JPH069570Y2 - Cup-shaped armature coil body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cup-shaped armature coil body, and in particular, a rectangular prototype coil formed by winding a coil wire is provided,
A plurality of phase coils are formed by bending so that the central part of the opposite long sides of this coil is located at one end surface of the imaginary cylinder and both U-shaped free ends of the prototype coil are located at the circumferential surface of the imaginary cylinder. The present invention relates to a cup-shaped armature coil body that is formed by shifting in the column direction.

(B) Conventional Technology As disclosed in Japanese Utility Model Application Laid-Open No. 53-75702, a conventional device of this type has a rectangular prototype coil having a flat opposing short side and a flat opposing long side by winding a coil wire. The center portion of the opposite long sides of this prototype coil is located on one end surface of the imaginary cylinder, and both U-shaped free ends of the prototype coil are bent and formed so as to be located on the circumferential surface of the imaginary cylinder. Forming individual phase coils. The phase coils are displaced in the circumferential direction to form a cup-shaped armature coil body. A perspective view of this coil body is shown in FIG. As is clear from this drawing, each phase coil (a) is formed by bending from a flat prototype coil while maintaining a flat cross section, and between the coil wire and coil end (of each phase coil (a) ( Adjacent phase coil in b) (a)
The connection between (a) is made by once melting the molten layer provided on the surface of the coil wire and then hardening it.

As described above, in the conventional armature coil body, the adjacent coil wire of one coil wire is always the same in the ring shape of the prototype coil because each phase coil is flat aligned winding. It is easy to loosen the wires, especially the phase coil
The mechanical strength at the coil end (b) of (a) is weak.

(C) Purpose of the invention The present invention has been devised in view of the above point, and reduces the unraveling of the coil wire at the coil end of each phase coil and can improve both mechanical strength and productivity. It is intended to provide a shaped armature coil body.

(D) Configuration of the Invention In order to achieve the above object, first, a rectangular prototype coil having a rod-shaped opposing short side and a rod-shaped opposing long side is prepared by winding a coil wire. Form the phase coil by bending so that the central part of the opposite long sides of this prototype coil is located on one end surface of the imaginary cylinder and both free ends of the U-shaped prototype coil are located on the circumferential surface of the imaginary cylinder. To do. When forming the phase coil, the coil side at the U-shaped free end has a flat cross section and the coil end has a twisted portion. A plurality of phase coils thus formed are displaced in the circumferential direction and shaped into a cup shape, and after shaping, heating is performed to fix the coil element wires and the phase coils together to form a cup-shaped armature coil body. To do.

(E) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of the prototype coil. This prototype coil (1) is formed by winding a coil wire consisting of a self-bonding wire,
It is a rectangle having opposite short sides (2) (2) and opposite long sides (3) (3). Each side of this rectangle is rod-shaped, and its AA cross section to DD cross section are substantially semicircles as shown in FIG.

This prototype coil (1) has its opposite long sides (3) (3) center (4),
Specifically, one long side point (E) (E) and the other long side point (F) (F) are located on one end surface of the cylindrical jig (5) and The mold free ends (6) (6) are bent so that they are located on the circumferential surface (7) of the cylindrical jig (5) to form a phase coil. A perspective view of this phase coil (8) is shown in FIG. 5, and a GG sectional view of the central portion (4) and an HH sectional view of the coil side are shown in FIG. 6 (a) (b). As is clear from these drawings, when forming the phase coil (8),
The coil sides (9) and (9) at each U-shaped free end (6) are shown in Fig. 6 (b).
The coil end (10) is formed to have a twisted portion (11) as shown in FIG. The flat shape and the twisted portion (11) are formed by applying a pressing force in the direction of the arrow in FIG. By shifting the plurality of phase coils (8) thus formed in the circumferential direction of the cylindrical jig (5), the coil wires constituting each phase coil (8) are solidified by heating, and The coil ends (10) on which the coils overlap each other are solidified to form the cup-shaped armature coil body shown in FIG. That is, after shaping into a cup shape, the coil strands and phase coils (8) are fixed together, and before shaping, the coil strands are not solidified. It is easy to form the coil end (10) having the portion (11), and by collectively fixing these,
The mechanical strength of the entire cup-shaped armature coil body is also improved.

