WO2021143162A1

WO2021143162A1 - Disc-type electric motor and stator

Info

Publication number: WO2021143162A1
Application number: PCT/CN2020/114461
Authority: WO
Inventors: 汤磊; 夏莉
Original assignee: 上海盘毂动力科技股份有限公司
Priority date: 2020-01-15
Filing date: 2020-09-10
Publication date: 2021-07-22

Abstract

Disclosed are a disc-type electric motor and a stator. The stator comprises a PCB winding assembly (1), wherein the PCB winding assembly (1) comprises an insulating plate (11) and a PCB winding (12) printed on the insulating plate (11), the PCB winding (12) comprises a plurality of coils (121), and the coils (121) are printed on the insulating plate (11). According to the solution, the PCB winding is arranged on the insulating plate to form the stator of an electric motor, and matching between an iron core and a coil of a conventional electric motor is replaced, such that a complex iron core manufacturing procedure and a winding discharging procedure are omitted, the machining procedure of the stator is greatly simplified, the production efficiency of the stator is thus improved to a certain extent, and an iron core is omitted, and the production cost of the stator is reduced.

Description

Disc type motor and stator

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on January 15, 2020, the application number is 202010043190.0, and the invention title is "a disc motor and stator", and it is filed in China on January 15, 2020 The patent office, the application number is 202020097711.6, and the title of the invention is "a disc motor and stator" is the priority of the Chinese patent application, the entire content of which is incorporated into this application by reference.

Technical field

The present invention relates to the technical field of motors, in particular to a disc motor and a stator.

Background technique

The stator of a conventional motor includes an iron core and windings. The manufacturing process of the iron core and the winding process are relatively complicated, resulting in low production efficiency of the stator.

Therefore, how to simplify the processing procedures of the stator to improve the production efficiency of the stator has become a technical problem to be solved urgently by those skilled in the art.

Summary of the invention

In view of this, the present invention provides a stator to simplify the machining process of the stator and improve the production efficiency of the stator. The invention also provides a disc motor.

In order to achieve the above objectives, the present invention provides the following technical solutions:

A stator, suitable for a disc motor, comprising at least one PCB winding assembly, the PCB winding assembly being stacked and arranged, the PCB winding assembly including an insulating plate and a plurality of PCB windings printed on the insulating plate, the PCB winding The number of is equal to the number of phases of the disc motor, a plurality of the PCB windings are arranged in a stack and the adjacent PCB windings are sequentially connected, and the PCB windings are provided with input conductors and tail conductors,

The PCB winding includes a plurality of coils, the number of the coils is equal to the number of stages of the disc motor, and the coils include N first conductors arranged side by side on the insulating plate and on the insulating plate. N second conductors arranged side by side in the lower layer, the first conductor and the second conductor are arranged radially, the outer end of the first conductor is connected to the outer end of the second outer end conductor, the The inner end of the first conductor is connected to the inner end of the second conductor, and one of the first conductors of one of the coils of the two adjacent coils is in the same position as the other of the coils. Conductor connection, one of the second conductors of one of the coils of two adjacent coils is connected to a second conductor of the same position of the other coil, where N is the number of turns, and N is a positive integer.

Preferably, in the above-mentioned stator, both the first conductor and the second conductor include an inner end conductor, a working conductor, and an outer end conductor that are sequentially arranged from the middle to the end of the PCB winding,

The inner end conductor of the first conductor is connected to the inner end conductor of the second conductor corresponding to the position,

The outer end conductor of the first conductor is connected to the outer end conductor of the corresponding second conductor.

