Title:
永久磁石電動機ドライブシステム
Document Type and Number:
Japanese Patent JP5134846
Kind Code:
B2
Abstract:
A permanent magnet rotating electrical machine is capable of conducting a variable speed operation at high output in a wide range from low speed to high speed and improving efficiency and reliability in a wide operating range. Two kinds of permanent magnets 3 and 4 having different shapes or different magnetic characteristics are embedded in a rotor core 2, to form a magnetic pole 7. The permanent magnets arranged at the magnetic pole are the permanent magnet 3 whose product of coercive force and thickness along magnetizing direction is small and the permanent magnet 4 whose product of coercive force and thickness along magnetizing direction is large. A magnetic field created by passing a current to an armature coil 21 for a short time is used to irreversibly magnetize the permanent magnet whose product of coercive force and thickness along magnetizing direction is small, thereby changing a total linkage flux amount, and in addition, a positive d-axis current is passed when torque is large.
Inventors:
Kazuto Sakai
Kazuaki Yuki
Kazuaki Yuki
Application Number:
JP2007079327A
Publication Date:
January 30, 2013
Filing Date:
March 26, 2007
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H02K1/27; H02K21/14; H02P21/00; H02P21/02; H02P21/13; H02P21/22; H02P23/02; H02P23/16; H02P23/28; H02P27/04; H02P27/08
Domestic Patent References:
| JP2006280195A | ||||
| JP6087686A | ||||
| JP2004128101A | ||||
| JP89610A |
Attorney, Agent or Firm:
Hidekazu Miyoshi