Stator and electric machine

Abstract

The utility model relates to a stator and motor. Prevent the space of coil from being smaller. The first coil has first winding part and second winding part. The second winding part is arranged on the first winding part or is arranged on the radial outer side relative to the first winding part. The second coil has third winding part and fourth winding part. The fourth winding part is arranged on the third winding part or is arranged on the radial outer side relative to the third winding part. The connecting part has first jumper wire and second jumper wire. The first jumper wire connects the first winding part and third winding part. The second jumper wire connects the second winding part and fourth winding part. The second jumper wire is arranged on the radial outer side relative to the first jumper wire.

Description

Technical Field

[0001] This utility model relates to stators and motors. Background Technology

[0002] The electric motor has a stator and a rotor. In an external rotor type motor, the rotor is positioned radially outward relative to the stator. The stator has a stator yoke, multiple teeth, and multiple coils (e.g., Patent Document 1). Each tooth extends radially outward from the stator yoke. Each coil is wound around each tooth.

[0003] The space on the outer periphery of the gap between the teeth, i.e., the slot, is larger than the space on the inner periphery. Therefore, each coil begins to wind from the inner periphery end of each tooth and ends at the outer periphery end of each tooth.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2024-040760

[0007] In the stator described above, coils are sometimes formed in each of a pair of adjacent teeth using a single winding. In this case, a jumper wire connecting the pair of coils extends. Each coil begins winding from its inner circumferential end and ends at its outer circumferential end, thus the jumper wire extends from the outer circumferential end of one tooth towards the inner circumferential end of the other. Because the jumper wire extends obliquely in this way, the space occupied by the jumper wire becomes larger, while the space available for forming the coils to avoid interference with the jumper wire becomes smaller. Utility Model Content

[0008] Technical problem to be solved by the utility model

[0009] The technical problem of this invention lies in preventing the space for forming the coil from becoming too small.

[0010] Technical solutions for solving technical problems

[0011] The stator according to the first embodiment includes a stator yoke, a first tooth, a second tooth, a first coil, a second coil, and a connecting portion. The stator yoke is cylindrical. The first tooth extends radially outward from the stator yoke. The second tooth extends radially outward from the stator yoke. The second tooth is adjacent to the first tooth. The first coil is mounted on the first tooth. The second coil is mounted on the second tooth. The connecting portion connects the first coil and the second coil. The first coil has a first winding portion and a second winding portion. The second winding portion is disposed on the first winding portion or radially outward relative to the first winding portion. The second coil has a third winding portion and a fourth winding portion. The fourth winding portion is disposed on the third winding portion or radially outward relative to the third winding portion. The connecting portion has a first jumper wire and a second jumper wire. The first jumper wire connects the first winding portion and the third winding portion. The second jumper wire connects the second winding portion and the fourth winding portion. The second jumper wire is radially outward relative to the first jumper wire.

[0012] According to this configuration, the first coil is first divided into a first winding section and a second winding section, and the second coil is divided into a third winding section and a fourth winding section. With this configuration, it is unnecessary for the jumper wire extending from the first coil toward the second coil to extend obliquely from the outer peripheral end of the first coil toward the inner peripheral end of the second coil. Therefore, the area that interferes with the jumper wire can be reduced, and the space for forming the coil can be prevented from becoming too small. Furthermore, since the first jumper wire is positioned radially inward relative to the second jumper wire, interference with the first jumper wire can be prevented when forming the second winding section and the fourth winding section.

[0013] The stator according to the second embodiment is configured in the stator according to the first embodiment as follows: The first bridging wire is inclined in a manner extending axially towards a first side from the first winding portion toward the third winding portion. The second bridging wire is inclined in a manner extending axially towards a second side from the second winding portion toward the fourth winding portion.

[0014] The stator involved in the third method is configured in the stator involved in the first or second method as follows: the second crossover line is inclined from the fourth winding portion toward the second winding portion towards the first crossover line.

[0015] The stator according to the fourth method, in any of the stators according to the first to third methods, is configured as follows: The second winding section is disposed on the first winding section. The fourth winding section is disposed on the third winding section.

[0016] The stator according to the fifth method is configured in any of the stators according to the first to fourth methods as follows: The second winding portion is arranged radially outward relative to the first winding portion.

[0017] The stator in the sixth method is constructed in any of the stators in the first to fifth methods as follows: the first winding section, the second winding section, the third winding section, and the fourth winding section are constructed from a single winding.

