Electric motor with housing fixed to end face of stator core

Patent metadata

Field	Value
Publication number	US-2020366152-A1
Application number	US-202016861396-A
Country	US
Kind code	A1
Filing date	Apr 29, 2020
Priority date	May 15, 2019
Publication date	Nov 19, 2020
Grant date	—

Abstract

A feed axis motor includes a front-side housing fixed to an end face of a stator core. The stator core is formed of a material with iron as a main component. The front-side housing is formed of a material with aluminum as a main component. The stator core and the front-side housing are coupled with each other at a welding mark generated by laser welding. The welding mark extends in a circumferential direction so as to cover a line of contact between the stator core and the front-side housing. The welding mark seals the boundary portion between the stator core and the front-side housing.

First claim

1 . An electric motor comprising:
a rotor including a shaft; a stator including a stator core and a coil wound around the stator core; and a housing fixed to an end face of the stator core, wherein the stator core is formed of a material with iron as a main component, the housing is formed of a material with aluminum as a main component, the stator core and the housing are coupled with each other by a welding mark generated by laser welding, the welding mark is formed at a boundary portion at which the stator core and the housing are contacting, extends in a circumferential direction so as to cover a line of contact between the stator core and the housing, and seals the boundary portion between the stator core and the housing.

2 . The electric motor according to claim 1 , wherein
the housing includes a step portion formed at a boundary portion; the stator core includes a step portion formed at a boundary portion; the step portion of the housing and the step portion of the stator core contact and form a recess portion at the boundary portion; the welding mark is formed on a bottom surface of the recess; and the recess has a depth configured to accommodate the welding mark within the recess.

3 . The electric motor according to claim 1 , wherein
one member of the housing and the stator core includes a step portion formed at a boundary portion, and the step portion is formed being higher than a height of protrusion of the welding mark.

4 . The electric motor according to claim 1 , further comprising a plurality of the housings, wherein
the plurality of the housings include a front-side housing disposed in a direction in which the shaft protrudes, and a rear-side housing disposed on a side opposite to the direction in which the shaft protrudes, the welding marks are formed at a boundary portion between the front-side housing and the stator core and a boundary portion between the rear-side housing and the stator core.

Assignees

• Fanuc Corp

Inventors

• Lee Seungjun

Classifications

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• B23K26/0006

  taking account of the properties of the material involved (B23K26/32, B23K26/40 take precedence) · CPC title

• H02K15/028

  Fastening stator or rotor bodies to casings, supports, shafts or hubs · CPC title

• H02K5/10 Primary

  with arrangements for protection from ingress, e.g. water or fingers · CPC title

• H02K5/02

  Casings or enclosures characterised by the material thereof · CPC title