| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent magnet type rotating electric machine capable of obtaining a high torque in a low speed range, performing efficient operation even during a high speed, and reducing slide and drag loss at the time of idle rotation. SOLUTION: The permanent magnets for forming a field flux are buried in a rotor, and a cavity portion is provided toward the axial center side from the permanent magnet. Movable magnetic substances are provided in the cavity to control the field flux crossing an armature winding by mechanically adjusting the position of the magnetic material. When the rotor is at a low speed, each of the magnetic substances is positioned at a portion with low magnetic resistance in the cavity, and the field flux of the rotor surface increases to obtain high torque. When the rotor is at a high speed, the magnetic substance moves to a portion with high magnetic resistance, and the field flux of the rotor surface is decreased to decrease a counter electromotive voltage generated at the armature winding. At the time of idle rotation, the magnetic substance is positioned at the portion with high magnetic resistance in the cavity, and the flux density of the stator is decreased together with the field flux, thus reducing the slide and drag loss. COPYRIGHT: (C)2004,JPO&NCIPI
|
