Stator manufacturing method

Abstract

To provide a manufacturing method of a stator capable of relatively thickening an anodized film formed on a coil wire while preventing cracks from occurring in the anodized film.SOLUTION: In a manufacturing method of a stator 100, after a coil bending step (S112) of bending a coil wire 31, which is not coated with an insulating film and mainly composed of aluminum or an aluminum alloy, into a shape to be arranged on the stator 100, an anodizing step (S130) is performed to form an anodized film 32 by anodizing the coil wire 31.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a stator. [Background technology]

[0002] BACKGROUND ART Conventionally, it has been known to form an anodic oxide coating by anodizing a coil wire material containing aluminum or an aluminum alloy as a main component (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a method for forming an insulating coating on an aluminum wire, in which an anodized coating is formed on an aluminum wire (a coil wire whose main component is aluminum or an aluminum alloy) by anodizing, and then a resin insulating coating is formed by electrodeposition coating. In the method for forming an insulating coating on an aluminum wire described in the above-mentioned Patent Document 1, if the anodized coating is made thick, cracks are likely to occur in the anodized coating when the aluminum wire is bent in a subsequent process, making it difficult to make the anodized coating thick. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-121915 Summary of the Invention [Problem to be solved by the invention]

[0005] Unlike resin insulating coatings, aluminum-based anodic oxide coatings do not deteriorate even when partial discharge occurs. Furthermore, aluminum-based anodic oxide coatings have higher thermal conductivity than resin insulating coatings. Furthermore, as motor drive voltages have become higher in recent years, it has become necessary to improve the reliability of the coatings formed on coils against the high voltages encountered during motor operation and to effectively remove the heat generated in the coils during motor operation. This means that it has become necessary to make the anodic oxide coatings relatively thick.

[0006] However, in the method of forming an insulating coating on an aluminum wire rod described in Patent Document 1, as described above, cracks tend to occur in the anodized coating, making it difficult to thicken the anodized coating. Therefore, there is a need for a method of manufacturing a stator that can form a relatively thick anodized coating on a coil wire rod while preventing cracks from occurring in the anodized coating.

[0007] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a method for manufacturing a stator that can form a relatively thick anodic oxide coating on a coil wire while preventing cracks from occurring in the anodic oxide coating. [Means for solving the problem]

[0008] In order to achieve the above object, a method of manufacturing a stator according to one aspect of the present invention includes a method for disposing a coil wire material, which is not formed with an insulating coating and is mainly composed of aluminum or an aluminum alloy, in a stator. U-shaped shape To form a segment coil After the coil bending process, The tip of the slot-accommodating portion, which is the joint of the segment coil, is exposed from the anodizing treatment bath, and the segment coil is an anodizing treatment step of forming an anodized film on the surface by anodizing treatment; After the anodizing treatment process, an insulating coating formation process is performed in which an insulating coating mainly composed of resin is formed on the segment coil on which the anodized coating has been formed by electrodeposition coating, with the tip of the slot accommodating portion, which will be the joint of the segment coil on which the anodized coating has been formed, exposed from the treatment bath for electrodeposition coating; and After that, Segment coil and a coil placement step of placing the coil on the stator.

[0009] In one aspect of the present invention, the stator manufacturing method includes, after the coil bending step, an anodizing step in which an anodized oxide coating is formed on the coil wire by anodizing, as described above. This prevents cracks from occurring in the anodized oxide coating, unlike when the coil bending step is performed after the anodizing step, and allows the anodized oxide coating to be formed relatively thick in the anodizing step. As a result, the anodized oxide coating formed on the coil wire can be made relatively thick while preventing cracks from occurring in the anodized oxide coating. [Effects of the Invention]

