CN211063503U - Motor stator structure, motor and vehicle - Google Patents
Motor stator structure, motor and vehicle Download PDFInfo
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- CN211063503U CN211063503U CN201922070590.6U CN201922070590U CN211063503U CN 211063503 U CN211063503 U CN 211063503U CN 201922070590 U CN201922070590 U CN 201922070590U CN 211063503 U CN211063503 U CN 211063503U
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Abstract
The utility model provides a motor stator structure, motor and vehicle, wherein, motor stator structure, include: the iron core comprises a first iron core part and a plurality of second iron core parts, the first iron core part is connected with the second iron core parts, the first iron core parts are cylindrical, the second iron core parts are arranged in a plurality of the second iron core parts, the second iron core parts are arranged on the inner wall of the first iron core part at intervals along the circumferential direction of the first iron core part, and mounting grooves are formed between the inner wall of the first iron core part and the side walls of two adjacent second iron core parts; the integrated winding is arranged in the mounting groove in a penetrating mode. The technical scheme of this application has effectively solved among the prior art assembly of flat wire stator winding and has had that welding strength is low, the insulation treatment degree of difficulty is high, production efficiency hangs down the scheduling problem.
Description
Technical Field
The utility model relates to a transportation field particularly, relates to a motor stator structure, motor and vehicle.
Background
In recent years, with the increase of technical breakthrough and market demand of new energy vehicles, flat wire motors have the advantages of higher power density, more excellent heat dissipation performance, smaller copper consumption for end portions, better NVH characteristics and the like compared with traditional round wire motors, and become the key field of research in international and domestic fields.
The new forms of energy flat wire motor of prior art inserts U type copper bar in every stator slot in fashioned stator core structure, then twists reverse the opening side copper bar of U type copper bar, carries out end to end welding shaping integral type winding coil after counterpointing, glues the insulating varnish stoving to the welding position again.
However, in the production process, the problems of low welding strength, high difficulty, high risk, low production efficiency and the like exist in the assembly process of the flat wire stator winding.
SUMMERY OF THE UTILITY MODEL
A primary object of the utility model is to provide a motor stator structure, motor and vehicle to there are low, the insulating processing degree of difficulty height, the low scheduling problem of production efficiency in the assembly of flat wire stator winding among the solution prior art.
In order to achieve the above object, according to an aspect of the present invention, there is provided a motor stator structure, including: the iron core comprises a first iron core part and a plurality of second iron core parts, the first iron core part is connected with the second iron core parts, the first iron core parts are cylindrical, the second iron core parts are arranged in a plurality of the second iron core parts, the second iron core parts are arranged on the inner wall of the first iron core part at intervals along the circumferential direction of the first iron core part, and mounting grooves are formed between the inner wall of the first iron core part and the side walls of two adjacent second iron core parts; the integrated winding is arranged in the mounting groove in a penetrating mode.
Further, first iron core portion and second iron core portion interference fit, the iron core still include with second iron core portion through interference fit's third iron core portion, second iron core portion is including relative first end and the second end that sets up, the first end of second iron core portion is through the inner wall connection of first connection structure with first iron core portion, the second end of second iron core portion is through the outer wall connection of second connection structure with third iron core portion.
Further, the first connection structure includes a first connection groove and a first connection protrusion, one of the first connection groove and the first connection protrusion is disposed on an inner wall of the first core portion, and the other is disposed on the first end of the second core portion, and the first connection groove penetrates the first end of the first core portion or the second core portion in an axial direction of the first core portion.
Further, the groove width of the first connecting groove gradually increases from the notch to the groove bottom.
Further, the second connecting structure includes a second connecting groove and a second connecting projection, one of the second connecting groove and the second connecting projection is disposed on an outer wall of the third iron core portion, the other one of the second connecting groove and the second connecting projection is disposed on the second end of the second iron core portion, and the second connecting groove penetrates through the second end of the third iron core portion or the second iron core portion in the axial direction of the third iron core portion.
Further, the groove width of the second connecting groove is gradually increased from the notch to the groove bottom.
Further, the third iron core part is sheet-shaped and comprises a plurality of third iron core parts, the plurality of third iron core parts are arranged at intervals along the circumferential direction of the first iron core part, and the plurality of third iron core parts correspond to the plurality of second iron core parts one to one.