Preferably, in the aforementioned stator, two adjacent coils are connected by an auxiliary conductor assembly, and the auxiliary conductor assembly includes:

The first auxiliary conductor is located on the lower layer of the resin board, and the first end of the first auxiliary conductor is connected to one of the second conductors of the first coil of the two adjacent coils;

The second auxiliary conductor is located on the upper layer of the resin board and is arranged side by side with the first conductor. The first end of the second auxiliary conductor is connected to the second end of the first auxiliary conductor. The second end is connected to one of the second conductors of the second coil connected to the adjacent coil, and the position of the second conductor connected to the second auxiliary conductor of the second coil is connected to the The position of the second conductor connected to the first coil and the first auxiliary conductor is the same;

A third auxiliary conductor located on the lower layer of the resin board, and a first end of the third auxiliary conductor is connected to one of the first conductors of the second coil;

The fourth auxiliary conductor is located on the upper layer of the resin board, the first end of the fourth auxiliary conductor is connected to the second end of the third auxiliary conductor, and the second end of the fourth auxiliary conductor is connected to the same One of the first conductors of the third coil adjacent to the second coil is connected, and the position of the first conductor connected to the fourth auxiliary conductor of the third coil is connected to the second coil and the third auxiliary conductor. The positions of the first conductors to which the conductors are connected are the same.

Preferably, in the above-mentioned stator, the input conductors are provided on the N first conductors arranged side by side and/or the N second conductors arranged side by side.

Preferably, in the above-mentioned stator, the tail conductor is provided on the N first conductors arranged side by side and/or the N second conductors arranged side by side.

Preferably, in the above-mentioned stator, the tail conductors of adjacent PCB windings are connected in sequence.

Preferably, in the aforementioned stator, the tail conductor of the PCB winding on the upper layer is connected to the input conductor of the PCB winding on the lower layer.

Preferably, in the above-mentioned stator, the working conductor is provided with a hollow slot.

Preferably, in the above stator, the first conductor and the second conductor are copper conductors.

A disc motor includes a stator, and the stator is the stator described in any one of the above solutions.

It can be seen from the above technical solutions that the stator provided by the present invention includes a PCB winding assembly. The PCB winding assembly includes an insulating plate and a PCB winding printed on the insulating plate. The PCB winding includes a plurality of coils, and the coils are printed on the insulating plate. In this solution, the PCB winding is arranged on the insulating plate to form the stator of the motor, instead of the iron core and the coil of the conventional motor, eliminating the more complicated iron core manufacturing process and winding offline process, which greatly simplifies the stator processing process. Thereby, the production efficiency of the stator is improved to a certain extent, while the iron core is omitted, and the production cost of the stator is reduced.

The solution also discloses a disc motor, which includes a stator, and the stator is the stator described in any one of the above solutions. Since the stator has the above technical effect, the disc motor with the stator also has the same technical effect, which will not be repeated here.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a stator provided by an embodiment of the present invention;

2 is a schematic diagram of the structure of an A-phase winding assembly provided by an embodiment of the present invention;

3 is a schematic diagram of the structure of an upper winding provided by an embodiment of the present invention;

4 is a schematic diagram of the structure of a lower winding provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a B-phase winding assembly provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a phase C winding assembly provided by an embodiment of the present invention.

in,

1. PCB winding assembly, 11, insulating board, 12, PCB winding, 121, coil, 1211, first conductor, 1212, second conductor, 12111, inner end conductor, 12112, working conductor, 12113, outer end conductor , 1213, auxiliary conductor assembly, 12131, first auxiliary conductor, 12132, second auxiliary conductor, 12133, third auxiliary conductor, 12134, fourth auxiliary conductor, 122, tail conductor, 123, input conductor.

Detailed ways

The invention discloses a stator to simplify the processing procedures of the stator and improve the production efficiency of the stator. The invention also discloses a disc motor.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Referring to Figures 1-6, the present invention discloses a stator suitable for disc motors.

The stator includes at least one PCB winding assembly 1. Specifically, the number of PCB winding components 1 can be one, two, three, or even more, and the number of PCB winding components 1 can be selected according to actual needs. When the number of PCB winding assemblies 1 is at least two, a plurality of PCB winding assemblies 1 are coaxially stacked and arranged. The connection means between adjacent PCB winding assemblies 1 is a very mature connection means in the prior art. Those skilled in the art can choose a means to connect adjacent PCB winding assemblies 1 according to actual needs, which is not specifically limited here. .

The PCB winding assembly 1 includes an insulating board 11 and a plurality of PCB windings 12 printed on the insulating board 11. The number of PCB windings 12 is equal to the number of phases of the disc motor.

