Stator and method of manufacturing the same

Abstract

Provided is a stator and a manufacturing method thereof, in which segmented conductors can be easily connected to each other in slots. First to fourth slots are provided on an inner circumferential surface of a stator core. Coils have first to third segmented conductors. Each segmented conductor has a U shape. The first segmented conductor is inserted into the first and second slots in a state in which a connecting portion faces a first end surface. The second segmented conductor is inserted into the second and third slots in a state in which a connecting portion faces a second end surface. The third segmented conductor is inserted into the third and fourth slots in a state in which a connecting portion faces the first end surface. A front end portion of the first segmented conductor and a front end portion of the second segmented conductor are electrically connected to each other in the second slot in a state in which they overlap in a circumferential direction. A front end portion of the second segmented conductor and a front end portion of the third segmented conductor are electrically connected to each other in the third slot in a state in which they overlap in the circumferential direction.

Description

TECHNICAL FIELD

[0001] The technology disclosed in the present application relates to a stator and a manufacturing method thereof. BACKGROUND

[0002] In Japanese Patent Application Publication No. 2019-129658, a stator of an electric motor is disclosed. The stator has a stator core of a cylindrical shape. A plurality of slots are provided on an inner peripheral surface of the stator core at intervals in the circumferential direction. Coils are fixed to the stator core. The coils are composed of a plurality of segment conductors having a U shape. A part of the segment conductors is inserted into the corresponding slots from one end portion (hereinafter, referred to as a first end portion) of the stator. The remaining segment conductors are inserted into the corresponding slots from the other end portion (hereinafter, referred to as a second end portion) of the stator. In each slot, the leading end portions of the segment conductors inserted into the slot from the first end portion and the leading end portions of the segment conductors inserted into the slot from the second end portion overlap in the radial direction of the stator core, and are electrically connected. In this way, the coils are composed of the segment conductors electrically connected to each other. SUMMARY

[0003] PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] As described above, in the stator of Japanese Patent Application Publication No. 2019-129658, in each slot, the leading end portions of the segment conductors are connected to each other in a state of overlapping in the radial direction of the stator core. Therefore, in the manufacturing process of the stator, it is necessary to stack the leading end portions of the segment conductors in the radial direction of the stator core in each slot, and to press the stacked portion in the radial direction of the stator core, thereby connecting the leading end portions of the segment conductors to each other. Therefore, a jig or a member for pressing the stacked portion of the leading end portions of the segment conductors is required. In the present specification, a stator in which the leading end portions of the segment conductors can be easily connected to each other in each slot is proposed.

[0005] METHOD FOR SOLVING THE PROBLEM

[0006] The stator disclosed in the present specification has a stator core having a cylindrical shape, and a coil fixed to the stator core. The stator core has a first end surface and a second end surface arranged on both sides in the axial direction of the stator core. A first slot, a second slot, a third slot, and a fourth slot are provided on the inner peripheral surface of the stator core. The first slot, the second slot, the third slot, and the fourth slot each extend from the first end surface to the second end surface along the axial direction. The coil has a first segment conductor, a second segment conductor, and a third segment conductor. The first segment conductor, the second segment conductor, and the third segment conductor each have a U-shaped form having a first linear portion, a second linear portion, and a connecting portion that connects the first linear portion and the second linear portion. The connecting portion of the first segment conductor is arranged at a position facing the first end surface. The first linear portion of the first segment conductor is inserted into the first slot. The second linear portion of the first segment conductor is inserted into the second slot. The connecting portion of the second segment conductor is arranged at a position facing the second end surface. The first linear portion of the second segment conductor is inserted into the second slot. The second linear portion of the second segment conductor is inserted into the third slot. The connecting portion of the third segment conductor is arranged at a position facing the first end surface. The first linear portion of the third segment conductor is inserted into the third slot. The second linear portion of the third segment conductor is inserted into the fourth slot. The leading end portion of the second linear portion of the first segment conductor and the leading end portion of the first linear portion of the second segment conductor are electrically connected to each other in the second slot in a state of overlapping in the circumferential direction of the stator core. The leading end portion of the second linear portion of the second segment conductor and the leading end portion of the first linear portion of the third segment conductor are electrically connected to each other in the third slot in a state of overlapping in the circumferential direction of the stator core.

[0007] In the stator, in each slot, the leading end portions of the segment conductors are electrically connected to each other in a state of overlapping in the circumferential direction of the stator core. Therefore, the leading end portions of the segment conductors can be easily connected to each other in each slot.

[0008] Further, the present specification discloses a manufacturing method of a stator. The manufacturing method has a process of fixing a coil on a stator core having a cylindrical shape. The aforementioned stator core has a first end surface and a second end surface arranged on both sides in an axial direction of the aforementioned stator core. A first slot, a second slot, a third slot, and a fourth slot are provided on an inner peripheral surface of the aforementioned stator core. The aforementioned first slot, the aforementioned second slot, the aforementioned third slot, and the aforementioned fourth slot respectively extend from the aforementioned first end surface to the aforementioned second end surface along the aforementioned axial direction. The aforementioned coil has a first segment conductor, a second segment conductor, and a third segment conductor. The aforementioned first segment conductor, the aforementioned second segment conductor, and the aforementioned third segment conductor respectively have a U shape having a first linear portion, a second linear portion, and a connecting portion that connects the aforementioned first linear portion and the aforementioned second linear portion. The process of fixing the aforementioned coil on the aforementioned stator core has a first process to a third process. In the aforementioned first process, the aforementioned connecting portion of the aforementioned first segment conductor is arranged at a position facing the aforementioned first end surface, the aforementioned first linear portion of the aforementioned first segment conductor is inserted into the aforementioned first slot, and the aforementioned second linear portion of the aforementioned first segment conductor is inserted into the aforementioned second slot, whereby the aforementioned first segment conductor is mounted on the aforementioned stator core. In the aforementioned second process, the aforementioned connecting portion of the aforementioned second segment conductor is arranged at a position facing the aforementioned second end surface, the aforementioned first linear portion of the aforementioned second segment conductor is inserted into the aforementioned second slot, and the aforementioned second linear portion of the aforementioned second segment conductor is inserted into the aforementioned third slot, whereby the aforementioned second segment conductor is mounted on the aforementioned stator core. In the aforementioned third process, the aforementioned connecting portion of the aforementioned third segment conductor is arranged at a position facing the aforementioned first end surface, the aforementioned first linear portion of the aforementioned third segment conductor is inserted into the aforementioned third slot, and the aforementioned second linear portion of the aforementioned third segment conductor is inserted into the aforementioned fourth slot, whereby the aforementioned third segment conductor is mounted on the aforementioned stator core. The aforementioned process of fixing the aforementioned coil on the aforementioned stator core is performed in such a manner that a leading end portion of the aforementioned second linear portion of the aforementioned first segment conductor and a leading end portion of the aforementioned first linear portion of the aforementioned second segment conductor are electrically connected to each other in the aforementioned second slot in a state of overlapping in a peripheral direction of the aforementioned stator core, and a leading end portion of the aforementioned second linear portion of the aforementioned second segment conductor and a leading end portion of the aforementioned first linear portion of the aforementioned third segment conductor are electrically connected to each other in the aforementioned third slot in a state of overlapping in the peripheral direction of the aforementioned stator core.

[0009] In the manufacturing method, in each slot, the leading end portions of the segment conductors are electrically connected to each other in a state of overlapping in the peripheral direction of the stator core. Therefore, the leading end portions of the segment conductors can be easily connected to each other in each slot. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a perspective view of a stator.

