JP2009129550A - Clad cable, litz wire, collective wire, and coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce loss in a high-frequency circuit, a direct current superimposing high-frequency circuit, a low-frequency superimposing high-frequency circuit, or a high-frequency circuit in which a frequency fluctuates. <P>SOLUTION: The clad cable comprises a copper wire 1 as a core, and an aluminum layer 2 formed on an outer circumferential surface of the copper wire. A thickness t of the aluminum layer 2 is 5-50% of a cross sectional area of the clad cable 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a clad wire, a litz wire, a collective wire, and a coil. More specifically, the present invention relates to a clad wire that can reduce loss in a high-frequency circuit, a DC superposition high-frequency circuit, a low-frequency superposition high-frequency circuit, or a high-frequency circuit whose frequency varies. , Litz wire, assembly wire and coil.

Conventionally, as a choke coil, a transformer, and an inductance, a litz wire in which a plurality of insulated copper wires are brought together is generally used.
In addition, tin-plated copper wires and copper-plated aluminum wires for improving solderability are known (see, for example, Patent Document 1).
JP-A-10-237664

Even with a litz wire obtained by twisting a copper wire or a plurality of insulated copper wires, loss increases at high frequencies.
On the contrary, in the case of an aluminum wire or a copper-plated aluminum wire, the loss may be reduced at a high frequency depending on conditions, but the loss is increased at a direct current or a low frequency.
That is, the conventional electric wire has a problem that it may not be suitable for a high-frequency circuit, a DC superimposed high-frequency circuit, a low-frequency superimposed high-frequency circuit, or a high-frequency circuit in which the frequency varies.
Accordingly, an object of the present invention is to provide a clad wire, a litz wire, a collecting wire, and a coil that can reduce loss in a high-frequency circuit, a DC superimposed high-frequency circuit, a low-frequency superimposed high-frequency circuit, or a high-frequency circuit in which the frequency varies. It is in.

In a first aspect, the present invention provides a clad electric wire obtained by forming an aluminum layer having a thickness of 5% or more and 50% or less of the cross-sectional area of the electric wire on the outer peripheral surface of the copper wire.
In the clad wire according to the first aspect, in a 152-turn coil using an insulated clad wire having a diameter of 0.3 mm and an aluminum area ratio of 5% (aluminum thickness 3.8 μm) to 10% (7.7 μm) At about 800 kHz or higher, the loss was reduced from the copper wire coil under the same conditions. Further, when the frequency was varied in the frequency range of about 400 kHz to 1000 kHz, the loss was reduced as compared with the copper wire coil under the same conditions at the same average effective current.
Further, in a 27-turn double-layer coil using an insulating clad wire having a diameter of 1.1 mm and an aluminum area ratio of 5% (aluminum thickness 13.9 μm) to 50% (161 μm), in a range of approximately 50 kHz to 100 kHz. Loss decreased compared to copper wire under the same conditions. In addition, when the frequency was varied in the frequency range of 30 kHz to 100 kHz, the loss decreased compared to the copper wire under the same conditions at the same average effective current.
If the aluminum area ratio exceeds 50%, the overall loss characteristic approaches that of an aluminum wire, and the DC resistance and low-frequency loss increase, which is not preferable.

In a second aspect, the present invention provides a litz wire including an insulated wire obtained by applying an insulation coating to the clad wire according to the first aspect.
The Litz wire according to the second aspect can obtain the same effect because the clad wire according to the first aspect is used.

In a third aspect, the present invention provides a collective line in which a plurality of insulated wires obtained by applying an insulation coating to the clad wire according to the first aspect are bundled.
Even in the collective line according to the third aspect, since the clad line according to the first aspect is used, the same effect can be obtained. The litz wire is an electric wire in which a plurality of strands are twisted and bundled, and the assembly wire is an electric wire in which a plurality of strands are bundled without being twisted.

In a fourth aspect, the present invention provides a coil formed by winding either the clad electric wire according to the first aspect, the Litz electric wire according to the second aspect, or the assembly wire according to the third aspect.
Since the coil according to the fourth aspect uses the clad electric wire according to the first aspect, the Litz electric wire according to the second aspect, or the assembly wire according to the third aspect, the same effect can be obtained.

  According to the clad wire, litz wire, assembly wire, and coil of the present invention, loss can be reduced in a high-frequency circuit, a DC superimposed high-frequency circuit, a low-frequency superimposed high-frequency circuit, or a high-frequency circuit in which the frequency varies. Moreover, it can also be reduced in weight.

  Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.

FIG. 1 is a cross-sectional view illustrating a clad wire 10 according to the first embodiment.
The clad wire 10 includes a copper wire 1 serving as a core and an aluminum layer 2 serving as a clad formed on the outer peripheral surface thereof.

  The thickness t of the aluminum layer 2 is not less than 5% and not more than 50% of the cross-sectional area of the clad wire 10.

FIG. 2 is a cross-sectional view illustrating the insulated clad wire 20 according to the second embodiment.
The insulated clad wire 20 is formed by forming the enamel insulation coating 3 on the outer peripheral surface of the clad wire 10.