Further, motor stator structure still includes the insulating part of setting in the mounting groove, and the integral type winding is including twisting back section and straightway, and the insulating part encloses to be established outside the straightway of integral type winding, and the axis direction of two tip edges of insulating part along the iron core respectively protrusion in two terminal surfaces of iron core.
Furthermore, the conducting wire of the integrated winding is a flat wire, the second iron core parts are plate-shaped, and the distance between every two adjacent second iron core parts is equal.
According to the utility model discloses an on the other hand provides a motor, including motor stator structure and electric motor rotor structure, motor stator structure is foretell motor stator structure.
According to another aspect of the present invention, there is provided a vehicle, including a motor, the motor being the above-mentioned motor.
Use the technical scheme of the utility model, motor stator structure includes: a core and an integral winding. The iron core includes a first iron core portion and a second iron core portion. The first core portion and the second core portion are connected. The first core portion is cylindrical. The second iron core parts are arranged on the inner wall of the first iron core part at intervals along the circumferential direction of the first iron core part, and mounting grooves are formed between the inner wall of the first iron core part and the side walls of two adjacent second iron core parts. The integral type winding is worn to establish in the mounting groove. In the present application, the first core portion and the second core portion are separate two structures, and the integrated winding is an integrated structure. Therefore, in the assembling process of the integrated winding and the iron core, the integrated winding can be fixed firstly, then the first iron core part or the second iron core part is matched with the integrated winding, the first iron core part and the second iron core part can be installed together, the integrated winding is fixed in the installation groove, and the assembly of the motor stator structure is realized. The assembly process avoids the operations of inserting, twisting, welding, paint dipping and the like of the U-shaped copper bar of the integrated winding around the iron core structure in the prior art, reduces the difficulty of the motor stator structure in the production process, and improves the production efficiency. Therefore, the technical scheme of the application effectively solves the problems that in the prior art, the assembly of the flat wire stator winding is low in welding strength, high in insulation processing difficulty, low in production efficiency and the like.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic perspective view of an embodiment of a stator structure of an electrical machine according to the invention;
fig. 2 shows an enlarged schematic view at a of the stator structure of the electrical machine of fig. 1;
fig. 3 shows a schematic perspective view of a core of the stator structure of the motor of fig. 1; and
fig. 4 shows an enlarged schematic view at B of the stator structure of the electrical machine of fig. 1.
Wherein the figures include the following reference numerals:
10. an iron core; 11. a first iron core portion; 12. a second iron core portion; 13. mounting grooves; 14. a third iron core; 20. an integral winding; 31. a first connecting groove; 32. a first connecting projection; 41. a second connecting groove; 42. a second connecting projection; 50. an insulating member.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 and 2, the stator structure of the motor of the present embodiment includes: a core 10 and an integral winding 20. The iron core 10 includes a first iron core portion 11 and a second iron core portion 12. The first core portion 11 and the second core portion 12 are connected. The first core portion 11 has a cylindrical shape, and the second core portion 12 has a plurality of shapes. A plurality of second core portions 12 are arranged at intervals on the inner wall of the first core portion 11 in the circumferential direction of the first core portion 11, and mounting grooves 13 are formed between the inner wall of the first core portion 11 and the side walls of two adjacent second core portions 12. The integrated winding 20 is arranged in the mounting groove 13 in a penetrating mode.
By applying the technical scheme of the embodiment, the motor stator structure comprises: a core 10 and an integral winding 20. The first core portion 11 and the second core portion 12 of the present embodiment are separate two structures, and the integrated winding 20 is an integrated structure. Therefore, in the process of assembling the integrated winding and the iron core, the integrated winding 20 can be fixed, and then the first iron core part 11 or the second iron core part 12 is matched with the integrated winding 20, so that the first iron core part 11 and the second iron core part 12 can be installed together, and the integrated winding 20 is fixed in the installation groove 13, thereby realizing the assembly of the motor stator structure. The assembly process avoids the operations of inserting, twisting, welding, paint dipping and the like of the U-shaped copper bar of the integrated winding around the iron core structure in the prior art, reduces the difficulty of the motor stator structure in the production process, and improves the production efficiency. Therefore, the technical scheme of the embodiment effectively solves the problems that the assembly of the flat wire stator winding in the prior art is low in welding strength, high in insulation processing difficulty, low in production efficiency and the like.