[0011] Figure 2is a perspective view of the stator core.

[0012] Figure 3 is a sectional view of the stator core in a plane orthogonal to the axis Zl.

[0013] Figure 4 is a perspective view of the coil wire of Embodiment 1.

[0014] Figure 5 is a side view of the segment conductor of Embodiment 1.

[0015] Figure 6 is a view showing the mounting structure of the segment conductor of Embodiment 1 to the stator core.

[0016] Figure 7 is a sectional view of the slot and the coil wire of Embodiment 1 in a plane orthogonal to the axis Zl.

[0017] Figure 8 is a sectional view of the slot and the coil wire of Embodiment 2 in a plane orthogonal to the axis Zl.

[0018] Figure 9 is a view showing a modification of Embodiment 2.

[0019] Figure 10 is a side view of the segment conductor of Embodiment 3.

[0020] Figure 11 is a view showing the mounting structure of the segment conductor of Embodiment 3 to the stator core.

[0021] Figure 12 is an explanatory view of the coil of the modification.

[0022] Figure 13 is an explanatory view of the coil of the modification.

[0023] Figure 14 is an explanatory view of the coil of the modification. DETAILED DESCRIPTION

[0024] In the stator of one example disclosed in the present specification, the first slot, the second slot, the third slot, and the fourth slot can be provided at intervals in the circumferential direction of the stator core in the order of the first slot, the second slot, the third slot, and the fourth slot on the inner peripheral surface of the stator core.

[0025] According to this structure, the coil of a wave shape can be configured by each segment conductor.

[0026] The stator according to an example disclosed in the present specification can also have the following structure. That is, in the aforementioned second slot, the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segment conductor can be disposed closer to the aforementioned third slot side than the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segment conductor. In the aforementioned third slot, the aforementioned front end portion of the aforementioned first linear portion of the aforementioned third segment conductor can be disposed closer to the aforementioned second slot side than the aforementioned front end portion of the aforementioned second linear portion of the aforementioned second segment conductor. The aforementioned first segment conductor can be fixed to the aforementioned stator core in a state in which the aforementioned connecting portion of the aforementioned first segment conductor is elastically deformed in a direction in which a gap between the aforementioned first linear portion of the aforementioned first segment conductor and the aforementioned second linear portion of the aforementioned first segment conductor is expanded. The aforementioned second segment conductor can be fixed to the aforementioned stator core in a state in which the aforementioned connecting portion of the aforementioned second segment conductor is elastically deformed in a direction in which a gap between the aforementioned first linear portion of the aforementioned second segment conductor and the aforementioned second linear portion of the aforementioned second segment conductor is expanded. The aforementioned third segment conductor can be fixed to the aforementioned stator core in a state in which the aforementioned connecting portion of the aforementioned third segment conductor is elastically deformed in a direction in which a gap between the aforementioned first linear portion of the aforementioned third segment conductor and the aforementioned second linear portion of the aforementioned third segment conductor is expanded.

[0027] According to this structure, the connecting surfaces of the front end portions of the segment conductors are pressed against each other by the reaction force based on the elastic deformation of each segment conductor. Therefore, the front end portions of the segment conductors can be appropriately connected to each other.

[0028] The stator according to an example disclosed in the present specification can also have the following structure. That is, a recess can be formed in the side surface of the aforementioned first slot side of the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segment conductor. A recess can be formed in the side surface of the aforementioned third slot side of the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segment conductor. In the aforementioned second slot, the aforementioned recess of the aforementioned second linear portion of the aforementioned first segment conductor can be in contact with the aforementioned recess of the aforementioned first linear portion of the aforementioned second segment conductor. A recess can be formed in the side surface of the aforementioned second slot side of the aforementioned front end portion of the aforementioned second linear portion of the aforementioned second segment conductor. A recess can be formed in the side surface of the aforementioned fourth slot side of the aforementioned front end portion of the aforementioned first linear portion of the aforementioned third segment conductor. In the aforementioned third slot, the aforementioned recess of the aforementioned second linear portion of the aforementioned second segment conductor can be in contact with the aforementioned recess of the aforementioned first linear portion of the aforementioned third segment conductor.

[0029] The stator according to an example disclosed in the present specification can also have the following structure. That is, in the second slot, the front end portion of the second linear portion of the first segment conductor can be disposed closer to the side of the first slot than the front end portion of the first linear portion of the second segment conductor. In the third slot, the front end portion of the first linear portion of the third segment conductor can be disposed closer to the side of the fourth slot than the front end portion of the second linear portion of the second segment conductor. The first segment conductor can be fixed to the stator core in a state in which the connecting portion of the first segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the first segment conductor and the second linear portion of the first segment conductor is reduced. The second segment conductor can be fixed to the stator core in a state in which the connecting portion of the second segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the second segment conductor and the second linear portion of the second segment conductor is reduced. The third segment conductor can be fixed to the stator core in a state in which the connecting portion of the third segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the third segment conductor and the second linear portion of the third segment conductor is reduced.

[0030] According to this structure, the connecting surfaces of the front end portions of the segment conductors to each other are pressed by the reaction force based on the elastic deformation of each segment conductor. Therefore, the front end portions of the segment conductors can be appropriately connected to each other.

[0031] The stator according to an example disclosed in the present specification can also have the following structure. A recess can be formed in the side surface of the fourth slot side of the front end portion of the second linear portion of the first segment conductor. A recess can be formed in the side surface of the first slot side of the front end portion of the first linear portion of the second segment conductor. In the second slot, the recess of the second linear portion of the first segment conductor can be in contact with the recess of the first linear portion of the second segment conductor. A recess can be formed in the side surface of the fourth slot side of the front end portion of the second linear portion of the second segment conductor. A recess can be formed in the side surface of the second slot side of the front end portion of the first linear portion of the third segment conductor. In the third slot, the recess of the second linear portion of the second segment conductor can be in contact with the recess of the first linear portion of the third segment conductor.

[0032] The stator disclosed in the present specification can also have the following structure. That is, in a cross section orthogonal to the aforementioned axial direction, the contact surface of the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segment conductor and the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segment conductor can also be inclined with respect to the radial direction of the aforementioned stator core. A protrusion can also be provided on the side surface of the aforementioned second slot. In the aforementioned second slot, a plurality of coil wires including coil wires composed of the aforementioned first segment conductor and the aforementioned second segment conductor can also be stacked in the aforementioned radial direction. The aforementioned plurality of coil wires can be fixed in a state in which they are compressed in the aforementioned radial direction between the aforementioned protrusion of the aforementioned second slot and the bottom surface of the aforementioned second slot.

[0033] According to this structure, a force that compresses the plurality of coil wires in the radial direction is applied to the contact surface of the front end portion of the second linear portion of the first segment conductor and the front end portion of the first linear portion of the second segment conductor. Therefore, the front end portion of the second linear portion of the first segment conductor and the front end portion of the first linear portion of the second segment conductor can be connected more reliably.