[0018] The stator in the seventh embodiment is constructed in any of the stators in the first to sixth embodiments as follows: The first and third winding sections are constructed using windings different from those constituting the second and fourth winding sections.

[0019] The stator according to the eighth method is configured in the same way as the stator according to the seventh method, in the following manner: the diameter of the wires constituting the second and fourth winding sections is smaller than the diameter of the wires constituting the first and third winding sections.

[0020] The ninth method involves a motor having a stator and a rotor as described in any of the first to eighth methods. The rotor is arranged radially outward relative to the stator.

[0021] The tenth method relates to a stator manufacturing method. This manufacturing method includes the following first to fifth steps. In the first step, a stator core having a first tooth and a second tooth adjacent to the first tooth is prepared. In the second step, a first winding portion is formed on the first tooth. In the third step, after the first winding portion is formed, a third winding portion is formed on the second tooth. In the fourth step, after the third winding portion is formed, a fourth winding portion is formed on the second tooth. In the fifth step, after the fourth winding portion is formed, a second winding portion is formed on the first tooth. A second jumper connecting the fourth winding portion and the second winding portion is arranged radially outward relative to the first jumper connecting the first winding portion and the third winding portion.

[0022] The manufacturing method involved in the eleventh method is a stator manufacturing method. This manufacturing method includes the following first to seventh steps. In the first step, a stator core having a first tooth, a second tooth adjacent to the first tooth, and a third tooth is prepared. In the second step, a first winding portion is formed on the first tooth. In the third step, after the first winding portion is formed, a third winding portion is formed on the second tooth. In the fourth step, after the third winding portion is formed, a fifth winding portion is formed on the third tooth. In the fifth step, after the fifth winding portion is formed, a second winding portion is formed on the first tooth. In the sixth step, after the second winding portion is formed, a fourth winding portion is formed on the second tooth. In the seventh step, after the fourth winding portion is formed, a sixth winding portion is formed on the third tooth. A second jumper connecting the second and fourth winding portions is arranged radially outward relative to the first jumper connecting the first and third winding portions. A fourth jumper connecting the fourth and sixth winding portions is arranged radially outward relative to the third jumper connecting the third and fifth winding portions.

[0023] The manufacturing method of the twelfth method, in addition to the manufacturing method of the tenth or eleventh method, further includes: a step of cutting off the first jumper wire and a step of cutting off the second jumper wire.

[0024] Utility Model Effect

[0025] According to this invention, the space for forming the coil can be ensured. Attached Figure Description

[0026] Figure 1 This is the front view of the motor.

[0027] Figure 2 This is an enlarged front view of the stator.

[0028] Figure 3 This is an enlarged cross-sectional view of the stator.

[0029] Figure 4 It is a perspective view showing the first, third, and fifth rolls of thread.

[0030] Figure 5 This is a perspective view showing the second, fourth, and sixth rolls of lines.

[0031] Figure 6 It is a three-dimensional diagram showing the first coil, the second coil, and the third coil.

[0032] Figure 7 This is an enlarged cross-sectional view of the stator involved in the modified example.

[0033] Figure 8 This is an enlarged cross-sectional view of the stator involved in the modified example.

[0034] Figure 9 This is an enlarged cross-sectional view of the stator involved in the modified example.

[0035] Figure 10 This is an enlarged cross-sectional view of the stator involved in the modified example.

[0036] Figure 11 This is an enlarged front view of the stator involved in the modified example.

[0037] Explanation of reference numerals in the attached figures

[0038] 2: Stator yoke; 3a: First tooth; 3b: Second tooth; 4a: First coil; 41a: First winding section; 42a: Second winding section; 4b: Second coil; 41b: Third winding section; 42b: Fourth winding section; 5a: First connecting section; 51a: First jumper wire; 52a: Second jumper wire; 20: Stator core; 100: Motor; 200: Rotor; 300: Stator. Detailed Implementation

[0039] Hereinafter, the stator 300, motor 100, and manufacturing method thereof according to this embodiment will be described with reference to the accompanying drawings. It should be noted that in the following description, axial direction refers to the direction in which the rotation axis O of the motor 100 extends. That is, the direction in which the central axis of the stator 300 extends. The first axial side is... Figures 1-3 The middle refers to the front side of the paper, and the second side is on the axis. Figures 1-3 "Middle" refers to the inner side of the paper. That is, the first axial side is the side opposite to the second axial side. Additionally, "circumferential" refers to the circumferential direction of the circle centered on the rotation axis O, and "radial" refers to the radial direction of the circle centered on the rotation axis O. Furthermore, "inner circumferential end" refers to the end of each component in the radial direction that is closer to the rotation axis O, and "outer circumferential end" refers to the end of each component in the radial direction that is farther from the rotation axis O.

