Method for manufacturing a stator

Abstract

A method of manufacturing a stator having a stator core with a plurality of slots extending in an axial direction, the method comprising: a forming step of forming a ring-shaped coil wound with a plurality of turns of a coil wire; a holding step of holding the coil to a vane disposed on an inner radial side of the stator core in a circumferential direction and extending in the axial direction; an inserting step of moving a coil moving mechanism disposed on an inner radial side of the vane in the axial direction to insert the coil into the slot from one side to the other side in the axial direction; and a moving step of moving a coil end of the coil held on the inner radial side of the vane to an outer radial side of the vane and the other side in the axial direction of the stator core, wherein in the moving step, the coil end is divided into a plurality of groups and moved by each group.

Description

TECHNICAL FIELD

[0001] The present application relates to a manufacturing method of a stator. BACKGROUND

[0002] In the past, a coil insertion method in which a coil bundle of annular coils in which coil wires are wound is inserted into a slot of a stator core has been known. For example, in Japanese Patent Application Publication No. 1-274645 (Patent Literature 1), a coil insertion method is disclosed in which, when a coil driven by a stripper is in substantial contact with an end surface of a stator core, a movable blade is moved together with the stripper to protrude a predetermined length from an end surface on the opposite side of the stator core, and then the movable blade is retracted to a coil release position.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 5-236712

[0006] However, in the coil insertion method of the above-described Patent Literature 1, there is room for improvement in the shortening of the length of the end portion of the coil (hereinafter also referred to as the coil end) protruding from the stator core. SUMMARY

[0007] In view of the above-described problems, an object of the present application is to provide a manufacturing method of a stator in which the coil end is shortened.

[0008] The manufacturing method of a stator of the first aspect of the present application is a manufacturing method of a stator provided with a stator core having a plurality of slots that pass through in the axial direction, the manufacturing method including: a forming step of forming an annular coil in which a plurality of coil wires are wound; a holding step of holding the coil on a blade that is disposed on the radially inner side of the stator core in the circumferential direction and extends in the axial direction; an insertion step of moving a coil moving mechanism disposed on the radially inner side of the blade in the axial direction to insert the coil into the slot from one side to the other side in the axial direction; and a moving step of moving a coil end of the coil held on the radially inner side of the blade to the radially outer side of the blade and the other side in the axial direction of the stator core, in which, in the moving step, the coil end is divided into a plurality of groups and moved by each group.

[0009] The present application can provide a manufacturing method of a stator in which the coil end is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic view of a cross section perpendicular to the axial direction of the stator.

[0011] Figure 2 is a perspective view schematically showing the manufacturing method of the stator of the embodiment.

[0012] Figure 3is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0013] Figure 4 is a flowchart showing a manufacturing method of a stator of the embodiment.

[0014] Figure 5 is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0015] Figure 6 is a perspective view schematically showing a linkage process of the embodiment.

[0016] Figure 7 is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0017] Figure 8 is a perspective view schematically showing a release process of the embodiment.

[0018] Figure 9 is a perspective view schematically showing a return process of the embodiment.

[0019] Figure 10 is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0020] Figure 11 is an enlarged view schematically showing a manufacturing method of a stator of the embodiment.

[0021] Figure 12 is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0022] Figure 13 is an enlarged view schematically showing a manufacturing method of a stator of the embodiment.

[0023] Figure 14 is a cross-sectional view schematically showing a manufacturing method of a stator of the embodiment.

[0024] Figure 15 is an enlarged view schematically showing a manufacturing method of a stator of the embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, an embodiment of the present application will be described with reference to the drawings. In addition, in the following drawings, the same reference numerals are applied to the same or equivalent portions, and the description thereof will not be repeated.

[0026] Furthermore, in the following description, the direction in which the central axis of stator 1 extends, i.e., the direction through which the slot passes, is defined as the "axial direction". One side along the axial direction is designated as the lower (rear) side, and the other side as the upper (front) side. The upper (lower) and lower (fronter) directions are used to determine positional relationships and are not limited to actual directions. That is, the lower direction does not necessarily mean the direction of gravity. The axial direction is not particularly limited and includes the vertical direction, the horizontal direction, and directions intersecting these directions.