[0010] According to the present invention, as described above, it is possible to provide a method for manufacturing a stator that can form a relatively thick anodic oxide coating on a coil wire while preventing cracks from occurring in the anodic oxide coating. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view showing an entire stator according to a first embodiment. [Figure 2] FIG. 2 is a perspective view for explaining the configuration of a stator according to the first embodiment. [Figure 3] FIG. 2 is a schematic diagram for explaining a coil portion in the stator according to the first embodiment. [Figure 4] 5A to 5C are diagrams showing a manufacturing flow of the stator according to the first embodiment. [Figure 5] 5A to 5C are diagrams for explaining a coil cutting step in the manufacturing flow of the stator according to the first embodiment. [Figure 6] 5A to 5C are diagrams for explaining a coil bending step in the manufacturing flow of the stator according to the first embodiment. [Figure 7] 5A to 5C are diagrams for explaining a degreasing step in the manufacturing flow of the stator according to the first embodiment. [Figure 8] 5A to 5C are diagrams illustrating an anodizing treatment step in the manufacturing flow of the stator according to the first embodiment. [Figure 9] 5A to 5C are diagrams for explaining an insulating coating forming step in the manufacturing flow of the stator according to the first embodiment. [Figure 10] 5A to 5C are diagrams for explaining a coil arrangement step in the manufacturing flow of the stator according to the first embodiment. [Figure 11] FIG. 10 is a schematic diagram for explaining a coil portion in a stator according to a second embodiment. [Figure 12] 10A to 10C are diagrams showing a manufacturing flow of the stator according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] [First embodiment] (Stator configuration) The configuration of a stator 100 according to a first embodiment of the present invention will be described with reference to FIGS.

[0014] In the following description, the axial, radial, and circumferential directions of the stator 100 are referred to as the Z direction, R direction, and C direction, respectively. One side and the other side in the Z direction are referred to as the Z1 side and the Z2 side, respectively. One side (radially inner side) and the other side (radially outer side) in the R direction are referred to as the R1 side and the R2 side, respectively.

[0015] 1, the stator 100 constitutes a part of an inner rotor type rotating electric machine (not shown) together with a rotor (not shown) arranged on the R1 side of the stator 100 so as to face the stator 100. The rotating electric machine is, for example, a motor, a generator, or a motor / generator.

[0016] The stator 100 includes a stator core 10 and a coil portion 20 .

[0017] <Configuration of stator core> Stator core 10 has a cylindrical shape with a central axis 90 along the Z direction. Stator core 10 is formed by stacking a plurality of electromagnetic steel plates (for example, silicon steel plates) in the Z direction.

[0018] 2, the stator core 10 includes an annular back yoke 11 and a plurality of teeth 12 protruding from the back yoke 11 toward the R1 side. A slot 13 is formed between each pair of adjacent teeth 12 in the C direction. That is, the stator core 10 includes a plurality of slots 13.

[0019] Each of the plurality of slots 13 is provided to extend in the Z direction. Each of the plurality of slots 13 is formed in the stator core 10 so that both sides in the Z direction are open. Each of the plurality of slots 13 is formed in the stator core 10 so that the R1 side is open.

[0020] <Coil configuration> As shown in Fig. 1, the coil section 20 is disposed relative to the stator core 10. Specifically, the coil section 20 is wound around the stator core 10 multiple times. The coil section 20 is a conductor mainly composed of aluminum or an aluminum alloy. The coil section 20 is configured to generate magnetic flux when supplied with three-phase AC power from a power supply (not shown).

[0021] As shown in Fig. 2, coil portion 20 includes a plurality of segment coils 21 and a plurality of bus members 22. Note that in Fig. 2, in order to illustrate teeth 12 and slots 13 described above, some of the plurality of bus members 22 or portions of bus members 22 are not shown.

[0022] 3, the segment coil 21 includes a pair of slot-accommodated portions 21a and a coil end portion 21b. The coil end portion 21b connects the pair of slot-accommodated portions 21a. The segment coil 21 is formed into a U-shape by the pair of slot-accommodated portions 21a and the coil end portion 21b.

[0023] The pair of slot-accommodated portions 21a are accommodated (inserted) in different slots 13. The coil end portions 21b are disposed on the Z2 side of the stator core 10. The tip portions 21c (on the Z1 side) of the slot-accommodated portions 21a are disposed so as to protrude from the end face of the stator core 10 on the Z1 side (protrude from the slots 13).

[0024] The segment coil 21 has an anodic oxide coating 32 (anodized aluminum) formed on a coil wire 31 whose main component is aluminum or an aluminum alloy. The anodic oxide coating 32 is an oxide coating formed by anodizing the coil wire 31. The segment coil 21 also has an insulating coating 33 formed on the anodic oxide coating 32. The insulating coating 33 is a coating whose main component is a resin such as PAI (Polyamide-imide) and is formed on the anodic oxide coating 32 by electrodeposition coating.

