JPH0289302A - Coil - Google Patents

Abstract

PURPOSE:To prevent an insulating film from damage while requiring no impregnation treatment besides reducing a wire rod sectional area of a coil for obtaining a cheap coil by closely adhering a holding base to a conductive part for being integrated through an insulating coating or an insulating layer while making the holding base in the shape of an angular cylinder or a cylinder. CONSTITUTION:A conductive part 11 wound about with an electric conductor and an insulating coating 12, a holding base 13 forming a thermal conductor, the external connection terminal parts 14a, 14b each electrifying a coil and an iron core are formed. Accordingly, a problem of damaging the insulating coating 12 of a wire rod due to mechanical stress is gone. Further, since the conductive part 11 is closely and integrally connected to the holding base 13 by the insulating coating 12 or an insulating layer, impregnation treatment by varnish or the like is not necessary. Further, heating of the conductive part 11 by electrification is transmitted to the holding base 13, which is a thermally good conductor, through the insulating coating or the insulating layer for being radiated so that the thermally good conductor of the conductive part 11 saves the sectional area, thus being able to manufacture a cheap coil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coil having electrical inductance and used in reactors, transformers, etc. As shown, it is constructed by winding an insulating coated wire 12 around an insulating spacer 11.

The coil may be used with an air core, but as shown in FIG. 6, an iron core 14 may also be used. The purpose of using insulated wire in the coil is to maintain insulation between the wires.

Problems to be Solved by the Invention In such conventional coils, generally the insulating spacer 11
Since the insulated wire 12 is wound by rotating the insulated wire 12, the insulated wire 12 receives mechanical stress during winding, and the insulated wire 12 is easily damaged. In addition, the assembly process is complicated, as it requires impregnation treatment with phenol to improve fixation and insulation of the coil after winding.

In addition, since the insulating spacer 11 generally has poor thermal conductivity,
Since the heat generated by the current flowing through the coil cannot be sufficiently absorbed and dissipated, it is necessary to increase the cross-sectional area of the insulated wire 12 used in the coil to reduce the heat generated by the coil, which increases the amount of heat generated by the coil. There were problems such as:

The present invention has been made in view of these problems, and has a simple configuration that prevents damage to the insulation coating of the coil due to mechanical stress, eliminates the need for impregnation treatment, and has a wire cross-sectional area of the coil. The purpose is to provide a smaller and cheaper coil.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a current-carrying part in which an electrically good conductor is wound in advance and passes a current through the current-carrying part, and when the current flows through the current-carrying part, A holding base made of a thermally good conductor that absorbs and dissipates generated heat is provided, and an insulation having a thickness that does not impede conduction of heat from the current carrying part to the holding base is provided between the holding base and the current carrying part. The holding base and the current-carrying part are closely integrated with each other via a film or an insulating layer, and the holding base has a rectangular or cylindrical shape.

Function The present invention has the above-mentioned structure (a), in which the pre-wound current-carrying part is tightly integrated with the holding base, which is a good thermal conductor, by means of an insulating coating or an insulating layer, so that, unlike the conventional example, Compared to the method of mechanically winding the wire, there is no problem of damage to the insulating coating of the wire due to mechanical stress.3 Furthermore, the current-carrying part is tightly integrated with the holding base through an insulating coating or an insulating layer. Therefore, there is no need for impregnation treatment with phenol, etc.Furthermore, the heat generated by the current-carrying part due to electricity is transmitted to the holding base, which is a good thermal conductor, through the insulating coating or layer, and is dissipated. Since the cross-sectional area of the electrically conductive conductor in the current-carrying part is small, an inexpensive coil can be manufactured.

Example FIG. 1 shows an embodiment of the coil of the present invention.

In Fig. 1, 1 is a current-carrying part wound with a good electrical conductor;
2 is an insulating coating, 3 is a holding base molded with a good thermal conductor,
4a and 4b each indicate an external connection terminal portion for supplying current to the coil, and 5 indicates an iron core.

FIG. 2 shows an embodiment of the pond of the present invention, and the same numbers as in FIG. 1 have the same names. In FIG. 1, the holding base 3 is formed into a rectangular tube shape, whereas in FIG. 2, it is formed into a cylindrical shape. In this way, the holding base can be formed into any shape depending on the shape of the iron core 5 used.

