JPS60237840A - Manufacture of coil for electric machine - Google Patents

Abstract

PURPOSE:To improve the finishing accuracy of an armature coil while improving the workability by disposing powderlike synthetic resin in a portion required to be secured with a coil formed in the prescribed shape, heating, pressurizing, melting and solidifying it. CONSTITUTION:An insulated conductor is former-wound to form a coil 1 of the prescribed shape, and the coil 1 is temporarily clamped by a temporarily clamping adhesive tape 3. Then, powderlike synthetic resin is disposed on a portion required to be secured with the coil 1. The portion disposed with the resin is heated, pressurized, the resin is melted, solidified and secured with the coil 1. The resin may employ thermoplastic resin or thermosetting resin, and particularly employ preferably synthetic resin which has bood adhesiveness, high glass transition temperature and high heat resistance without deformation after molding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a coil for an electric machine, and particularly to a method for fixing a type-wound coil for, for example, a rotating electric machine.

More specifically, the present invention relates to a method of manufacturing a coil for electric machinery, which comprises, for example, twisting rectangular insulated conductors to form a wound coil, and fixing fixed portions of the coil with synthetic resin.

[Prior art]

Generally, the machine, for example the rotation of the machine's Congkadianyu coil, is the first
As shown in the figure, after winding several to several io rectangular insulated conductors together to form an elliptical coil L, a prepreg sheet or tape 3 for fixing the coil is used to heat certain points. It is pressurized and fixed. This fixed coil was placed in a coil forming machine (not shown), and the fixed portion was held and the ends of the coil were formed (guring) to produce the tortoiseshell-shaped coil shown in Fig. 2. There is.

The coil manufactured in this manner is subjected to insulation treatment as required, and then inserted into the core of an electric machine, for example, a rotating electric machine, connected, and used as an excitation coil.

The rectangular insulated conductor used in the coil is insulated by Nomex winding, glass fiber winding, mica winding, enamel coating, or the like. This insulated conductor is wound into an elliptical shape by a winding machine. This coil is made by placing a prepreg sheet or tape coated with a thermosetting synthetic resin with a large amount of resin on a base material such as glass cloth or fibers in the necessary areas, and attaching the parts that require fixation to the metal parts. The coil is inserted and heated and pressurized to melt and solidify the coil. The purpose of fixing the coil is to prevent the coil from disassembling into pieces during coil molding or coil insulation treatment, which would greatly impair workability.

The prepreg sheets and tapes used for fixing the coils are cut to fit the fixed dimensions of the coil fixation area, manually placed in the required areas, and daped, which requires manual labor. Moreover, the workability is poor, and furthermore, the dimensions of the fixed part of the fixed coil are thickened by the thickness of the prepreg base material, and the dimensional accuracy is poor.Furthermore, the coil end of the fixed coil is If the insulated conductor is fixed during molding (pooling), the insulated conductor may be destroyed, and prepreg material is used to prevent resin from flowing into the coil end. On the other hand, if liquid resin is used, the capillary action will cause the resin to soak into the coil ends, where the coil does not need to be fixed, that is, the coil ends. It's not a good idea to end up destroying it.Again.

Prepreg materials have many drawbacks, such as requiring a long pot life and generally requiring a long hot press time and poor workability.

[Summary of the invention]

The present invention has been made for the purpose of solving the drawbacks of such conventional methods and providing a method for manufacturing coils for electrical machinery that improves workability and finishing accuracy.
To achieve this, powdered synthetic resin is placed in the parts of the coil formed into a predetermined shape that need to be fixed, and this is heated and pressurized to melt and solidify the powdered synthetic resin, improving workability and finishing accuracy. The present invention provides a method for manufacturing a coil for electrical machinery, which allows obtaining a coil for electrical machinery with good quality.

[Embodiments of the invention]

The present invention will be explained below based on one embodiment thereof.

First, insulated conductors are twisted and wound to form a coil of a predetermined shape.Next, a necessary amount of thermofusible powdered synthetic resin is sprinkled on the surface of the part of the coil to be fixed.

Powders of heat-soluble synthetic resins such as ketone, polysulfone nylon, epoxy, and acrylic can all be used. Especially for coil fixation.

A synthetic resin with good adhesiveness is preferable, and a heat-resistant synthetic resin with a high glass transition salinity that does not cause deterioration of the coil even after molding is preferable.