[0025] Bus members 22 are arranged on the Z1 side of stator core 10 along direction C (circumferential direction) so as to connect slot-received portions 21a received in different slots 13. The Z2-side ends of bus members 22 are connected to the (Z1-side) tip portions 21c of slot-received portions 21a by welding, solid-state welding, or the like. Bus members 22 are formed with coatings (anodic oxide coatings and insulating coatings) substantially similar to those of segment coils 21.

[0026] 3 shows a state in which the anodized coating 32 (anodized aluminum) and the insulating coating 33 are not formed (the coil wire 31 is exposed) on the tip portion 21c (on the Z1 side) of the slot-received portion 21a, because the tip portion 21c is to be connected to the Z2 side end of the bus member 22 by welding, solid-state welding, or the like. Although not shown, the tip portion 21c (where the coil wire 31 is exposed) of the slot-received portion 21a connected to the Z2 side end of the bus member 22 is insulated with a resin material such as varnish after the tip portion 21c of the slot-received portion 21a and the Z2 side end of the bus member 22 are connected.

[0027] (Method of manufacturing a stator) A method for manufacturing the stator 100 according to the first embodiment of the present invention will be described with reference to FIGS.

[0028] <Coil processing process> First, as shown in Fig. 4, a coil processing step is performed in step S110. The coil processing step (S110) is a step of processing a linear coil wire 31 that is not coated with an insulating film (is a bare conductor) and is mainly composed of aluminum or an aluminum alloy, for placement in the stator 100.

[0029] Specifically, the coil processing step (S110) includes a cutting step (S111) and a coil bending step (S112). As shown in Fig. 5, the cutting step (S111) is a step of cutting the straight coil wire 31 to a predetermined length (the length for forming the segment coil 21). As shown in Fig. 6, the coil bending step (S112) is a step of bending the straight coil wire 31 cut to the predetermined length in the cutting step (S111) into a shape for placement in the stator 100. That is, the coil bending step (S112) is a step of bending the coil wire 31 to form the U-shaped segment coil 21.

[0030] <Degreasing process> Next, a degreasing process is performed in step S120 as shown in Fig. 4. As shown in Fig. 7, the degreasing process (S120) is a process in which the U-shaped segment coil 21 is immersed in a cleaning bath 500 to clean (remove) dirt such as oil and grease from the surface of the U-shaped segment coil 21 (coil wire 31 on which no coating is formed).

[0031] <Anodizing process> Next, in step S130, an anodizing treatment process is performed as shown in Fig. 4. As shown in Fig. 8, the anodizing treatment process (S130) is a process of forming an anodic oxide coating 32 (anodized aluminum) on the coil wire 31 (mainly composed of aluminum or an aluminum alloy) by anodizing (anodizing). Specifically, the segment coil 21 is immersed in sulfuric acid, oxalic acid, or the like in a treatment bath 600 for anodizing, and electrolysis is performed using the coil wire 31, mainly composed of aluminum or an aluminum alloy, as an anode, thereby forming an aluminum oxide coating on the surface of the segment coil 21.

[0032] This prevents cracks from occurring in the anodic oxide coating 32, unlike when the coil bending step (S112) is performed after the anodizing treatment step (S130), and allows the anodic oxide coating 32 to be formed relatively thick in the anodizing treatment step (S130).As a result, the anodic oxide coating 32 formed on the coil wire 31 can be made relatively thick while preventing cracks from occurring in the anodic oxide coating 32.

[0033] The anodizing process (S130) is a process for forming an anodized coating 32 on the segment coil 21 by anodizing, with the tip 21c of the slot-accommodated portion 21a, which is the joint of the segment coil 21, exposed from the anodizing treatment bath 600. Specifically, the anodizing process is performed on the U-shaped segment coil 21, with the coil end portion 21b facing downward, and with all of the segment coil 21 except for the tip 21c of the slot-accommodated portion 21a (the end opposite to the coil end portion 21b) immersed in the anodizing treatment bath 600.

[0034] As a result, no anodic oxide coating 32 is formed on the tip end 21c of the slot-accommodated portion 21a, which serves as the joint portion of the segment coil 21 exposed from the anodizing treatment bath 600. Therefore, the tip end 21c of the slot-accommodated portion 21a of the segment coil 21 can be joined (connected) to each other in the bus member connecting step (S160) described below, without the need for a separate step of peeling off the anodic oxide coating 32 formed on the tip end 21c of the slot-accommodated portion 21a. This simplifies the manufacturing process.