[0027] Furthermore, the direction orthogonal to the central axis of stator 1 is defined as "radial". One side along the radial direction is defined as the inner side, and the other side is defined as the outer side. Moreover, the direction along the arc centered on the central axis of stator 1 is defined as "circumferential".

[0028] Furthermore, in the accompanying drawings used in the following description, characteristic parts are sometimes shown enlarged for emphasis and convenience. Therefore, the dimensions and proportions of the constituent elements may not be the same as the actual dimensions. Additionally, for the same purpose, non-characteristic parts are sometimes omitted from the illustration.

[0029] (stator)

[0030] like Figure 1 As shown, the stator 1 is a component of the motor that interacts with the rotor (not shown) to generate rotational torque. In this embodiment, the stator 1 is a distributed winding with coil wire wound across several slots 21. The stator 1 has coils 10 and a stator core 20.

[0031] Stator core

[0032] The stator core 20 is formed into a hollow cylindrical shape. The stator core 20 is formed by overlapping thin silicon steel sheets. A plurality of pole teeth 23 are radially formed on the stator core 20. Grooves 21 are formed between the pole teeth 23. The pole teeth 23 extend radially across the grooves 21. Groove openings 22, serving as radial openings, are formed on the grooves 21. The stator core 20 of this embodiment is a one-piece stator core.

[0033] <coil>

[0034] Coil 10 is a loop-shaped coil bundle in which coil wire is wound into a ring. In this embodiment, the coil wire is a round wire, but it is not particularly limited and can also be a flat wire, etc.

[0035] The coil 10 has two coil edges and a coil end. The two coil edges are housed in slots 21. Specifically, the slot 21 for housing one coil edge is different from the slot 21 for housing the other coil edge. The slot 21 for housing one coil edge and the slot 21 for housing the other coil edge can be arranged as follows: Figure 1 They can be arranged circumferentially with other slots as shown, or adjacent to each other (not shown).

[0036] <wedge>

[0037] The wedge 30 is positioned between the coil 10 and the slot opening 22, and the coil 10 is arranged in the slot 21. The wedge 30 blocks the slot opening 22. The wedge 30 insulates the stator core 20 from the coil 10. The axial length of the wedge 30 is greater than the axial length of the slot 21.

[0038] The wedge 30 of the present embodiment is U-shaped when viewed in the axial direction. Specifically, it includes a circumferential portion extending in the circumferential direction and two radial portions extending from both end portions of the circumferential portion toward the radially outer side. The circumferential portion and the radial portions can be formed of one member, or can be connected to different members.

[0039] <insulating paper>

[0040] As shown in Figure 1 , the insulating paper 40 covers the coil 10 inserted into the slot 21. The insulating paper 40 is arranged along the tooth that divides the space other than the radially inner side in the slot 21. The insulating paper 40 of the present embodiment is U-shaped. In Figure 1 , the opening of the insulating paper 40 and the opening of the wedge 30 are in opposite directions to each other.

[0041] In addition, the insulating paper 40 can also have a flange portion (not shown) that protrudes from the end surface of the stator core 20 on the one axial side and is folded back, or can have a flange portion (not shown) that protrudes from the end surface of the stator core 20 on the other axial side and is folded back.

[0042] (coil insertion device)

[0043] Referring to Figures 1 to 3 , the coil insertion device 100 will be described. Figure 2 and Figure 3 The coil insertion device 100 shown in the drawing inserts the annular coil 10 in which a coil wire is wound into a plurality of slots 21 that pass through the stator core 20 in the axial direction by relatively moving the coil 10 from the one axial side toward the other axial side. Specifically, the coil insertion device 100 inserts the coil 10 from each slot opening 22 in a manner that straddles several slots 21 of the stator core 20.

[0044] The coil insertion device 100 has: Figure 2 and Figure 3 a plurality of blades 110; a stripper 120 as a coil moving mechanism; and Figure 3 a blade pedestal 130.

[0045] <blade>

[0046] As shown in Figure 2 and Figure 3As shown, the vane 110 holds the coil 10. The vane 110 is arranged at a radially inner side of the stator core 20 and a radially outer side of the stripper 120 in a circumferential direction of the stator core 20, and extends in an axial direction. With the vane 110, it is possible to easily insert the coil 10 into the slot 21.

