| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a permanent magnet embedded rotor which realizes field weakening control with simple structure. <P>SOLUTION: A magnetic material piece contact/separation mechanism 30 is provided adjacent to a rotor circumferential direction end part 24a of a permanent magnet 24 which is embedded inside a rotor 14 of a motor. In the magnetic material piece contact/separation mechanism 30, a magnetic material piece 38 is in contact with an inner surface of a bridge part 36 of the rotor 14 when the rotation speed is high, and the magnetic material piece 38 does not contact with the bridge part 36 when the rotation speed is low. <P>COPYRIGHT: (C)2012,JPO&INPIT |
