Manufacturing apparatus for stator

Abstract

To provide a manufacturing apparatus for a stator that can achieve high efficiency in a motor.SOLUTION: A manufacturing apparatus for a stator having a pair of jigs. Each of the pair of jigs includes an engaging portion for engaging a U-shaped segment coil, and the pair of jigs are inserted into a coil end portion of the segment coil, and the engaging portion of one jig is slid from an outer periphery side of the coil end portion toward an inner periphery side, and the engaging portion of the other jig is slid from the inner periphery side of the coil end portion toward the outer periphery side, thereby bringing the coil end portions of different segment coils closer together and joining them.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a manufacturing apparatus for a stator. [Background technology]

[0002] Patent Document 1 discloses a clamping jig that clamps the ends of segment coils inserted into a stator before welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 159865 Summary of the Invention [Problem to be solved by the invention]

[0004] To improve the efficiency of the motor, it is necessary to shorten the distance from the end face of the stator to the coil end. With the clamping jig disclosed in the aforementioned Patent Document 1, if the distance from the curved portion of the segment coil formed by twisting to the coil end is short, there is a risk that the clamping jig and the segment coil will be welded together during welding. As a result, the distance from the end face of the stator to the coil end cannot be shortened, resulting in a poor motor efficiency.

[0005] The present disclosure has been made in consideration of the above circumstances, and provides a stator manufacturing device that can improve the efficiency of motors. [Means for solving the problem]

[0006] The stator manufacturing apparatus according to the present disclosure comprises: A stator manufacturing apparatus having a pair of jigs, Each of the pair of jigs is provided with an engaging portion for engaging a U-shaped segment coil, A pair of jigs is inserted into the coil end portion of the segment coil, The engaging portion of one jig is slid from the outer periphery side of the coil end portion toward the inner periphery side, and the engaging portion of the other jig is slid from the inner periphery side of the coil end portion toward the outer periphery side, thereby bringing the coil end portions of the different segment coils closer together and joining them. [Effects of the Invention]

[0007] The present disclosure makes it possible to provide a stator manufacturing device that can achieve high motor efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] 3A and 3B are a perspective view and an enlarged view of a stator; [Figure 2] 1 is a perspective view of a manufacturing device for a stator according to a first embodiment. [Figure 3] FIG. 3 is a flowchart showing a method for manufacturing the stator according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and for clarity of explanation, duplicate explanations are omitted as necessary. In addition, some reference numerals are omitted to avoid cluttering the drawings. Naturally, the right-handed xyz Cartesian coordinate system shown in the drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive direction of the z axis is vertically upward, and the xy plane is the horizontal plane.

[0010] (Embodiment 1) <Stator> First, the stator will be described with reference to Fig. 1. Fig. 1 is a perspective view and an enlarged view of the stator. The upper part of Fig. 1 is a perspective view of the stator. The lower part of Fig. 1 is an enlarged view of the stator.

[0011] The stator 10 shown in FIG. 1 is a stator after the segment coils 12 are inserted and the coil end portions 15 are twisted and formed.

[0012] As shown in the upper part of Fig. 1, stator 10, which is the stator of a rotating electrical machine, has stator core 11 and multiple U-shaped segment coils 12. Segment coil 12a and segment coil 12b are shown in the lower part of Fig. 1. Stator core 11 is made up of approximately cylindrical electromagnetic steel sheets stacked in the axial direction of stator 10 (the z-axis direction in Fig. 1), and is provided with teeth 16 protruding toward the inner periphery and slots 13.

[0013] Slots 13 are formed between adjacent teeth 16. Slots 13 are recesses extending a predetermined thickness from the inner peripheral surface of stator 10 toward the outer peripheral surface. Teeth 16 and slots 13 are alternately formed in stator core 11 in the circumferential direction of stator core 11. Hereinafter, the circumferential direction refers to the circumferential direction of stator core 11, and is the direction indicated by the arrows in the upper part of FIG. 1. Furthermore, the radial direction refers to the direction from the outer periphery of stator core 11 toward the center of stator core 11, and is the direction indicated by the arrows in the upper part of FIG. 1.