When the disk motor is a three-phase motor, the number of PCB windings 12 is three; when the disk motor is a four-phase motor, the number of PCB windings 12 is four; the disk motor can also be a five-phase motor or a six-phase motor For the motor, the number of PCB windings 12 is five or six, and so on.

The PCB winding 12 is provided with an input conductor 123 and a tail conductor 122, where the input conductor 123 is used to guide external current into the PCB winding 12, and the input conductor 123 and/or the tail conductor 122 are used to connect adjacent PCB windings 12.

Specifically, the input conductor 123 and the tail conductor 122 are also printed on the insulating board 11.

A plurality of PCB windings 12 are coaxially stacked and arranged, as shown in FIGS. 1, 2, 5, and 6.

The PCB winding 12 includes an upper and lower two-layer structure, and the upper and lower layers are insulated by an insulating plate 11.

Specifically, the upper and lower layers of the PCB winding 12 may be respectively located on the upper and lower end surfaces of the same insulating board 11, or may be located on the upper end surface of one insulating board 11 and the lower end surface of the other insulating board 11 of different insulating boards 11.

Preferably, the insulating board 11 of this solution is a resin board.

The specific upper and lower two-layer structure includes a structure composed of a first conductor 1211 located on the upper layer of the insulating board 11 and a structure composed of a second conductor 1212 located on the lower layer of the insulating board 11. As shown in Figs. 3 and 4, Fig. 3 is the upper structure and Fig. 4 is the lower structure. The first conductor 1211 on the upper layer of the insulating plate 11 and the corresponding second conductor 1212 on the lower layer of the insulating plate 11 form a coil 121.

Each PCB winding 12 includes a plurality of coils 121, the number of coils 121 is equal to the number of stages of the disc motor, and the span between adjacent first conductors 1211 and second conductors 1212 is one pole pitch. The direction of current between two adjacent coils 121 is opposite. For example, the direction of current in one of the coils 121 is clockwise, and the direction of current in adjacent coils 121 is counterclockwise.

As shown in FIGS. 1, 2, 5 and 6, the coil 121 includes N first conductors 1211 arranged side by side on the upper layer of the insulating plate 11 and N second conductors 1212 arranged side by side on the lower layer of the insulating plate 11.

The first conductor 1211 and the second conductor 1212 are respectively located on the upper and lower layers of the insulating board 11 and are arranged in mirror symmetry. In order to realize the current transmission between the first conductor 1211 and the second conductor 1212, the upper end of the first conductor 1211 is connected to the upper end of the second conductor 1212, and the lower end of the first conductor 1211 is connected to the lower end of the second conductor 1212.

As shown in FIGS. 1-6, the upper end of the first conductor 1211 and the upper end of the second conductor 1212 are connected through a first connection via, and the lower end of the first conductor 1211 and the lower end of the second conductor 1212 are connected through a second connection via.

As shown in Figures 1-6, the coil 121 formed by the first conductor 1211 and the second conductor 1212 has a sector-shaped or hexagonal structure, and the active parts of the first conductor 1211 and the second conductor 1212 are the first conductor 1211 and the second conductor 1212 The portion along the radial direction of the PCB winding 12.

Two adjacent coils 121 are connected in sequence. Specifically, one of the first conductors 1211 of one of the coils 121 of the two adjacent coils 121 is connected to the first conductor 1211 of the other coil 121 in the same position, and one of the coils 121 of the two adjacent coils 121 The second conductor 1212 is connected to the second conductor 1212 in the same position of the other coil 121, so that the currents of the two adjacent coils 121 are reversed.

In this scheme, N represents the number of turns, and N is a positive integer.

It should be noted here that the N first conductors 1211 of each coil 121 are parallel to each other and do not overlap each other, and the N second conductors 1212 of each coil 121 are parallel to each other and do not overlap each other, and the adjacent PCB windings 12 The first conductors 1211 do not overlap, and the second conductors 1212 of adjacent PCB windings 12 do not overlap either.