[0034] The manufacturing method of the stator disclosed in the present specification can also have the following structure. That is, the aforementioned procedure in which the aforementioned coil is fixed to the aforementioned stator core can be performed in such a manner that the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segment conductor is disposed closer to the side of the aforementioned third slot than the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segment conductor in the aforementioned second slot, and the aforementioned front end portion of the aforementioned first linear portion of the aforementioned third segment conductor is disposed closer to the side of the aforementioned second slot than the aforementioned front end portion of the aforementioned second linear portion of the aforementioned second segment conductor in the aforementioned third slot. In the aforementioned procedure in which the aforementioned coil is fixed to the aforementioned stator core, the aforementioned first segment conductor can be mounted to the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned first segment conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned first segment conductor and the aforementioned second linear portion of the aforementioned first segment conductor is expanded. In the aforementioned procedure in which the aforementioned second segment conductor is mounted to the aforementioned stator core, the aforementioned second segment conductor can be mounted to the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned second segment conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned second segment conductor and the aforementioned second linear portion of the aforementioned second segment conductor is expanded. In the aforementioned procedure in which the aforementioned third segment conductor is mounted to the aforementioned stator core, the aforementioned third segment conductor can be mounted to the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned third segment conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned third segment conductor and the aforementioned second linear portion of the aforementioned third segment conductor is expanded.

[0035] According to this structure, the connecting surfaces of the front end portions of the segment conductors are pressed against each other by the reaction force based on the elastic deformation of each segment conductor. Therefore, the front end portions of the segment conductors can be appropriately connected to each other.

[0036] In the manufacturing method of the stator disclosed in one example of the present specification, the first slot, the second slot, the third slot, and the fourth slot can be provided on the inner circumferential surface of the stator core at intervals in the circumferential direction of the stator core in this order.

[0037] According to this structure, the coil of the wave shape can be configured by the segment conductors.

[0038] The manufacturing method of the stator disclosed in one example of the present specification can have the following structure. That is, a recess can be formed on the inner side surface of the front end portion of the second linear portion of the first segment conductor. A recess can be formed on the inner side surface of the front end portion of the first linear portion of the second segment conductor. A recess can be formed on the inner side surface of the front end portion of the second linear portion of the second segment conductor. A recess can be formed on the inner side surface of the front end portion of the first linear portion of the third segment conductor. The manner in which the process of fixing the coil to the stator core can be performed such that the recess of the second linear portion of the first segment conductor contacts the recess of the first linear portion of the second segment conductor in the second slot, and the recess of the second linear portion of the second segment conductor contacts the recess of the first linear portion of the third segment conductor in the third slot.

[0039] The manufacturing method of the stator disclosed in the present specification can also have the following structure. That is, the manner in which the aforementioned procedure of fixing the aforementioned coil on the aforementioned stator core can be such that the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segmented conductor is disposed closer to one side of the aforementioned first slot than the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segmented conductor in the aforementioned second slot, and the aforementioned front end portion of the aforementioned first linear portion of the aforementioned third segmented conductor is disposed closer to one side of the aforementioned fourth slot than the aforementioned front end portion of the aforementioned second linear portion of the aforementioned second segmented conductor in the aforementioned third slot. In the aforementioned procedure of mounting the aforementioned first segmented conductor on the aforementioned stator core, the aforementioned first segmented conductor can be mounted on the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned first segmented conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned first segmented conductor and the aforementioned second linear portion of the aforementioned first segmented conductor is reduced. In the aforementioned procedure of mounting the aforementioned second segmented conductor on the aforementioned stator core, the aforementioned second segmented conductor can be mounted on the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned second segmented conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned second segmented conductor and the aforementioned second linear portion of the aforementioned second segmented conductor is reduced. In the aforementioned procedure of mounting the aforementioned third segmented conductor on the aforementioned stator core, the aforementioned third segmented conductor can be mounted on the aforementioned stator core in a state in which the aforementioned link portion of the aforementioned third segmented conductor has been elastically deformed in a direction in which the interval between the aforementioned first linear portion of the aforementioned third segmented conductor and the aforementioned second linear portion of the aforementioned third segmented conductor is reduced.

[0040] According to this structure, the connecting surfaces of the front end portions of the segmented conductors to each other are pressed by the reaction force based on the elastic deformation of each segmented conductor. Therefore, the front end portions of the segmented conductors can be appropriately connected to each other.

[0041] The manufacturing method of the stator disclosed in the present specification can also have the following structure. That is, a recess can be formed on the outer side surface of the aforementioned front end portion of the aforementioned second linear portion of the aforementioned first segmented conductor. A recess can be formed on the outer side surface of the aforementioned front end portion of the aforementioned first linear portion of the aforementioned second segmented conductor. A recess can be formed on the outer side surface of the aforementioned front end portion of the aforementioned second linear portion of the aforementioned second segmented conductor. A recess can be formed on the outer side surface of the aforementioned front end portion of the aforementioned first linear portion of the aforementioned third segmented conductor. The aforementioned procedure of fixing the aforementioned coil on the aforementioned stator core can be such that the aforementioned recess of the aforementioned second linear portion of the aforementioned first segmented conductor is in contact with the aforementioned recess of the aforementioned first linear portion of the aforementioned second segmented conductor in the aforementioned second slot, and the aforementioned recess of the aforementioned second linear portion of the aforementioned second segmented conductor is in contact with the aforementioned recess of the aforementioned first linear portion of the aforementioned third segmented conductor in the aforementioned third slot.

[0042] The stator manufacturing method disclosed in this specification can also have the following structure. That is, with the aforementioned first segment conductor and the aforementioned second segment conductor mounted on the stator core, in a cross section orthogonal to the aforementioned axial direction, the contact surface between the aforementioned front end of the aforementioned second linear portion of the aforementioned first segment conductor and the aforementioned front end of the aforementioned first linear portion of the aforementioned second segment conductor can also be inclined relative to the radial direction of the aforementioned stator core. A protrusion can also be provided on the side of the aforementioned second slot. In the aforementioned process of fixing the aforementioned coil on the aforementioned stator core, multiple coil wires comprising coil wires formed by the aforementioned first segment conductor and the aforementioned second segment conductor can also be stacked radially in the aforementioned second slot, and the stacked multiple coil wires can be fixed in a radially compressed state between the aforementioned protrusion of the aforementioned second slot and the bottom surface of the aforementioned second slot.

[0043] According to this structure, a force that compresses multiple coil wires radially is applied to the contact surface between the front end of the second linear portion of the first segment conductor and the front end of the first linear portion of the second segment conductor. Therefore, the front end of the second linear portion of the first segment conductor can be connected to the front end of the first linear portion of the second segment conductor more reliably.

[0044] [Example 1]

[0045] Figure 1 The stator 10 shown in Embodiment 1 is used in a motor. The stator 10 has a stator core 20 and a coil 40. The coil 40 is fixed to the stator core 20.

[0046] like Figure 2 As shown, the stator core 20 has a cylindrical shape with shaft Z1 as its central axis. The stator core 20 has end faces 21 and 22 on both sides along the direction of shaft Z1 (hereinafter referred to as the axial direction). A plurality of grooves 30 are provided on the inner circumferential surface 24 of the stator core 20. Each groove 30 is a recess provided on the inner circumferential surface 24. Each groove 30 extends axially from end face 21 to end face 22. Figure 3 As shown, in a cross-section perpendicular to the shaft Z1, each groove 30 extends radially along the stator core 20. In a cross-section perpendicular to the shaft Z1, each groove 30 has a bottom surface 32 and two side surfaces 34. On each side surface 34, a protrusion 36 is provided at the end of the inner circumferential side of the groove 30.

