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Patent Searching and Data


Title:
PERMANENT MAGNET MOTOR
Document Type and Number:
Japanese Patent JP2007151233
Kind Code:
A
Abstract:

To effectively reduce a cogging torque, a vibration and a noise in a permanent magnet motor.

The permanent magnet motor (1) comprises: a stator (2) having a stator iron core (10) provided with a plurality of magnetic pole teeth (12) and slots (16) for a stator winding; and a rotor (3) having a plurality of fixed permanent magnets (5) and rotatably supported within the stator. A plurality of the permanent magnets are divided in the direction of the center of a rotating shaft. Each permanent magnet is circumferentially shifted so as to cancel the cogging torque. A stator iron core piece (20a) is disposed in a region of the stator iron core facing a boundary (9) of the divided permanent magnet and having the closed slots.


Inventors:
NAKAYAMA TADAHIRO
YOKOYAMA MITSUYUKI
SHINOHARA TAKESHI
Application Number:
JP2005338786A
Publication Date:
June 14, 2007
Filing Date:
November 24, 2005
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H02K1/27; H02K1/16; H02K21/14
Domestic Patent References:
JP2005080365A2005-03-24
JPS60144121A1985-07-30
JP2000152528A2000-05-30
JPS6117876A1986-01-25
JP2003070189A2003-03-07
JP2003284276A2003-10-03
Foreign References:
WO2004093298A12004-10-28
Attorney, Agent or Firm:
Tsuyoshi Sato
Kiyoshi Ogawa