FIG. 3 shows another embodiment in which one coil is provided with two separate current-carrying parts. The same numbers as in FIG. 2 are the same names. 40 and 4d indicate terminal portions. As in the embodiment shown in FIG. 3, it is also possible to provide one coil with a plurality of current-carrying parts.

FIG. 4 shows an embodiment of a pond according to the present invention, and the same numbers as in FIG. 1 have the same names. Figure 4 shows an insulating coating 2 applied to the outer periphery of the current-carrying part 1, which is devised to prevent poor insulation due to accumulation of dust and dirt on the coil. An example of a specific processing method for the coil of the embodiment will now be described. In the embodiments shown in FIGS. 1 to 3, a copper foil is used as a foil-shaped electrically conductive material, and a sandwich structure of an insulating film and a thermally conductive material is used, like a laminated printed circuit board. It is formed into a cylindrical shape and formed by etching a copper foil to form a current-carrying part which is wound into a coil shape. In the embodiment shown in FIG. 4, the etched copper foil is further coated with an insulating film except for the terminal portions. .

By the way, in the present invention, the coil has been described, but the fifth
As shown in the figure, the present invention can also be applied to a transformer. In FIG. 6, the same numbers as in FIG. 1 are the same names.

Furthermore, the holding base may be provided with irregularities or fins on its surface in order to improve heat dissipation. Furthermore, it is also possible to enhance the heat dissipation effect and increase the current density of the current-carrying part by making the inside of the holding base hollow and placing a cooling gas or a cooling liquid therein.

Note that the coil of the present invention can be applied to either an air core or an iron core.

Effects of the Invention As described above, according to the present invention, it is possible to provide a highly reliable, easy-to-assemble, and inexpensive coil with an extremely simple configuration, which is extremely useful industrially.

[Brief explanation of the drawing]

Figures 1, 2, 31, 4 and 5 show embodiments of the present invention, and Figure 6 shows a conventional example.1 In Figures 1 to 6, a is a cross-sectional view. , b are side views. 1.1'... Current carrying part, 2.2'... Insulating coating, 3゜31,... Holding base, 42L,
4a', 4b, 4b', 4C. 4d...Terminal part, 6...Iron core. Name of agent: Patent attorney Shigetaka Awano and 1 other person) 3
- Amulet Base 14b - 11 Kumiko So 15 - 1 Youkuchi Figure 1 (α) (b)

Claims (8)

[Claims] (1) A holding base is provided, which has a current-carrying part in which a current is passed in which a good electrical conductor is wound in advance, and is made of a good thermal conductor that absorbs and dissipates the heat generated when the current flows through the current-carrying part. , the holding base and the current-carrying part are closely connected through an insulating coating or an insulating layer having a thickness that does not impede conduction of heat from the current-carrying part to the holding base between the holding base and the current-carrying part; A coil characterized in that the holding base is integrated and has a rectangular tube or cylindrical shape. (2) The material of the holding base can be copper, copper alloy, iron, iron alloy,
The coil according to claim 1, characterized in that a metal material such as aluminum or aluminum alloy is used. (3) The coil according to claim 1 or 2, wherein the current-carrying portion has a foil-like shape. (4) The coil according to any one of claims 1 to 3, characterized in that the surface of the holding base is provided with irregularities or fins. (5) Claim 1, characterized in that the holding base is hollow, and cooling gas or cooling liquid is circulated therein.
The coil according to any one of items 1 to 4. (6) An insulating coating is provided on the surface of the current-carrying part, except for the connection part for supplying current from the outside, according to any one of claims 1 to 5. coil. (7) Use a foil-shaped metal plate such as copper foil as a good electrical conductor, create a sandwich structure between an insulating film and a good thermal conductor, and form a current-carrying part in a wound shape by etching the foil-like good electrical conductor. The coil according to any one of claims 1 to 6, characterized in that the coil is formed. (8) The coil according to any one of claims 1 to 6, wherein the current-carrying portion is formed by depositing an electrically good conductor on the surface of an insulating coating or an insulating layer.