JPS5961453A - Manufacture of coil unit for coreless armature - Google Patents

Abstract

PURPOSE:To effectively execute a welding work by forming a coupler in a bimetal structure, and emitting a laser light to weld, thereby pressing the coupler to the end surface of the coil strands. CONSTITUTION:A coupler 32 has a bimetal structure, the surface having small thermal expansion coefficiency is superposed on the end surface of the coil strands 1 and bridged between the inner cylindrical coil 11 and the outer cylindrical coil 12. A laser light 34 is emitted to both ends of the coupler 32 in the state that the upper surface of the coupler 32 is retained by a jig 61. The coupler 32 is molten by the laser light 34 and welded to the end face of the coil strands 1. Since the coupler 32 has the bimetal structure, the both ends are effectively pressed to the end face of the coil strands 1 without floating from the end face of the strands 32.

Description

[Detailed Description of the Invention] This invention is based on FIGS. As shown in Figure J2, an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted and combined,
The present invention relates to a method for manufacturing a coil unit of an ironless core type armature in which the curved portions are successively joined to form an electrically closed loop, and an object of the present invention is to provide a method for manufacturing a coil unit in which overlapping portions can be easily joined.

In addition, in order for the coil wires 1 of the inner cylindrical coil 11 and the outer circular 1y7i coil 12 to form one continuous electrically closed loop as described above, it is necessary to satisfy, for example, the following conditions. be.

That is, the coil wires 1 forming the inner cylindrical coil 1 and the outer cylindrical coil 12 are both made of the same number and are arranged in parallel on the cylindrical surface without overlapping, and the inner cylindrical coil 11 and the outer cylindrical coil 12 are When fitting, it is necessary that each coil wire 1 of the outer cylindrical coil 12 overlaps with each coil wire 1 of the inner cylindrical coil 11 in the radial direction at each end.

When the coil wire 1 is twisted in opposite directions to form the inner cylindrical coil 11 and the outer cylindrical coil 12, and when these are combined and fitted, the coil wire 1 of the inner cylindrical coil 11 is The coil wires 1 of the cylindrical coil 12 are not arranged point-symmetrically, but are fitted so that the coil wires 1 are shifted by one length at one end.

Conventionally, in order to join the coil wires 1 that overlap in the radial direction of the inner cylindrical coil 11 and the outer cylindrical coil 12, as shown in FIG. This is done by irradiating the laser beam 34 and melting and joining.

At this time, the center portion of the bonding material 32 is held down with a jig 61 so that it does not rise above the surface of the coil wire 1, and both ends thereof are irradiated with the laser beam 34. At this time, the reason why the two ends of the auxiliary material 32 to be welded to the coil wire 1 are not held down is because the laser beam 34 may be blocked by the jig 61 or the jig 6 may be melted and welded to the coil wire 1. This is to prevent

However, when the coil wires 1 are melted in this way and the coil wires 1 that overlap in the radial direction are joined, the ends of the joint portions 32 remain raised as shown in FIG. 4 and are not welded to the coil wires 1. There was a drawback that there was.

This invention aims to eliminate the above-mentioned drawbacks, and its gist is to fit an inner cylindrical coil 11 and an outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel. and put a bonding material 32 in the overlapping part.
In the method of manufacturing a coil unit in which the bonding material 32 is formed into a bimetallic structure by being sequentially joined together to form an electrically closed loop, the bonding material 32 is formed into a bimetallic structure, and the surface with a small coefficient of thermal expansion is brought into contact with the coil wire 1, and then , an iron-core type armature coil unit characterized in that a laser beam 34 is irradiated on a surface having a large coefficient of thermal expansion.

The present invention will be described below based on an illustrative embodiment.

An embodiment of the present invention is shown in FIGS. 5 to 9.

First, the inner cylindrical coil 11 and the outer cylindrical coil 12 formed by coil wires 1 of equal length arranged in parallel are fitted together so that the coil wires 1 overlap in the radial direction.

A bonding material 32 formed into a bimetallic structure is spread over the coil wires 1 that overlap in the radial direction.

As shown in FIGS. 6 and 7, the bonding material 32 has a bimetallic structure in which upper and lower layers of dissimilar metals are bonded together.

The 41-layer structure of the binding material 32 having a bimetal structure is formed from a combination of aluminum and copper, a button and tin, a combination of copper and iron, and the like.

The surface of the bonding material 32 with a small coefficient of thermal expansion is placed at the end of the coil wire 1 (together, it is extended between the inner cylindrical coil 1 and the outer cylindrical coil 12. In this way, the surface of the bonding material 32 with a small coefficient of thermal expansion is The large surface faces outward from the upper surface, and is held down on the upper surface by a jig 61 to prevent it from lifting up.

After doing so, both ends of the bonding material 32 are irradiated with a laser beam 34. The bonding material 32 is melted by being irradiated with the laser beam 34 and is welded to the end face of the coil wire l.

At this time, since the upper surface of the bonding material 32 is made of a material with a large coefficient of thermal expansion, it absorbs the energy of the laser beam 34, causing deformation in which both ends are curved toward the lower surface. Thus, both ends of the bonding material 32 do not rise above the end surface of the coil wire 1, but rather come into pressure contact with the end surface of the coil wire 1, so that welding can be reliably performed.

In this way, as shown in FIG. 5, the coil wires 1 overlap in the radial direction of the inner cylindrical coil 11 and the outer cylindrical coil 12 at the end faces of the inner cylindrical coil 11 and the outer cylindrical coil 12.
By applying the bonding material 32 in between, the bonding can be easily and reliably performed.

As described above, according to the present invention, the ends of the bonding material 32 spread between the coil wires 1 can be pressed against the end surface of the coil wires 1 during irradiation welding with the laser beam 34, causing behavior, so that welding is not possible. It can be done with certainty.

A commutator 17 and a shaft 18 are fixed to this coil unit 16 as shown in FIG. 8 to obtain a coreless armature. FIG. 9 is an enlarged perspective view of section A in FIG. 8, in which the coil wire 1 and the commutator segment 19 are connected with solder 20.

[Brief explanation of the drawing]

1 to 4 are diagrams showing a conventional example of the present invention, in which FIGS. 1 and 2 are perspective views, FIGS. 3 and 4 are sectional views of main parts, and FIGS. 5 to 4. @ Figure 9 shows an embodiment of the present invention. Figure 5 is a perspective view of the main part, Figures 6 and 7 are sectional views of the main part, and Figure 8 is a perspective view. Figure 9 is the 8th
It is a perspective view of the A part of a figure. Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others) t11 2nd;・: Figure 3 Iwa 4j・・1 '5p+ 2

Claims (1)

[Claims] 1) The inner cylindrical coil 11 and the outer cylindrical coil 12 formed by the coil wires 1 of equal length distributed in parallel Fc are fitted and combined, and the overlapping portion is spread with a bonding material 32 and sequentially joined. In the method for manufacturing a coil unit that forms an electrically closed loop, the binding material 32 is formed into a bimetallic shape, and the surface with a low coefficient of thermal expansion is brought into contact with the coil wire 1, and then the surface with a high coefficient of thermal expansion is brought into contact with the coil wire 1. A method for manufacturing a 'JItS iron core type armature coil unit, which is characterized by irradiating the surface with a laser beam 34.