JPS63186546A - Coreless armature coil - Google Patents

Abstract

PURPOSE:To improve manufacturing efficiency, by a method wherein protrusions, having triangular section, are formed on the strand of a coil at the opposing surfaces of an outer tube and an inner tube while the strands are engaged with each other at the end faces of the inner and outer tubes. CONSTITUTION:A coreless armature coil is equipped with an inner tube 21 and an outer tube 22, formed so as to have the shape of tubes by arranging a multitude of strands 20 of the coil in parallel into the circumferential direction of the tubes to engage mutually and twisted into the circonferential direction of the same, as well as an electro-conductive member 253 on which the strands 20 opposing radially to each other are connected at the end faces thereof. The surface of the inner peripheral side of the coil strand 20 of the outer tube 22 and the surface of the outer peripheral side of the coil strand 20 of the inner tube 21 are formed into protrusions 24, 25 having triangular sections respectively while the protrusion 24 of the inner tube 21 is engaged with the protrusion 25 of the outer tube 22 at the end face. According to this method, the positional deviation of the strands 20 of the coil may be prevented surely and the measurement of a positional pattern may become unnecessary.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a coreless armature coil.

[Background technology]

As shown in FIGS. 5 to 11, an inner cylinder 4 and an outer cylinder 6 are formed into a cylindrical shape by a plurality of coil wires l continuous in the circumferential direction, and at least one of them is twisted in the circumferential direction. A conventional ironless armature coil is equipped with a conductive member 14 that connects the radially opposed coil wires 1 and 2 at the end faces of the outer cylinder 6 and the inner cylinder 4, for example, as follows. Manufacture like.

That is, as shown in FIG. 5, a wire sheet 2 formed of zero coil wires 1 arranged in parallel in an insulated state is wound around a mandrel 3 in the same way as a so-called multi-thread screw, and an inner cylinder 4 is formed. Then, the same wire sheet 5 is wound around the inner tube 4 in the opposite direction to the inner tube 4 in a so-called multi-thread shape to form the outer tube 6 (loose coil wires are wrapped around the inner tube in double layers). (It may be wrapped around the tube, or one side of the double tube may be straight). The coil unit 7 is then cut into lengths corresponding to a twist angle of 180 (1±2/n) degrees to form a coil unit 7 as shown in FIGS. 7 and 9. Further, conductive members 14 such as jumper wires are bridged between the radially opposing coil elements vA1 of the outer cylinder 6 and inner cylinder 4 at both ends of the coil unit 7, as shown in FIG. The outer cylinder 6 and the inner cylinder 4 form an electrically closed loop as shown in FIG.
Form the armature coil as shown in the figure. A commutator plate 10 and a shaft 11 as shown in FIG. 8 are fixed to this armature coil, and jumper wires 13 are used to connect predetermined coil wires 1 of the coreless armature coil and commutator segments 12. Form the iron core armature.

However, in this coreless armature, since the coil wire 1 had an oval cross section covered with an insulating member 1a as shown in detail in FIG. When,
The position tends to shift in the circumferential direction as shown by the imaginary line in FIG. This is because the contact surfaces 8 of the coil wires 1 of the outer cylinder 6 and the inner cylinder 4 are curved surfaces, so that they tend to enter the gap between them due to the pressure applied during coil formation. Therefore, when connecting the coil elements vA1 of the outer cylinder 6 and the inner cylinder 4 with the conductive member 14, the position pattern of the coil elements l is measured one by one at the time of connection because the position of the coil element 1 is always unstable. This led to a decline in manufacturing efficiency. Also, if the positions of the coil wires 1 of the inner cylinder 4 and outer cylinder 6 are misaligned, the conductive member 1
This may also cause defects such as layer shorts when connecting 4.

[Purpose of the invention]

An object of the present invention is to provide a coreless armature coil that does not require measurement of position patterns of coil wires on end faces of an inner cylinder and an outer cylinder and can improve manufacturing efficiency.

[Disclosure of the Invention] The ironless core armature coil of the present invention has a plurality of coil wires lined up in the circumferential direction to form a cylindrical shape and fit together, and at least one of the coil wires is twisted in the circumferential direction. a tube, an outer tube, and a conductive member connecting radially opposing ends of each of the coil wires at the end surfaces of the outer tube and the inner tube; and the outer peripheral surface of the coil wire of the inner cylinder each forms a protrusion having a triangular cross section, and the protrusion of the inner cylinder engages between the protrusions of the outer cylinder at the end surfaces of the outer cylinder and the inner cylinder. It is characterized by this.