[0035] The anodizing step (S130) is a step of forming an anodic oxide coating 32 having a thickness of more than 1 μm and not more than 20 μm on the coil wire 31 by anodizing. By forming the anodic oxide coating 32 to a thickness of more than 1 μm, it is possible to ensure the minimum thickness of the anodic oxide coating 32 (necessary for improving the reliability of the coating formed on the coil against the high voltage when the motor is driven and for effectively removing heat generated in the coil when the motor is driven). Furthermore, by forming the anodic oxide coating 32 to a thickness of 20 μm or less, it is possible to prevent the anodizing step (S130), which tends to require more time than the insulating coating forming step (S140) described below, from being excessively long.

[0036] <Insulating film formation> Next, as shown in Fig. 4, an insulating coating formation step is performed in step S140. As shown in Fig. 9, the insulating coating formation step (S140) is a step of forming an insulating coating 33 mainly composed of resin by electrodeposition coating on the coil wire 31 on which the anodic oxide coating 32 has been formed. Specifically, the segment coil 21 on which the anodic oxide coating 32 has been formed is immersed in an electrolyte solution mainly composed of a resin such as PAI in a treatment bath 700 for electrodeposition coating, and an electrolytic treatment is performed to apply (coat) the insulating coating 33 onto the anodic oxide coating 32. The insulating coating 33 applied onto the anodic oxide coating 32 is then heated, whereby the insulating coating 33 is hardened and formed.

[0037] As a result, in addition to the insulating anodic oxide coating 32, the insulating coating 33 is formed on the coil wire 31, which makes it easier to ensure the insulating performance of the coil wire 31 compared to when the coating formed on the coil wire 31 is only the anodic oxide coating 32. Furthermore, since the time required for the anodizing treatment step (S130) tends to be longer than the time required for the insulating coating formation step (S140), it is possible to effectively prevent the overall time required for the step of forming a coating on the coil wire 31 (and ultimately the overall time required for the manufacturing process of the stator 100) from being excessively long compared to when the coating formed on the coil wire 31 is composed only of the anodic oxide coating 32.

[0038] The insulating coating forming step (S140) is a step of forming an insulating coating 33 having a thickness of more than 20 μm and not more than 100 μm by electrodeposition coating on the coil wire 31 on which the anodic oxide coating 32 has been formed.

[0039] The insulating coating forming process (S140) is a process of forming an insulating coating 33 on the segment coil 21 by electro-deposition coating, with the tip 21c of the slot-accommodated portion 21a, which serves as the joint of the segment coil 21 on which the anodic oxide coating 32 is formed, exposed from the electro-deposition coating treatment bath 700. Specifically, the U-shaped segment coil 21 is anodized with the coil end portion 21b facing downwards, with all of the segment coil 21 except for the tip 21c of the slot-accommodated portion 21a (the end opposite to the coil end portion 21b) immersed in the electro-deposition coating treatment bath 700.

[0040] As a result, the insulating coating 33 is not formed on the tip end 21c of the slot-accommodated portion 21a, which is the joint portion of the segment coil 21 exposed from the electrodeposition coating treatment bath 700. Therefore, the tip end 21c of the slot-accommodated portion 21a of the segment coil 21 can be joined (connected) to each other in the bus member connecting step (S160) described below, without having to perform a separate step of peeling off the insulating coating 33 formed on the tip end 21c of the slot-accommodated portion 21a. This simplifies the manufacturing process.

[0041] <Coil placement process> Next, in step S150, a coil arrangement process is performed as shown in Fig. 4. As shown in Fig. 11, the coil arrangement process (S150) is a process of arranging the coil wire 31 in the stator 100. In detail, the coil arrangement process (S150) is a process of arranging the plurality of segment coils 21 in the stator 100 such that the slot-accommodated portions 21a, which are the joints of the plurality of segment coils 21, are accommodated in the slots 13 so that the tip portions 21c of the slot-accommodated portions 21a protrude from the slots 13 of the stator 100.