[0047] The vane 110 moves in the axial direction at least in the moving process (S40) described later. Thereby, in the inserting process (S30) and the moving process (S40) described later, it is possible to reduce a load generated on the coil 10. The vane 110 of the present embodiment is a movable vane which moves in the axial direction.

[0048] The vanes 110 are arranged in a circumferential direction of the stator core 20. Here, the vanes 110 are arranged with the plurality of pole teeth 23 interposed therebetween. In detail, the plurality of vanes 110 are provided on the same circumference in correspondence with the pole teeth 23.

[0049] The vane 110 has a shape arranged in the slot opening 22. The vane 110 is a rod-like member which extends in the axial direction.

[0050] The radially outer end edge of the vane 110 of the present embodiment is positioned at a radially inner side than the radially inner end edge of the stator core 20, but can be positioned at a radially outer side than the radially inner end edge of the stator core 20.

[0051] <Stripper>

[0052] The stripper 120 is a coil moving mechanism which moves the coil 10. The stripper 120 is arranged at a radially inner side of the stator core 20, and moves in the axial direction.

[0053] The stripper 120 inserts the coil 10 from one side to the other side in the axial direction. The stripper 120 is in contact with the coil 10. With the stripper 120, the coil 10 moves in the axial direction at the radially inner side of the stator core 20, and a part of the coil 10 is inserted inside the slot 21 from the slot opening 22. Specifically, the stripper 120 hooks the radially inner side of the coil 10, and pulls up the coil 10 along the vane 110.

[0054] <Vane seat>

[0055] The vane seat 130 is arranged at a radially inner side of the stator core 20 and at one side of the stripper 120 in the axial direction. The vane seat 130 holds the vane 110. Here, the vane seat 130 holds one end of the plurality of vanes 110.

[0056] The vane seat 130 and the plurality of vanes 110 can be constituted by one member, or can be constituted by different members.

[0057] The stripper 120 has a shape arranged in the slot opening 22. In the present embodiment, an end portion of the other side in the axial direction of the stripper 120 is hemispherical.

[0058] The radially outer end edge of the stripper 120 of the present embodiment is positioned radially inward of the radially inner end edge of the stator core 20, but can be positioned radially outward of the radially inner end edge of the stator core 20.

[0059] (Method of manufacturing stator)

[0060] Reference Figures 1 to 15 A method of manufacturing a stator 1 provided with a stator core 20 having a plurality of slots 21 that pass through in the axial direction will be described. In the present embodiment, the stator 1 is manufactured using the above-described coil insertion device 100.

[0061] First, as shown in FIG. 10, a forming process (S10) of forming a ring-shaped coil in which a plurality of turns of coil wire are wound is performed. In the forming process (S10), the coil wire is wound into a ring shape, and a coil 10 is formed that has two coil edge portions housed in the slots 21 and a coil end portion connecting the two coil edge portions and disposed on both axial sides of the stator core 20. Figure 4 In the present embodiment, as shown in FIG. 11, the coil end portion C on the other axial side of the coil 10 is inclined toward the radially inner side. The coil end portion C is divided into a first group C1, a second group C2, and a third group C3. In addition, in a state in which the coil edge portions are inserted into the slots 21, the first group C1, the second group C2, and the third group C3 are positioned from the radially outer side toward the radially inner side.

[0062] Figure 2 Figure 1

[0063] Next, a holding process (S20) of holding the coil 10 on the vanes 110, which are disposed in the circumferential direction on the radially inner side of the stator core 20 and extend in the axial direction, is performed. In the holding process (S20), as shown in FIG. 12, the coil insertion device 100 is disposed on the axial one side of the stator core 20. In addition, the stripper 120 is disposed on the radially central side of the plurality of vanes 110 and on the axial one side. Furthermore, as shown in FIG. 13, the coil 10 formed in the forming process (S10) is disposed between the plurality of vanes 110 in a manner of being held therebetween. Figure 3 Figure 2

[0064] Next, an insertion process (S30) of moving the stripper 120, which is a coil moving mechanism, disposed on the radially inner side of the vanes 110 in the axial direction, to insert the coil 10 into the slots 21 from the axial one side toward the other side is performed. In the insertion process (S30), as shown in FIG. 14, the stripper 120 is moved from the axial one side toward the other side. Figures 3 to 5

[0065] In the present embodiment, in order to insert the coil edge portions of the coil 10 into the slots 21, as shown in FIG. 15, the first group C1 of the coil end portion C is moved from the radially outer side toward the radially inner side.​​​​​​Figure 6 As shown, the vane 110 and the stripper 120 are moved from one axial side to the other side (hereinafter, this process is also referred to as "linkage process"). Thereby, both of the coil end portions of the coil 10 are arranged in the slots 21. At this time, the coil end portion on the one axial side straddles between the slots 21 on one side of the stator core 20. On the other hand, the coil end portion C on the other axial side does not protrude from the end surface (hereinafter, also referred to as "other end surface") on the other axial side of the stator core 20, but is held on the radially inner side of the vane 110.

