	US 12,288,631 B2
	Insulated wire, coil, and electrical or electronic equipment
Daisuke Muto, Tokyo (JP); Keiichi Tomizawa, Tokyo (JP); and Hideo Fukuda, Tokyo (JP)
Assigned to ESSEX FURUKAWA MAGNET WIRE JAPAN CO., LTD., Tokyo (JP)
Filed by Essex Furukawa Magnet Wire Japan Co., Ltd., Tokyo (JP)
Filed on Jul. 8, 2021, as Appl. No. 17/370,134.
Application 17/370,134 is a continuation of application No. PCT/JP2020/011211, filed on Mar. 13, 2020.
Claims priority of application No. 2019-097354 (JP), filed on May 24, 2019.
Prior Publication US 2021/0343446 A1, Nov. 4, 2021
Int. Cl. H01B 3/30 (2006.01); H02K 3/30 (2006.01); H02K 3/40 (2006.01)

CPC H01B 3/306 (2013.01) [H01B 3/305 (2013.01); H02K 3/30 (2013.01); H02K 3/40 (2013.01)]

8 Claims

1. An insulated wire, comprising:

a conductor; and

an insulating film provided on an outer periphery of the conductor, wherein the insulating film satisfies the following relation at 0.2 atm between a relative permittivity (ε) of the insulating film and a relative permittivity (ε₀) of an outermost layer of insulating layers constituting the insulating film:

ε≤2.4 and ε₀/ε≥1.2.

wherein the insulating film satisfies the following relation between a thickness (T) of the insulating film and a thickness (T₀) of the outermost layer of the insulating film:

0<T₀/T≤0.1 and T≥30 μm,

wherein each of the insulating layers constituting the insulating film is made of a resin material containing polyimide or polyamide imide, and

wherein the insulating film has two or three layers.