Magnetic inductor electric motor

Patent metadata

Field	Value
Publication number	US-2016226355-A1
Application number	US-201414916197-A
Country	US
Kind code	A1
Filing date	Jun 18, 2014
Priority date	Sep 24, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

A first stator core and a second stator core are configured by arranging pairs of core blocks into an annular shape, the pairs of core blocks being configured by stacking together core blocks so as to be spaced apart axially, the core blocks including circular arc-shaped core back portions and teeth, permanent magnets are each configured so as to be divided into a plurality of magnet blocks that are held between the pairs of core blocks so as to fit inside the pairs of core blocks, and the magnet blocks include a base portion that is held between the core back portions, and that has an external shape in which two circumferential side surfaces are positioned circumferentially inside two circumferential side surfaces of the core back portions.

First claim

1 : A magnetic inductor electric motor comprising:
a housing that is produced using a nonmagnetic material; a stator comprising:
a stator core that is configured such that a first stator core and a second stator core that are produced so as to have identical shapes in which teeth that form slots that have openings on an inner circumferential side are disposed at a uniform angular pitch circumferentially so as to project radially inward from an inner circumferential surface of a cylindrical core back are disposed coaxially so as to be separated axially and such that circumferential positions of said teeth are aligned; and
a plurality of coils that are produced by winding a conductor wire onto respective pairs of said teeth of said stator core that face each other axially using a concentrated winding method,
said stator being disposed inside said housing;
a rotor in which a first rotor core and a second rotor core that are produced so as to have identical shapes in which salient poles are disposed so as to project at a uniform angular pitch circumferentially on an outer circumferential surface of a cylindrical base portion are fixed coaxially to a rotating shaft such that said first rotor core is positioned on an inner circumferential side of said first stator core and said second rotor core is positioned on an inner circumferential side of said second stator core, and such that said first rotor core and said second rotor core are offset circumferentially by a pitch of half a salient pole from each other, said rotor being disposed rotatably inside said housing; and permanent magnets that are disposed between said first stator core and said second stator core, and that generate field magnetic flux such that said salient poles of said first rotor core and said salient poles of said second rotor core have different polarity, wherein: said first stator core and said second stator core are configured by arranging core block pairs into an annular shape such that circumferential side surfaces of circular arc-shaped core back portions contact each other, said core block pairs being configured by stacking together core blocks so as to be spaced apart axially, said core blocks comprising said core back portions and said teeth, which protrude radially inward from inner circumferential surfaces of said core back portions; said permanent magnets are each configured so as to be divided into a plurality of magnet blocks that are held between said core block pairs so as to fit inside said core block pairs; and said magnet blocks comprise a base portion that is held between said core back portions, and that has an external shape in which two circumferential side surfaces are positioned circumferentially inside two circumferential side surfaces of said core back portions.

2 : The magnetic inductor electric motor according to claim 1 , wherein said first stator core and said second stator core are each configured by linking said core blocks continuously such that said core back portions are linked at bending facilitating portions.

3 : The magnetic inductor electric motor according to claim 1 , wherein:
said core blocks are configured by stacking together a plurality of core block segments axially; and said core block segments that are axially adjacent are configured so as to have different amounts of circumferential protrusion of said core back portions from said teeth.

4 : The magnetic inductor electric motor according to claim 1 , wherein said core blocks are configured by laminating magnetic steel sheets.

Assignees

• Mitsubishi Electric Corp

Inventors

• Arita Hideaki
• Daikoku Akihiro
• Doi Hirofumi

Classifications

• H02K1/17

  Stator cores with permanent magnets · CPC title

• H02K21/44 Primary

  with armature windings wound upon the magnets · CPC title

• H02K16/02 Primary

  Machines with one stator and two {or more} rotors · CPC title

• H02K1/22

  Rotating parts of the magnetic circuit · CPC title

• H02K1/14

  Stator cores with salient poles · CPC title