[0066] Next, a moving process (S40) of moving the coil end portion C held on the radially inner side of the vane 110 and on the other axial side of the stator core 20 to the radially outer side of the vane 110 and the other axial side of the stator core 20 is performed. In the moving process (S40), the coil end portion C is divided into a plurality of groups, and is moved by each group. In this way, in the moving process (S40), the coil end portion C is divided into a plurality of groups, and is moved to the radially outer side of the vane 110 and the other axial side of the stator core 20 by each group. By dividing the movement of the coil end portion C into a plurality of times, compared to the case where the coil end portion C is moved to the radially outer side of the vane 110 and the other axial side of the stator core 20 at once, the coil end portion C can be shortened.

[0067] The moving process (S40) preferably moves the coil end portion C in 2 or more groups and 4 or less groups, and more preferably moves the coil end portion C in 3 groups. In the moving process (S40) of the present embodiment, the coil end portion C is moved in 3 groups. Thereby, the coil end portion C can be shortened, and the time required for the moving process (S40) can be shortened.

[0068] Specifically, in the moving process (S40), the coil end portion C is divided into a first group C1, a second group C2, and a third group C3, and is moved in the order of the first group C1, the second group C2, and the third group. That is, the moving process (S40) includes a first moving process (S41) of moving the first group C1, a second moving process (S42) of moving the second group C2 performed after the first moving process (S41), and a third moving process (S43) of moving the third group C3 performed after the second moving process (S42).

[0069] In the first moving process (S41), as shown in FIG. 6A, the linkage process is performed, and the first group C1 protrudes from the other end surface of the stator core 20. In this state, as shown in FIG. 6B, the stripper 120 and the vane 110 are moved to the one axial side (hereinafter, this process is also referred to as "release process"). Thereby, since the stripper 120 does not push the coil 10 to the other axial side, the coil 10 can be inhibited from being sandwiched by the vane 110. Figure 7 Figure 8 Next, as shown in FIG. 6C, the linkage process is performed, and the second group C2 protrudes from the other end surface of the stator core 20. In this state, as shown in FIG. 6D, the stripper 120 and the vane 110 are moved to the one axial side (hereinafter, this process is also referred to as "release process"). Thereby, since the stripper 120 does not push the coil 10 to the other axial side, the coil 10 can be inhibited from being sandwiched by the vane 110.

[0070] Next, as shown in FIG. 6E, the linkage process is performed, and the third group C3 protrudes from the other end surface of the stator core 20. In this state, as shown in FIG. 6F, the stripper 120 and the vane 110 are moved to the one axial side (hereinafter, this process is also referred to as "release process"). Thereby, since the stripper 120 does not push the coil 10 to the other axial side, the coil 10 can be inhibited from being sandwiched by the vane 110. Figure 9 ​As shown, the stripper 120 is stopped, and the blade 110 is moved axially to one side (hereinafter, this process will also be referred to as the "return process"). Thus, the release process is performed before the return process. No other processes are performed between the release process and the return process. The return process is performed as follows: Figure 10 As shown, the blade 110 is returned to the vicinity of the other end face of the stator core 20. Through this return process, as... Figure 11 As shown, the first group C1 of the coil end C is not held by the blade 110, but the second group C2 and the third group C3 of the coil end C are held by the blade 110.

[0071] After that, as Figure 12 As shown, a linkage process is implemented to move the blade 110 and the stripper 120 axially. By implementing this linkage process, as... Figure 13 As shown, the first group C1 of the coil end C can be moved radially outward of the blade 110 and axially to the other side of the stator core 20.

