202 of the second phase winding 21b and the second end 202 of the third phase winding 21 c.

Fig. 15 is a schematic structural diagram of the motor stator 100 in step S131 in the flowchart shown in fig. 14. As shown in fig. 15, in step S131, the second insulating holder 22 is provided at the second end 202 of the first phase winding 21a, the second phase winding 21b is fitted into the winding slot 11 of the stator core 1 in the axial direction, and the second end 202 of the second phase winding 21b is in contact with the second insulating holder 22. At this time, the first phase winding 21a and the second phase winding 21b are arranged at intervals in the axial direction by the second insulating holder 22, and a space is also formed between the first end 201 of the first phase winding 21a and the first end 201 of the second phase winding 21 b.

Fig. 16 is a schematic structural diagram of the motor stator 100 in step S132 in the flowchart shown in fig. 14. As shown in fig. 16, in step S132, the other second insulating holder 22 is provided at the second end 202 of the second phase winding 21b, the third phase winding 21c is fitted into the winding slot 11 of the stator core 1 in the axial direction, and the second end 202 of the third phase winding 21c is in contact with the second insulating holder 22. At this time, the second phase winding 21b and the third phase winding 21c are arranged at intervals in the axial direction by the second insulating holder 22, and the first end 201 of the second phase winding 21b and the first end 201 of the third phase winding 21c are also spaced apart from each other.

Referring again to fig. 14, at this time, the first phase winding 21a, the second phase winding 21b, and the third phase winding 21c are respectively disposed at intervals from the stator core by the first insulating holder 12, and are disposed at intervals from each other by the second insulating holder 22, that is, are formed as motor stator semifinished holders. To this end, after the stator core 1 and the stator winding 2 are assembled, the neutral ends 214 of the respective phase windings 21 may be connected to each other through the neutral point connection row 23.

Fig. 17 is an exemplary flowchart illustrating some steps in the flowchart shown in fig. 9. As shown in fig. 17, in some alternative embodiments, step S200 includes the following steps.

S210, forming an insulating layer and a coating layer 3 by injection molding at the gaps and the outer peripheral surface of each element in the motor stator semi-finished product holder, so that the insulating layer and the coating layer 3 are integrally formed, wherein the phase winding 21 is composed of bare copper wires.

In step S210, an insulating layer is injection-molded at the gaps of the respective elements of the motor stator semifinished holder, that is, the respective conductors of the motor stator 100, and an insulating layer and a coating layer 3 are injection-molded at the outer peripheral surface. Alternatively, the coating 3 may be formed integrally with the insulating layer, i.e. the motor stator semifinished holder is put into a mould and injection-moulded.

In some alternative embodiments, the first end 201 of each phase winding 21 of the stator winding 2 may be injection molded first, after the molding material is set, the second insulating holder 22 is removed, and the remaining part of the stator semifinished product holder of the motor is injection molded, that is, the space between the conductors can be ensured, and an insulating layer can be formed between the conductors, which is not limited by the embodiment of the application.

In summary, according to the motor stator 100 of the embodiment of the present application, by disposing the insulating layers between the phase windings 21 of the stator winding 2 and between the phase windings 21 and the wall of the winding slot 11 of the stator core 1, and coating the stator core 1 and the stator winding 2 with the coating layer 3, the insulating structure between the conductors of the motor stator 100 can be realized, and meanwhile, the process step of coating the insulating layer on the stator winding 2 in the prior art is replaced, so that the probability of scrapping the stator winding 2 due to the damaged insulating layer is reduced, further the production efficiency of the motor stator 100 is improved, and the manufacturing cost of the motor stator 100 is reduced.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Claims

1. A motor stator, comprising:

a stator core including a plurality of winding grooves arranged at intervals along a circumferential direction of the stator core;

the stator winding comprises a plurality of phase windings which are connected in series, each phase winding is inserted into the corresponding winding slot, each phase winding and each phase winding are arranged at intervals through an insulating layer, each phase winding comprises a first end and a second end, and the first end and the second end are respectively positioned at two sides of the stator core along the axial direction; and

A coating layer which is coated on the stator core and the stator winding,

an insulating holder provided at least one of the first end and the second end of the phase winding to hold a relative position between the phase windings and the stator core.

2. The motor stator according to claim 1, wherein,

the insulating holders include a first insulating holder and a second insulating holder,

the first insulating holder is provided at a first end of the phase winding and is located between the phase winding and the stator core;

the second insulating holder is disposed at the second ends of the plurality of phase windings and is located between the plurality of phase windings.

