Insulated wire, method of producing insulated wire, coil, rotating electrical machine, and electrical or electronic equipment
AssigneeEssex Furukawa Magnet Wire Japan Co., Ltd.
InventorsKenji Fujimori, Makoto Oya
Life of this patent
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Abstract
An insulated wire having at least one layer of coating of the wire, comprising a thermosetting resin layer, at the outer periphery of a conductor, wherein the thermosetting resin layer is comprised of thermosetting resin layers having a laminated structure formed by coating and baking a thermosetting resin varnish; and wherein, in said laminated structure, an innermost layer having contact with the conductor comprises a thermosetting resin having an imide bond and is a layer having an average thickness of more than 5 μm and 10 μm or less; a method of producing the insulated wire; a coil; a rotating electrical machine; and an electrical or electronic equipment.
Claims14
An insulated wire having at least one layer of coating of the wire, comprising a thermosetting resin layer, at the outer periphery of a conductor,
- wherein the thermosetting resin layer is comprised of thermosetting resin layers having a laminated structure formed by coating and baking a thermosetting resin varnish;
- and wherein, in said laminated structure, an innermost layer having contact with the conductor comprises a thermosetting resin having an imide bond and is a layer having an average thickness of more than 5 μm and 9 μm or less;
- wherein the thermosetting resin having an imide bond comprises a polyimide, a polyetherimide, or combinations thereof;
- and
- wherein the conductor is a rectangular conductor whose cross-sectional shape perpendicular to the longitudinal direction thereof is rectangular;
- and wherein, in the thickness of the innermost layer having contact with the conductor and locating on 4 sides that constitute a rectangle as the cross-sectional shape of said conductor, a thickness on both ends of at least one side excluding corners of the conductor is 1.2 to 2.0 times a thickness on a central part of said side.
A method of producing an insulated wire having at least one layer of coating of the wire, comprising a thermosetting resin layer at the outer periphery of a conductor,
- comprising a coating and baking step of repeating 2 times or more a step of coating and baking the same or different kind of a thermosetting resin varnish at the outer periphery of the conductor,
- wherein at a first step of coating and baking the thermosetting resin varnish, a varnish of a thermosetting resin having an imide bond is used to form a layer having an average thickness of more than 5 μm and 9 μm or less, and then a step of coating and baking a varnish of a thermosetting resin that is the same or different from said thermosetting resin having an imide bond is carried out, to thereby form a thermosetting resin layer having a laminated structure of 2 or more layers;
- wherein the thermosetting resin having an imide bond comprises a polyimide, a polyetherimide, or combinations thereof;
- and
- wherein the conductor is a rectangular conductor whose cross-sectional shape perpendicular to the longitudinal direction thereof is rectangular;
- and wherein, in the thickness of the innermost layer having contact with the conductor and locating on 4 sides that constitute a rectangle as the cross-sectional shape of said conductor, a thickness on both ends of at least one side excluding corners of the conductor is 1.2 to 2.0 times a thickness on a central part of said side.
Dependencies are inferred from the claim text.