FIG. 3 is a characteristic diagram of a solenoid coil in which an insulating clad wire having a diameter of 1.1 mm and an aluminum area ratio of 5% to 50% is wound around two layers and 27 turns.
The vertical axis of this characteristic diagram indicates the high-frequency resistance Ra of the solenoid coil as a relative value Ra / Rc with respect to the high-frequency resistance Rc in the coil having the same structure using an insulated copper wire. Therefore, the frequency region where the value on the vertical axis is smaller than “1” is a region where the loss is smaller than that of the coil having the same structure using the insulated copper wire.
As can be seen from FIG. 3, the loss is smaller when used at 50 kHz to 100 kHz than the coil having the same structure using an insulated copper wire or the coil having the same structure using an aluminum wire. Further, it can be seen that at frequencies lower than 200 kHz, the loss is smaller than that of the coil having the same structure using an aluminum wire.

FIG. 4 is a characteristic diagram of a solenoid coil in which a litz wire having 58 strands wound around an insulated clad wire having a diameter of 0.14 mm and an aluminum area ratio of 10% to 50% is wound in 21 turns per layer. It is.
As can be seen from FIG. 4, when used at 400 kHz to 1000 kHz, it can be seen that the loss is smaller than that of the coil having the same structure using an insulated copper wire. Further, it can be seen that at frequencies lower than 500 kHz, the loss is smaller than that of the solenoid coil having the same structure using an aluminum wire.

FIG. 5 is a characteristic diagram of a spiral coil in which 1500 layers of litz wire having a diameter of 0.05 mm and an aluminum area ratio of 10% to 50% are wound in two layers and 40 turns. It is.
As can be seen from FIG. 5, when used at 70 kHz to 100 kHz, the loss is smaller than that of the coil having the same structure using an insulated copper wire. It can also be seen that at a frequency lower than 85 kHz, the loss is smaller than that of the coil having the same structure using an aluminum wire.

FIG. 6 is a characteristic diagram of a solenoid coil in which an insulating clad wire having a diameter of 0.5 mm and an aluminum area ratio of 5% to 30% is wound around 93 turns per layer.
As can be seen from FIG. 6, when the aluminum area ratio is 5%, the loss is smaller than that of the coil having the same structure using the insulated copper wire when used at 100 kHz to 2000 kHz.

FIG. 7 is a characteristic diagram of a solenoid coil in which an insulating clad wire having a diameter of 0.3 mm and an aluminum area ratio of 5% to 30% is wound around 125 turns per layer.
As can be seen from FIG. 7, when the aluminum area ratio is 5%, the loss is smaller than that of the coil having the same structure using the insulated copper wire when used at 500 kHz to 1000 kHz.

  FIG. 8 is a perspective view of a collective wire 100 in which the insulated clad wires 20 of Example 2 are bundled without being twisted and covered with the covering tube 101.

FIG. 9A is a perspective view of an insulating clad wire 30 with an adhesive layer in which an adhesive layer 4 is formed on the outer periphery of the insulated clad wire 20 of the second embodiment.
FIG. 9B is a perspective view of the assembly line 200 in which the insulating clad electric wires 30 with an adhesive layer are bundled without being twisted and integrated with the adhesive layer 4.

  The clad wire, litz wire, collective wire, and coil of the present invention can be suitably used in a high frequency circuit, a DC superimposed high frequency circuit, a low frequency superimposed high frequency circuit, or a high frequency circuit in which the frequency varies. As a specific example, the present invention can be used for electromagnetic induction utilizing devices such as choke coils, transformers, inductors, and TV deflection yokes.

1 is a cross-sectional view illustrating a clad electric wire according to Example 1. FIG. 6 is a cross-sectional view showing an insulated clad wire according to Example 2. FIG. 10 is a graph showing loss characteristics of a solenoid coil according to Example 3. 6 is a graph showing loss characteristics of a solenoid coil according to Example 4; 10 is a graph showing loss characteristics of the spiral coil according to Example 5. 12 is a graph showing loss characteristics of a solenoid coil according to Example 6. 12 is a graph showing loss characteristics of a solenoid coil according to Example 7. It is a perspective view which shows the assembly line which concerns on Example 8. FIG. It is the perspective view which shows sectional drawing and the assembly line of the insulation clad electric wire with an adhesive layer which concerns on Example 9. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Copper wire 2 Aluminum layer 3 Insulation coating 4 Coated tube 10 Clad electric wire 20 Insulated clad electric wire 30 Insulated clad electric wire with an adhesive layer 100,200 Collecting line

Claims (4)

A clad electric wire formed by forming an aluminum layer having a thickness of 5% or more and 50% or less of the cross-sectional area of the electric wire on the outer peripheral surface of the copper wire. The litz wire which contains the insulated wire which gave the insulation coating to the clad wire of Claim 1 as a strand. An assembly wire in which a plurality of insulated wires obtained by coating the clad wires according to claim 1 with an insulation coating are bundled. A coil formed by winding either the clad electric wire according to claim 1, the Litz electric wire according to claim 2, or the assembly wire according to claim 3.

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