JPH0583936U - Insulated wire - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an insulated electric wire having excellent high-frequency voltage characteristics, which is useful as a high-frequency electric wire such as a high-frequency transformer and a CRT deflection yoke coil. The present invention relates to an insulated wire in which a coating layer 2 containing a conductivity-imparting material is applied directly on a conductor 1 and an insulation coating layer 3 is baked on the coating layer 2, and the coating layer 2 containing the conductivity-imparting material is provided. Suppresses the adverse effects of residual metal powder, smoothes the boundary with the insulation coating layer, and achieves good adhesion between the conductor and insulation coating layer, resulting in long life and excellent high-frequency voltage characteristics. Be done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency insulated wire such as a high frequency transformer and a CRT deflection yoke coil, and more particularly to an insulated wire having improved high frequency voltage characteristics.

[0002]

[Prior Art]

 Recently, in CRT computer displays, monitor TVs, etc., the resolution of images has been improved. In this CRT, an insulated electric wire such as an enameled wire is used for the deflection yoke coil portion and is operated by a high frequency signal. At present, it may be used at a high frequency of around 100 KHz.

[0003]

[Problems to be solved by the device]

 However, the withstand voltage of the enamel wire tends to decrease with increasing frequency, so if the same enamel wire as the conventional one was used as the insulated wire for the part where the high-frequency signal is handled, There was a problem that the life of enamel wire could not be reduced due to the handling of signals.

On the other hand, there is a litz wire in which a plurality of strands are twisted together for high frequency. Although this has the effect of suppressing resistance increase and eddy current loss heat generation due to the skin effect due to high frequency, the coating film It was almost the same as the enamel wire in that the withstand voltage was decreased.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of such a conventional situation, and is characterized in that in an insulated wire in which an insulating coating layer is baked on a conductor, a coating containing a conductive material is provided directly on the conductor. Insulated wire with layers.

[0006]

[Action]

 By introducing the coating layer containing the conductivity-imparting material, an insulated wire excellent in high-frequency withstand voltage characteristics can be obtained without lowering its life even when used at high frequencies.

[0007]

【Example】

 An insulated wire according to the present invention is illustrated below. As shown in FIG. 1, 1 is a conductor, 2 is a coating layer containing a conductivity-imparting material provided directly on the conductor 1, and 3 is this conductivity-imparting material. It is an insulating coating layer provided and baked on the coating layer 2 including.

As the conductivity-imparting material of the coating layer containing the conductivity-imparting material, conductive carbon is preferable, and in addition, metal filler and the like can be mentioned. These conductivity-imparting materials are mixed with polyurethane, epoxy, polyester, polyamide, polyimide, polyamide-imide, and other resin materials similar to conventional enamel wires as a base resin.

In the case of conductive carbon, the mixing ratio is preferably 10 to 30 wt% (weight%) with respect to the resin content. If it is less than 10 wt%, the effect of improving the withstand voltage characteristic described below cannot be obtained, and if it exceeds 30 wt%, not only the effect of improving the withstand voltage characteristic further cannot be expected, but also unevenness due to carbon on the coating surface can be expected. This is because the mechanical strength and the electrical characteristics are deteriorated. Further, in this mixing, the particle diameter of the conductive carbon is preferably about 20 to 50 nm so that it can be easily dispersed in the base resin.

In order to apply the coating layer containing such a conductivity-imparting material directly on the conductor, it may be provided by dissolving it in a suitable solvent and baking it like a varnish or extruding.

On the coating layer containing this conductivity-imparting material, in addition to varnish, polyurethane, polyamide, polyester, polyamide-imide, and other materials similar to conventional enameled wires are used and coated as an insulating coating layer. It At this time, the combination of the coating layer with the base resin may be appropriately selected in consideration of manufacturing conditions, required characteristics and the like.

It is presumed that the formation of such a coating layer containing the conductivity-imparting material improves the high-frequency withstand voltage characteristic for the following reason. In other words, the cause of the decrease in withstand voltage has not been clearly specified, but one of the causes is that the metal powder (copper powder or aluminum powder) usually generated during wire drawing of the conductor is used as the base of the enameled wire. It is conceivable that powder etc. adheres and remains, and if there is such residual metal powder, electric field concentration is likely to occur, and as a result, the withstand voltage will decrease. In particular, at commercial frequencies or at frequencies of ordinary consumer TVs (17.5 KHz), the effect will not be a problem, but as the frequency becomes higher, the effect becomes greater and the withstand voltage characteristics deteriorate. Can be seen. Based on this reasoning, in the present invention, the coating layer containing the conductivity-imparting material covers the conductor immediately above, so that the influence of residual metal powder and the like is suppressed and the boundary with the insulating coating layer becomes smooth, so that the electric field is reduced. This is because concentration is unlikely to occur, and the interposition of this coating layer improves the adhesion between the conductor and the insulating coating layer, and thus excellent high-frequency withstand voltage characteristics can be obtained.

Incidentally, the insulated electric wires according to the present invention (Examples 1 to 5) shown in Table 1 and the conventional ordinary insulated electric wires (Comparative Example 1) without the coating layer containing the conductivity enhancer or the present invention. When insulated wires (Comparative Examples 2 to 3) lacking the conditions were prepared and subjected to a 90 KHz high frequency pulse destruction test, the results shown in the same table were obtained. As the test electric wire, a copper wire having a conductor diameter of 0.2 mm was prepared, and in the copper wire arbor, in Examples 1 to 5 and Comparative Examples 2 to 3 of the present invention, a coating layer containing a conductivity-imparting material having a thickness of 5 nm was used. It was prepared by providing an insulating coating layer of 20 nm, and in the conventional comparative example 1, it was prepared by providing only an insulating coating layer of 25 nm.

In the high frequency pulse breakdown test, two twisted samples were prepared for each of the sample insulated wires (Examples 1 to 5 and Comparative Examples 1 to 3), and continuous boosting voltage was applied to break the sample. It was measured by voltage (KV).

[0015]

[Table 1]

From Table 1, in the case of the insulated wires according to the present invention (Examples 1 to 5), the conventional insulated wires (Comparative Example 1) and the insulated wires lacking the conditions of the present invention (Comparative Examples 2 to 3) are shown. By comparison, it can be seen that a high breakdown voltage is obtained and a long wire life and excellent high-frequency withstand voltage characteristics are achieved.

[0017]

[Effect of the device]

 As is clear from the above description, according to the present invention, a coating layer containing a conductivity-imparting material is provided directly on the conductor to suppress the adverse effects of residual metal powder and smooth the boundary with the insulating coating layer. The good adhesion between the conductor and the insulation coating layer effectively suppresses the start of discharge during use, and it has a long life and high-frequency withstand voltage as a high-frequency electric wire such as a high-frequency transformer or CRT deflection yoke coil. An insulated wire with excellent characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an insulated wire according to the present invention.

[Explanation of symbols]

 1 conductor, 2 coating layer containing conductivity imparting material, 3 insulating coating layer,

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toshio Niwa 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Keiji Nakano 1-1-5 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Creator Kazuo Hanaoka 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. An insulated electric wire obtained by baking an insulating coating layer on a conductor, wherein a coating layer containing a conductivity-imparting material is applied directly on the conductor. 2. The insulated wire according to claim 1, wherein the conductivity imparting material is conductive carbon, and the content thereof is 10 to 30 wt%. 3. The insulated wire according to claim 1, wherein the conductivity imparting material is conductive carbon and the average particle diameter thereof is 20 to 50 nm.