Back to results
US 12,476,026 B2Granted
Insulated wire and method for manufacturing insulated wire
AssigneeProterial, Ltd.
InventorsHajime Nishi, Takami Ushiwata, Yuki Honda
Life of this patent
Estimating the term…
Abstract
An insulated wire includes a conductor having an elongated shape and an insulating coating. The insulating coating is provided around the conductor. The insulating coating is formed by laminating multiple insulating layers, each of which includes pores.
Claims9
An insulated wire comprising:
- a conductor having an elongated shape;
- and
- an insulating coating provided around the conductor, the insulating coating being formed by laminating multiple insulating layers, each insulating layer including pores,
- wherein at a specific position of the insulating coating in a longitudinal direction thereof where no protrusions with a protruding length of 100 μm or longer are formed in an outer circumferential surface of the insulating coating, when an average value of respective thicknesses of the multiple insulating layers at a thick portion of the insulating coating having the largest thickness is defined as a first thickness and an average value of respective thicknesses of the multiple insulating layers at a thin portion of the insulating coating having the smallest thickness is defined as a second thickness, a thickness difference between the first thickness and the second thickness is 0.5 μm or less, and when a thickness of the thick portion is defined as a and a thickness of the thin portion is defined as b, a value of a thickness unevenness rate obtained by (b/a)×100 is 85.4% or more.
1 more element
A method for manufacturing an insulated wire comprising:
- a first application process including applying a coating material containing a polyamide acid to a circumference of a conductor, the coating material being obtained by (i) adding a pore forming agent to a solvent by a specific part by weight with respect to a resin component in the coating material before synthesis and (ii) stirring and mixing the coating material;
- a first thickness adjusting process including inserting the conductor applied with the coating material through a first through-hole of a first die, to thereby adjust a thickness of the coating material applied to the circumference of the conductor to a specific thickness;
- and
- a first insulating layer forming process including:
- heating the coating material having the specific thickness to a specific temperature, to thereby remove the solvent in the coating material;
- imidizing the polyamide acid contained in the coating material in a state where phase separation occurs between the pore forming agent and the polyamide acid;
- and
- thermally decomposing or vaporizing the pore forming agent contained in the coating material, to thereby form an insulating layer,
- wherein the resin component and the pore forming agent are regarded as apparent non-volatile components, and a thickness of the insulating layer is determined based on the apparent non-volatile components, and
- wherein, in the first thickness adjusting process, the specific thickness is determined based on a sum of volumes of the resin component and the pore forming agent, which are contained in the coating material, with respect to a volume of the coating material.
7 more elements
Dependencies are inferred from the claim text.