摘要 |
A synchronous electric motor having a structure for reducing cogging torque generated by the positioning error of a permanent magnet. Protrusions are alternately arranged in regions A and B in the circumferential direction of an iron core. Therefore, with respect to neighboring magnets positioned on both sides of the first protrusion, in region B, where the protrusion does not exit, ends of the neighboring magnets are attracted to each other by magnetic force. On the other hand, with respect to the neighboring magnets positioned on both sides of the second protrusion, in region A, where the protrusion does not exit, ends of the neighboring magnets are attracted to each other by magnetic force resulting in being inclined in opposing directions, and thus the generated cogging torque is significantly reduced. |