[0014] In the example shown in the upper part of Fig. 1, two different segment coils 12 are joined at coil joints 14 at the ends of the conductor wires. A plurality of coil joints 14 are arranged in the circumferential direction at the coil end portions 15 of the segment coils 12.

[0015] In the upper part of Fig. 1, the coil joints 14 are arranged in four rows in the radial direction, but it is preferable to arrange the segment coils 12 in accordance with the radial length of the slots 13. In order to join the segment coils 12 together, the coil joints 14 have had their insulating coating removed, exposing the metal base.

[0016] <Configuration of stator manufacturing equipment>

[0017] Next, the configuration of a stator manufacturing apparatus will be described with reference to Figures 1 and 2. Figure 2 is a perspective view of the stator manufacturing apparatus according to the first embodiment.

[0018] 2, the stator manufacturing apparatus has a pair of jigs 50 and 60. As shown in Fig. 2, jig 50 has a shape in which the thickness in the x-axis direction decreases from the positive y-axis direction to the negative y-axis direction so that jig 50 can be inserted into coil end portion 15.

[0019] As shown in Fig. 2, the jig 50 has engaging portions 51 to 54. As shown in Fig. 2, the engaging portions 51 to 54 have a convex shape that protrudes in the negative direction of the z axis. As shown in the lower part of Fig. 1, the engaging portion 51 engages with the segment coil 12a.

[0020] More specifically, the engaging portion 51 engages with the curved portion 121 of the segment coil 12a by abutting against the outer circumferential side. The outer circumferential side of the engaging portion 51 is the radially outer side of the stator shown in the upper part of Fig. 1. The curved portion 121 of the segment coil 12a is coated.

[0021] Like the engaging portion 51, the engaging portion 52 engages with the curved portion of the segment coil 12c, which is located more inward than the segment coil 12a, by abutting it from the outer periphery. The engaging portions 53 and 54 are similar.

[0022] As shown in FIG. 2, the jig 60 has a shape in which the thickness in the x-axis direction decreases from the positive y-axis direction to the negative y-axis direction so that the jig 60 can be inserted into the coil end portion 15.

[0023] As shown in Fig. 2, the jig 60 has engaging portions 61 to 64. As shown in Fig. 2, the engaging portions 61 to 64 have a convex shape that protrudes in the negative direction of the z axis. As shown in the lower part of Fig. 1, the engaging portions 61 to 64 engage with the segment coil 12.

[0024] More specifically, the engaging portion 61 engages with the curved portion 122 of the segment coil 12b by abutting against the inner peripheral side. The inner peripheral side is the radially inner side of the stator shown in the upper part of Fig. 1. The curved portion 122 of the segment coil 12b is coated.

[0025] The engaging portion 62 engages with the curved portion of the segment coil 12d, which is located more inward than the segment coil 12b, by abutting it from the inner circumferential side, similar to the engaging portion 51. The engaging portions 63 and 64 are similar.

[0026] 2, the jigs 50 and 60 each have four engaging portions 51 to 54, 61 to 64 spaced at predetermined intervals. However, this is not limited thereto, and the jigs 50 and 60 may have any configuration as long as they have engaging portions 51, 61 corresponding to the number of coil joining portions 14.

[0027] <Operation of the stator manufacturing equipment> Next, the operation of the stator manufacturing apparatus will be described with reference to Figures 1 and 3. Figure 3 is a diagram showing a flowchart of the method for manufacturing the stator according to the first embodiment.

[0028] First, as shown in Fig. 3, a pair of jigs are inserted into the coil end portion of the segment coil (step ST1). More specifically, as shown in the upper part of Fig. 1, a pair of jigs 50 and 60 are inserted into the coil end portion 15 of the segment coil 12.

[0029] Next, as shown in Fig. 3, the engaging portion of one jig is slid from the outer circumferential side of the coil end portion (the radially outer side of the stator) toward the inner circumferential side (the radially inner side of the stator) (step ST2). Also, as shown in Fig. 3, the engaging portion of the other jig is slid from the inner circumferential side of the coil end portion (the radially inner side of the stator) toward the outer circumferential side (the radially outer side of the stator) to bring the coil end portions of different segment coils closer together (step ST2).