According to the configuration of the present invention, the projections having a triangular cross section are formed on the opposing surfaces of the outer cylinder and the inner cylinder of the coil wire, and the protrusions are engaged with each other at the end surfaces of the inner cylinder and the outer cylinder. can be reliably prevented. Therefore, it is not necessary to measure the position pattern of the coil wire, and manufacturing efficiency can be improved.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, this iron-free armature coil is formed into a cylindrical shape by arranging a large number of coil wires 20 in the circumferential direction and fitting each other, and an inner cylinder 21 and an outer cylinder, at least one of which is twisted in the circumferential direction. The tube 22 and each of the coil wires 20 are connected to the end surfaces of the outer tube 22 and the inner tube 21.
and a conductive member 23 connecting the radially opposed members, and the inner circumferential surface of the coil wire 20 of the outer cylinder 22 and the outer circumferential surface of the coil wire 2o of the inner tube 21 each have a triangular cross section. The projections 24 and 25 of the inner cylinder 21 are engaged with the projections 25 of the outer cylinder 22 at the end faces of the outer cylinder 22 and the inner cylinder 21.

The coil wire 20 is formed by rolling copper, aluminum, or the like. In this case, the projections 24 and 25 having a triangular cross section are formed by rolling from two or three directions to form a pair of inclined surfaces 24a and 25a as shown in FIG. Also, the surface is made of polyurethane resin or polyester resin! Covered with material.

Further, at the intersection that occurs in the center of the coil wire 2o except for both ends due to displacement of at least one of the outer cylinder 22 and the inner cylinder 21 in the circumferential direction, the protrusions 24 and 25 may be crushed together, Alternatively, it may be left as is without being crushed. In the latter case, the projections 24 engage between the projections 25 only at both ends.

The method of assembling the ironless armature coil is the same as described above.

According to this embodiment, protrusions 24 and 25 having a triangular cross section are formed on the opposing surfaces of the outer cylinder 22 and the inner cylinder 21 of the coil wire 20, and the protrusions 24 and 25 are formed on the end surfaces of the inner cylinder 21 and the outer cylinder 22 (the openings engage with each other). Therefore, displacement of the position of the coil wire 20 can be reliably prevented.Therefore, it is not necessary to measure the position pattern of the coil wire 20, and manufacturing efficiency can be improved.

That is, as shown in FIG. 3, the ends of the coil wire 20 are set so as to be offset from each other by two circumferential directions of the width of the coil cotton 20, and are engaged as shown in FIG. 20 as a whole is displaced in the circumferential direction, but since the slope portions 24a and 25a are in contact with each other, they are stably engaged with each other while being displaced, and the four electric member 14 is also displaced from the slope portion 24a.
, 25d, the connection can be ensured. As a result, there is no variation in the position of the coil wire 20, the position and precision are reproducible, and a stable pattern is obtained, making it possible to perform stable joining without pattern measurement during end face joining. Outer cylinder 2
5 have the same pattern, it is possible to eliminate defects such as layer shorts during bonding, rationalize productivity, and improve coil quality.

〔Effect of the invention〕

According to the ironless armature coil of the present invention, the protrusions having a triangular cross section are formed on the opposing surfaces of the outer cylinder and the inner cylinder of the coil wire, and the protrusions are engaged with each other at the end surfaces of the inner cylinder and the outer cylinder. It is possible to reliably prevent displacement of the position. Therefore, there is an effect that it is not necessary to measure the position pattern of the coil wire, and manufacturing efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram with a partially enlarged portion of an embodiment of the present invention, and FIG. 2 is a partial front view of the end face of the coil. Figure 3 is an exploded view of the inner cylinder and outer cylinder separated, Figure 4 is a cross-sectional view of the coil wire, and Figure 5 is the wire sheet wound around the mandrel during the manufacturing process of the coil unit. FIG. 6 is an explanatory diagram showing the bonding state of the conductive member on the end face of the coil; FIG. 7 is an explanatory diagram illustrating the state in which current flows through the coil; FIG. 8 is a perspective view of the commutator and shaft. , FIG. 9 is a perspective view of a coreless armature, FIG. 10 is an explanatory diagram illustrating the misalignment of the coil wire at the end faces of the inner cylinder and outer cylinder of the conventional example, and FIG. 11 is the coil wire of the conventional example. FIG. 20... Coil wire, 21... Inner tube, 22... Outer tube, 23... Conductive member, 24.25... Protrusion Fig. 1 Fig. 2 Fig. 3 Fig. 5 Fig. 9 Figure 10 Figure 11

Claims (1)

[Claims] An inner cylinder and an outer cylinder, each of which is formed into a cylindrical shape by arranging a large number of coil wires in the circumferential direction and fit together, and at least one of which is twisted in the circumferential direction, and an end face of the outer cylinder and the inner cylinder. and a conductive member connecting the radially opposed coil wires, the inner surface of the coil wire in the outer cylinder and the outer peripheral surface of the coil wire in the inner tube, respectively. A coreless armature coil, characterized in that the protrusion has a triangular cross section, and the protrusion of the inner cylinder engages between the protrusions of the outer cylinder at end faces of the outer cylinder and the inner cylinder.