JPS6379308A - Manufacture of coil - Google Patents

Abstract

PURPOSE:To eliminate adjusting work for external circumference of coil by thermally hardening a metal plate loaded to the external circumference of insulation base material arranged to the external circumference of coil and easily obtaining a coil having the smooth external circumference. CONSTITUTION:A metal plate 7 is loaded to the external circumference of a circumferential taping layer 5 and a fixing tape 8 is wound circumferentially. Thereafter, it is fixed. The entire part is thermally hardened for the determined time at the determined temperature. Resin flowing from prepreg-processed insulation base material or tape uniformly impregnates into the external circumferential surface of coil along the surface of metal plate 7. Thereby, adjustment by resin at the recessed and projected regions is carried out when a coil is wound, forming smooth external circumference. After the thermal hardending, the metal plate 7 and fixing tape 8 are removed from the coil, completing a coil. Accordingly, a coil having smooth external circumference can be obtained and adjustment work for external circumference of coil can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a coil, particularly a method for manufacturing a coil for a molded transformer.

[Conventional technology]

FIG. 3 is a partially cutaway perspective view showing a conventional method for manufacturing a coil of a molded transformer. In the figure, (1) is a coil conductor, (2) is a coil core made of glass fiber-reinforced epoxy resin, etc., around which the coil conductor is wound, and (3) is a coil core placed between the layers of the coil conductor (1). Interlayer insulation base material treated with prepreg (insulation base material impregnated with resin and treated to a semi-cured state (B stage)), (4) is an outer peripheral insulation base treated with prepreg placed on the outer periphery of the coil conductor (1) material, (5) is a peripheral taping layer using a woven fabric tape prepreg such as polyester fiber (Tetron) or glass fiber wrapped from the outside of this peripheral insulating base material, (
6) is a coil end collar made of a prepreg-treated insulating base material, glass fiber lobe prepreg, or the like, disposed at the end of the coil conductor (1).

In the conventional coil manufacturing method, the coil conductor (
A resin-impregnated (molded) coil is manufactured by winding 1) around a winding core (2), further winding an outer insulating base material (4) and an outer circumferential taping layer (5) around the outer periphery, and heating and curing in that state. do.

[Problem that the invention seeks to solve]

Since the conventional coil manufacturing method is configured as described above, the outer circumferential surface of the coil obtained after heat curing is not smooth due to unevenness due to resin flow, foaming, and unevenness of the coil finish m. However, in order to obtain a coil with a smooth surface, adjustment work on the coil surface is required after heating and curing, resulting in poor workability and productivity.

This invention was made to solve the above-mentioned problems, and provides a method for manufacturing a coil that can form a smooth outer circumferential surface of the coil during heat curing treatment and improve workability and productivity. The purpose is to

[Means for solving problems]

The method for manufacturing a coil according to the present invention is to place an insulating base material impregnated with resin and made into a semi-hardened state around the outer periphery of a coil formed by winding a coil conductor, and then heat-cure by attaching a metal plate to the outer periphery of the insulating base material. It was designed to do so.

[For production]

In the method for manufacturing a coil of the present invention, a prepreg-treated insulating base material is arranged on the outer peripheral surface of a coil wound using a prepreg-treated insulating base material, and a thin metal plate (for example, an aluminum Pi!lI ) is attached and heat-cured, and after heat-curing, this metal plate is removed and the outer peripheral surface of the coil is smoothed.

At this time, the thin metal plate attached to the outer circumferential surface uniformly impregnates the outer circumferential surface of the coil with the resin flowing out from the prepreg insulating base material during heat curing, thereby forming a smooth outer circumferential surface.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a state before heat curing in a method for manufacturing a coil for a molded transformer according to an embodiment of the present invention, and FIG. 2 is a sectional view of a portion thereof. , the same symbols as in FIG. 3 indicate the same or corresponding parts. (7) is a thin metal plate such as an aluminum plate attached to the outer circumferential surface of the outer circumferential taping layer (5), which has been subjected to mold release treatment in advance. (8) is a fixing tape wound to fix this metal plate to the coil.

The method of manufacturing the coil is to form the coil in the same manner as before, then attach a metal plate (7) to the outer periphery of the outer circumferential taping layer (5), and then wrap the fixing tape (8) around the outer periphery to fix it. . By heating and curing at a predetermined temperature for a predetermined time, the resin flowing out from the prepreg-treated insulating base material, tape, etc. is uniformly impregnated into the outer peripheral surface of the coil along the surface of the metal plate (7). As a result, the uneven portions are adjusted with the resin at the same time as the coil is wound, and a smooth outer circumferential surface is formed. After heating and curing, the metal plate (7) and the fixing tape (8) are removed from the coil to obtain a coil.6 Note that in the above example, the outer insulating base material (4) and the outer circumferential taping layer (5) are provided separately. However, one may be omitted. Furthermore, although the above embodiments relate to coils of molded transformers, they can also be applied to other coils.

〔Effect of the invention〕

As described above, according to the present invention, a metal plate is attached to the outer periphery of the insulating base material arranged around the outer periphery of the coil, and the metal plate is heated and hardened, so that a coil having a smooth outer periphery can be easily and inexpensively produced. In addition, there is an effect that work such as adjustment of the outer circumferential surface of the coil becomes unnecessary, resulting in a coil with high workability and productivity.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a partially cutaway perspective view showing a conventional manufacturing method. . In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is the coil conductor, (2) is the winding core, (4) is the outer insulating base material,
(5) is an outer peripheral taping layer, (7) is a metal plate, and (8) is a fixing tape.

Claims (3)

[Claims] (1) On the outer periphery of the coil formed by winding the coil conductor,
A method for manufacturing a coil, which comprises disposing an insulating base material impregnated with a resin to a semi-hardened state, attaching a metal plate to the outer periphery of the insulating base material, and heating and hardening the base material. (2) The method for manufacturing a coil according to claim 1, wherein the metal plate is an aluminum foil. (3) A method for manufacturing a coil according to claim 1 or 2, wherein a fixing tape is wound around the outer periphery of the metal plate.