[0047] like Figure 1 As shown, the coil 40 is fixed to the stator core 20 by passing through the slots 30 of the stator core 20. The coil 40 is composed of multiple coil wires 42. Figure 4 This indicates a coil wire gauge of 42. For example... Figure 4 As shown, the coil wire 42 has a wave pattern. More specifically, the coil wire 42 undulates axially while extending circumferentially. The coil wire 42 is connected by multiple...Figure 5 The segmented conductor 50 shown is constructed. The segmented conductor 50 has a U-shape. That is, the segmented conductor 50 has a linear portion 51, a linear portion 52, and a connecting portion 54. The linear portion 51 and the linear portion 52 extend in a generally straight line. The connecting portion 54 connects the linear portion 51 and the linear portion 52. The linear portion 51 and the linear portion 52 extend in such a way that the distance between the linear portion 51 and the linear portion 52 narrows as they approach the front end portion 51a of the linear portion 51 and the front end portion 52a of the linear portion 52. A recess 51b is formed on the front end portion 51a of the linear portion 51. The recess 51b is formed on the inner side of the linear portion 51 (the side closer to the linear portion 52). A recess 52b is formed on the front end portion 52a of the linear portion 52. The recess 52b is formed on the inner side of the linear portion 52 (the side closer to the linear portion 51). Although not shown in the diagram, the surface of the segmented conductor 50, except for the recesses 51b and 52b, is covered by an insulating film. (As shown...) Figure 5 As shown by the dashed line, by applying force to the segmented conductor 50 from the outside, the connecting portion 54 can be elastically deformed, thereby widening the gap between the front end portion 51a and the front end portion 52a. By elastically deforming the connecting portion 54 in this way, the linear portion 51 and the linear portion 52 can be made approximately parallel. Figure 4 As shown, a waveform coil wire 42 is formed by connecting multiple segmented conductors 50 in a U-shape to each other.

[0048] Figure 6 This is a top view of a coil wire 42a fixed to the stator core 20, viewed from the center side of the stator core 20. Figure 6 The left and right directions are the circumferential directions of the stator core 20. Figure 6 The vertical direction is the axial direction of the stator core 20. For example... Figure 6 As shown, coil wire 42a is inserted through slots 30a, 30b, 30c, and 30d of a plurality of slots 30. Slots 30a, 30b, 30c, and 30d are arranged in this order, spaced apart circumferentially on the stator core 20. Between slots 30a and 30b, there are a plurality of other slots 30. Between slots 30b and 30c, there are a plurality of other slots 30. Between slots 30c and 30d, there are a plurality of other slots 30. As described above, coil wire 42a is composed of a plurality of segmented conductors 50. Figure 6 Within the shown area, the coil wire 42a has segmented conductors 50a, 50b, and 50c. Segmented conductor 50a is inserted into slots 30a and 30b from the end face 21 side. That is, the connecting portion 54 of the segmented conductor 50a is positioned facing the end face 21. The linear portion 51 of the segmented conductor 50a is inserted into slot 30a from the end face 21 side. The linear portion 52 of the segmented conductor 50a is inserted into slot 30b from the end face 21 side. The segmented conductor 50a is elastically deformed in such a way that the linear portions 51 and 52 are substantially parallel (i.e.,Figure 5 the state of being installed in the stator core 20), the reaction force Fa generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow. The segment conductor 50b is inserted into the slot 30b and the slot 30c from the end face 22 side. That is, the linking portion 54 of the segment conductor 50b is disposed at a position facing the end face 22. The linear portion 51 of the segment conductor 50b is inserted into the slot 30b from the end face 22 side. The linear portion 52 of the segment conductor 50b is inserted into the slot 30c from the end face 22 side. The segment conductor 50b is in a state of being elastically deformed in such a manner that the linear portion 51 and the linear portion 52 become substantially parallel (i.e., the state shown by the dashed-dotted line), and is inserted into the slots 30b and 30c. Thus, in the segment conductor 50b in the state of being installed in the stator core 20, the reaction force Fb generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow. Figure 5 the state of being installed in the stator core 20), the reaction force Fa generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow. The segment conductor 50b is inserted into the slot 30b and the slot 30c from the end face 22 side. That is, the linking portion 54 of the segment conductor 50b is disposed at a position facing the end face 22. The linear portion 51 of the segment conductor 50b is inserted into the slot 30b from the end face 22 side. The linear portion 52 of the segment conductor 50b is inserted into the slot 30c from the end face 22 side. The segment conductor 50b is in a state of being elastically deformed in such a manner that the linear portion 51 and the linear portion 52 become substantially parallel (i.e., the state shown by the dashed-dotted line), and is inserted into the slots 30b and 30c. Thus, in the segment conductor 50b in the state of being installed in the stator core 20, the reaction force Fb generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow. Figure 5 the state of being installed in the stator core 20), the reaction force Fa generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow. The segment conductor 50b is inserted into the slot 30b and the slot 30c from the end face 22 side. That is, the linking portion 54 of the segment conductor 50b is disposed at a position facing the end face 22. The linear portion 51 of the segment conductor 50b is inserted into the slot 30b from the end face 22 side. The linear portion 52 of the segment conductor 50b is inserted into the slot 30c from the end face 22 side. The segment conductor 50b is in a state of being elastically deformed in such a manner that the linear portion 51 and the linear portion 52 become substantially parallel (i.e., the state shown by the dashed-dotted line), and is inserted into the slots 30b and 30c. Thus, in the segment conductor 50b in the state of being installed in the stator core 20, the reaction force Fb generated at the linking portion 54 acts in a direction in which the interval between the linear portion 51 and the linear portion 52 becomes narrow.

[0049] In the slot 30b, the front end portion 52a of the linear portion 52 of the segment conductor 50a and the front end portion 51a of the linear portion 51 of the segment conductor 50b overlap in the circumferential direction of the stator core 20. The front end portion 52a of the segment conductor 50a is disposed at a position closer to the slot 30c than the front end portion 51a of the segment conductor 50b. A recess 52b is provided on the side of the slot 30a of the front end portion 52a of the segment conductor 50a, and a recess 51b is provided on the side of the slot 30c of the front end portion 51a of the segment conductor 50b, so that the recess 52b of the segment conductor 50a and the recess 51b of the segment conductor 50b come into contact with each other. A reaction force Fa acts on the front end portion 52a of the segment conductor 50a toward the front end portion 51a of the segment conductor 50b, and a reaction force Fb acts on the front end portion 51a of the segment conductor 50b toward the front end portion 52a of the segment conductor 50a. The reaction forces Fa and Fb are applied to the contact interface 58a of the front end portion 52a of the segment conductor 50a and the front end portion 51a of the segment conductor 50b, thereby fixing the segment conductor 50a and the segment conductor 50b to each other. Further, a pressure is applied to the contact interface 58a by the reaction forces Fa and Fb, thereby electrically connecting the segment conductor 50a and the segment conductor 50b at the contact interface 58a.

[0050] In the slot 30c, the front end portion 52a of the linear portion 52 of the segment conductor 50b and the front end portion 51a of the linear portion 51 of the segment conductor 50c overlap in the circumferential direction of the stator core 20. The front end portion 52a of the segment conductor 50b is disposed at a position closer to the slot 30d than the front end portion 51a of the segment conductor 50c. A recess 52b is provided on the side of the slot 30b of the front end portion 52a of the segment conductor 50b, and a recess 51b is provided on the side of the slot 30d of the front end portion 51a of the segment conductor 50c, so that the recess 52b of the segment conductor 50b and the recess 51b of the segment conductor 50c come into contact with each other. A reaction force Fb acts on the front end portion 52a of the segment conductor 50b toward the front end portion 51a of the segment conductor 50c, and a reaction force Fc acts on the front end portion 51a of the segment conductor 50c toward the front end portion 52a of the segment conductor 50b. The reaction forces Fb and Fc are applied to the contact interface 58b of the front end portion 52a of the segment conductor 50b and the front end portion 51a of the segment conductor 50c, thereby fixing the segment conductor 50b and the segment conductor 50c to each other. Further, a pressure is applied to the contact interface 58b by the reaction forces Fb and Fc, thereby electrically connecting the segment conductor 50b and the segment conductor 50c at the contact interface 58b.

