Electric motor and compressor provided with the same

Patent metadata

Field	Value
Publication number	US-10700566-B2
Application number	US-201616321545-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Oct 6, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An electric motor includes a stator unit, insulators, windings and insulating films. In the stator unit, a plurality of stators including respective iron cores each made of a magnetic body are arranged annularly. The insulators are provided at ends of the iron cores in an axial direction of the stator unit. The windings are wound around the insulators. The insulating films insulate the iron cores and the windings from each other. The insulating films are fixed between the iron cores and the insulators.

First claim

The invention claimed is:

1. An electric motor comprising:
a stator unit in which a plurality of stators including respective iron cores each made of a magnetic body are arranged annularly;
insulators provided at respective ends of the iron cores in an axial direction of the stator unit;
windings wound around the insulators; and
insulating films insulating the iron cores and the windings from each other, the insulating films being fixed between the iron cores and the insulators,
the iron cores including respective groove-shaped slot portions with which the insulators are engaged, with the insulating films interposed between the groove-shaped slot portions and the insulators,
the insulators including respective base portions around which the windings are wound, and legs which are engaged with the slot portions, with the insulating films interposed between the legs and the slot portions,
the legs including respective inner peripheral legs provided on an inner peripheral side of the stator unit, respective outer peripheral legs provided on an outer peripheral side of the stator unit, and respective center legs each of which connects one end side of an associated one of the inner peripheral legs and one end side of an associated one of the outer peripheral legs,
each of the inner peripheral legs, an associated one of the center legs and an associated one of the outer peripheral legs are continuous with each other and form a substantially U-shaped section,
the inner peripheral legs including respective grooves into which the insulating films are inserted,
the inner peripheral legs having respective inner peripheral surfaces formed on the inner peripheral side of the stator unit and respective first side surfaces formed in direction toward the peripheral side of the stator unit,
the grooves extending through the inner peripheral surfaces and the first side surfaces.

2. The electric motor of claim 1 , wherein the legs include respective recesses with which the insulating films are in contact.

3. The electric motor of claim 1 , wherein the legs includes respective first legs with which the iron cores are in contact, and respective second legs with which the insulating films are in contact, the second legs being thinner than the first legs.

4. The electric motor of claim 3 , wherein each of thickness differences between the first legs and the second legs is equal to a thickness of each of the insulating films.

5. The electric motor of claim 1 ,
wherein the inner peripheral legs have respective inner peripheral surfaces formed on the inner peripheral side of the stator unit and respective first side surfaces formed in a direction toward the peripheral side of the stator unit,
wherein the iron cores include respective arc-shaped core-back portions, respective tooth portions provided at the core-back portions on the inner peripheral side, and respective tooth tips which are provided on the tooth portions and with which the inner peripheral legs are engaged,
wherein the tooth tips have respective outer peripheral surfaces formed on the outer peripheral side of the stator unit,
wherein the core-back portions have respective second side surfaces formed in the direction toward the peripheral side of the stator unit, and
wherein a difference between angles θ 1 and θ 2 is 5 degrees or smaller, where θ 1 is an angle between each of the outer peripheral surfaces of the tooth tips and an associated one of the second side surfaces of the core-back portions, and θ 2 is an angle between each of the inner peripheral surfaces and an associated one of the first side surfaces of the inner peripheral legs.

6. The electric motor of claim 1 ,
wherein the inner peripheral legs have respective inner peripheral surfaces formed on the inner peripheral side of the stator unit, and respective first side surfaces formed in the direction toward the peripheral side of the stator unit,
wherein the iron cores includes respective arc-shaped core-back portions, respective tooth portions provided at the core-back portions on the inner peripheral sides, and respective tooth tips which are provided on the tooth portions and with which the inner peripheral legs are engaged,
wherein the tooth tips have respective outer peripheral surfaces formed on the outer peripheral side of the stator unit,
wherein the core-back portions have respective second side surfaces formed in the direction toward the peripheral side of the stator unit, and
wherein angles θ 1 and θ 2 are equal to each other, where θ 1 an angle between each of the outer peripheral surfaces of the tooth tips and an associated one of the second side surfaces of the core-back portions, and θ 2 is an angle between each of the inner peripheral surfaces and an associated one of the first side surfaces of the inner peripheral legs.

7. The electric motor of claim 1 , wherein a distance between the insulators provided at adjacent ones of the plurality of stators is four times a thickness of each of the insulating films.

8. The electric motor of claim 1 , wherein a distance between the insulators provided at adjacent ones of the plurality of stators is smaller than four times a thickness of the insulating film.

9. The electric motor of claim 1 , wherein the insulating films each include projecting portions at two respective ends of the each insulting film in the direction toward the peripheral side of the stator unit, the projecting portions each projecting in the axial direction.

10. A compressor provided with the electric motor of claim 1 .

11. An electric motor comprising:
a stator unit in which a plurality of stators including respective iron cores each made of a magnetic body are arranged annularly;
insulators provided at respective ends of the iron cores in an axial direction of the stator unit;
windings wound around the insulators; and
insulating films insulating the iron cores and the windings from each other, the insulating films being fixed between the iron cores and the insulators,
the iron cores including respective groove-shaped slot portions with which the insulators are engaged, with the insulating films interposed between the groove-shaped slot portions and the insulators,
the insulators including respective base portions around which the windings are wound, and legs which are engaged with the slot portions, with the insulating films interposed between the legs and the slot portions,
the legs including respective inner peripheral legs provided on an inner peripheral side of the stator unit, respective outer peripheral legs provided on an outer peripheral side of the stator unit, and respective center legs each of which connects one end side of an associated one of the inner peripheral legs and one end side of an associated one of the outer peripheral legs,
each of the inner peripheral legs, an associated one of the center legs and an associated one of the outer peripheral legs are continuous with each other and form a substantially U-shaped section,
the inner peripheral legs including respective grooves into which the insulating films are inserted,
the inner peripheral legs having respective inner peripheral surfaces formed on the inner peripheral side of the stator unit and respective first side surfaces formed in a direction toward the peripheral side of the stator unit, the grooves extending through the inner peripheral surfaces and the first side surfaces,
the iron cores including respective arc-shaped core-back portions, respective tooth portions provided at the core-back portions on the inner peripheral side, and respective tooth tips which are provided on the tooth portions and with which the inner peripheral legs are engaged,
the

Assignees

• Mitsubishi Electric Corp

Inventors

• Kato Keisuke
• Tamura Yuki
• Masumoto Koji

Classifications

• H02K3/345 Primary

  between conductor and core, e.g. slot insulation · CPC title

• H02K2203/12

  Machines characterised by the bobbins for supporting the windings · CPC title

• H02K1/148

  Sectional cores (H02K1/141 takes precedence) · CPC title

• H02K3/525

  Annular coils, e.g. for cores of the claw-pole type · CPC title

• H02K3/34 Primary

  between conductors or between conductor and core, e.g. slot insulation · CPC title