[0042] <Bus component connection process> Next, in step S160, a bus member connecting process is performed, as shown in Fig. 4. As shown in Fig. 3, the bus member connecting process (S160) is a process of connecting tip ends 21c of slot-accommodated portions 21a of multiple segment coils 21 to each other using bus members 22 arranged along the C direction (circumferential direction) of stator 100. Specifically, bus members 22 are arranged on the Z1 side of stator core 10 along the C direction (circumferential direction), and Z2-side tip ends of bus members 22 are brought into contact with tip ends 21c of slot-accommodated portions 21a protruding from slots 13 in the Z direction. Then, the Z2-side tip ends of bus members 22 and tip ends 21c of slot-accommodated portions 21a are joined (connected) to each other by welding (for example, TIG (Tungsten Inert Gas) welding, MIG (Metal Inert Gas) welding, or laser welding), solid-state welding (for example, diffusion bonding, pressure welding, friction stir welding, or ultrasonic bonding), or the like.

[0043] This allows the tip end 21c of the slot-accommodated portion 21a of the segment coil 21 protruding from the slot 13 to be connected to the bus member 22 arranged along the C direction (circumferential direction) of the stator 100 without performing a separate bending process on the segment coil 21. In other words, since no bending process is performed on each of the multiple segment coils 21 on which the anodic oxide coating 32 is formed, the multiple segment coils 21 can be connected to each other via the bus member 22 while preventing cracks from occurring in the anodic oxide coating 32 formed on the segment coil 21, unlike when bending process is performed on each of the multiple segment coils 21 on which the anodic oxide coating 32 is formed.

[0044] [Second embodiment] (Stator configuration) The configuration of a stator 200 according to a second embodiment of the present invention will be described with reference to Fig. 11. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals.

[0045] 11, the stator 200 includes a coil section 220. The coil section 220 includes a plurality of segment coils 221. Unlike the coil section 20 of the stator 100 of the first embodiment, the coil section 220 does not include a bus member 22.

[0046] The segment coil 221 includes a one-side segment coil 221A arranged on the Z1 side and a other-side segment coil 221B arranged on the Z2 side. The coil end portion 221b of the one-side segment coil 221A is arranged on the Z1 side of the stator core 10. The coil end portion 221b of the other-side segment coil 221B is arranged on the Z2 side of the stator core 10. The tip portion 221c (on the Z2 side) of the slot-accommodated portion 221a of the one-side segment coil 221A and the tip portion 221c (on the Z1 side) of the slot-accommodated portion 221a of the other-side segment coil 221B are connected within the slot 13 by welding, solid-state welding, or the like.

[0047] The other configurations of the stator 200 of the second embodiment are similar to those of the stator 100 of the first embodiment.

[0048] (Method of manufacturing a stator) Next, a method of manufacturing the stator 200 according to the second embodiment of the present invention will be described with reference to FIGS.

[0049] 12, similarly to the method for manufacturing the stator 100 according to the first embodiment, a coil processing step (S110), a degreasing step (S120), an anodizing treatment step (S130), and an insulating coating formation step (S140) are performed in this order. That is, similarly to the method for manufacturing the stator 100 according to the first embodiment, the anodizing treatment step (S130) is performed after the coil bending step (S112).

[0050] This allows the anodic oxide coating 32 to be formed relatively thick in the anodizing treatment step (S130), similar to the method for manufacturing the stator 100 according to the first embodiment. As a result, similar to the method for manufacturing the stator 100 according to the first embodiment, the anodic oxide coating 32 formed on the coil wire 31 can be made relatively thick while preventing cracks from occurring in the anodic oxide coating 32.

[0051] <Coil placement process> Next, in step S250, a coil arrangement process is performed as shown in Fig. 12. As shown in Fig. 11, the coil arrangement process (250) is a process of arranging the plurality of segment coils 221 on the stator 100 so that the slot-accommodated portions 221a are accommodated in the slots 13 of the stator 100 such that the tip end 221c of the slot-accommodated portion 221a, which is the joint portion of the one-side segment coil 221A on the Z1 side (one side in the axial direction of the stator 100), and the tip end 221c of the slot-accommodated portion 221a, which is the joint portion of the other-side segment coil 221B on the Z2 side (the other side in the axial direction of the stator 100), face each other in the Z direction (the axial direction of the stator 100). Specifically, the slot accommodating portion 221a of the one-side segment coil 221A is inserted into the slot 13 from the Z1 side, and the slot accommodating portion 221a of the other-side segment coil 221B is inserted into the slot 13 from the Z2 side, so that the tip portion 221c of the slot accommodating portion 221a of the one-side segment coil 221A and the tip portion 221c of the slot accommodating portion 221a of the other-side segment coil 221B come into contact in the Z direction.