[0051] In this way, the segment conductors 50a, 50b, 50c are connected to each other by the reaction forces Fa, Fb, Fc. Therefore, no bonding material is provided on the contact interface 58a of the segment conductor 50a and the segment conductor 50b and the contact interface 58b of the segment conductor 50b and the segment conductor 50c. That is, the contact interfaces 58a, 58b are physically and electrically connected without a bonding material. By the same structure, all of the segment conductors 50 constituting the coil wire 42a are connected to each other. Further, the other coil wires 42 are also constituted in the same manner as the coil wire 42a. As shown in FIG. 6, a plurality of coil wires 42 are inserted into one slot 30. In one slot 30, the plurality of coil wires 42 are stacked in the radial direction of the stator core 20. Figure 7

[0052] Next, a manufacturing method of the stator 10 will be described. The manufacturing method of the stator 10 has a process of fixing the coil 40 to the stator core 20. In this process, the coil wire 42 is formed by mounting each segment conductor 50 on the stator core 20 in a state where the segment conductor 50 is elastically deformed. By forming a plurality of coil wires 42, the coil 40 is formed. Hereinafter, the mounting process of the segment conductor 50 will be described in detail.

[0053] In the process of mounting the segment conductor 50a on the stator core 20, as shown in FIG. 5, the linear portions 51, 52 are inserted into the slots 30a, 30b from the end face 21 side. Here, as shown by the dotted line in FIG. 5, the linear portions 51, 52 are inserted into the slots 30a, 30b in a state where the linking portion 54 is elastically deformed. Figure 6 Figure 5 In the process of mounting the segment conductor 50b on the stator core 20, as shown in FIG. 6, the linear portions 51, 52 are inserted into the slots 30b, 30c from the end face 22 side. Here, as shown by the dotted line in FIG. 6, the linear portions 51, 52 are inserted into the slots 30b, 30c in a state where the linking portion 54 is elastically deformed. Here, in the slot 30b, the leading end portion 51a of the segment conductor 50b is located more to the slot 30a side than the leading end portion 52a of the segment conductor 50a. Figure 6 Figure 5 In the process of mounting the segment conductor 50c on the stator core 20, as shown in FIG. 7, the linear portions 51, 52 are inserted into the slots 30c, 30d from the end face 21 side. Here, as shown by the dotted line in FIG. 7, the linear portions 51, 52 are inserted into the slots 30c, 30d in a state where the linking portion 54 is elastically deformed. Here, in the slot 30c, the leading end portion 51a of the segment conductor 50c is located more to the slot 30b side than the leading end portion 52a of the segment conductor 50b. Figure 6 Figure 5

[0054] ​​​​​In this way, the plurality of segment conductors 50 (i.e., the plurality of segment conductors 50 constituting the coil wire 42a) including the segment conductors 50a, 50b, 50c are inserted into the corresponding slots 30. Then, the external force elastically deforming each segment conductor 50 is released. In this way, each segment conductor 50 is deformed in a manner that the reaction force is released, and the contact interface of each segment conductor 50 with each other is pressed. As a result, each segment conductor 50 is electrically and physically connected with each other. For example, the segment conductor 50a and the segment conductor 50b are physically and electrically connected at the contact interface 58a by the reaction force Fa, Fb pressing the contact interface 58a. Further, the segment conductor 50b and the segment conductor 50c are physically and electrically connected at the contact interface 58b by the reaction force Fb, Fc pressing the contact interface 58b. By connecting each segment conductor 50 in this way, the coil wire 42a is formed, and the coil wire 42a is fixed to the stator core 20. Likewise, by fixing each coil wire 42 to the stator core 20, the coil 40 is formed, and the coil 40 is fixed to the stator core 20.

[0055] In this way, in the manufacturing method, each segment conductor 50 is inserted into each slot 30 in an elastically deformed state, and then each segment conductor 50 is connected with each other by releasing the reaction force of each segment conductor 50. Therefore, each segment conductor 50 can be easily connected, and the coil 40 can be easily fixed to the stator core 20. Further, each segment conductor 50 does not need to be pressed by a jig in each slot 30, and therefore a pressing jig is not needed. Therefore, in the case of manufacturing a plurality of stators having different shapes of the stator core 20, it is not necessary to change the pressing jig, and a plurality of stators can be efficiently manufactured. Further, in the manufacturing method, each segment conductor 50 is connected with each other by the reaction force, and therefore a bonding material is not needed on the contact interface of each segment conductor 50. Therefore, the stator 10 can be more efficiently manufactured. Further, by connecting each segment conductor 50 in each slot 30 in this way, the connection portion of each segment conductor outside the slot 30 can be eliminated. Thus, the coil 40 can be downsized and lightened, and the copper loss generated in the coil 40 can be reduced. Further, in other embodiments, a bonding material can be provided on the contact interface of each segment conductor.

[0056] [Embodiment 2]

[0057] Regarding the stator of Embodiment 2, the shape of the contact interface 58 of each segment conductor 50 is different from that of the stator of Embodiment 1. As Figure 8In Embodiment Two, the contact interfaces 58 of the front end portions 51a and 52a are inclined with respect to the radial direction of the stator core 20. In addition, in Embodiment Two, the plurality of coil wires 42 are fixed in a state of being compressed in the radial direction between the bottom surface 32 of the slot 30 and the convex portion 36. That is, in the manufacturing process of the stator, when the last segment conductor 50 is inserted into the slot 30, the last segment conductor 50 is pressed into the slot 30. Thus, as indicated by the arrow, a compressive force Fr is applied to each of the coil wires 42 in the radial direction of the stator core 20. Each of the contact interfaces 58 is inclined with respect to the radial direction, and thus the compressive force Fr applied to each of the coil wires 42 is applied to each of the contact interfaces 58. In this way, in Embodiment Two, a higher pressure is applied to each of the contact interfaces 58, and thus the segment conductors 50 can be more firmly connected to each other and can be electrically connected to each other with a lower contact resistance. In addition, as Figure 9 As indicated by the dotted line, a pressure can be applied to each of the coil wires 42 in the radial direction by pressing the member 60 other than the segment conductors 50 into the slot 30.

[0058] [Embodiment Three]

[0059] In the stator of Embodiment Three, the shape of each of the segment conductors 50 is different from that of Embodiment One. The other structures of the stator of Embodiment Three are the same as those of the stator 10 of Embodiment One.

[0060] Figure 10 A segment conductor 50 of Embodiment Three is indicated. In the segment conductor 50 of Embodiment Three, the linear portion 51 and the linear portion 52 extend in a manner that the interval between the linear portion 51 and the linear portion 52 becomes wider as a position closer to the front end portion 51a and the front end portion 52a. In addition, in the segment conductor 50 of Embodiment Three, a recessed portion 51b is formed in the side surface of the linear portion 51 on the outer side (the side away from the linear portion 52). In addition, in the segment conductor 50 of Embodiment Three, a recessed portion 52b is formed in the side surface of the linear portion 52 on the outer side (the side away from the linear portion 51). As Figure 10 As indicated by the dotted line, by applying a force to the segment conductor 50 from the outside, the linking portion 54 can be elastically deformed to thereby narrow the interval between the front end portion 51a and the front end portion 52a. By elastically deforming the linking portion 54 in this way, the linear portion 51 and the linear portion 52 can be made substantially parallel. The other structures of the segment conductor 50 of Embodiment Three are the same as those of the segment conductor 50 of Embodiment One.

