The Furukawa Electric Co., Ltd.

Naoyuki Chida

Isamu Kobayashi

Atsushi Higashiura

Kunihiko Mori

A multilayer insulated wire has two or more extrusion-coating insulating layers provided on a conductor directly or via some other layer, or provided on the outside of a multicore wire composed of conductor cores or insulated cores that are collected together, wherein at least one of the insulating layers is made of a mixture prepared by mixing 100 parts by weight of a polyethersulfone resin and 10 to 100 parts by weight of an inorganic filler. A transformer utilizes the multilayer insulated wire. The multilayer insulated wire can realize such high heat resistance as heat resistance F class (155&deg; C.), which satisfies IEC 950 standards, or higher heat resistance, in transformers; and can exhibit excellent electrical properties even at high frequencies. Further, when the transformer is used at high frequencies, the electric properties are not lowered, and influence by the generation of heat can be prevented.

Multilayer insulated wire and transformer using the same

There is disclosed a multilayer insulated wire which comprises 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 mixture comprising 100 parts by weight of a resin (A), of at least one selected from the group consisting of polyetherimide resins and polyethersulfone resins, 10 parts by weight or more of a resin (B), of at least one selected from the group consisting of polycarbonate resins, polyarylate resins, polyester resins, and polyamide resin, and 15 to 200 parts by weight of an inorganic filler (C). There is also disclosed a transformer which utilizes the multilayer insulted wire. The multilayer insulated wire is excellent in heat resistance, solderability, high-frequency characteristic, and coilability, and it is favorably suitable for industrial production. Further, the transformer utilizing the multilayer insulated wire is excellent in electrical properties and high in reliability, since when used at high frequencies, electric properties are not lowered and influence by the generation of heat can be prevented.

Multilayer insulated wire and transformers made by using the same

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.

There is disclosed an insulated wire having an extrusion-coating insulating layer provided on the outer surface of a conductor directly or via some other layer, or provided on the peripheral surface of a multicore wire composed of conductor cores or insulated cores that are collected together, wherein the extrusion-coating insulating layer is made of a resin mixture to be extrusion-coated, which comprises 100 parts by weight of a resin (A) comprising a polyethersulfone resin, as an essential component, and, optionally, a polyetherimide resin, and 10 to 100 parts by weight of a resin (B) comprising at least one resin selected from polycarbonate resins, polyarylate resins, polyester resins, and polyamide resins. According to the insulated wire whose insulating layer is formed by the extrusion coating method, its direct solderability is excellent, and at least its heat resistance is better than that of conventional polyester-series resins, and by some blending proportions of the resin mixture, the insulated wire results in heat resistance that easily satisfies at least Heat Resistance Class B stipulated by IEC standard Pub. 172.

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Tokyo, Japan

Naoyuki Chida