Coil wire stripping method

Abstract

To provide a conductive composition that maintains high adhesion while keeping resistivity. [Solution] The coil wire stripping method according to the present disclosure is a coil wire stripping method that strips a coil wire 10 by moving a cutter 30 using an eccentric cam mechanism 20 that converts rotational motion into linear motion, wherein the coil wire 10 is stripped when the eccentric cam mechanism 20 is in a predetermined rotational phase, and other tasks are performed in at least part of the cases when the eccentric cam mechanism 20 is not in the predetermined rotational phase.

Description

Technical Field

[0006]

[0001] This disclosure relates to a method for stripping coil wires.

Background Art

[0002] The coil wires constituting the segment coil are, for example, flat copper wires having a rectangular cross-section and are covered with an insulating film around them. When forming the segment coil, usually, the insulating film is stripped from a part of the coil wire. Patent Document 1 discloses a technique for stripping a coil wire by moving a cutter by an eccentric cam mechanism. In the technique disclosed in Patent Document 1, since the eccentric cam mechanism is used, the stripping of the coil wire can be performed at high speed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors have found the following problems regarding the method for stripping coil wires. When using an eccentric cam mechanism, the stripping process is performed only in the case of a predetermined rotational phase, and in the case of other rotational phases, the coil wire is in a standby state. Therefore, there is room for shortening the cycle time of the coil wire stripping device.

[0005] This disclosure has been made in view of such problems, and an object thereof is to provide a method for stripping coil wires that further shortens the cycle time of the coil wire stripping device.

Means for Solving the Problems

[0006] One aspect for achieving the above object is A method for stripping coil wires by moving a cutter using an eccentric cam mechanism that converts rotational motion into linear motion, When the eccentric cam mechanism is in a predetermined rotational phase, the coil wire is stripped off. The eccentric cam mechanism performs other tasks in at least part of the cases where it is not in the predetermined rotational phase. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a coil wire stripping method that further shortens the cycle time of a coil wire stripping apparatus. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing an example of the configuration of a coil wire stripping device according to an embodiment. [Figure 2] This is a schematic diagram illustrating the operation of a coil wire stripping device according to an embodiment. [Modes for carrying out the invention]

[0009] The embodiments of this disclosure will be described in detail below with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant explanations will be omitted as necessary for clarity. For ease of understanding, the scale of each part in the drawings may differ from that of actual parts. In this specification, the "~" indicating a numerical range includes the numbers written before and after it as the lower and upper limits.

[0010] Referring to Figure 1, the configuration of the coil wire stripping apparatus 100 (coil wire stripping apparatus 100 according to the embodiment) for performing the coil wire stripping method according to the embodiment will be described. In addition to the coil wire stripping apparatus 100, Figure 1 also shows the coil wire 10. The coil wire 10 constitutes the stator coil of a rotating electric machine. The coil wire 10 can also be called a conductor segment. A stator coil is formed by inserting a large number of U-shaped coil wires 10 into slots in the stator core and sequentially joining the ends of their lead portions. A rotating electric machine comprises a stator having a stator core around which the stator coil is wound, and a rotor provided on the inner circumference side of the stator. Rotating electric machines are used as electric motors and generators when mounted on electric vehicles such as hybrid cars and electric vehicles.

[0011] The coil wire 10 is a rectangular conductor with a rectangular cross-section. The rectangular conductor is constructed by applying an insulating coating around a metal (conductor) such as copper, which has high conductivity. That is, the conductor is covered with an insulating film. The insulating coating is made of a resin such as enamel, which has high insulating properties. In order to join the ends of the lead portions of the coil wire 10, the insulating film is peeled off the ends of the lead portions of the coil wire 10 in advance, and a part of the internal conductor is cut and shaped. The coil wire stripping device 100 according to this embodiment is a device for stripping the insulating coating provided on the surface of the coil wire 10, and performs processing on the ends of the lead portions of the coil wire 10.