[0061] Figure 11 An installation structure of each of the segment conductors 50 with respect to the stator core 20 in the stator of Embodiment Three is indicated. As Figure 11As shown, in Embodiment 3, similarly to Embodiment 1, segmented conductor 50a is inserted into slots 30a and 30b from the end face 21 side, segmented conductor 50b is inserted into slots 30b and 30c from the end face 21 side, and segmented conductor 50c is inserted into slots 30c and 30d from the end face 21 side. Segmented conductor 50a undergoes elastic deformation in a manner where the linear portion 51 and the linear portion 52 are substantially parallel (i.e., Figure 10 (As shown by the dashed lines) the section conductor 50a is inserted into slots 30a and 30b. Therefore, in the segmented conductor 50a installed in the stator core 20, the reaction force Fa generated at the connecting portion 54 acts in the direction of widening the gap between the linear portions 51 and 52. The segmented conductor 50b undergoes elastic deformation in a state where the linear portions 51 and 52 are approximately parallel (i.e., Figure 10 (As shown by the dashed lines) the section conductor 50b is inserted into slots 30b and 30c. Therefore, in the segmented conductor 50b mounted on the stator core 20, the reaction force Fb generated on the connecting portion 54 acts in the direction of widening the gap between the linear portions 51 and 52. The segmented conductor 50c undergoes elastic deformation in a manner where the linear portions 51 and 52 are approximately parallel (i.e., Figure 10 (As shown by the dashed line) it is inserted into slots 30c and 30d. Therefore, in the segmented conductor 50c installed in the stator core 20, the reaction force Fc generated in the connecting part 54 acts in the direction of expanding the interval between the linear part 51 and the linear part 52.

[0062] Within slot 30b, the front end portion 52a of the linear portion 52 of segmented conductor 50a overlaps with the front end portion 51a of the linear portion 51 of segmented conductor 50b in the circumferential direction of stator core 20. The front end portion 52a of segmented conductor 50a is positioned closer to slot 30a than the front end portion 51a of segmented conductor 50b. A recess 52b is provided on the side of the front end portion 52a of segmented conductor 50a on the slot 30c side, and a recess 51b is provided on the side of the front end portion 51a of segmented conductor 50b on the slot 30a side, so that the recesses 52b and 51b of segmented conductor 50a are in contact with each other. A reaction force Fa acts on the front end portion 52a of segmented conductor 50a toward the front end portion 51a of segmented conductor 50b, and a reaction force Fb acts on the front end portion 51a of segmented conductor 50b toward the front end portion 52a of segmented conductor 50a. The reaction forces Fa and Fb are applied to the contact interface 58a between the segment conductor 50a and the front end 52a and the front end 51a of the segment conductor 50b, thereby fixing the segment conductor 50a and segment conductor 50b together. Furthermore, the reaction forces Fa and Fb apply pressure to the contact interface 58a, thereby electrically connecting the segment conductor 50a and segment conductor 50b at the contact interface 58a.

[0063] Within slot 30c, the front end portion 52a of the linear portion 52 of segmented conductor 50b overlaps with the front end portion 51a of the linear portion 51 of segmented conductor 50c in the circumferential direction of stator core 20. The front end portion 52a of segmented conductor 50b is positioned closer to slot 30b than the front end portion 51a of segmented conductor 50c. A recess 52b is provided on the side of the front end portion 52a of segmented conductor 50b on the slot 30d side, and a recess 51b is provided on the side of the front end portion 51a of segmented conductor 50c on the slot 30b side, so that the recesses 52b and 51b of segmented conductor 50b are in contact with each other. A reaction force Fb acts on the front end portion 52a of segmented conductor 50b toward the front end portion 51a of segmented conductor 50c, and a reaction force Fc acts on the front end portion 51a of segmented conductor 50c toward the front end portion 52a of segmented conductor 50b. By applying reaction forces Fb and Fc to the contact interface 58b between the front end 52a of segmented conductor 50b and the front end 51a of segmented conductor 50c, segmented conductor 50b and segmented conductor 50c are fixed together. Furthermore, by applying pressure to the contact interface 58b through the reaction forces Fb and Fc, segmented conductor 50b and segmented conductor 50c are electrically connected within the contact interface 58b.

[0064] In this manner, in Embodiment 3, the segmented conductors 50a, 50b, and 50c are also interconnected by reaction forces Fa, Fb, and Fc. Therefore, no bonding material is provided at the contact interface 58a between segmented conductors 50a and 50b, or at the contact interface 58b between segmented conductors 50b and 50c. That is, the contact interfaces 58a and 58b are physically and electrically connected without any bonding material.

[0065] Next, the installation process of the segmented conductor 50 in Example 3 will be described.

[0066] In the process of mounting the segmented conductor 50a onto the stator core 20, such as Figure 10 As shown by the dashed lines, with the connecting portion 54 in a state of elastic deformation, the linear portions 51 and 52 are inserted into the slots 30a and 30b from the end face 21 side. In the process of mounting the segmented conductor 50b onto the stator core 20, as... Figure 10 As shown by the dashed lines, with the connecting portion 54 in a state of elastic deformation, the linear portions 51 and 52 are inserted into the slots 30b and 30c from the end face 22 side. Here, within the slot 30b, the front end 51a of the segmented conductor 50b is positioned closer to the slot 30c side than the front end 52a of the segmented conductor 50a. In the process of mounting the segmented conductor 50c onto the stator core 20, as... Figure 10In the state where the connecting portion 54 is elastically deformed, the linear portions 51, 52 are inserted into the grooves 30c, 30d from the end surface 21 side as indicated by the dotted line. At this time, in the groove 30c, the leading end portion 51a of the segment conductor 50c is located on the groove 30d side more than the leading end portion 52a of the segment conductor 50b.

[0067] In this way, the plurality of segment conductors 50 (i.e., the plurality of segment conductors 50 constituting the coil wire 42a) including the segment conductors 50a, 50b, 50c are inserted into the corresponding grooves 30. Next, the external force elastically deforming each segment conductor 50 is released. In this way, each segment conductor 50 is deformed in a manner that the reaction force is released, and the contact interfaces of each segment conductor 50 are pressed against each other. As a result, each segment conductor 50 is electrically and physically connected to each other. For example, the segment conductor 50a and the segment conductor 50b are physically and electrically connected at the contact interface 58a by the reaction force Fa, Fb pressing the contact interface 58a. Further, the segment conductor 50b and the segment conductor 50c are physically and electrically connected at the contact interface 58b by the reaction force Fb, Fc pressing the contact interface 58b. By connecting each segment conductor 50 in this way, the coil wire 42a is formed, and the coil wire 42a is fixed to the stator core 20. Likewise, by fixing each coil wire 42 to the stator core 20, the coil 40 is formed, and the coil 40 is fixed to the stator core 20.

[0068] In this way, in the manufacturing method of Embodiment Three, each segment conductor 50 can be easily connected, and the coil 40 can be easily fixed to the stator core 20. Further, in other embodiments, a bonding material can be provided on the contact interface of each segment conductor.