The integrated winding 20 is formed by integrally processing a plurality of conductive wires. That is, before the integrated winding 20 is assembled with the core 10, a plurality of wires are previously wound by twisting to form a final desired shape, forming the integrated winding 20. No further welding is necessary in this process. The motor stator structure of the embodiment is suitable for a flat wire stator winding.
As shown in fig. 1 and 2, in the present embodiment, the first core portion 11 is interference-fitted to the second core portion 12, and the iron core 10 further includes a third core portion 14 that is interference-fitted to the second core portion 12. The third iron core part 14 can optimize a magnetic field and reduce the harmonic content of the magnetic field, and can avoid self-closing of the magnetic field and reduce the magnetic leakage coefficient. The second core portion 12 includes a first end and a second end disposed opposite to each other, the first end of the second core portion 12 is connected to the inner wall of the first core portion 11 by a first connecting structure, and the second end of the second core portion 12 is connected to the outer wall of the third core portion 14 by a second connecting structure. In this way, the second core portion 12 is facilitated to be connected with the first core portion 11 by the first connecting structure. The second core portion 12 and the third core portion 14 are connected together by a second connecting structure. Note that the outer wall of the third iron core portion 14 is the side of the third iron core portion 14 away from the axial direction of the first iron core portion 11, and the inner wall of the third iron core portion 14 is the side of the third iron core portion 14 facing the axial direction of the first iron core portion 11.
The first core portion 11 of the present embodiment is a rated stator core, the second core portion 12 is a tooth stator core, and the third core portion 14 is a slot stator core.
As shown in fig. 3 and 4, in the present embodiment, the first connection structure includes a first connection groove 31 and a first connection protrusion 32. The first coupling groove 31 is provided on the inner wall of the first core portion 11, and the first coupling protrusion 32 is provided on the first end of the second core portion 12. The first connecting groove 31 penetrates the first core portion 11 in the axial direction of the first core portion 11. In the process of mounting the motor stator structure, the second core portion 12 may be fixed by an external jig, and the first core portion 11 is inserted on the first coupling projection 32 of the second core portion 12 from the first coupling groove 31 in the axial direction of the first core portion 11, achieving the interference fit of the first core portion 11 and the second core portion 12.
In other embodiments not shown in the drawings, the first coupling groove is provided on the first end of the second core portion, and the first coupling protrusion is provided on the inner wall of the first core portion. The first connecting groove penetrates the first end of the second core portion in the axial direction of the first core portion.
As shown in fig. 4, in the present embodiment, the groove width of the first connecting groove 31 gradually increases from the notch to the groove bottom. In this way, in the radial direction of the first core portion 11, the first coupling projection 32 can be prevented from coming out, so that the first coupling groove 31 is fitted more closely with the first coupling projection 32, and the interference effect of the second core portion 12 and the first core portion 11 is further improved. Note that the width of the notch of the first connecting groove 31 is a distance of the notch of the first connecting groove 31 in the circumferential direction of the first core portion 11.
As shown in fig. 3 and 4, in the present embodiment, the second coupling structure includes a second coupling groove 41 and a second coupling projection 42, and the second coupling groove 41 is provided on the outer wall of the third core portion 14. The second coupling projection 42 is provided on the second end of the second core portion 12. The second connecting groove 41 extends through the third core portion 14 in the axial direction of the third core portion 14. During the installation of the stator structure of the motor, the second iron core part 12 may be fixed by an external jig, and the third iron core part 14 is inserted onto the second connecting protrusion 42 of the second iron core part 12 from the second connecting groove 41 along the axial direction of the first iron core part 11, so that the interference fit between the third iron core part 14 and the second iron core part 12 is achieved.
As shown in fig. 4, in the present embodiment, the groove width of the second connecting groove 41 is gradually increased from the notch to the groove bottom. In this way, in the radial direction of the first core portion 11, the second connecting projection 42 can be prevented from coming out, so that the second connecting groove 41 is more tightly fitted with the second connecting projection 42, and the interference effect between the second core portion 12 and the third core portion 14 is better. Note that the width of the notch of the second coupling groove 41 is a distance of the notch of the second coupling groove 41 in the circumferential direction of the first core portion 11.
In other embodiments not shown in the figures, the second coupling groove is provided on the second end of the second core part and the second coupling projection is provided on the outer wall of the third core part. The second connecting groove penetrates through the second end of the second iron core part along the axial direction of the third iron core part.