[0040] <Electric motor>

[0041] like Figure 1 As shown, the motor 100 has a rotor 200 and a stator 300. The rotor 200 is arranged radially outward relative to the stator 300. That is, the motor 100 is an external rotor type.

[0042] <rotor>

[0043] The rotor 200 has a rotor yoke 201 and a plurality of permanent magnets 202. The rotor yoke 201 is cylindrical. Each permanent magnet 202 is fixed to the inner circumferential surface of the rotor yoke 201. The rotor 200 is configured to rotate about the rotation axis O.

[0044] <Stator>

[0045] The stator 300 has a stator yoke 2, multiple teeth 3, multiple coils 4, and multiple connecting parts 5. It should be noted that the stator core 20 is formed by the stator yoke 2 and the teeth 3. The stator yoke 2 and the teeth 3 are integrally formed. The stator core 20 is formed by stacking multiple electromagnetic steel plates. The stator 300 cannot rotate. The central axis of the stator 300 is aligned with the rotation axis O.

[0046] The stator yoke 2 is cylindrical. The central axis of the stator yoke 2 coincides with the rotation axis O. Each tooth 3 extends radially outward from the stator yoke 2. The teeth 3 are spaced apart from each other in the circumferential direction. An insulator 6 is arranged to cover each tooth 3 and the outer circumferential surface of the stator yoke 2.

[0047] like Figure 2 As shown, the plurality of teeth 3 includes a first tooth 3a and a second tooth 3b. The first tooth 3a and the second tooth 3b are adjacent to each other in the circumferential direction. In addition, the plurality of teeth 3 includes a third tooth 3c. The third tooth 3c is disposed next to the second tooth 3b.

[0048] The plurality of coils 4 includes a first coil 4a and a second coil 4b. The first coil 4a is mounted on a first tooth 3a. The second coil 4b is mounted on a second tooth 3b. Additionally, the plurality of coils 4 includes a third coil 4c. The third coil 4c is mounted on a third tooth 3c. Each coil 4 is constructed by winding a wire around each tooth 3. The wire is wound around each tooth 3 using a fork winding method. Therefore, a space equal to the diameter of the wire is required between adjacent coils 4.

[0049] The plurality of connecting parts 5 include a first connecting part 5a (an example of a connecting part). The first connecting part 5a connects the first coil 4a and the second coil 4b. Additionally, the plurality of connecting parts 5 include a second connecting part 5b. The second connecting part 5b connects the second coil 4b and the third coil 4c. It should be noted that other connecting parts 5 also connect adjacent coils 4 to each other. Thus, the first coil 4a, the second coil 4b, and the third coil 4c, connected to each other, constitute, for example, a U-phase coil.

[0050] Figure 3 This is an enlarged cross-sectional view of stator 300. (For example...) Figure 3 As shown, the first coil 4a has a first winding portion 41a and a second winding portion 42a. The first winding portion 41a is wound on the first tooth 3a. The first winding portion 41a is a cylindrical shape extending radially.

[0051] In this embodiment, the first winding section 41a has a two-layer structure formed by winding wire. That is, the first winding section 41a has a first layer formed by winding wire around the insulator 6 formed on the outer peripheral surface of the first tooth 3a, and a second layer formed by winding wire around the first layer. The first winding section 41a is formed by continuously winding wire without crossing over.

[0052] The second winding portion 42a is disposed on the first winding portion 41a. Furthermore, when the first winding portion 41a is radially divided into an inner peripheral portion and an outer peripheral portion, the second winding portion 42a is disposed on the outer peripheral portion of the first winding portion 41a. The second winding portion 42a is connected to the first winding portion 41a via a second coil 4b. Specifically, the second winding portion 42a is connected to the first winding portion 41a via a second coil 4b and a third coil 4c. That is, the second winding portion 42a is not directly connected to the first winding portion 41a. The second winding portion 42a is constructed from a winding of wire that is continuously wound without jumpers.