3. The motor stator according to claim 2, wherein each of the phase windings includes a plurality of repeating units distributed in the circumferential direction, the repeating units including a first connecting portion, a second connecting portion, and two embedded portions, the first connecting portion and the second connecting portion being located on both sides of the stator core, respectively, the embedded portions connecting the first connecting portion and the second connecting portion adjacent to themselves and being embedded in the winding grooves,

The orthographic projections of the plurality of first connecting parts and the plurality of second connecting parts in the axial direction are alternately arranged along the circumferential direction; the plurality of phase windings comprises a first phase winding, a second phase winding and a third phase winding which are arranged in a staggered way,

the first insulating holder is disposed between the first phase winding and the stator core to insulate the first phase winding from the stator core,

the second insulating holder includes a plurality of second connection portions between the first phase winding and the second phase winding, and a plurality of second connection portions between the second phase winding and the third phase winding, respectively.

4. The motor stator according to claim 3, wherein,

the surface of the first insulating holder, which is in contact with the first phase winding, comprises a plurality of first limiting parts, and the plurality of first limiting parts are matched with the plurality of first connecting parts so as to limit the relative positions of the stator winding and the stator core.

5. The motor stator according to claim 3, wherein,

the two surfaces of the second insulating holder along the axial direction respectively comprise a plurality of second limiting parts and a plurality of third limiting parts, the second limiting parts are matched with the first phase winding or the second connecting parts of the second phase winding, and the third limiting parts are matched with the second phase winding and the second connecting parts of the third phase winding so as to limit the relative positions of the first phase winding, the second phase winding and the third phase winding.

6. The motor stator according to claim 3, wherein the phase winding includes a neutral end and an outlet end,

the stator winding further includes a neutral point connection row having a plurality of connection holes to which the neutral ends of the plurality of phase windings are respectively connected and electrically connected to each other through the connection row;

the outlet end of the phase winding is exposed out of the coating layer.

7. The motor stator according to claim 1, wherein,

the phase winding is formed by bare copper wires;

the insulating layer and the cladding layer are integrally formed.

8. A method of manufacturing a stator for an electric machine, comprising:

assembling a stator core and stator windings, wherein the stator core comprises a plurality of winding grooves arranged at intervals along the circumferential direction of the stator core, the stator windings comprise a plurality of phase windings connected in series, each phase winding is inserted into the corresponding winding groove and is arranged at intervals with the groove wall of the winding groove, the plurality of phase windings are arranged at intervals, each phase winding comprises a first end and a second end, the first end and the second end are respectively positioned at two sides of the stator core along the axial direction, and an insulating holder is arranged at least one of the first end and the second end of the phase winding so as to maintain the relative position between the phase windings and the stator core;

An insulating layer is formed between each of the phase windings and a wall of the winding slot, and a coating layer is formed to cover the stator core and the stator windings to form a motor stator molding.

9. The method of manufacturing a stator of an electric machine according to claim 8, wherein the plurality of phase windings includes a first phase winding, a second phase winding, and a third phase winding, and the insulating holders include a first insulating holder and a second insulating holder;

the assembled stator core and stator winding includes:

arranging a first insulating holder on the axial end face of the stator iron core;

assembling the first phase winding to the stator core, the first phase winding being disposed on the first insulating holder;

and assembling the second phase winding and the third phase winding to the stator core, and arranging a second insulating holder between the first phase winding and the second phase winding, wherein the second phase winding and the third phase winding are provided with a second insulating holder so that the first phase winding, the second phase winding and the third phase winding are arranged at intervals.

10. The method of manufacturing a stator for an electric motor according to claim 9, wherein,

the assembling of the second phase winding and the third phase winding to the stator core includes:

securing one of said second insulating holders between said second end of said first phase winding and said second end of said second phase winding such that a space is formed between said first end of said first phase winding and said first end of said second phase winding;

fixing another one of the second insulating holders between the second end of the second phase winding and the second end of the third phase winding such that a space is formed between the first end of the second phase winding and the first end of the third phase winding;

to form a motor stator semifinished holder.

11. The method of manufacturing a motor stator according to claim 10, wherein the forming the motor stator molding includes:

the insulating layer and the coating layer are formed by injection molding at the gaps and the peripheral surfaces of all elements in the motor stator semi-finished product retainer, so that the insulating layer and the coating layer are integrally molded,

wherein the phase winding is composed of bare copper wire.

12. An electric machine, comprising:

a motor stator according to any one of claims 1-7.