Although the above is the case where a plurality of phase coils (8) are individually formed, a plurality of phase coils may be formed simultaneously.

That is, as shown in FIG. 8, the central portion (4) of the plurality of prototype coils (1) is supported between the plurality of pins (12) and (13) provided on one end surface of the cylindrical jig (5). The hollow cylindrical body (1
Insert the cylindrical jig (5) into 4) while twisting it slightly. By heating each phase coil (8) in this inserted state, the armature coil body shown in FIG. 7 is formed.

(F) Effects of the Invention As described above, the cup-shaped armature coil body according to the present invention is formed into a cup shape by using a plurality of prototype coils formed by winding the coil element wire consisting of self-bonding wires. A cup-shaped armature coil body in which coil wires and phase coils are fixed to each other by heating in a state, the coil side of the U-shaped free end has a flat cross section, and the coil end has a twisted portion. The following effects can be obtained due to the feature.

(B) Improving productivity by batch fixing after shaping into a cup shape:
After shaping the original coil into a cup shape, the coil wires and the phase coils are fixed together, so that the productivity is high and the cup shape is reliably maintained. For example,
The coil wires forming the coil ends are also collectively fixed with the twisted portion formed. Therefore, without using another reinforcing member, the twisted portion and the fixation after shaping serve as a reinforcing measure, so that the cup-shaped armature coil body has high reliability and the productivity is improved.

(B) Narrow air gap with the stator by adopting coil sides with partially flat cross section: Since the coil sides are thinned, the air gap with the starter is narrowed, improving motor efficiency. be able to. Even in this case,
Other parts such as the crossover part are rod-shaped, and the mechanical strength of that part is kept high, so compared to the cup-shaped armature coil body that has a flat cross section structure, High strength.

(C) Prevention of coil wire unraveling by twisting the coil end:
Since a twisted portion is provided at the coil end, a large number of adjacent coil wires are joined to one coil wire. Therefore,
Since the unraveling of the coil wire is less likely to occur and the mechanical strength is increased, the reliability as a cup-shaped armature coil body is high. In addition, since the twisted portion is provided at the coil end, even before the coil wires are fixed to each other, the coil wires are restrained from each other, and the coil wires are less likely to be unraveled, so that they can be easily fixed together. Is. Here, even if the twisted portion is provided at the coil end, the twisted portion can be easily formed since the coil element wire is fixed between the coil element wires after shaping into a cup shape and the coil element wire has not been solidified until then. .

[Brief description of drawings]

1 and 2 show an armature coil body of a conventional device,
FIG. 1 is a perspective view thereof, and FIG. 2 is a perspective view of a coil end of a phase coil. 3 to 8 show an embodiment of an armature coil body according to the present invention, and FIG. 3 is a perspective view of a prototype coil,
FIG. 4 is a sectional view of the AA to DD section of the prototype coil, FIG. 5 is a perspective view of the phase coil, and FIGS. 6 (a) and (b) are G- of FIG.
G sectional view and HH sectional view, FIG. 7 is a perspective view of an armature coil body, and FIG. 8 is a perspective view of a forming process of a prototype coil. (2) (2) …… Bar-shaped opposite short side, (3) (3) …… Bar-shaped opposite long side,
(1) …… Prototype coil, (4) …… Center part, (5) (5) …… Imaginary cylinder (jig), (6) (6) …… U-shaped free end, (8) …… Phase coil, (9) …… Coil side, (10) …… Coil end, (11) …… Twisted part.

Claims (1)

[Scope of utility model registration request] 1. A rectangular prototype coil, which is formed by winding a coil wire made of a self-bonding wire and has a rod-shaped opposing short side and a rod-shaped opposing long side, and a central portion of the opposing long side of this coil is aerial. A state in which a plurality of phase coils, which are located on one end surface of the cylinder and are bent so that both U-shaped free ends of the original coil are located on the circumferential surface of the imaginary cylinder, are shifted in the circumferential direction to form a cup shape. A cup-shaped armature coil body formed by fixing the coil wires and the phase coils together by heating at
While the coil side of the U-shaped free end has a flat cross section,
A cup-shaped armature coil body characterized in that a coil end has a twisted portion.