[0053] like Figure 2 and Figure 3 As shown, the second coil 4b has a third winding portion 41b and a fourth winding portion 42b. The third winding portion 41b is wound around the second tooth 3b. The third winding portion 41b is a cylindrical shape extending radially.

[0054] In this embodiment, the third winding portion 41b, like the first winding portion 41a, is a two-layer structure formed by winding. That is, the third winding portion 41b has a first layer formed by winding a wire around the insulator 6 formed on the outer peripheral surface of the second tooth 3b, and a second layer formed by winding a wire around the first layer. The third winding portion 41b is formed by continuously winding a wire without crossing over it.

[0055] The fourth winding portion 42b is disposed on the third winding portion 41b. Furthermore, when the third winding portion 41b is radially divided into an inner peripheral portion and an outer peripheral portion, the fourth winding portion 42b is disposed on the outer peripheral portion of the third winding portion 41b. The fourth winding portion 42b is connected to the third winding portion 41b via the third coil 4c. That is, the fourth winding portion 42b is not directly connected to the third winding portion 41b. The fourth winding portion 42b is constructed by continuously winding a coil of wire without jumpers.

[0056] The first connecting portion 5a has a first jumper wire 51a and a second jumper wire 52a. The first jumper wire 51a connects the first winding portion 41a and the third winding portion 41b. The first jumper wire 51a extends from the inner peripheral end of the first winding portion 41a toward the inner peripheral end of the third winding portion 41b. It should be noted that the inner peripheral end of the first winding portion 41a refers to the end of the two ends of the first winding portion 41a located on the rotation axis O side in the radial direction. Similarly, the inner peripheral end of the third winding portion 41b refers to the end of the two ends of the third winding portion 41b located on the rotation axis O side in the radial direction.

[0057] The second jumper wire 52a connects the second coil portion 42a and the fourth coil portion 42b. The second jumper wire 52a extends from the inner circumferential end of the second coil portion 42a toward the inner circumferential end of the fourth coil portion 42b. It should be noted that the inner circumferential end of the second coil portion 42a refers to the end of the second coil portion 42a located on the rotation axis O side in the radial direction. Similarly, the inner circumferential end of the fourth coil portion 42b refers to the end of the fourth coil portion 42b located on the rotation axis O side in the radial direction.

[0058] The second jumper wire 52a is positioned radially outward relative to the first jumper wire 51a. The first jumper wire 51a is inclined in a manner extending axially towards a first side from the first winding portion 41a toward the third winding portion 41b. On the other hand, the second jumper wire 52a is inclined in a manner extending axially towards a second side from the second winding portion 42a toward the fourth winding portion 42b. That is, the first jumper wire 51a and the second jumper wire 52a are inclined in opposite directions to each other.

[0059] The second jumper wire 52a is inclined in a manner that approaches the first jumper wire 51a from the fourth coil portion 42b toward the second coil portion 42a. That is, the second jumper wire 52a is inclined radially inward from the fourth coil portion 42b toward the second coil portion 42a.

[0060] The first jumper wire 51a is inclined in a direction away from the second jumper wire 52a from the first winding portion 41a toward the third winding portion 41b. That is, the first jumper wire 51a is inclined radially inward from the first winding portion 41a toward the third winding portion 41b.

[0061] The first coil portion 41a, the second coil portion 42a, the third coil portion 41b, and the fourth coil portion 42b are formed by a single coil. That is, the first coil 4a and the second coil 4b are formed by a single coil. It should be noted that in this embodiment, the first coil 4a, the second coil 4b, and the third coil 4c next to the second coil 4b are formed by a single coil.

[0062] <Stator Manufacturing Method>

[0063] First, a stator core 20 having a first tooth 3a and a second tooth 3b is prepared. Furthermore, a first winding section 41a is formed on the first tooth 3a using a fly fork winding machine. Specifically, with... Figure 3 The first layer of the first coiled portion 41a is formed by winding the thread from the inner peripheral end to the outer peripheral end of the first tooth 3a in the order indicated by the arrows. Furthermore, a second layer of the first coiled portion 41a is formed by winding the thread from the outer peripheral end to the inner peripheral end of the first tooth 3a over the first layer of the first coiled portion 41a. Thus, the first coiled portion 41a is formed on the first tooth 3a.

