# US 11,444,501 B2 · Stator having an insulating film for a coil

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- Number: US 11,444,501 B2
- Document ID: US11444501B2
- Status: Granted
- Kind: B2
- Application number: 16/572,773
- Filed: 2019-09-17
- Published: 2020-03-19
- Granted: 2022-09-13
- Earliest claimed: 2018-09-19
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Ryotaro Kaneko; Tadao Nishiyama; Keisuke Azusawa
- Web page: https://patentgrep.com/patent/US11444501B2

## CPC

- H02K 3/40: for high voltage, e.g. affording protection against corona discharges
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/38: around winding heads, equalising connectors, or connections thereto
- H02K 15/105: {to the windings}
- H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A stator includes a stator core, and a coil mounted on the stator core and having an insulating film, at least a part of the insulating film being coated with a protective paint, wherein the insulating film has a vacancy, and the vacancy is formed by a hollow capsule. In addition, the protective paint has a powder, and an internal form of the vacancy is smaller than an external form of the powder.

## Claims

### Claim 1

A stator comprising:
a stator core; and
a coil mounted on the stator core and having an insulating film, at least a part of the insulating film being coated with a protective paint,
wherein the insulating film has vacancies therein,
the vacancies are formed by hollow capsules,
the protective paint has a powder,
an internal form of the vacancies is smaller than an external form of the powder, and
at least a portion of the capsules are exposed at a surface of the insulating film.

### Claim 2 (depends on 1)

The stator according to claim 1, wherein at least a part of at least one capsule is exposed at an outer circumferential surface of the insulating film.

### Claim 3

A method of manufacturing a stator, comprising:
a coil mounting process of mounting a coil on a stator core, the coil having a conductor and an insulating film configured to cover the conductor and having a vacancy formed by a hollow capsule therein; and
a coating process of applying a protective paint on the conductor and the insulating film of a coil end protruding from the stator core due to the coil mounting process to perform insulation processing on the coil end,
wherein the protective paint has a powder, and
an internal form of the vacancy is smaller than an external form of the powder.