[0069] Further, in Embodiment Three, as in Embodiment Two (i.e., Figure 8 , 9 ) Likewise, each contact interface 58 can be inclined with respect to the radial direction of the stator core 20. In this case, the coil wire 42 or other member 60 can be inserted into the groove 30 to press each coil wire 42 in the groove 30 in the radial direction of the stator core 20. By deforming Embodiment Three in this way, a high pressure is applied to each contact interface 58. Therefore, each segment conductor 50 can be more firmly connected to each other, and each segment conductor 50 can be more firmly electrically connected to each other with a lower contact resistance.

[0070] Further, in Embodiments One to Three described above, the contact interface 58 is flat, but the contact interface 58 can have a concavo-convex. That is, the contact interface 58 can be constituted by engaging surfaces having a concavo-convex with each other.

[0071] Furthermore, in the above embodiments one to three, coils 30 are inserted in slots 30a, 30b, 30c, and 30d that are arranged at intervals, but coils 30 can also be inserted in adjacent slots 30.

[0072] End face 21 in Embodiments 1 to 3 is an example of a first end face. End face 22 in Embodiments 1 to 3 is an example of a second end face. Groove 30a in Embodiments 1 to 3 is an example of a first groove. Groove 30b in Embodiments 1 to 3 is an example of a second groove. Groove 30c in Embodiments 1 to 3 is an example of a third groove. Groove 30d in Embodiments 1 to 3 is an example of a fourth groove. Segmented conductor 50a in Embodiments 1 to 3 is an example of a first segmented conductor. Segmented conductor 50b in Embodiments 1 to 3 is an example of a second segmented conductor. Segmented conductor 50c in Embodiments 1 to 3 is an example of a third segmented conductor. Linear portion 51 in Embodiments 1 to 3 is an example of a first linear portion. Linear portion 52 in Embodiments 1 to 3 is an example of a second linear portion.

[0073] Furthermore, in embodiments one to three described above, coil 40 is a waveform coil. However, coil 40 can also be an overlapping wound type. Figure 12 , 13 This indicates coil 40b, which is an overlapping wound type. Coil 40b is wound by repeatedly inserting through slots 30e and 30f. For example... Figure 14 As shown, in coil 40b, the segmented conductor 50a inserted from end face 20a and... Figure 10 Similarly, the segmented conductor 50, which exerts a reaction force outward, is inserted from end face 20b and... Figure 5 Similarly, segmented conductors 50 exert inward reaction forces. The linear portions 51 of segmented conductors 50a and 50b are inserted into groove 30e, and the linear portions 52 of segmented conductors 50a and 50b are inserted into groove 30f. For example... Figure 12 As shown, the two ends of each segmented conductor 50 are connected to different segmented conductors 50, thereby forming a spirally extending coil 40b. In this structure, the segmented conductors 50a and 50b are interconnected by the reaction force of the segmented conductors 50a and 50b. In this structure, slot 30e is an example of the first and third slots. That is, in this structure, the first and third slots are formed by a common slot 30e. Furthermore, in this structure, slot 30f is an example of the second and fourth slots. That is, in this structure, the second and fourth slots are formed by a common slot 30f.

[0074] The above describes embodiments in detail, but these are merely examples and do not limit the scope of the claims. In the technology recited in the claims, various modifications, changes of the technology directed to the above-described specific examples are included. The technical elements described in the specification or drawings are elements that exhibit technical utility by themselves or in various combinations, and are not limited to the combinations recited in the claims at the time of filing. Furthermore, the technology exemplified in the specification or drawings is technology that achieves multiple objects at the same time, and achieving one of the objects itself has technical utility.

Claims

1. A stator, comprising: a stator core having a cylindrical shape; and a coil fixed to the stator core, the stator core has a first end surface and a second end surface disposed on both sides in an axial direction of the stator core, a first slot, a second slot, a third slot, and a fourth slot are provided on an inner peripheral surface of the stator core, the first slot, the second slot, the third slot, and the fourth slot each extend from the first end surface to the second end surface along the axial direction, the coil has a first segment conductor, a second segment conductor, and a third segment conductor, the first segment conductor, the second segment conductor, and the third segment conductor each have a U-shaped form having a first linear portion, a second linear portion, and a connecting portion that connects the first linear portion and the second linear portion, the connecting portion of the first segment conductor is disposed at a position facing the first end surface, the first linear portion of the first segment conductor is inserted into the first slot, the second linear portion of the first segment conductor is inserted into the second slot, the connecting portion of the second segment conductor is disposed at a position facing the second end surface, the first linear portion of the second segment conductor is inserted into the second slot, the second linear portion of the second segment conductor is inserted into the third slot, the connecting portion of the third segment conductor is disposed at a position facing the first end surface, the first linear portion of the third segment conductor is inserted into the third slot, the second linear portion of the third segment conductor is inserted into the fourth slot, a leading end portion of the second linear portion of the first segment conductor and a leading end portion of the first linear portion of the second segment conductor are electrically connected to each other in the second slot in a state of overlapping in a circumferential direction of the stator core, a leading end portion of the second linear portion of the second segment conductor and a leading end portion of the first linear portion of the third segment conductor are electrically connected to each other in the third slot in a state of overlapping in the circumferential direction of the stator core, in a cross section orthogonal to the axial direction, a contact surface of the leading end portion of the second linear portion of the first segment conductor and the leading end portion of the first linear portion of the second segment conductor is inclined with respect to a radial direction of the stator core, a protrusion is provided on a side surface of the second slot, a plurality of coil wires including coil wires formed by the first segment conductor and the second segment conductor are stacked in the radial direction in the second slot, the plurality of coil wires are fixed in a state of being compressed in the radial direction between the protrusion of the second slot and a bottom surface of the second slot.

2. The stator of claim 1, wherein the first slot, the second slot, the third slot, and the fourth slot are provided on the inner peripheral surface of the stator core at intervals in the circumferential direction of the stator core in this order.

3. The stator of claim 2, wherein in the second slot, the leading end portion of the second linear portion of the first segment conductor is disposed closer to a side of the third slot than the leading end portion of the first linear portion of the second segment conductor, the first linear portion of the third segment conductor is disposed closer to the second slot side than the front end portion of the second linear portion of the second segment conductor, the first segment conductor is fixed to the stator core in a state where the linking portion of the first segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the first segment conductor and the second linear portion of the first segment conductor is reduced, the second segment conductor is fixed to the stator core in a state where the linking portion of the second segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the second segment conductor and the second linear portion of the second segment conductor is reduced, the third segment conductor is fixed to the stator core in a state where the linking portion of the third segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the third segment conductor and the second linear portion of the third segment conductor is reduced.

4. A stator according to claim 3, characterised in that a recess is formed in the first slot side of the front end portion of the second linear portion of the first segment conductor, a recess is formed in the third slot side of the front end portion of the first linear portion of the second segment conductor, the recess of the second linear portion of the first segment conductor contacts the recess of the first linear portion of the second segment conductor in the second slot, a recess is formed in the second slot side of the front end portion of the second linear portion of the second segment conductor, a recess is formed in the fourth slot side of the front end portion of the first linear portion of the third segment conductor, the recess of the second linear portion of the second segment conductor contacts the recess of the first linear portion of the third segment conductor in the third slot.

