JPS58202517A - Electric induction apparatus - Google Patents

Abstract

PURPOSE:To contrive the miniaturization of an electric induction apparatus by reducing the interval between a coil and an iron core by a method wherein an electrostatic plate in which a recess is formed by forming a curved surface part of an approximately oval section having fixed curvatures into an integral body is arranged between the coil and the iron core. CONSTITUTION:The shape of the electro static plate 12 is constituted by a method wherein a flat plate part 121 facing to the coil 1 is provided with the minimum thickness (t) enough to keep the mechanical strength as a structure, both ends are put down vertically to the side of the coil 11, the curved surface part 122 of an approximately oval section having fixed curvatures R1 and R2 is formed into an integral body, and so that the adjacent part 111 of the coil 11 opposed to the electro static plate 12 is made to invade into the recess 123 formed by the flat plate part 121 and the curved surface part 122. The electro static plate 12 is composed of a base material 12a, an electrode 12b, and an insulator layer 12c. The interval A+B+t between the coil 11 and the iron core 3 is reduced by reducing (t).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical induction equipment, and more specifically, to electrical induction equipment such as a transformer in which an electrostatic plate is disposed between a coil and an iron core.

Conventionally, there have been devices of this type as shown in FIGS. In Fig. 7, an electrostatic plate is placed between the coil l and the iron core 3, surrounding the coil l of the transformer. An electrode b is provided by coating the entire circumferential surface of the material core a with metal, and an insulating layer - is coated on the outer surface of the electrode b, and both ends of the electrostatic plate are covered with this. In order to alleviate the electric field at both ends, a curved surface part-2/ having an appropriate curvature was closed. In the illustrated example, the curvature of the curved surface part 1 is a case where the outer R/ and the inner R, +, which are smaller than the kine, continuously form a curved surface, and this curvature R/ * RJ is obtained. The thickness of the electrostatic plate required for this purpose is indicated by T. Then 1 curvature R/ +
By connecting a flat electrostatic plate coil l with the thickness T required to provide RJ, the surge voltage distribution applied to the coil l was improved due to the capacitance between the coil l or the ground. .

However, if the electrostatic plate is disposed at the end of the coil I, facing the iron core 3 or another winding coil.

Electric field concentration is large in the internal and external parts of the electrostatic plate, but electrical breakdown must not occur in those parts.

Since it is necessary to reduce the electric field to an extent that does not cause destruction and allows coordination with other parts, one curvature R,,R, is set sufficiently large. As a result, the thickness T of the electrostatic plate λ is T≧R/
+RJ, and the thickness of the instep was quite large.

Also, the distance between the coil l and the iron core 3 is
The insulation dimension between A.

The insulation dimension between the electrostatic plate and the coil is 10B+
Therefore, the larger the thickness T of the electrostatic plate becomes, the larger the thickness becomes, resulting in a disadvantage that the transformer becomes larger.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and aims to provide a compact electric induction device by reducing the distance between the coil, the iron core, and the throttle. It is something.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. In FIGS. 3 and 7, the shape of the electrostatic plate /2 is such that the flat plate part /, 2/ facing the coil /l has a minimum thickness t sufficient to maintain mechanical strength as a structure. A curved surface part /2- having a predetermined curvature R/, R, and having a predetermined curvature R/, is integrally formed on both sides of the coil 5, and a flat plate part /2-
The concave portion formed by the curved surface portion and the curved surface portion is configured such that the adjacent portion II of the 23VC electrostatic plate and the opposing coil of the 2VC is inserted therein. Adjacent part of coil ///
In order to fit into the recess 23, the width needs to be selected appropriately. The electrostatic plate 12 has a parent phase/2a.

The configuration of the electrode /:lb and the insulator layer /, 2C is the same as the conventional one.

With the above configuration, the function of the electrostatic plate /- is the same as before, but the distance A + B + t between the coil l / and the iron core 3 is
This is reduced by making t smaller.

As a result, electrical induction devices such as transformers can be made smaller.

Note that the electrostatic plate 1 of the above embodiment can be manufactured, for example, by the following method. That is, a base material /2a consisting of a flat plate part 7271 and a curved surface part /22 is sprayed with molten metal particles to form an electrode /:lb, a wet paper-like breath board is closely attached to the outer surface of the base material /2a, and an insulating layer /22 is formed. form λC.

FIG. 5 shows another embodiment, in which a flat base material 2.2a is wrapped with metal foil and provided with an electrode λb, and a base material 2.2a with an egg-shaped cross section is similarly wrapped with metal foil and provided with an electrode 22b. The curved surface portion 2.2.2 made of the shaped base material 22a1 is integrally bonded with a conductive adhesive, and an insulating layer such as a press board is formed on the entire outer periphery.
By providing the 2ν group, the flat plate portion 4. ! / and the curved surface part C, 2- form a concave part, and 2 and 3 form a similar effect.

As is clear from the above description, the present invention can achieve miniaturization of equipment by effectively utilizing the space within the core with a simple configuration. .

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the main part of the conventional plate, Fig. 1 is a cross-sectional view of the electrostatic plate, Fig. 3 is a schematic diagram of the main part of an embodiment of the present invention, and Fig. 9 is of the same electrostatic plate. A cross-sectional view, FIG. S is a cross-sectional view of an electrostatic plate of another embodiment. //...Coil, ///...Adjacent part, lλ. 2.2... Electrostatic plate, /2/, :l:t/... Flat plate part, /
22. :122...Curved surface part, L23. λ3...concavity,
/2a, J2a, 22a7 - Base metal, /Jb. 2'2b,,2Jb,--deng-#2c,,12c
... Insulator layer, 3. Iron core. Note that in Figure 1, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno −

Claims (1)

[Claims] In an electric induction device in which an electrostatic plate is arranged between an iron core and a coil, a flat plate part and a curved part having a predetermined curvature in cross section that hangs toward the coil are integrated on both sides of the flat plate part. An electric induction device comprising: the electrostatic plate having a recess formed therein; and the coil, the coil having an adjacent portion facing the electrostatic plate inserted into the recess.