Method for manufacturing a stator

Patent metadata

Field	Value
Publication number	US-11223259-B2
Application number	US-201816192116-A
Country	US
Kind code	B2
Filing date	Nov 15, 2018
Priority date	Nov 17, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

To effectively cover a coil end with a resin layer. A method for manufacturing a stator includes a first resin layer forming step (ii) of forming a first thermoset resin layer by impregnating the tip end side of a coil end with first thermoset resin, the coil end protruding from the core of the stator, the first thermoset resin having liquidity; a second resin layer forming step (iii) of forming a second thermoset resin layer on the first thermoset resin layer by dropping second thermoset resin from the core side of the coil end toward the tip end side; and a curing step of curing the first thermoset resin and the second thermoset resin.

First claim

The invention claimed is:

1. A method for manufacturing a stator, comprising:
a first resin layer forming step of forming a first thermoset resin layer by impregnating a tip end side of a coil end with first thermoset resin, the coil end protruding from a core of the stator, the first thermoset resin having liquidity; and
a second resin layer forming step of forming a second thermoset resin layer on the first thermoset resin layer by dropping second thermoset resin from a core side of the coil end toward the tip end side; and
a curing step of curing the first thermoset resin and the second thermoset resin, wherein
in the first resin layer forming step, the first thermoset resin is liquid and pooled inside a die, and
the tip end side of the coil end is plunged into the first thermoset resin, which is liquid, and kept plunged until a level of a liquid surface of the first thermoset resin inside the die rises along a circumferential wall of the die and lowers in a middle portion of the first thermoset resin.

2. The method for manufacturing a stator according to claim 1 , wherein the second thermoset resin has viscosity lower than that of the first thermoset resin.

3. The method for manufacturing a stator according to claim 2 , wherein
the curing step includes a first curing step and a second curing step,
the first curing step is executed after the first resin layer forming step to cure the first thermoset resin, and
the second curing step is executed after the second resin layer forming step to cure the second thermoset resin.

4. The method for manufacturing a stator according to claim 1 , wherein
the curing step includes a first curing step and a second curing step,
the first curing step is executed after the first resin layer forming step to cure the first thermoset resin, and
the second curing step is executed after the second resin layer forming step to cure the second thermoset resin.

5. The method for manufacturing a stator according to claim 1 , wherein the coil end including a plurality of coil conducting wires aligned in a circumferential direction of the stator protrudes from the core of the stator.

Assignees

• Toyota Motor Co Ltd
• Denso Corp

Inventors

• Kawai Masashi
• Nishikuma Yasushi
• Takeda Hiroaki

Classifications

• H02K15/26 Primary

  Applying fastening means on winding heads · CPC title

• B29C41/02 Primary

  for making articles of definite length, i.e. discrete articles · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• B29C41/14

  Dipping a core {(B29C41/10 takes precedence)} · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title