[0064] Next, a third winding portion 41b is formed on the second tooth 3b using the same winding as that constituting the first winding portion 41a. Specifically, the first jumper wire 51a is extended from the inner peripheral end of the first winding portion 41a to the inner peripheral end of the second tooth 3b. Furthermore, with... Figure 3 In the order indicated by the arrows, the yarn is wound from the inner peripheral end to the outer peripheral end of the second tooth 3b to form the first layer of the third yarn portion 41b. Furthermore, on top of the first layer of the third yarn portion 41b, the yarn is wound from the outer peripheral end to the inner peripheral end of the second tooth 3b to form the second layer of the third yarn portion 41b. Thus, the third yarn portion 41b is formed on the second tooth 3b. It should be noted that the winding direction of the third yarn portion 41b is opposite to the winding direction of the first yarn portion 41a. In this embodiment, viewed from the radially outer side, the first yarn portion 41a is wound clockwise, and the third yarn portion 41b is wound counterclockwise.

[0065] Next, a third coil 4c is formed on the third tooth 3c adjacent to the second tooth 3b by winding the same wire as that constituting the third winding portion 41b. Specifically, the third coil 4c, like the first coil 4a and the second coil 4b, has a fifth winding portion 41c and a sixth winding portion 42c. Furthermore, the third coil 4c is connected to the second coil 4b via a second connecting portion 5b. The second connecting portion 5b has a third jumper wire 51b and a fourth jumper wire 52b.

[0066] First, a fifth coil portion 41c is formed on the third tooth 3c. Specifically, the third jumper wire 51b is extended from the inner peripheral end of the third coil portion 41b to the inner peripheral end of the third tooth 3c. Furthermore, the coil is wound from the inner peripheral end to the outer peripheral end of the third tooth 3c to form a first layer of the fifth coil portion 41c. Then, on top of this first layer, the coil is wound from the outer peripheral end to the inner peripheral end of the third tooth 3c to form a second layer of the fifth coil portion 41c. It should be noted that the winding direction of the fifth coil portion 41c is opposite to the winding direction of the third coil portion 41b. In this embodiment, viewed from the radially outer side, the fifth coil portion 41c is wound clockwise. Figure 4 The diagram illustrates this structure. It should be noted that... Figure 4 This is a perspective view showing the first coil 41a, the third coil 41b, and the fifth coil 41c.

[0067] Next, a sixth coil 42c is formed on the fifth coil 41c. Specifically, the coil is wound from the center of the third tooth 3c to its outer periphery to form the first layer of the sixth coil 42c, and then the coil is wound from the outer periphery of the third tooth 3c to its center on this first layer to form the second layer of the sixth coil 42c. It should be noted that the winding direction of the sixth coil 42c is the same as the winding direction of the fifth coil 41c. Thus, the sixth coil 42c is completed on the fifth coil 41c, thereby completing the third coil 4c.

[0068] Next, a fourth winding portion 42b is formed on the second tooth 3b using the same winding as that constituting the third coil 4c. Specifically, the fourth crossover wire 52b extends from the center of the third coil 4c to the center of the third winding portion 41b. The fourth crossover wire 52b is positioned radially outward relative to the third crossover wire 51b. Furthermore, with... Figure 3Following the sequence indicated by the arrows, the wire is wound from the center of the second tooth 3b to its outer periphery, forming the first layer of the fourth wire portion 42b on the third wire portion 41b. Furthermore, on top of the first layer of the fourth wire portion 42b, the wire is wound from the outer periphery of the second tooth 3b to its center, forming the second layer of the fourth wire portion 42b. It should be noted that the winding direction of the fourth wire portion 42b is the same as the winding direction of the third wire portion 41b. Thus, the fourth wire portion 42b is formed on the third wire portion 41b, thereby completing the second coil 4b.

[0069] Next, a second winding portion 42a is formed on the first tooth 3a using the same winding as that constituting the second coil 4b. Specifically, a second jumper wire 52a is extended from the inner circumferential end of the fourth winding portion 42b (the central portion of the second coil 4b) to the central portion of the first winding portion 41a. The second jumper wire 52a is positioned radially outward relative to the first jumper wire 51a. Furthermore, with... Figure 3 Following the sequence indicated by the arrows, the wire is wound from the center of the first tooth 3a to the outer periphery to form the first layer of the second wire portion 42a on the first wire portion 41a. Furthermore, on top of the first layer of the second wire portion 42a, the wire is wound from the outer periphery to the center of the first tooth 3a to form the second layer of the second wire portion 42a. It should be noted that the winding direction of the second wire portion 42a is the same as the winding direction of the first wire portion 41a. Thus, the second wire portion 42a is formed on the first wire portion 41a, thereby completing the first coil 4a.