[0072] Next, the second moving step (S42) is performed. In the second moving step (S42), the release and return steps are performed in the same way as in the first moving step (S41), so that the blade 110 returns to the vicinity of the other end face of the stator core 20. In this state, a linkage step is performed, such as... Figure 14 As shown, this causes the blade 110 and the stripper 120 to move. Thus, as... Figure 15 As shown, the second group C2 can be moved radially outward from the blade 110 and axially to the other side of the stator core 20.

[0073] Next, the third moving step (S43) is performed. In the third moving step (S43), unlike the first moving step (S41) and the second moving step (S42), the release step and the return step are not performed, but the linkage step is performed. As a result, the third group C3 can be moved to the radially outer side of the blade 110 and to the axial side of the stator core 20.

[0074] Thus, in the case of n moving operations (divided into n groups), in the first to (n-1) operations, a release operation and a return operation are performed for the delivery of the coil end C (the movement of the coil end C radially outward from the blade 110 and axially to the other side of the stator core 20). In the nth operation, the release operation and the return operation for delivery are not performed.

[0075] Furthermore, during the moving process (S40), the position of the blade 110 differs in at least two groups. Additionally, the position of the blade 110 is not common across all groups.

[0076] In the moving step (S40), the position of the vane 110 at the time of moving the last group is further axially on the other side than the position of the vane 110 at the time of moving at least one of the other groups. That is, in the case where the moving step (S40) is implemented n times (divided into n groups), the position of the vane 110 in the nth moving step is further axially on the other side than the position of the vane 110 in at least one of the first to (n-1)th moving steps. Thus, the poor insertion of the wedge 30 and the coil 10 into the slot 21 can be reduced. In the present embodiment, in the moving step (S40), the position of the vane 110 at the time of moving the last group is further axially on the other side than the position of the vane 110 at the time of moving the first group.

[0077] In the present embodiment, the position of the vane 110 at the time of moving the third group C3 in the third moving step (S43) is further axially on the other side than the position of the vane 110 at the time of moving the first group Cl in the first moving step (S41). In detail, the position of the vane 110 at the time of moving the second group C2 in the second moving step (S42) is further axially on the other side than the position of the vane 110 at the time of moving the first group Cl in the first moving step (S41). Also, the position of the vane 110 at the time of moving the third group C3 in the third moving step (S43) is further axially on the other side than the position of the vane 110 at the time of moving the second group C2 in the second moving step (S42).

[0078] In addition, in the moving step (S40), the number of coil wires of the group moved last is 1 / 4 or more of the number of slots into which one coil is inserted. Thus, since the coil wires of the group moved last can be ensured, the poor insertion of the wedge into the slot 21 can be reduced.

[0079] In the present embodiment, the number of coil wires of the first group Cl, the number of coil wires of the second group C2, and the number of coil wires of the third group C3 are substantially the same. In addition, in the case where the coil end C is moved in two groups in the moving step (S40), the number of coil wires of the group moved last is less than the number of coil wires of the group moved first. In the case where the coil end C is moved in four groups in the moving step (S40), the number of coil wires of the last group is more than the number of coil wires of the group moved immediately before.

[0080] By implementing the above steps (S10 to S40), the stator 1 shown in FIG. 1 can be manufactured. Figure 1 In the stator 1 thus manufactured, the height of the coil end C on the other side of the axial direction of the coil 10 (the protruding height of the coil 10 from the other end surface of the stator core 20) can be reduced.

[0081] In addition, in the case where the coil end C is moved in two groups in the moving step (S40), the number of coil wires of the group moved last is less than the number of coil wires of the group moved first. Figure 2 , Figure 3 , Figures 5 to 15The wedge 30 is not shown in the drawing, but is inserted into the slot 21 using a wedge guide, a wedge push rod, or the like when the coil 10 is inserted.

[0082] In addition, in Figure 2 , Figures 5 to 15 , Figure 1 The insulating paper 40 is not shown in the drawing, but a process of covering the coil 10 inserted into the slot 21 with the insulating paper 40 is also provided. In this process, the insulating paper 40 can also be previously arranged in the slot 21, and the coil 10 can be inserted into the slot 21. Alternatively, the coil 10 covered with the insulating paper 40 can be inserted into the slot 21.

[0083] The manufacturing method of the stator described above is applicable to a method of manufacturing a stator of an N-phase motor. In this case, the insertion process (S30) and the moving process (S40) are performed for each phase, and in the moving process (S40), the position of the vane 110 differs in at least two phases.

