| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration and noise by lowering the cogging torque. SOLUTION: A stator iron core 21 is formed in a closed slot core, where the end part of each tooth 23 is provided with a coupling part 25 for coupling the adjacent teeth 23 and is therefore formed in a structure with a plurality of grooves 27 arranged in different intervals in the circumferential direction to the coupling part 25. Since the stator iron core 21 is the closed slot core, cogging torque can be lowered in comparison with the open slot core, and moreover the groove 27 of the coupling part 25 is disposed in different intervals in the circumferential direction. As a result, the cogging torque generated at each slot 24 can be dispersed to reduce the whole cogging torque. |