[0012] The coil wire stripping device 100 comprises an eccentric cam mechanism 20, a cutter 30, springs 40a and 40b, clampers 50a and 50b, and a die 60. The eccentric cam mechanism 20 is a mechanism for converting rotational motion into linear motion of the cutter 30 and clampers 50a and 50b. The cutter 30 contacts the coil wire 10 and strips the insulating coating provided on the surface of the coil wire 10. The base of the cutter 30 is in contact with the movable part of the eccentric cam mechanism 20. The cutter 30 moves upward with the rotation of the eccentric cam mechanism 20. As shown in Figure 1, the cutter 30 is positioned between the eccentric cam mechanism 20 and the die 60. The cutter 30 can repeatedly move towards and away from the die 60 by linear motion.

[0013] The springs 40a and 40b have one end connected to the base of the cutter 30 and the other end connected to the clampers 50a and 50b. Therefore, the springs 40a and 40b and the clampers 50a and 50b move linearly together with the cutter 30. The clampers 50a and 50b are members for holding down the coil wire 10 placed on the die 60. When the springs 40a and 40b are not compressed, i.e., when the clampers 50a and 50b are not touching the die 60, the sides of the clampers 50a and 50b that face the die 60 are on the die 60 side, which is further than the cutting edge of the cutter 30. The die 60 is provided with a recess 61. The recess 61 is provided in the location corresponding to the cutter 30.

[0014] Next, with reference to Figure 2, the operation of the coil wire stripping device 100 when stripping the coil wire 10 will be explained. The angles shown in Figure 2 indicate the rotational phase of the eccentric cam mechanism 20. Note that in Figure 2, a sign is given only when the rotational phase is 0°.

[0015] When the rotational phase is 0°, the cutter 30 and clampers 50a, 50b are furthest from the die 60, creating a gap between the die 60 and the cutter 30 and clampers 50a, 50b. When the eccentric cam mechanism 20 rotates, the cutter 30 is pushed by the eccentric cam mechanism 20, causing the cutter 30 and clampers 50a, 50b to move towards the die 60. In the example shown in Figure 2, when the rotational phase is 55°, the clampers 50a, 50b come into contact with the coil wire 10 and the die 60.

[0016] As the eccentric cam mechanism 20 rotates further, the springs 40a and 40b compress, and with the clampers 50a and 50b pressing against the coil wire 10 and die 60, the cutter 30 moves further towards the die 60. As a result, the insulating coating on the surface of the coil wire 10 is peeled off by the cutter 30. When the rotation phase is 180°, the cutter 30 and clampers 50a and 50b are closest to the die 60.

[0017] Furthermore, as the eccentric cam mechanism 20 rotates, the restoring force of the springs 40a and 40b causes the cutter 30 and clampers 50a and 50b to move away from the die 60. In the example shown in Figure 2, when the rotational phase is 305°, the clampers 50a and 50b move away from the coil wire 10 and the die 60.

[0018] As shown in Figure 2, in the example, stripping is performed only when the rotation phase is between 55 and 305°, and the coil wire 10 is in a waiting state when the rotation phase is between 305 and 55°. Therefore, the coil wire stripping device 100 shortens the cycle time required for stripping the coil wire 10 by performing other tasks when the rotation phase is between 305 and 55°. An example of other tasks is the coil wire feeding operation. Specifically, for example, when the rotation phase is between 305 and 55°, the stripped coil wire 10 is moved from the die 60 and placed at a predetermined location on the next coil wire 10 die 60. By performing the coil wire feeding operation in this way during at least a portion of the rotation phase when stripping is not performed, the cycle time of the coil wire stripping device 100 can be shortened.

[0019] Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit thereof.

Explanation of Reference Numerals

[0020] 100 Coil wire stripping device 10 Coil wire 20 Eccentric cam mechanism 30 Cutter 40a, 40b Springs 50a, 50b Clamps 60 Die 61 Recess

Claims

1. A method for stripping coil wires by moving a cutter using an eccentric cam mechanism that converts rotational motion into linear motion, When the eccentric cam mechanism is in a predetermined rotational phase, the coil wire is stripped off. The eccentric cam mechanism performs other tasks in at least part of the cases where it is not in the predetermined rotational phase. Method for stripping coil wires.

2. The other task is the feeding operation of the coil wire. The method for stripping coil wires according to claim 1.

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