In this solution, the stator includes at least one PCB winding assembly 1, the PCB winding assembly 1 includes an insulating board 11 and a PCB winding 12 printed on the insulating board 11, the PCB winding 12 includes a plurality of coils 121, and the coils 121 are printed on the insulating board 11. In this solution, the PCB winding 12 is arranged on the insulating plate 11 to form the stator of the motor, instead of the iron core of the conventional motor to cooperate with the coil 121, which eliminates the more complicated iron core manufacturing process and winding off-line process, and greatly simplifies the stator The machining process improves the production efficiency of the stator to a certain extent, while eliminating the iron core and reducing the production cost of the stator.

The first conductor 1211 and the second conductor 1212 have the same structure. In a specific embodiment of this solution, the first conductor 1211 and the second conductor 1212 each include an inner end conductor 12111, a working conductor 12112, and an outer end conductor 12113, and extend from the middle of the PCB winding 12 to the end.

Specifically, the numbers of inner end conductors 12111, working conductors 12112, and outer end conductors 12113 are all N.

As shown in Figures 1-6, the outer end conductor 12113 of the first conductor 1211 and the outer end conductor 12113 of the second conductor 1212 are connected through a first connection via, and the inner end conductor 12111 of the first conductor 1211 is connected to the second conductor 1211. The inner end conductor 12111 of the conductor 1212 is connected through a second connection via.

As shown in Figures 1-6, the inner end conductor 12111 and the outer end are arranged obliquely with respect to the working conductor 12112 and are located on one side of the working conductor 12112. The inner end conductor 12111 and the outer end conductor 12113 of the first conductor 1211 are The installation direction is opposite to the installation direction of the inner end conductor 12111 and the outer end conductor 12113 of the second conductor 1212, and the oblique direction is opposite.

The working conductor 12112 is arranged along the radial direction of the PCB winding 12, only the working conductor 12112 functions as the coil 121, and the inner end conductor 12111 and the outer end conductor 12113 function to connect the upper and lower working conductors 12112.

Preferably, the first conductor 1211 and the second conductor 1212 are both integrally formed conductors.

Two adjacent coils 121 are connected by an auxiliary conductor assembly 1213. In this solution, one of the two adjacent coils 121 is named the first coil 121, the coil 121 adjacent to the first coil 121 is the second coil 121, and the coil 121 adjacent to the second coil 121 is the first coil 121. Three coils 121, the third coil 121 and the first coil 121 have the same structure, but for the convenience of description, the coil 121 is named the third coil 121. The first coil 121 and the second coil 121 are spaced apart on the circumference of the PCB winding 12.

In a specific embodiment of this solution, the auxiliary conductor assembly 1213 includes a first auxiliary conductor 12131, a second auxiliary conductor 12132, a third auxiliary conductor 12133, and a fourth auxiliary conductor 12134.

As shown in Figures 2, 5 and 6.

The first auxiliary conductor 12131 is located on the lower layer of the resin board, and the first end of the first auxiliary conductor 12131 is connected to one of the second conductors 1212 of the first coil 121 of the two adjacent coils 121;

The second auxiliary conductor 12132 is located on the upper layer of the resin board and is arranged side by side with the first conductor 1211, the first end of the second auxiliary conductor 12132 is connected to the second end of the first auxiliary conductor 12131, and the second end of the second auxiliary conductor 12132 is connected to the One of the second conductors 1212 of the second coil 121 connected to the adjacent coils 121 is connected, and the position of the second conductor 1212 where the second coil 121 is connected to the second auxiliary conductor 12132 is the same as the first coil 121 and the first auxiliary conductor 12131 The positions of the connected second conductors 1212 are the same;

The third auxiliary conductor 12133 is located on the lower layer of the resin board, and the first end of the third auxiliary conductor 12133 is connected to one of the first conductors 1211 of the second coil 121;

The fourth auxiliary conductor 12134 is located on the upper layer of the resin board, the first end of the fourth auxiliary conductor 12134 is connected to the second end of the third auxiliary conductor 12133, and the second end of the fourth auxiliary conductor 12134 is adjacent to the second coil 121 One of the first conductors 1211 of the third coil 121 is connected, the position of the first conductor 1211 connected to the fourth auxiliary conductor 12134 of the third coil 121, and the first conductor 1211 connected to the second coil 121 and the third auxiliary conductor 12133 The location is the same.

