| 摘要 |
A brushless motor having permanent magnets that can be used as a prime mover for automobiles, in place of internal combustion engines, since the motor can yield high torque during low-speed rotation, as in the case of conventional types of brushless motors and can be used at high torque and with excellent motor efficiency at rotations three times as high as that of conventional types. The brushless motor having permanent magnets according to the invention comprises a stator having a plurality of stator magnetic poles and a winding for generating a rotating field in the stator magnetic poles, a rotor having a rotating shaft and field permanent magnets rotating with respect to the stator magnetic poles, a control circuit for detecting the position of magnetic poles of the field permanent magnet with respect to the stator and feeding current to the winding in accordance with the position; wherein the field permanent magnets comprise a first field permanent magnet having magnetic poles of different polarities alternately arranged in the direction of rotation, and a second field permanent magnet that is adapted to be rotatable with respect to the first field permanent magnet and has magnetic poles of different polarities alternately arranged in the direction of rotation; the first and second field permanent magnets facing the stator magnetic poles, and a mechanism for changing the phase of the synthesized magnetic poles of the first and second field permanent magnets in accordance with the rotation of the rotor is provided.
|
