US 12,633,431 B2Granted

Insulated electric wires

AssigneeLS Eco-Materials., Ltd.

InventorsEun Ah Kim, Dong Jin Seo, Jae Yong Kim

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Abstract

The present disclosure relates to an insulated electric wire, and more particularly, to an insulated electric wire that has characteristics of a low dielectric constant and a high partial discharge inception voltage (PDIV) by forming a plurality of micropores inside insulating material of an insulating layer. According to the present disclosure, the insulated electric wire may have the plurality of micropores evenly dispersed inside the insulating material of the insulating layer to have the low dielectric constant without lowering the thermal and mechanical properties and increase the PDIV, so the insulated electric wire can be used as the insulated electric wire for the next-generation electric vehicle motors that use a higher voltage than the existing voltage.

Claims7

Dependent claims

An insulated electric wire, comprising:

a conductor;
and
an insulating layer surrounding the conductor,
wherein the insulating layer includes a varnish having a plurality of micropores with a cross-sectional area of 3.14×10−6 mm2 or less, and when a relative dielectric constant of the insulating layer is expressed as A in Expression 1 below, the relative dielectric constant A of the insulating layer satisfies Expression 2 below,
A
=
128
,
867
*
t
*
(
1
/
X
)
^
2.173913
[
Expression
⁢
1
]
A
≤
3.2
[
Expression
⁢
2
]
in the above Expression 1, t refers to a thickness of the insulating layer, and X refers to a voltage value when a leakage charge is 100 pC after two specimens of the insulated electric wire are cut to a length of 100 mm, coupled, and tied at 20 mm intervals, and then an electrode is connected to the coupled portion of the insulated electric wire whose film is removed at 10 mm long to make a current flow depending on a voltage boosting rate of 10 V/s under conditions of a temperature of 25° C. and a relative humidity of 50% or less.

30 more elements

Dependencies are inferred from the claim text.