Sumitomo Electric Industries, Limited

Sumitomo Electric Wintec, Inc.

Kengo Yoshida

Masaaki Yamauchi

Shinya Ota

Yasushi Tamura

Jun Sugawara

Hideaki Saito

Shuhei Maeda

Yuji Hatanaka

Toru Shimizu

Hiroji Sugimoto

Yudai Furuya

Masataka Shiwa

Junichi Imai

Takao Inoue

Yuudai Furuya

An insulated electrical cable includes: a conductor; and an insulating layer that is laminated on an outer peripheral surface of the conductor and includes a polyimide as a main component, wherein the insulating layer includes a plurality of pores, and wherein a porosity of the insulating layer is greater than or equal to 25% by volume and less than or equal to 60% by volume.

Insulated electrical cable

A method for producing an insulated electric wire includes a step of preparing a conductor having a linear shape; a step of forming an insulating coating so as to cover a surface on an outer peripheral side of the conductor to obtain an insulated electric wire that includes the conductor and the insulating coating covering the conductor; and a step of measuring a first electrostatic capacity between the insulated electric wire and a first electrode disposed outside in a radial direction of the insulated electric wire so as to face an outer peripheral surface of the insulated electric wire while transporting the insulated electric wire in a longitudinal direction of the conductor, and inspecting a formation state of the insulating coating, the formation state including a formation state of a defective portion in the insulating coating, on the basis of a change in the first electrostatic capacity.

Method for producing insulated electric wire, method for inspecting insulated electric wire, and apparatus for producing insulated electric wire

An insulated electric wire includes a linear conductor and one or a plurality of insulating layers formed on an outer peripheral surface of the conductor. At least one of the one or plurality of insulating layers contains a plurality of pores, outer shells are disposed on peripheries of the pores, and the outer shells are derived from shells of hollow-forming particles having a core-shell structure. A varnish for forming an insulating layer contains a resin composition forming a matrix and hollow-forming particles having a core-shell structure and dispersed in the resin composition. In the varnish, cores of the hollow-forming particles contain a thermally decomposable resin as a main component, and shells of the hollow-forming particles contain a main component having a higher thermal decomposition temperature than the thermally decomposable resin.

Insulated electric wire and varnish for forming insulating layer

An insulated wire according to one embodiment of the present invention includes a linear conductor, and one or a plurality of insulating layers that are laminated on an outer peripheral surface of the conductor, wherein at least one layer of the one or plurality of insulating layers includes a plurality of pores, and a closed porosity within the plurality of pores is 80% by volume or higher.

Insulated wire

An insulated electric wire includes a linear conductor and one or more of insulating layers formed on an outer peripheral surface of the conductor. In the insulated electric wire, at least one of the one or more of insulating layers has a plurality of pores, outer shells are disposed on peripheries of the pores, and each of the outer shells has a plurality of projections on an outer surface thereof.

Insulated electric wire and method for producing insulated electric wire

An insulating varnish forms an insulating coating film having a shape that corresponds to the shape of an opening of a die, having a uniform thickness. The insulating varnish is applied onto a surface of a conductor, subsequently passes through a die to remove the excess applied insulating varnish, and is then dried or baked to form an insulating coating film on the surface of the conductor. The insulating varnish has a viscosity of 10 Pa&#xb7;s or more measured by a B-type viscometer at 30&#xb0; C. The insulating varnish preferably contains no filler, and is preferably a polyimide precursor solution. Since the insulating varnish has a high viscosity, baking and solidification can be performed while maintaining a shape formed when the insulating varnish passes through a die.

Growing community of inventors

Koka, Japan

Kengo Yoshida