[0052] <In-slot connection process> Next, as shown in Fig. 12, an intra-slot connecting process is performed in step 260. As shown in Fig. 11, the intra-slot connecting process (S260) is a process of connecting the tip 221c of the slot-accommodated portion 221a of the one-side segment coil 221A to the tip 221c of the slot-accommodated portion 221a of the other-side segment coil 221B within the slot 13. Specifically, the tip 221c of the slot-accommodated portion 221a of the one-side segment coil 221A to the tip 221c of the slot-accommodated portion 221a of the other-side segment coil 221B are joined (connected) by welding (for example, silver nanowelding), solid-state bonding (for example, diffusion bonding), or the like.

[0053] This allows the tip portion 221c of the slot-accommodated portion 221a of the one-side segment coil 221A to be connected to the tip portion 221c of the slot-accommodated portion 221a of the other-side segment coil 221B without performing a separate bending process on the segment coils 221. In other words, since no bending process is performed on each of the multiple segment coils 221 on which the anodic oxide coating 32 is formed, it is possible to connect the multiple segment coils 221 together while preventing cracks from occurring in the anodic oxide coating 32 formed on the segment coils 221, unlike when bending process is performed on each of the multiple segment coils 221 on which the anodic oxide coating 32 is formed.

[0054] The other steps in the method for manufacturing the stator 200 of the second embodiment are substantially the same as those in the method for manufacturing the stator 100 of the first embodiment.

[0055] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0056] For example, in the first and second embodiments, the anodizing treatment step (S130) is an example of a step of forming an anodic oxide coating 32 having a thickness of more than 1 μm and not more than 20 μm on the coil wire 31 by anodizing treatment, but the present invention is not limited to this. In the present invention, the anodizing treatment step may be configured as a step of forming an anodic oxide coating having a thickness of more than 20 μm on the coil wire by anodizing treatment. [Explanation of symbols]

[0057] 13...slot, 21, 221...segment coil, 21a, 221a...slot receiving portion, 21c, 221c...tip portion (of slot receiving portion), 31...coil wire, 32...anodized coating, 33...insulating coating, 100, 200...stator

Claims

1. a coil bending step of bending a coil wire material that is not provided with an insulating coating and is mainly composed of aluminum or an aluminum alloy so as to form a U-shaped segment coil to be disposed in a stator; an anodizing treatment process in which, after the coil bending process, an anodizing coating is formed on the segment coil by anodizing treatment in a state in which the tip end portion of the slot-accommodated portion, which becomes the joint portion of the segment coil, is exposed from the anodizing treatment bath; an insulating coating formation process in which, after the anodizing process, the tip end of the slot accommodating portion, which becomes the joint of the segment coil on which the anodized coating is formed, is exposed from the treatment bath for electrocoating, and the insulating coating, which is mainly composed of resin, is formed on the segment coil on which the anodized coating is formed by electrocoating; A method for manufacturing a stator, comprising a coil arrangement process of arranging the segment coil in the stator after the insulating coating formation process.

2. The coil arrangement step is a step of arranging the plurality of segment coils in the stator such that the tip end of the slot accommodation portion, which is the joint portion of each of the plurality of segment coils, is accommodated in the slot so that the slot accommodation portion protrudes from the slot of the stator, 2. The method for manufacturing a stator according to claim 1, further comprising, after the coil arrangement process, a bus member connection process for connecting the tip ends of the slot-accommodated portions of the plurality of segment coils to each other by a bus member arranged along the circumferential direction of the stator.

3. The coil arrangement process is a process of arranging the plurality of segment coils in the stator so that the slot accommodation portions are accommodated in the slots of the stator such that the tip end portion of the slot accommodation portion, which is the joint portion of one side segment coil on one side of the stator in the axial direction, and the tip end portion of the slot accommodation portion, which is the joint portion of the other side segment coil on the other side of the axial direction, face each other in the axial direction, 2. A method for manufacturing a stator as described in claim 1, further comprising, after the coil arrangement process, an intra-slot connection process for connecting the tip end of the slot-accommodated portion of the one-side segment coil and the tip end of the slot-accommodated portion of the other-side segment coil within the slot.

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