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Multi-layer insulating wire and transformer using it

A multi-layer insulation and insulating layer technology, applied in transformer/inductor parts, transformer/inductor coils/windings/connections, organic insulators, etc., can solve the problems of difficulty in increasing production speed, poor appearance, and high cost

Inactive Publication Date: 2007-01-10
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, because of the high cost of the resin and its property that its appearance deteriorates when it is stretched at a high shear rate, it is difficult to increase its production speed, and like the insulating tape, the cost of the wire becomes very high. high
In addition, in the case of this insulating layer, there is such a problem that since the insulating layer cannot be removed by dipping in a solder bath, the insulating layer at the end can only be removed by unreliable mechanical means, and when the When the end is used as an insulated wire connected to e.g. one end, the wire must be soldered or mechanically connected
[0011] According to the test method of Appendix U (insulated wire) of Article 2.9.4.4 of IEC950-Standard and Appendix C (Transformer) of Article 1.5.3, although the heat resistance of these multilayer insulated wires is acceptable for heat resistance class E, However, it still cannot meet the higher and higher requirements for heat resistance in recent years, and it is unqualified for the heat resistance level B of the IEC standard

Method used

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  • Multi-layer insulating wire and transformer using it
  • Multi-layer insulating wire and transformer using it
  • Multi-layer insulating wire and transformer using it

Examples

Experimental program
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Effect test

Embodiment 1-18 and comparative example 1-5

[0079] As conductors, bare wires (solid wires) and stranded wires of annealed copper wires with a diameter of 0.4 mm were prepared, each consisting of seven stranded cores (insulated wires), and each was coated with insulating varnish WD-4305 ( manufactured by Hitachichemical Co. Ltd.) was prepared by coating an annealed copper wire having a diameter of 0.15 mm so that the coating thickness of the varnish layer was 8 µm. These conductors were successively coated by extrusion coating with resin layers having the following formula (the composition is shown in parts by weight) for extrusion coating, the thicknesses of which are shown in Table 1, thus making many Layer insulated wire (surface treatment: use refrigeration oil).

[0080] With regard to the multilayer insulated wire thus produced, its properties were tested as follows:

[0081] Solderability:

[0082] A length of about 40 mm of the end of the insulated wire was immersed in molten solder at a temperature of 450°C, a...

Embodiment 19-21 and comparative example 6

[0127] Multilayer insulated wires were prepared in the same manner as in Example 3, as shown in Table 2, but for the resin mixtures (parts of the composition are parts by weight) used for the first to third insulating layers, the polyether Ratio of sulfone resin to polycarbonate resin.

[0128] In Comparative Example 6, a multilayer insulated wire was prepared, wherein the first layer and the second layer were composed of a resin mixture of polyethylene terephthalate and ionomer, as shown in Table 2, and The third layer is made of nylon 6,6.

[0129] These insulated wires were tested as follows, and in this test, the heat resistance test (2) was included in the heat resistance evaluation because the heat resistance test (1) was only valid for judging whether the heat resistance passed Class B or Class E. In order to compare the heat resistance, the heat resistance test (2) was added by the simplified evaluation method used to test the heat resistance of the enameled wire (com...

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Abstract

There is disclosed a multilayer insulated wire comprising a conductor and solderable extrusion-insulating layers made up of two or more layers for covering the conductor, wherein at least one insulating layer is formed by a resin mixture comprising 100 parts by weight of a resin (A), of at least one selected from polyetherimide resins and polyethersulfone resins, and 10 parts by weight or more of a resin (B), of at least one selected from polycarbonate resins, polyarylate resins, polyester resins, and polyamide resins. There is also disclosed a transformer using the multilayer insulated wire. The multilayer insulated wire is excellent in heat resistance, solderability, and coilability, and is favorably suitable for industrial production. The transformer is excellent in electrical properties and high in reliability..

Description

technical field [0001] The invention relates to a multilayer insulated wire whose insulating layer is composed of two or more extruded adhesive layers. The invention also relates to a transformer in which said multilayer insulated wire is used. More particularly, the present invention relates to a multilayer insulated wire useful as a coil and as a wire for a transformer, for example, in electric and electronic equipment; said wire has excellent heat resistance and has excellent solderability , enabling the insulating layer to be removed in a short time when said wire is immersed in a solder bath, so as to allow the solder to easily adhere to the conductor. The invention also relates to a transformer using said multilayer insulated wire. Background technique [0002] IEC (International Electrotechnical Communication) Standard Publication No. 950 and others specify the structure of the transformer. That is, these standards stipulate that at least...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/42H01F27/32
CPCY10T428/2938Y10T428/2929Y10T428/2975Y10T428/31725Y10T428/31507Y10T428/2933H01F27/323
Inventor 东浦厚小林勇千田尚之
Owner FURUKAWA ELECTRIC CO LTD
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