[0084] Also, in the moving process (S40), the position of the vane 110 at the time of moving the last phase is further toward the other side in the axial direction than the position of the vane 110 at the time of moving at least one of the other phases. For example, in the case of manufacturing the stator 1 of a three-phase motor, the position of the vane 110 in the moving process (S40) of the W phase, which is the last to be inserted, is further toward the other side in the axial direction than the position of the vane 110 in the moving process (S40) of the U phase, which is the first to be inserted. The insertion resistance of the wedge 30 is large in the last to be inserted phase (W phase) due to the influence of the coil end of the phase (U phase, V phase) that has been inserted. Here, by positioning the vane 110 in the moving process (S40) of the last to be inserted phase (W phase) further toward the other side in the axial direction, the insertion resistance of the wedge 30 can be reduced.

[0085] (Modified example)

[0086] In the above-described embodiment, as shown in ​ , the two slots 21 into which the coil is inserted are one slot 21 and another slot 21 that sandwich three slots 21, but are not limited thereto.

[0087] In addition, in the above-described embodiment, a method of inserting one coil 10 into two slots 21 is exemplified. A plurality of coils 10 can also be simultaneously inserted into four or more slots 21.

[0088] It should be considered that the embodiments disclosed this time are examples in all respects and are not limited to the embodiments. The scope of the present application is not shown by the above-described embodiments, but is shown by the scope of the claims and is intended to include all modifications equivalent in meaning and scope to the claims.

[0089] 1: Stator

[0090] 10: Coil

[0091] 20: stator core

[0092] 21: slot

[0093] 100: coil insertion device

[0094] 110: blade

[0095] 120: stripper

[0096] 130: blade seat

[0097] C: coil end

[0098] C1: first group

[0099] C2: second group

[0100] C3: third group

Claims

1. A method of manufacturing a stator including a stator core having a plurality of slots extending through in an axial direction, the method comprising: a forming step of forming a coil in a ring shape wound with a plurality of turns of coil wire; a holding step of holding the coil on a vane disposed in a plurality in a circumferential direction on an inner side in a radial direction of the stator core and extending in the axial direction; an inserting step of moving a coil moving mechanism disposed on an inner side in the radial direction of the vane in the axial direction to insert the coil into the slots from one side to the other side in the axial direction; and a moving step of moving a coil end of the coil held on the inner side in the radial direction of the vane to an outer side in the radial direction of the vane and the other side in the axial direction of the stator core, wherein in the moving step, the coil end is divided into a plurality of groups and moved for each of the groups, the vane is moved in the axial direction at least in the moving step, and the moving step includes a step of stopping the coil moving mechanism and moving the vane to one side in the axial direction.

2. The method of manufacturing a stator according to claim 1, wherein the moving step includes a step of moving the coil moving mechanism and the vane to one side in the axial direction.

3. The method of manufacturing a stator according to claim 1, wherein in the moving step, the position of the vane differs among at least two of the groups.

4. The method of manufacturing a stator according to claim 2, wherein in the moving step, the position of the vane differs among at least two of the groups.

5. The method of manufacturing a stator according to claim 3, wherein in the moving step, the position of the vane when the last of the groups is moved is further to the other side in the axial direction than the position of the vane when at least one of the other groups is moved.

6. The method of manufacturing a stator according to claim 4, wherein in the moving step, the position of the vane when the last of the groups is moved is further to the other side in the axial direction than the position of the vane when at least one of the other groups is moved.

7. The method of manufacturing a stator according to any one of claims 1 to 4, wherein a stator of an N-phase motor is manufactured, the inserting step and the moving step are performed for each of the phases, and in the moving step, the position of the vane differs among at least two of the phases.

8. The method of manufacturing a stator according to claim 7, wherein in the moving step, the position of the vane when the last of the phases is moved is further to the other side in the axial direction than the position of the vane when at least one of the other phases is moved.

9. The method of manufacturing a stator according to any one of claims 1 to 6, wherein in the moving step, the number of turns of coil wire of the last of the groups to be moved is more than 1 / 4 of the number of turns inserted into one of the slots.

10. The method of manufacturing a stator according to any one of claims 1 to 6, wherein in the moving step, the coil end is divided into three groups and moved. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images