JP2017112728A - Stator manufacturing method - Google Patents

Abstract

Provided is a technique for avoiding an end portion of a final coil from interfering with other coils when the final coil is mounted on a tooth. A robot is provided with a plurality of coils 3 formed of a rectangular wire wound in a substantially rectangular shape on a plurality of teeth 5 projecting inward in the radial direction of the stator core 2 from an inner peripheral surface 4a of an annular stator core 2. The manufacturing method of the stator 1 that is sequentially mounted by the hand 6 includes: (1) a second coil 3B (final coil) that is the coil 3 to be mounted last among the plurality of coils 3 by the jig 14 attached to the robot hand 6; The step (S100) of attaching the second coil 3B to the second tooth 5B in a state where the end portion 8B protruding in the circumferential direction of the stator core 2 is elastically deformed in advance radially outward of the stator core 2; 2) After the second coil 3B is mounted on the second tooth 5B, the step of elastically restoring the end 8B of the second coil 3B by separating the jig 14 from the second coil 3B (S110). , Including the. [Selection] Figure 3

Description

  The present invention relates to a method for manufacturing a stator.

  Patent Document 1 discloses a technique in which a coil made of a rectangular wire with insulating coating wound in a substantially rectangular shape is mounted on each of a plurality of teeth formed on the inner peripheral surface of an annular stator core. .

JP 2014-230293 A

  When a plurality of coils composed of rectangular wires wound in a substantially rectangular shape are sequentially attached to a plurality of teeth projecting inward in the radial direction of the stator core from the inner peripheral surface of the annular stator core, There is a problem in that the end of the final coil, which is the last coil to be mounted among the coils, interferes with other coils.

  An object of the present invention is to provide a technique for avoiding an end portion of a final coil from interfering with another coil when the final coil is attached to a tooth.

  According to an aspect of the present invention, a robot hand is provided with a plurality of coils each formed of a rectangular wire wound in a substantially rectangular shape on a plurality of teeth protruding inward in the radial direction of the stator core from the inner peripheral surface of an annular stator core. The stator is sequentially attached by the method described above, and the end of the stator coil protruding in the circumferential direction of the final coil, which is the coil to be finally attached among the plurality of coils, by a jig attached to the robot hand. A step of attaching the final coil to the teeth in a state where the portion is elastically deformed outward in the radial direction of the stator core; and, after attaching the final coil to the teeth, the jig is separated from the final coil. Thus, there is provided a method for manufacturing a stator, including the step of elastically returning the end portion of the final coil. According to the above method, when the final coil is attached to the teeth, it is possible to avoid the end of the final coil from interfering with other coils.

  According to the present invention, when the final coil is attached to the teeth, it is possible to avoid the end of the final coil from interfering with other coils.

It is a top view of a stator. It is a perspective view of the robot hand holding the coil. It is a top view of a stator, Comprising: It is a figure for demonstrating the problem at the time of mounting | wearing. It is a flowchart of the manufacturing method of a stator.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a plan view of a stator 1 for a three-phase induction motor. As shown in FIG. 1, the stator 1 includes an annular stator core 2 and a plurality of coils 3.

  The annular stator core 2 is composed of a plurality of laminated electromagnetic steel plates. The annular stator core 2 includes an annular stator core main body 4 and a plurality of teeth 5 protruding from the inner peripheral surface 4 a of the stator core main body 4 inward in the radial direction of the stator core 2.

  Each coil 3 is formed by winding a rectangular wire Z with an insulating coating in a substantially rectangular shape. The insulating coating is, for example, enamel. The conducting wire is, for example, copper or a copper alloy. Each coil 3 is wound around each tooth 5 in a concentrated manner. That is, the stator 1 of this embodiment is a concentrated winding stator.

  Hereinafter, for convenience of explanation, the three coils 3 shown in FIG. 1 are referred to as a first coil 3A, a second coil 3B, and a third coil 3C in a clockwise direction. Similarly, the tooth 5 to which the first coil 3A is attached is the first tooth 5A, the tooth 5 to which the second coil 3B is attached is the second tooth 5B, and the tooth 5 to which the third coil 3C is attached is the third tooth 5C. Called.

  The first coil 3A is, for example, the W phase, the second coil 3B is, for example, the V phase, and the third coil 3C is, for example, the U phase.

  The coils 3 are sequentially attached to the teeth 5 by the robot hand 6 shown in FIG. The robot hand 6 has a coil holding portion 7 that holds the coil 3 wound in a substantially rectangular shape.

  The robot hand 6 attaches the coils 3 shown in FIG. 1 to the teeth 5 sequentially in the clockwise direction. Specifically, the robot hand 6 first attaches the third coil 3C to the third tooth 5C, and then attaches the coil 3 to the tooth 5 arranged clockwise as viewed from the third tooth 5C. ..., the first coil 3A is attached to the first tooth 5A, and finally the second coil 3B is attached to the second tooth 5B. The second coil 3 </ b> B is a final coil that is finally attached to the tooth 5 among the plurality of coils 3.

  Next, the neutral point M of the stator 1 will be described with reference to FIG.

