# US 10,483,820 B2 · Method of encapsulating induction motor stator

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- Number: US 10,483,820 B2
- Document ID: US10483820B2
- Status: Granted
- Kind: B2
- Application number: 15/992,156
- Filed: 2018-05-29
- Published: 2019-02-21
- Granted: 2019-11-19
- Earliest claimed: 2017-08-18
- Assignees: Shanghai XPT Technology Limited
- Applicants: Shanghai XPT Technology Limited
- Inventors: Miao Luo; Jifei Ma; Kangjun Luo; Zhaofeng Li; Bohan Yang
- Web page: https://patentgrep.com/patent/US10483820B2

## CPC

- H02K 5/08: Insulating casings
- H02K 1/12: Stationary parts of the magnetic circuit
- H02K 3/30: Windings characterised by the insulating material
- H02K 3/32: Windings characterised by the shape, form or construction of the insulation
- 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

An induction motor stator encapsulate method, including arranging a stator of an induction motor in a case of the induction motor, wherein the stator comprises a stator core and a stator winding surrounding the stator core; filling a first encapsulating material into the case for forming a first insulation layer, wherein the first insulation layer directly covers the stator winding; and filling a second encapsulating material into the case for forming a second insulation layer, wherein the second insulation layer covers the first insulation layer; wherein a shrink rate of the first encapsulating material is smaller than a shrink rate of the second encapsulating material.

## Claims

### Claim 1

An induction motor stator encapsulate method, comprising:
arranging a stator of an induction motor in a case of the induction motor, wherein the stator comprises a stator core and a stator winding surrounding the stator core;
filling a first encapsulating material into the case for forming a first insulation layer, wherein the first insulation layer directly covers the stator winding; and
filling a second encapsulating material into the case for forming a second insulation layer, wherein the second insulation layer covers the first insulation layer;
wherein a shrink rate of the first encapsulating material is smaller than a shrink rate of the second encapsulating material.

### Claim 2 (depends on 1)

The induction motor stator encapsulate method of claim 1, wherein the first encapsulating material is silicon.

### Claim 3 (depends on 2)

The induction motor stator encapsulate method of claim 2, wherein the second encapsulating material is epoxy resin.

### Claim 4 (depends on 3)

The induction motor stator encapsulate method of claim 3, wherein a volume of the first encapsulating material filled in the case is greater than a volume of the second encapsulating material filled in the case.

### Claim 5 (depends on 1)

The induction motor stator encapsulate method of claim 1, further comprising:
arranging the stator and the case in a sealed container; and
vacuum pumping the sealed container.

### Claim 6

An induction motor stator encapsulation structure, comprising:
a case;
a stator, arranged in the case, the stator comprising:
a stator core; and
a stator winding surrounding the stator core;
a first insulation layer, formed by a first encapsulating material and directly covering the stator winding; and
a second insulation layer, formed by a second encapsulating material and covering the first insulation layer;
wherein a shrink rate of the first encapsulating material is smaller than a shrink rate of the second encapsulating material.

### Claim 7 (depends on 6)

The induction motor stator encapsulation structure of claim 6, wherein the first encapsulating material is silicon.

### Claim 8 (depends on 7)

The induction motor stator encapsulation structure of claim 7, wherein the second encapsulating material is epoxy resin.

### Claim 9 (depends on 6)

The induction motor stator encapsulation structure of claim 6, wherein a thickness of the second insulation layer is greater than 2 millimeters.