In order to reduce the amount of material used, the second conductor 1212 connected to the first auxiliary conductor 12131 and the outer end conductor 12113 of the first conductor 1211 connected to the fourth auxiliary conductor 12134 are omitted in this solution, and the first auxiliary conductor 12131 is used. Instead of the outer end conductor 12113 of the second conductor 1212, the outer end conductor 12113 of the first conductor 1211 is replaced by a fourth auxiliary conductor 12134. As shown in FIGS. 2-6, the lengths of the first auxiliary conductor 12131 and the fourth auxiliary conductor 12134 are shorter than the length of the outer end conductor 12113.

The second auxiliary conductor 12132 is arranged side by side with the outer end conductor 12113 of the second conductor 1212, and the third auxiliary conductor 12133 is arranged side by side with the outer end conductor 12113 of the first conductor 1211, as shown in Figure 2-6, the second auxiliary conductor The lengths of 12132 and the third auxiliary conductor 12133 are equal to the length of the outer end conductor 12113.

The first auxiliary conductor 12131 and the second auxiliary conductor 12132 are connected through a third connection via, and the third auxiliary conductor 12133 and the fourth auxiliary conductor 12134 are connected through a fourth connection via.

The auxiliary conductor assembly 1213 not only realizes the connection of the adjacent coils 121, but also realizes the commutation of the current in the adjacent coils 121.

In this solution, the input conductor 123 is provided on the N first conductors 1211 arranged side by side and/or the N second conductors 1212 arranged side by side. Specifically, the input conductor 123 may only be connected to the N first conductors 1211 arranged side by side. , It may be connected to only N second conductors 1212 arranged side by side, or it may be connected to N first conductors 1211 arranged side by side and N second conductors 1212 arranged side by side connected to each other at the same time.

In this solution, the tail conductor 122 is provided on the N first conductors 1211 arranged side by side and/or the N second conductors 1212 arranged side by side. Specifically, the tail conductor 122 may only be arranged side by side with the N first conductors. The 1211 connection may be connected to only N second conductors 1212 arranged side by side, or it may be connected to N first conductors 1211 arranged side by side and N second conductors 1212 arranged side by side after being connected to each other at the same time.

It should be noted here that the input conductor 123 and the tail conductor 122 do not overlap, and need to be arranged on different first conductors 1211 and/or second conductors 1212.

As shown in FIGS. 1-6, the input conductor 123 and the tail conductor 122 are respectively connected to the adjacently arranged first conductor 1211 and/or second conductor 1212.

In the specific connection, the tail conductors 122 of the adjacent PCB windings 12 can be connected in order to realize the parallel connection of the adjacent PCB windings 12, or the tail conductors 122 of the upper PCB winding 12 and the input conductors 123 of the lower PCB winding 12 can be connected. Connect to realize the series connection of adjacent PCB windings 12.

Among them, the serial connection of adjacent PCB windings 12 is only suitable for three-phase motors, and the parallel connection of adjacent PCB windings 12 is more versatile.

In order to reduce the eddy currents of the first conductor 1211 and the second conductor 1212, in a specific embodiment of this solution, the first conductor 1211 and the second conductor 1212 are provided with hollow grooves.

As shown in FIGS. 1-6, the hollowed-out groove is opened along the extending direction of the length of the first conductor 1211 and the second conductor 1212.

Preferably, both the first conductor 1211 and the second conductor 1212 are copper conductors.

The solution also discloses a disc motor, which includes a stator, and the stator is the stator described in any one of the above solutions.