[0070] Figure 5 A perspective view is shown of the second thread section 42a, the fourth thread section 42b, and the sixth thread section 42c formed as described above. Figure 6 A three-dimensional view of the first coil 4a, the second coil 4b, and the third coil 4c is shown.

[0071] like Figures 4-6 As shown, the first coil 4a is divided into a first winding portion 41a and a second winding portion 42a, and the second coil 4b is divided into a third winding portion 41b and a fourth winding portion 42b. Furthermore, the first winding portion 41a, the third winding portion 41b, the fourth winding portion 42b, and the second winding portion 42a are formed sequentially. A second jumper wire 52a extending from the fourth winding portion 42b toward the second winding portion 42a is positioned radially outward relative to the first jumper wire 51a extending from the first winding portion 41a toward the third winding portion 41b.

[0072] [Variation Example]

[0073] The embodiments of this utility model have been described above, but this utility model is not limited thereto, and various modifications can be made within the scope of the spirit of this utility model. It should be noted that the following modifications can be applied simultaneously.

[0074] (a) such as Figure 7 As shown, the second winding portion 42a may also be arranged radially outward relative to the first winding portion 41a. Similarly, the fourth winding portion 42b may also be arranged radially outward relative to the third winding portion 41b.

[0075] (b) In the above embodiment, although the first coil 4a is composed of a first winding portion 41a and a second winding portion 42a, and the second coil 4b is composed of a third winding portion 41b and a fourth winding portion 42b, the first coil 4a and the second coil 4b are not limited to these. For example, such as Figure 8 As shown, the second coil 4b may also have a seventh coil 43b in addition to the third coil portion 41b and the fourth coil portion 42b. The seventh coil portion 43b may also be disposed on the fourth coil portion 42b, or it may be disposed radially outward relative to the fourth coil portion 42b.

[0076] In this configuration, the first connecting portion 5a, in addition to the first jumper wire 51a and the second jumper wire 52a, also has a fifth jumper wire 53a. The fifth jumper wire 53a connects the second winding portion 42a and the seventh winding portion 43b. The fifth jumper wire 53a is positioned radially outward relative to the second jumper wire 52a. It should be noted that the first coil 4a may also have other winding portions besides the first winding portion 41a and the second winding portion 42a.

[0077] (c) such as Figure 9 As shown, the wires constituting the first winding section 41a and the third winding section 41b may be different from the wires constituting the second winding section 42a and the fourth winding section 42b. In this case, the wire diameter of the wire constituting the second winding section 42a and the fourth winding section 42b can be smaller than the wire diameter of the wire constituting the first winding section 41a and the third winding section 41b. Therefore, the distance between the first coil 4a and the second coil 4b can be smaller than the diameter of the wires constituting the first winding section 41a and the third winding section 41b. Furthermore, the wires constituting the first winding section 41a and the third winding section 41b and the wires constituting the second winding section 42a and the fourth winding section 42b can be connected to each other by wiring.

[0078] It should be noted that when the wire diameter constituting the second winding section 42a and the fourth winding section 42b is reduced, the cross-sectional area decreases and the allowable current decreases. Therefore, for example, as Figure 10As shown, the first coil 4a may also have an eighth winding portion 43a, and the second coil 4b may also have a seventh winding portion 43b. The seventh winding portion 43b and the eighth winding portion 43a are constructed using windings different from those constituting the second winding portion 42a and the fourth winding portion 42b. Furthermore, the windings constituting the seventh winding portion 43b and the eighth winding portion 43a, as well as the windings constituting the second winding portion 42a and the fourth winding portion 42b, are connected in parallel. By ensuring that the total cross-sectional area of ​​the windings constituting the seventh winding portion 43b and the eighth winding portion 43a, and the cross-sectional area of ​​the windings constituting the second winding portion 42a and the fourth winding portion 42b, is equal to or greater than the cross-sectional area of ​​the windings constituting the first winding portion 41a and the third winding portion 41b, a decrease in allowable current can be prevented.