  As shown in the plan view of FIG. 1, in the stator 1 of the present embodiment, the plurality of coils 3 are connected to each other by star connection. That is, at the neutral point M, the end portion 8B of the second coil 3B that is the V phase, the end portion 8C of the third coil 3C that is the U phase, and the end portion 8D of the coil 3 that is the W phase are aligned. Are lined up. The end 8B and the end 8C, and the end 8C and the end 8D are substantially in surface contact. The end 8B, the end 8C, and the end 8D are electrically connected to each other by welding in a later process.

  Here, a line in which the end 8B, the end 8C, and the end 8D are arranged is defined as an end alignment line 9. The end alignment line 9 extends so as to approach the root 10 of the second tooth 5B from the end 8D toward the end 8C and the end 8B. In other words, the angle θ formed by the longitudinal direction 11 of the second tooth 5B and the end alignment line 9 is less than 90 degrees. The longitudinal direction 11 and the end alignment line 9 intersect at an acute angle. More specifically, an intersection point P between the longitudinal direction 11 and the end alignment line 9, an arbitrary point Q radially inward of the stator core 2 from the intersection point P in the longitudinal direction 11, and a neutral point M are formed. MPQ is less than 90 degrees. The neutral point M is located on the third coil 3C. That is, the end 8B protrudes from the second coil 3B in the circumferential direction of the stator core 2.

  Further, the rectangular wire Z constituting the second coil 3B has a first bent portion 12 that is bent so as to protrude inward in the radial direction of the stator core 2 at the innermost side in the radial direction of the stator core 2, and the stator core. 2 and a second bent portion 13 that is bent so as to be convex outward in the radial direction. The rectangular wire Z constituting the second coil 3B extends along the end alignment line 9 between the second bent portion 13 and the end portion 8B. The end portion 8B extends along the axial direction of the stator core 2. Similarly, the end portion 8C and the end portion 8D extend along the axial direction of the stator core 2.

  With the above configuration, when each coil 3 is attached to each tooth 5 and finally the second coil 3B is attached to the second tooth 5B, as shown in FIG. 3, the end 8B of the second coil 3B is provided. Will physically interfere with the end 8C of the third coil 3C. Therefore, in the present embodiment, as shown in FIG. 2, the end portion 8B of the second coil 3B is elastically deformed in advance radially outward of the stator core 2 by the jig 14 attached to the coil holding portion 7 of the robot hand 6. In this state, the second coil 3B is attached to the second tooth 5B (see S100 in FIG. 4). The jig 14 has a convex shape outwardly in the radial direction of the stator core 2 so as to come into surface contact with the rectangular wire Z having the first bent portion 12 and the second bent portion 13 in the radial direction of the stator core 2. ing. When the end portion 8B of the second coil 3B is elastically deformed radially outward of the stator core 2, the end portion 8B is elastically displaced in a direction away from the end portion 8C of the third coil 3C. Can be avoided.

  Then, after the second coil 3B is mounted on the second tooth 5B, the jig 14 of the coil holding part 7 of the robot hand 6 is separated from the second coil 3B, so that the second tooth 5B of the second coil 3B is elastically restored. Therefore, as shown in FIG. 1, the end portion 8B forms an end alignment line 9 along with the end portion 8C and the end portion 8D, and forms an end alignment line 9 as shown in FIG. Substantially surface contact.

  As mentioned above, although preferred embodiment of this invention was described, the said embodiment has the following characteristics.

  A plurality of coils 3 composed of rectangular wires Z wound in a substantially rectangular shape are sequentially applied by a robot hand 6 to a plurality of teeth 5 protruding radially inward of the stator core 2 from an inner peripheral surface 4a of the annular stator core 2. The manufacturing method of the stator 1 to be mounted is as follows: (1) The stator core 2 of the second coil 3B (final coil) which is the coil 3 to be mounted last among the plurality of coils 3 by the jig 14 attached to the robot hand 6. A step (S100) of attaching the second coil 3B to the second tooth 5B in a state in which the end portion 8B protruding in the circumferential direction is elastically deformed in advance radially outward of the stator core 2; After the coil 3B is mounted on the second tooth 5B, the jig 14 is separated from the second coil 3B, thereby elastically returning the end 8B of the second coil 3B (S110). According to the above method, it is possible to avoid the end 8B of the second coil 3B from interfering with the other coils 3 when the second coil 3B is attached to the second tooth 5B.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator core 3 Coil 3A 1st coil 3B 2nd coil 3C 3rd coil 4 Stator core main body 4a Inner peripheral surface 5 Teeth 5A 1st teeth 5B 2nd teeth 5C 3rd teeth 6 Robot hand 7 Coil holding part 8B End part 8C End portion 8D End portion 9 End portion alignment line 10 Root 11 Longitudinal direction 12 First bent portion 13 Second bent portion 14 Jig M Neutral point P Intersection Q Point Z Rectangular wire θ Angle

Claims (1)

A stator of a stator in which a plurality of coils composed of rectangular wires wound in a substantially rectangular shape are sequentially mounted by a robot hand on a plurality of teeth protruding inward in the radial direction of the stator core from the inner circumferential surface of an annular stator core. A manufacturing method comprising:
By means of a jig attached to the robot hand, the end portion of the last coil, which is the last coil to be mounted among the plurality of coils, projecting in the circumferential direction of the stator core is elastically deformed in advance radially outward of the stator core. Attaching the final coil to the teeth in a state where
After the final coil is mounted on the teeth, the jig is separated from the final coil to elastically return the end of the final coil;
including,
Stator manufacturing method.

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