Since the stator has the above technical effect, the disc motor with the stator also has the same technical effect, which will not be repeated here.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A stator, suitable for a disc motor, characterized in that it comprises at least one PCB winding assembly (1), the PCB winding assembly (1) is stacked and arranged, and the PCB winding assembly (1) includes an insulating plate (11) and A plurality of PCB windings (12) are printed on the insulating board (11), the number of the PCB windings (12) is equal to the number of phases of the disc motor, and the plurality of PCB windings (12) are stacked and arranged The adjacent PCB windings (12) are sequentially connected, and the PCB windings (12) are provided with an input conductor (123) and a tail conductor (122),

The PCB winding (12) includes a plurality of coils (121), the number of the coils (121) is equal to the number of stages of the disc motor, and the coil (121) includes a layer located on the insulating plate (11). N first conductors (1211) arranged side by side and N second conductors (1212) arranged side by side on the lower layer of the insulating plate (11), the first conductor (1211) and the second conductor (1211) 1212) radially arranged, the outer end of the first conductor (1211) is connected to the outer end of the second outer end conductor (12113), and the inner end of the first conductor (1211) is connected to the second The inner end of the conductor (1212) is connected, and the position of one of the first conductor (1211) and the other of the coil (121) of one of the coils (121) of the two adjacent coils (121) The same first conductor (1211) is connected, and one of the second conductors (1212) of one of the coils (121) of the two adjacent coils (121) has the same position as the other coil (121) The second conductor (1212) is connected, where N is the number of turns, and N is a positive integer.
The stator according to claim 1, wherein the first conductor (1211) and the second conductor (1212) each comprise inner ends arranged in sequence from the middle to the end of the PCB winding (12) Part conductor (12111), working conductor (12112) and outer end conductor (12113),

The inner end conductor (12111) of the first conductor (1211) is connected to the inner end conductor (12111) of the second conductor (1212) corresponding to the position,

The outer end conductor (12113) of the first conductor (1211) is connected to the outer end conductor (12113) of the second conductor (1212) corresponding to the position.
The stator according to claim 1, wherein two adjacent coils (121) are connected by an auxiliary conductor assembly (1213), and the auxiliary conductor assembly (1213) comprises:

The first auxiliary conductor (12131) is located on the lower layer of the resin board. The first end of the first auxiliary conductor (12131) is connected to the first coil (121) of the two adjacent coils (121). A second conductor (1212) connection;

The second auxiliary conductor (12132) is located on the upper layer of the resin board and is arranged side by side with the first conductor (1211). The first end of the second auxiliary conductor (12132) is connected to the first end of the first auxiliary conductor (12131). The second end is connected, and the second end of the second auxiliary conductor (12132) is connected to one of the second conductors (1212) of the second coil (121) connected to the coil (121), so The position of the second conductor (1212) connected to the second coil (121) and the second auxiliary conductor (12132) is connected to the first coil (121) and the first auxiliary conductor (12131) The position of the second conductor (1212) is the same;

The third auxiliary conductor (12133) is located on the lower layer of the resin board, and the first end of the third auxiliary conductor (12133) is connected to one of the first conductors (1211) of the second coil (121) ；

The fourth auxiliary conductor (12134) is located on the upper layer of the resin board. The first end of the fourth auxiliary conductor (12134) is connected to the second end of the third auxiliary conductor (12133). The second end of the conductor (12134) is connected to one of the first conductors (1211) of the third coil (121) adjacent to the second coil (121), and the third coil (121) and The position of the first conductor (1211) connected to the fourth auxiliary conductor (12134) is the same as the position of the first conductor (1211) connected to the second coil (121) and the third auxiliary conductor (12133).
The stator according to claim 1, wherein the input conductors (123) are arranged on the N first conductors (1211) arranged side by side and/or the N second conductors (1212) arranged side by side. ).
The stator according to claim 1, characterized in that the tail conductors (1211) are provided on the N first conductors (1211) arranged side by side and/or the N second conductors (1212) arranged side by side. 122).
The stator according to claim 1, wherein the tail conductors (122) of adjacent PCB windings (12) are connected in sequence.
The stator according to claim 1, wherein the tail conductor (122) of the PCB winding (12) on the upper layer and the input conductor (123) of the PCB winding (12) on the lower layer )connect.
The stator according to claim 2, wherein the working conductor (12112) is provided with a hollow slot.
The stator according to claim 1, wherein the first conductor (1211) and the second conductor (1212) are copper conductors.
A disc motor, comprising a stator, characterized in that the stator is the stator according to any one of claims 1-9.