As shown in fig. 3 and 4, in the present embodiment, the third core portion 14 has a sheet-like shape. The third iron core portion 14 includes a plurality of third iron core portions 14 arranged at intervals in the circumferential direction of the first iron core portion 11. The plurality of third iron core portions 14 correspond one-to-one to the plurality of second iron core portions 12. The plurality of third iron core parts 14 can reduce the magnetic leakage coefficient greatly, and prevent magnetic leakage better. At the same time, the magnetic field generated by the integrated winding 20 can be used as more conversion energy. Of course, there may be one third core portion, which facilitates assembly.
As shown in fig. 1 and 2, in the present embodiment, the stator structure of the motor further includes an insulating member 50 disposed in the mounting groove 13. The integrated winding 20 comprises a torsion section and a straight section, and the insulating part 50 is arranged outside the straight section of the integrated winding 20 in a surrounding mode. The insulating member 50 can isolate the straight line segment of the integrated winding 20 from the iron core 10, so that the integrated winding 20 is not electrified with the iron core 10 after being electrified. Both end portions of the insulator 50 protrude from both end surfaces of the core 10 in the axial direction of the core 10, respectively. In this way, the insulating member 50 can wrap all the straight line segments of the integrated winding 20, and the working reliability of the motor stator structure can be improved. The insulating member 50 of the present embodiment is preferably insulating paper.
As shown in fig. 1 and 2, in the present embodiment, the wire of the integrated winding 20 is a flat wire, the second core portions 12 are plate-shaped, and the distance between two adjacent second core portions 12 is equal. In this way, the space of the mounting grooves 13 is made equal, facilitating the rational arrangement of the integrated windings 20. The integral winding 20 is a copper bar winding.
In this embodiment, the motor stator structure with the integrated winding 20 is adopted, so that welding is not required, and the technological processes of copper wire twisting, welding and paint dipping in the prior art can be omitted. The specific structural assembly process of this embodiment is as follows:
1) the insulation member 50 wraps the straight line segment of the integrated winding 20;
2) installing the insulating part 50 and the integrated winding 20 on a vertical fixed support;
3) each second core portion 12 is inserted from the periphery of the integrated winding 20 to between the straight line segments of the adjacent wires of the integrated winding 20, and each second core portion 12 is fixed from the outside by an external jig;
4) then clamping the third iron core part 14 through an internal clamp, inserting the third iron core part 14 into a central hole surrounded by the integrated winding 20 along the axis of the third iron core part, and performing hot-fit mounting of a second connecting groove 41 and a second connecting bulge 42;
5) the outer clamps withdraw the second iron core portion 12, and the second iron core portion 12 and the third iron core portion 14 are fixed by the inner clamps,
the first core portion 11 is fitted in its axial direction, and the first coupling groove 31 is fitted with the first coupling projection 32 by hot fitting;
6) finally, the iron core 10 is cooled, and the assembly of the motor stator structure is completed.
Foretell vertical fixed bolster can be the columnar body, and the columnar body includes the column body and sets up the first annular groove on the column body, and the columnar body is still including setting up the second annular groove on the column body, and the radial dimension of second annular groove is less than the radial dimension of first annular groove, and the second annular groove is located first arc recess, and the lower part card of integral type winding 20 is gone into to first annular groove in, and first annular groove can support, and fix integral type winding 20. The external jig may be a robot jig and the internal jig may comprise a robot jig and a cylindrical holder removably inserted into the second annular groove for securing the second core portion 12 and the third core portion 14. Of course, in other embodiments not shown, both the fixation of the second core portion and the fixation of the third core portion may be performed manually and by auxiliary tools, which may include hammers and gloves.
The integral winding of the present embodiment is distributed or centralized. The integrated winding can be formed in a vertical mode or a horizontal mode.
The application also provides a motor, and the motor of this embodiment includes motor stator structure and electric motor rotor structure, motor stator structure is foretell motor stator structure. The motor of this embodiment can solve among the prior art assembly of flat wire stator winding and have that welding strength is low, the insulation treatment degree of difficulty is high, production efficiency hangs down the scheduling problem.
