| 摘要 |
A permanent magnet electric motor comprises a stator (20) including a stator ring (22) integrally formed of a magnetic material into a ring shape and a plurality of stator salient poles (24) disposed on the outer periphery of the stator ring (22) at even intervals, and a rotor (10) provided with permanent magnets (12a) disposed at equal intervals and opposing the inner periphery of the stator ring (22). The permanent magnets (12a) are allowed to rotate along the inner periphery of the stator ring (22). The rotor (10) is synchronously driven by supplying the exciting coils (24b) of the stator salient poles (24) with an exciting current according to a predetermined order at a predetermined timing for providing a desired excitation polarity, by means of an excitation controller (30). In the state where no exciting coils (24b) are excited, the rotor (10) provided with the permanent magnets (12a) is rendered rotatable along the inner periphery of the stator ring (22) at substantially no load, and hence, the motor exhibits a good startup characteristic. <IMAGE> |