In addition, this powdered synthetic resin is crushed by a crusher,
It is obtained by a method similar to that used for producing powder coatings. Then, the crushed powder is passed through a sieve so that small particles of 20 meshes or less are used, and in particular, powder of 20 to 300 meshes is
Powder containing 0% or more, especially 60~. A 20θ mesh is optimal.

If the size of the powdered synthetic resin exceeds 1.20 mesh, it will not be economically advantageous because it will not be uniformly sprayed or the amount of spraying will be large. Furthermore, if the particles are smaller than 300 mesos, they may become a source of dust and may be difficult to disperse uniformly. In this way, one particle size is 2Q~3θO mesh, especially 60~. The 200 mesh powder is easy to handle and is suitable for improving workability and uniform dispersion. In addition, this powdered synthetic resin is heated and pressurized to be heated and pressurized as described later.

It is preferable that the melt viscosity at °C is λθ0 poise or more. Furthermore, in the case of a powdered synthetic resin reinforced with glass fibers, it is preferable that the glass transition temperature is higher than so'c.

In order to spray the powdered synthetic resin onto the coil formed as described above, the coil is set in a predetermined press mold, and a certain amount of powdered synthetic resin is applied to the required location of the set coil, for example. Spread by automatic spreader. In addition, this powdered synthetic resin can be sprayed on the top or bottom surface of the coil.
Or it may be both sides.

Once the powdered synthetic resin has been spread onto the coil in this way, it is heated and pressurized. It is set appropriately depending on the type of heating synthetic resin.

The coil is fixed in place in this way.

For example, it is molded into a tortoise shell shape using a coil molding machine.

An example in which the method of the present invention is applied to a coil of a rotating electric machine is as follows.In other words, glass fiber is wound on an enameled wire in a 3×5 pot and the enamel is treated with varnish. The insulated conductor is wound by a winding machine in rows G in an elliptical shape as shown in Figure 1 to form a coil L.The coil is then partially covered with polyester adhesive tape 3 to prevent it from unraveling. Temporarily fix the elliptical coil/into a press mold at 720°C, and then
A fast-curing epoxy powder resin of O mesh is spread on a predetermined area and heated and pressurized for about S minutes. Next, the heated and pressurized coil is taken out and sent to a coil mold to form a good hexagonal coil.

〔Effect of the invention〕

Since the method of the present invention is configured as described above, the conventional manual work is abolished, the synthetic resin is also powdered, and it is dispersed by a spreader, and the time for heating and pressurizing is also shortened, resulting in improved workability. This greatly improves Ml, resulting in better mold work, and the placement of the synthetic resin can also be done with better pressure precision due to the powder, making it possible to obtain a method for making electrical coils in the morning with good finish precision in terms of size and shape. It has this effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a circular coil wound with a rectangular conductor, and FIG. 2 is a perspective view of a hexagonal coil after Guhling. /... Coil, co-fist lead part, 3 φ adhesive tape for temporary fixing. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 2

Claims (1)

[Scope of Claims] (1) A step of winding an insulated conductor to form a coil of a predetermined shape, a step of disposing a powdered synthetic resin in a portion of the formed coil that requires fixation, and 1. A method for producing a coil for electrical machinery, comprising the step of melting and solidifying the powdered synthetic resin by heating and pressurizing a portion of the coil where the synthetic resin is fixed. (c) The method for manufacturing an electric coil for an electric machine according to claim 1, wherein the powdered synthetic resin contains 30% or more of powder having a mesh size of 5 grains. (3) Powdered synthetic resin is /! The method for manufacturing a coil for electrical machinery according to claim 1 or 1, wherein the melt viscosity at d'i is 200 voids or more. (Hiroshi) The method for manufacturing a coil for electrical machinery according to any one of claims 1 to 3, wherein the powdered synthetic resin has a glass transition temperature of 503 or higher after heating and pressing. (5) The method for manufacturing an electrical coil according to any one of claims 1 to 9, wherein the powdered synthetic resin is a thermosetting resin. (6) The method for manufacturing an electrical coil according to claim 5, wherein the thermosetting resin is an epoxy resin. (7) The method according to any one of claims 1 to 6, wherein the part on which the powdered synthetic resin is arranged because it requires fixation is at least one of the lower side and the upper side of the formed coil. A method of manufacturing coils for electrical machinery.