[0030] A more specific description will be given, focusing on the engaging portions 51 and 61 in Fig. 1. As shown in the upper part of Fig. 1, one of the jigs 50 is slid from the outer periphery toward the inner periphery of the coil end portion 15 while maintaining its inserted state in the coil end portion 15. As a result, as shown in the lower part of Fig. 1, the engaging portion 51 moves the position of the segment coil 12a from the outer periphery toward the inner periphery of the coil end portion 15 while abutting against the curved portion 121 of the segment coil 12.

[0031] 1, while the other jig 60 remains inserted in the coil end portion 15, the jig 60 slides from the inner periphery side toward the outer periphery side of the coil end portion 15. As a result, as shown in the lower part of FIG. 1, the engaging portion 61 moves the position of the segment coil 12b from the inner periphery side toward the outer periphery side of the coil end portion 15 while abutting against the curved portion 122 of the segment coil 12.

[0032] In this way, by sliding the jigs 50 and 60 in the radial direction of the stator in a direction that brings them closer to each other, the coil end portions 15 of the different segment coils 12a and 12b are brought closer to each other. Here, attention has been focused on the engaging portion 51 and the engaging portion 61, but the same applies to the engaging portions 52 to 54 and the engaging portions 62 to 64. Therefore, four coil joint portions 14 are formed in the coil end portion 15.

[0033] Next, the four coil joint portions 14 in the coil end portion 15 are joined together (step ST3). For example, the coil joint portions 14 of the different segment coils 12a and 12b shown in Fig. 1 are joined together. The joining method is, for example, welding.

[0034] In this way, in the manufacturing apparatus according to the first embodiment, the jigs 50 and 60 are slid toward each other along the radial direction of the stator, thereby bringing the coil end portions 15 of the different segment coils 12a and 12b closer to each other. With this configuration, the different segment coils 12a and 12b can be joined while adjusting their positions.

[0035] <High efficiency> Conventionally, the coil end was joined while the jig clamped it. This sometimes resulted in welding between the jig and the segment coil. To prevent welding between the jig and the segment coil, it was necessary to increase the length from the curved part of the segment coil to the coil end. This increased the amount of heat generated by the coil, resulting in a lower efficiency of the motor.

[0036] However, in the manufacturing method of the stator according to the first embodiment, the engagement portions 51 and 61 abut against the curved portions of the segment coils, as shown in the lower part of Fig. 1. Therefore, even if the length from the curved portions to the coil end portions of the segment coils is shortened, welding of the jigs 50 and 60 to the segment coils can be suppressed.

[0037] As a result, in the stator manufacturing method according to the first embodiment, the length from the curved portion to the coil end portion of the segment coil can be shortened, the amount of heat generated by the coil can be reduced, and the efficiency of the motor can be improved.

[0038] Furthermore, the stator manufacturing method according to embodiment 1 is advantageous in terms of cost since the length from the curved portion to the coil end portion of the segment coil is shortened, thereby reducing the amount of coil used to manufacture the stator.

[0039] Furthermore, in the method for manufacturing the stator according to the first embodiment, the length from the curved portion of the segment coil to the coil end is shortened, which shortens the length from the end face of the stator to the coil end, thereby enabling the motor to take up less space in the vehicle.

[0040] The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the sake of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention. [Explanation of symbols]

[0041] 10 Stator 11 Stator core 12, 12a, 12b, 12c, 12d segment coils 13 slots 14 Coil joint 15 Coil end 16 Teeth 50, 60 jigs 51-54, 61-64 Engagement parts 121, 122 curved section

Claims

[Claim 1] A stator manufacturing apparatus having a pair of jigs, Each of the pair of jigs is provided with an engaging portion that engages with a U-shaped segment coil, A pair of jigs is inserted into the coil end portion of the segment coil, The engaging portion of one jig is slid from the outer circumferential side of the coil end portion toward the inner circumferential side, and the engaging portion of the other jig is slid from the inner circumferential side of the coil end portion toward the outer circumferential side, thereby bringing the coil end portions of different segment coils closer together and joining them. Stator manufacturing equipment.

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