JPS5854579B2 - Dendouki Koteishi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method of manufacturing a motor stator that can easily fix and insulate the connection between the stator winding and the Hiji wire.

In a conventional electric motor stator, as shown in the perspective view of FIG. 1 and the cross-sectional view of FIG. After covering it, insulating paper 5 was inserted and tied tightly with thread 6 to fix it to the coil end.Furthermore, the entire stator was treated with varnish for the purpose of moisture proofing and electricity proofing, and was fixed as one piece.

In this process, the number and shape of the weft connections are uneven, so the process is done manually, which poses a manufacturing problem that requires a great deal of labor and man-hours.

Furthermore, in the varnish treatment process, there are problems in terms of odor and pollution due to the long period of time for the varnish to harden and dry, and the volatilization of solvents during drying.

Regarding the above-mentioned varnish treatment, there has been a shift to drip impregnation treatment of solvent-free varnish or powder varnish, and recently, varnish-less production by introducing self-bonding wires has been considered.

However, even if these means are used, although the curing and drying time and the problems of air pollution are improved compared to the conventional means, the problems of fixing and insulating the sunrise wire are not solved.

In other words, when using drip impregnation with solvent-free varnish or powder varnish, uniform performance in terms of impregnation, curing, and adhesion cannot be obtained if insulation treatment such as tubes is applied to the connection part of the Hiji line before the varnish treatment. .

For this reason, at a stage after the varnish treatment, the weft yarns are manually fixed as in the past.

Even when self-fused wires are used, insulating and fixing the connecting portions of the Hiji wire requires the application of weft and varnish, as in the conventional means.

In this way, even with the improvement of the insulation treatment for the windings, the problems related to insulation and fixing of the connection parts of the Hiji Line are not solved, and the workability is actually worsened due to the reprocessing of varnish, etc., and the reduction of manufacturing man-hours. This was a major obstacle to automation.

The present invention solves the above-mentioned problems (preferably in order to apply it to a stator manufactured by drip impregnation with solvent-free varnish, powder varnish treatment, or varnish-less self-fusing electric wire). Considering the simplification of fixing and insulation, the stator is manufactured using a terminal that can perform fixing and insulation at the same time in a single structure, greatly improving the productivity of the stator. The aim is to

Hereinafter, the present invention will be explained in detail with reference to the drawings.

3 to 5 are diagrams for explaining the configuration of an embodiment of the present invention, FIG. 3 is a perspective view showing the configuration of the stator, and FIG. 4 is a perspective view showing the configuration of the stator.
The figure is a sectional view of this lead wire connection section.

FIG. 5 is a completed sectional view of the present invention. In FIGS. 3 to 5, the wire connection portion 3 connects the winding 1 and the lead wire 2 by means of soldering, fusing, or crimp terminals.

The windings are fixed together using drip impregnation treatment with solvent-free varnish, fluidized immersion treatment with powder varnish, or self-fusing wire, and a part of the winding wire is made of a material that can be formed at low pressure. , a terminal structure 8 with a groove 7 is directly injection molded.Furthermore, as shown in FIG. The resin is then injected under pressure again to solidify, and the wire connections are completely encapsulated in the resin, completing insulation and fixing.

Here, the groove 7 of the terminal structure 8 is used to completely insulate the wire connections from each other and between the wire connections and the windings, to make the work of accommodating the wire connections uniform, and to insulate the wires with the hot melt resin that will be injected later. It is effective in making it easier to reinforce the fixation.

In addition, the materials used as low-pressure molding materials and hot melt resins have excellent fluidity when melted, and the melt viscosity at 200°C is 50~50°C.
Melting point of 500 poise viscous liquid: 155°C to 190°C
It is a thermoplastic modified polyester resin that does not damage the insulating enamel of the winding at temperatures close to its melting point (it can be injection molded at low pressure and has a dielectric breakdown voltage of 20
KV/rrvn or more, tensile strength is 80 @/cm
As described above, the strength can be improved by adding a fibrous filler (glass, polyester fiber, etc.).

In the above example, when a modified polyester with 5 phr of glass fiber added was used for the terminal molding, and no filler was added to the resin injected into the groove, the fixing strength of the Hiji Line could withstand 15 hours, compared to the conventional one. The fixation strength by weft and varnish treatment was equal to or higher than that obtained by means of fixation.

This completely insulated and fixed the lead wire connections, and also prevented moisture from entering.

As explained above, the conventional manual work of inserting an insulating tube into the connection section, inserting lead wire insulating paper, weft work, and positioning and dimensional alignment of the tubes is no longer necessary, and the final The insulation treatment for the Hijiden Line simply involves pressurized injection of hot molten resin, and it is possible to automate the fixing and insulation of the Hiji Line without the need for long-term varnish drying.

As is clear from the above description, in the motor stator of the present invention, conventionally, many manual steps such as inserting an insulating tube, inserting insulating paper, and tying threads were still required in the lead wire connection section. Not only does it eliminate the drawbacks associated with insulation and fixing treatments, but instead of varnishing the lead wire connections, which was done for the purpose of moisture proofing and fixing, it is now possible to treat them with hot melt resin for a short period of time, making them self-bonding. The process of using electric wire and solvent-free varnish can be rationalized, and eliminates problems in the manufacturing process such as traditional long drying and reprocessing, and pollution caused by solvents.

Fire problems are significantly reduced, the process can be mechanized and labor-saving, and the effects of shortening the process and reducing the number of man-hours throughout stator manufacturing are extremely significant industrially.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional motor stator, FIG. 2 is a partial sectional view of the same motor stator, and FIG. 3 is a perspective view of a motor stator in an uncompleted state according to an embodiment of the present invention. 4
The figure is a partial sectional view of the electric motor stator before completion, and FIG. 5 is a partial sectional view of the electric motor stator after completion. 1... Winding wire, 2... Lead wire, 3...
...Wiring section, 7...Groove, 8...Terminal structure.

Claims (1)

[Claims] 1. A terminal structure having a groove is directly fixedly formed on a part of the coil end using thermoplastic modified polyester resin, and after inserting the connection part of the winding wire and the Hiji wire into the groove of the terminal structure, 1. A method of manufacturing a motor stator, characterized in that the wire connection portions are insulated and fixed by sealing with molten resin.