5. The stator of claim 2, wherein the front end portion of the second linear portion of the first segment conductor is disposed closer to the first slot side than the front end portion of the first linear portion of the second segment conductor in the second slot, the front end portion of the first linear portion of the third segment conductor is disposed closer to the fourth slot side than the front end portion of the second linear portion of the second segment conductor in the third slot, the first segment conductor is fixed to the stator core in a state where the linking portion of the first segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the first segment conductor and the second linear portion of the first segment conductor is reduced, the second segment conductor is fixed to the stator core in a state where the linking portion of the second segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the second segment conductor and the second linear portion of the second segment conductor is reduced, The third segment conductor is fixed to the stator core in a state in which the connecting portion of the third segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the third segment conductor and the second linear portion of the third segment conductor is reduced.

6. The stator of claim 5, wherein A recess is formed in a side surface of the third slot side of the front end portion of the second linear portion of the first segment conductor, A recess is formed in a side surface of the first slot side of the front end portion of the first linear portion of the second segment conductor, The recess of the second linear portion of the first segment conductor and the recess of the first linear portion of the second segment conductor are in contact with each other in the second slot, A recess is formed in a side surface of the fourth slot side of the front end portion of the second linear portion of the second segment conductor, A recess is formed in a side surface of the second slot side of the front end portion of the first linear portion of the third segment conductor, The recess of the second linear portion of the second segment conductor and the recess of the first linear portion of the third segment conductor are in contact with each other in the third slot.

7. A manufacturing method of a stator, comprising: a process of fixing a coil to a stator core having a cylindrical shape, the stator core has a first end surface and a second end surface disposed on both sides in an axial direction of the stator core, a first slot, a second slot, a third slot, and a fourth slot are provided on an inner peripheral surface of the stator core, the first slot, the second slot, the third slot, and the fourth slot each extend from the first end surface to the second end surface along the axial direction, the coil has a first segment conductor, a second segment conductor, and a third segment conductor, the first segment conductor, the second segment conductor, and the third segment conductor each have a U shape having a first linear portion, a second linear portion, and a connecting portion that connects the first linear portion and the second linear portion, the process of fixing the coil to the stator core includes: a process of installing the first segment conductor to the stator core in such a manner that the connecting portion of the first segment conductor is disposed at a position facing the first end surface, the first linear portion of the first segment conductor is inserted into the first slot, and the second linear portion of the first segment conductor is inserted into the second slot; a process of installing the second segment conductor to the stator core in such a manner that the connecting portion of the second segment conductor is disposed at a position facing the second end surface, the first linear portion of the second segment conductor is inserted into the second slot, and the second linear portion of the second segment conductor is inserted into the third slot; and a process of installing the third segment conductor to the stator core in such a manner that the connecting portion of the third segment conductor is disposed at a position facing the first end surface, the first linear portion of the third segment conductor is inserted into the third slot, and the second linear portion of the third segment conductor is inserted into the fourth slot. The fixing of the coil to the stator core is performed in such a manner that the front end portion of the second linear portion of the first segment conductor and the front end portion of the first linear portion of the second segment conductor are electrically connected to each other in the second slot in a state of overlapping in the circumferential direction of the stator core, and the front end portion of the second linear portion of the second segment conductor and the front end portion of the first linear portion of the third segment conductor are electrically connected to each other in the third slot in a state of overlapping in the circumferential direction of the stator core, In a state where the first segment conductor and the second segment conductor are installed on the stator core, in a cross section orthogonal to the axial direction, a contact surface of the front end portion of the second linear portion of the first segment conductor and the front end portion of the first linear portion of the second segment conductor is inclined with respect to the radial direction of the stator core, A protrusion is provided on a side surface of the second slot, In the fixing of the coil to the stator core, a plurality of coil wires including coil wires configured by the first segment conductor and the second segment conductor are stacked in the radial direction in the second slot, and the plurality of stacked coil wires are fixed in a state of being compressed in the radial direction between the protrusion of the second slot and a bottom surface of the second slot.

8. The production method according to claim 7, wherein The first slot, the second slot, the third slot, and the fourth slot are provided on an inner circumferential surface of the stator core in this order at intervals in the circumferential direction of the stator core.

9. The production method according to claim 7, wherein The fixing of the coil to the stator core is performed in such a manner that, in the second slot, the front end portion of the second linear portion of the first segment conductor is disposed on a side closer to the third slot than the front end portion of the first linear portion of the second segment conductor, and in the third slot, the front end portion of the first linear portion of the third segment conductor is disposed on a side closer to the second slot than the front end portion of the second linear portion of the second segment conductor, In the fixing of the coil to the stator core, a plurality of coil wires including coil wires configured by the first segment conductor and the second segment conductor are stacked in the radial direction in the second slot, and the plurality of stacked coil wires are fixed in a state of being compressed in the radial direction between the protrusion of the second slot and a bottom surface of the second slot. In the fixing of the coil to the stator core, a plurality of coil wires including coil wires configured by the first segment conductor and the second segment conductor are stacked in the radial direction in the second slot, and the plurality of stacked coil wires are fixed in a state of being compressed in the radial direction between the protrusion of the second slot and a bottom surface of the second slot. In the fixing of the coil to the stator core, a plurality of coil wires including coil wires configured by the first segment conductor and the second segment conductor are stacked in the radial direction in the second slot, and the plurality of stacked coil wires are fixed in a state of being compressed in the radial direction between the protrusion of the second slot and a bottom surface of the second slot.

10. The manufacturing method according to claim 8, wherein a recess is formed in the inner side surface of the front end portion of the second linear portion of the first segment conductor, a recess is formed in the inner side surface of the front end portion of the first linear portion of the second segment conductor, a recess is formed in the inner side surface of the front end portion of the second linear portion of the second segment conductor, a recess is formed in the inner side surface of the front end portion of the first linear portion of the third segment conductor, the process of fixing the coil to the stator core is performed in such a manner that the recess of the second linear portion of the first segment conductor contacts the recess of the first linear portion of the second segment conductor in the second slot, and the recess of the second linear portion of the second segment conductor contacts the recess of the first linear portion of the third segment conductor in the third slot.

11. The production method according to claim 7, wherein the process of fixing the coil to the stator core is performed in such a manner that the front end portion of the second linear portion of the first segment conductor is disposed on the side closer to the first slot than the front end portion of the first linear portion of the second segment conductor in the second slot, and the front end portion of the first linear portion of the third segment conductor is disposed on the side closer to the fourth slot than the front end portion of the second linear portion of the second segment conductor in the third slot, in the process of mounting the first segment conductor to the stator core, the first segment conductor is mounted to the stator core in a state where the link portion of the first segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the first segment conductor and the second linear portion of the first segment conductor is reduced, in the process of mounting the second segment conductor to the stator core, the second segment conductor is mounted to the stator core in a state where the link portion of the second segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the second segment conductor and the second linear portion of the second segment conductor is reduced, in the process of mounting the third segment conductor to the stator core, the third segment conductor is mounted to the stator core in a state where the link portion of the third segment conductor is elastically deformed in a direction in which the interval between the first linear portion of the third segment conductor and the second linear portion of the third segment conductor is reduced.

12. The manufacturing method according to claim 10, wherein a recess is formed in the outer side surface of the front end portion of the second linear portion of the first segment conductor, a recess is formed in the outer side surface of the front end portion of the first linear portion of the second segment conductor, a recess is formed in the outer side surface of the front end portion of the second linear portion of the second segment conductor, a recess is formed in the outer side surface of the front end portion of the first linear portion of the third segment conductor, The fixing process of the coil to the stator core is performed in such a manner that the recess of the second linear portion of the first segment conductor contacts the recess of the first linear portion of the second segment conductor in the second slot, and the recess of the second linear portion of the second segment conductor contacts the recess of the first linear portion of the third segment conductor in the third slot.

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