JPH06168633A - Covered conductor - Google Patents

Abstract

PURPOSE:To provide a covered conductor, which can eliminate the component of the electromagnetic noise to be induced by the current transmitted through which, without adding a filter circuit specially to an electric circuit for connecting the conductor. CONSTITUTION:A covered conductor consists of a wire material 10 and a covering material 2. The wire material 10 is made of copper having the excellent conductivity, and multiple narrow wires 1 are collected to form the wire material 10. The covering material 2 is made of the insulating material 4, which consists of a magnetic powder material 3 made of Co ferrite and a rubber, and formed into a cylindrical shape to cover the periphery of the wire material 10 concentrically. The powder material 3 is made of the sufficiently fine powder and distributed evenly in the whole of the inside of the insulating material 4. The covering material 2 includes the powder material 3, but the covering material 2 has the excellent insulating property by the insulating material 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated conductive wire characterized by the structure of a coating material which coats the surface of a wire material having good electrical conductivity with good insulation, It is used to remove the component of electromagnetic noise from the current transmitted through the wire.

[0002]

2. Description of the Related Art Conventionally, as a coated wire whose surface is coated with a coating material to protect a wire used as a transmission line such as a signal line or a power supply line, copper or the like having good electric conductivity is used. A wire rod made of a metal such as aluminum and a covering material made of vinyl or rubber having a good insulating property is generally used.

Further, a shielded wire typified by a coaxial cable is used to shield electromagnetic noise between the wire used as a signal wire and the outside world. This coaxial cable is a combination of a single wire member made of a conductor arranged in the center and a cylindrical member made of a conductor that concentrically surrounds the surface, and is used as a transmission line for high-frequency alternating current. . Due to the skin effect, the high-frequency alternating current transmitted through the coaxial cable is concentrated on the surface of the central wire and on the inner surface of the outer cylindrical material, so the coaxial cable can reduce radiation loss from the inside and disturbance from the outside. Acts to prevent.

[0004]

However, in the above-described coated wire, induction of the electromagnetic noise component in the current transmitted through the wire cannot be prevented. Even with a shielded wire represented by the coaxial cable as described above, it is not possible to completely prevent induction of an electromagnetic noise component in a current transmitted through the conductor due to fluctuations in the ground potential connecting the shield. Therefore, there are problems such as radiation characteristics of electromagnetic noise from the electric circuit connecting these conductors to the outside world, and stable operability of the electric circuit due to interference of electromagnetic noise from the outside world. By adding a filter circuit formed from capacitors, it is necessary to eliminate the component of electromagnetic noise induced in the current carried through these conductors.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a coated conductor which eliminates a component of electromagnetic noise induced in a current transmitted through the conductor without adding a filter circuit in an electric circuit connecting the conductor. And

[0006]

In the coated wire according to the present invention, the surface of a wire having good electrical conductivity is coated with a coating having good insulation, and the coating is made of a magnetic material. The feature is that the powder material is included almost uniformly.

[0007]

Since the coated wire according to the present invention is constructed as described above, the coating material acts as an inductance with respect to the alternating current in the high frequency range transmitted through the wire, and generally, most electromagnetic noise is in the high frequency range. Since it appears, it acts so that the component of electromagnetic noise induced by the current transmitted through the wire can be removed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

First, the structure of an embodiment of the coated conductor according to the present invention will be described with reference to FIG. FIG. 1A is a configuration diagram of an embodiment of the coated conductor wire according to the present invention. Figure 1
1B is a sectional view taken along the line AA of the embodiment shown in FIG. As shown in FIG. 1 (a), the coated conductive wire is composed of a wire rod 10 and a coating material 2. The wire rod 10 is
It is made of copper, which is a metal having good electrical conductivity, and is composed of a large number of fine wires 1 bundled together. The covering material 2 concentrically covers the periphery of the wire rod 10 arranged at the center thereof,
It is shaped like a cylinder. As shown in FIG. 1B, the coating material 2 is C obtained by mixing and sintering Fe ₂ O ₃ and CoO.
The magnetic powder material 3 is made of ferrite and the insulating material 4 is made of rubber. The powder material 3 is a sufficiently fine powder and is distributed almost uniformly throughout the inside of the insulating material 4. While the covering material 2 contains the powder material 3, the insulating material 4
Has a good insulating property.

Next, the operation of the above embodiment will be described with reference to FIG. Since the coating material 2 contains the powder material 3, the magnetic permeability of the whole is increased as compared with the case where it is composed of only the insulating material 4, and the inductance thereof is increased in proportion to the magnetic permeability. Therefore, the wire rod 10 can be regarded as being equivalent to a state in which the coils are connected in series by the coating material 2. Therefore, if the amplitude I _{0 of the} alternating current transmitted through the wire 10 is φ ₀ , its angular frequency is ω, the resistance of the wire 10 is R, and the inductance of the coating material 2 is L, then It can be expressed by the relational expression shown in.

I ₀ = φ ₀ / {R ² + (Lω) ² } ^{0.5 According to the} above equation, the high frequency component of the alternating current is removed by its corresponding large impedance, and the covering material 2
It can be seen that gives the effect of a filter depending on the frequency. Generally, a lot of electromagnetic noise appears in the high frequency range, so
Most of the electromagnetic noise appearing in the alternating current transmitted through the wire 10 is removed by the coating 2.

As described above, in the above embodiment, the electromagnetic noise component induced by the current transmitted through the wire can be removed. Further, in the above-mentioned embodiment, the coating material is manufactured at a low cost because the raw materials of the constituent rubbers such as rubber and Co ferrite are inexpensive. Therefore, it is possible to easily and inexpensively improve the radiation characteristic of electromagnetic noise from the electric circuit connected to the above-mentioned embodiment to the outside world and the stable operability of the electric circuit due to the interference of electromagnetic noise from the outside world.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, the powder material is not limited to Co ferrite, but Fe ₂ O ₃ and BaO may be used.
Ba ferrite or Fe ₂ O obtained by mixing and sintering
It may be Sr ferrite obtained by mixing and sintering ₃ and SrO.

[0014]

As described above in detail, according to the present invention, since the coating material acts as an inductance with respect to the alternating current in the high frequency range transmitted through the wiring material, an electric circuit for connecting the coated conductive wire is provided. Especially, there is an effect that it is possible to provide a covered conductor that removes a component of electromagnetic noise induced by a current transmitted through the wire without adding a filter circuit.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a coated conductor wire according to the present invention.

[Explanation of symbols]

1 ... Fine wire, 2 ... Covering material, 3 ... Powder material, 4 ... Insulating material, 10 ...
wire.

Claims (1)

[Claims] 1. A coated wire for coating the surface of a wire having good electrical conductivity with a coating having good insulation, wherein the coating contains a magnetic powder material substantially uniformly. Covered wire.