[0079] (d) In the above embodiment, since the first coil 4a, the second coil 4b, and the third coil 4c are formed by a single winding, they are connected to each other. However, the configuration of the stator 300 is not limited to this. For example, the first jumper wire 51a and the second jumper wire 52a may be cut after the first coil 4a and the second coil 4b are formed. Alternatively, the third jumper wire 51b and the fourth jumper wire 52b may be cut after the second coil 4b and the third coil 4c are formed. Thus, for example, the first coil 4a can be made a U-phase coil, and the second coil 4b can be made a V-phase coil.

[0080] (e) The third tooth 3c may not be adjacent to the second tooth 3b. That is, at least one tooth 3 may be arranged between the second tooth 3b and the third tooth 3c. In this case, the third coil 4c is also not adjacent to the second coil 4b. That is, at least one coil 4 may be arranged between the second coil 4b and the third coil 4c.

[0081] (f) In the above embodiment, although the first coil 4a and the second coil 4b are connected to the third coil 4c, the configuration of the stator 300 is not limited to this. For example, the first coil 4a and the second coil 4b may not be connected to the third coil 4c. That is, the stator 300 may not have the second connecting portion 5b. In this case, the fourth winding portion 42b is directly connected to the third winding portion 41b.

[0082] (g) In the above embodiment, the first thread section 41a, the third thread section 41b, the fifth thread section 41c, the sixth thread section 42c, the fourth thread section 42b, and the second thread section 42a are formed sequentially, but the order in which the thread sections are formed is not limited to this. For example, as Figure 11As shown, the winding sections can also be formed in the order of first winding section 41a, third winding section 41b, fifth winding section 41c, second winding section 42a, fourth winding section 42b, and sixth winding section 42c. In this case, the stator 300 has a jumper wire 54 extending from the fifth winding section 41c to the second winding section 42a. This jumper wire 54 extends, for example, at the end of the coil. That is, the jumper wire 54 is arranged on either the first axial side or the second axial side relative to each coil 4a to 4c.

[0083] In this modified example, the first jumper wire 51a and the second jumper wire 52a are inclined in a manner extending axially towards a first side from the first coil 4a toward the second coil 4b. That is, the first jumper wire 51a and the second jumper wire 52a are inclined in the same direction relative to each other. Furthermore, the third jumper wire 51b and the fourth jumper wire 52b are inclined in a manner extending axially towards a second side from the second coil 4b toward the third coil 4c. That is, the third jumper wire 51b and the fourth jumper wire 52b are inclined in the same direction relative to each other.

Claims

1. A stator, characterized in that, have: Cylindrical stator yoke; The first tooth extends radially outward from the stator yoke; The second tooth extends radially outward from the stator yoke and is adjacent to the first tooth; The first coil is mounted on the first tooth; The second coil is mounted on the second tooth; as well as The connecting part connects the first coil and the second coil. The first coil has: First roll of thread; as well as The second thread portion is disposed on the first thread portion, or disposed radially outward relative to the first thread portion. The second coil has: Volume 3, Line Section; and The fourth thread section is disposed on the third thread section, or disposed radially outward relative to the third thread section. The connecting portion has: A first jumper wire connects the first coil section and the third coil section; and The second jumper connects the second coil portion and the fourth coil portion, and is arranged radially outward relative to the first jumper.

2. The stator according to claim 1, characterized in that, The first jumper wire is inclined in such a way that it extends axially toward a first side from the first coil portion toward the third coil portion. The second jumper wire is inclined in such a way that it extends axially to the second side from the second coil portion toward the fourth coil portion.

3. The stator according to claim 1, characterized in that, The second jumper is inclined in such a way that it approaches the first jumper from the fourth coil portion toward the second coil portion.

4. The stator according to claim 1, characterized in that, The second winding section is disposed on the first winding section. The fourth thread section is disposed on the third thread section.

5. The stator according to claim 1, characterized in that, The second winding portion is positioned radially outward relative to the first winding portion.

6. The stator according to claim 1, characterized in that, The first winding section, the second winding section, the third winding section, and the fourth winding section are constituted by a single winding.

7. The stator according to claim 1, characterized in that, The first winding section and the third winding section are constructed using windings that are different from the windings that constitute the second winding section and the fourth winding section.

8. The stator according to claim 7, characterized in that, The diameter of the wires constituting the second and fourth winding portions is smaller than the diameter of the wires constituting the first and third winding portions.

9. An electric motor, characterized in that, have: The stator according to any one of claims 1 to 8; and The rotor is arranged radially outward relative to the stator.

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