The application also provides a vehicle, and the vehicle of this embodiment includes the motor, the motor is foretell motor. The vehicle of this embodiment can solve among the prior art flat wire stator winding's assembly and have that welding strength is low, the insulation treatment degree of difficulty is high, production efficiency hangs down the scheduling problem.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. An electric machine stator structure, comprising:
the iron core (10) comprises a first iron core part (11) and a second iron core part (12), wherein the first iron core part (11) is connected with the second iron core part (12), the first iron core part (11) is cylindrical, the second iron core part (12) is multiple, the second iron core parts (12) are arranged on the inner wall of the first iron core part (11) at intervals along the circumferential direction of the first iron core part (11), and mounting grooves (13) are formed between the inner wall of the first iron core part (11) and the side walls of two adjacent second iron core parts (12);
and the integrated winding (20) is arranged in the mounting groove (13) in a penetrating manner.
2. The electric machine stator structure according to claim 1, wherein the first core portion (11) is in interference fit with the second core portion (12), the core (10) further comprises a third core portion (14) in interference fit with the second core portion (12), the second core portion (12) comprises a first end and a second end which are oppositely arranged, the first end of the second core portion (12) is connected with an inner wall of the first core portion (11) through a first connecting structure, and the second end of the second core portion (12) is connected with an outer wall of the third core portion (14) through a second connecting structure.
3. The motor stator structure according to claim 2, characterized in that the first connection structure includes a first connection groove (31) and a first connection protrusion (32), one of the first connection groove (31) and the first connection protrusion (32) is provided on an inner wall of the first core portion (11), and the other is provided on a first end of the second core portion (12), and the first connection groove (31) penetrates a first end of the first core portion (11) or the second core portion (12) in an axial direction of the first core portion (11).
4. The stator structure of an electric machine according to claim 3, characterized in that the slot width of the first connecting slot (31) becomes gradually larger from the slot opening to the slot bottom.
5. The electric machine stator structure according to claim 2, characterized in that the second connection structure comprises a second connection groove (41) and a second connection protrusion (42), one of the second connection groove (41) and the second connection protrusion (42) being provided on an outer wall of the third core part (14) and the other being provided on a second end of the second core part (12), the second connection groove (41) penetrating the third core part (14) or the second end of the second core part (12) in an axial direction of the third core part (14).
6. The stator structure of an electric machine according to claim 5, characterized in that the slot width of the second connection slot (41) is gradually larger from slot to slot bottom.
7. The stator structure of the motor according to claim 2, wherein the third iron core portion (14) is sheet-shaped, the third iron core portion (14) comprises a plurality of the third iron core portions (14) arranged at intervals along the circumferential direction of the first iron core portion (11), and the plurality of the third iron core portions (14) correspond to the plurality of the second iron core portions (12) one by one.
8. The motor stator structure according to claim 1, further comprising an insulator (50) disposed in the mounting groove (13), wherein the integrated winding (20) comprises a twisted section and a straight section, the insulator (50) is enclosed outside the straight section of the integrated winding (20), and two ends of the insulator (50) respectively protrude from two end faces of the core (10) along an axial direction of the core (10).
9. The stator structure of an electric machine according to claim 1, characterized in that the wire of the integrated winding (20) is a flat wire, the second core portions (12) are shaped like plates, and the intervals between adjacent two of the second core portions (12) are equal.
10. An electrical machine comprising a machine stator structure and a machine rotor structure, characterized in that the machine stator structure is a machine stator structure according to any of claims 1-9.
11. A vehicle comprising an electric machine, characterized in that the electric machine is an electric machine according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922070590.6U CN211063503U (en) | 2019-11-25 | 2019-11-25 | Motor stator structure, motor and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922070590.6U CN211063503U (en) | 2019-11-25 | 2019-11-25 | Motor stator structure, motor and vehicle |
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| CN211063503U true CN211063503U (en) | 2020-07-21 |
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| CN201922070590.6U Active CN211063503U (en) | 2019-11-25 | 2019-11-25 | Motor stator structure, motor and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737249A (en) * | 2020-12-25 | 2021-04-30 | 厦门势拓御能科技有限公司 | Stator manufacturing method adopting continuous wave winding process, stator and flat wire motor |
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2019
- 2019-11-25 CN CN201922070590.6U patent/CN211063503U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737249A (en) * | 2020-12-25 | 2021-04-30 | 厦门势拓御能科技有限公司 | Stator manufacturing method adopting continuous wave winding process, stator and flat wire motor |
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