| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise due to resonance of an outer rotor of an outer rotor type rotary electric machine.SOLUTION: When a different-rigidity part B1 including a through hole 611a is formed at a yoke plate part 611 of an outer rotor 6, the outer rotor 6 has two toric m-order modes in which antinode and a node have their positions fixed and shift in position from each other in a rotary electric machine rotating direction, and the toric m-order modes appear at two resonance frequencies. Thus, the antinode and node have their position fixed and shift in position from each other in the rotary electric machine rotating direction, part of electromagnetic force is not converted into vibration at each resonance frequency, and noise due to resonance of the outer rotor 6 is reduced. Further, when the different-rigidity part B1 including a through hole 611a is provided to the yoke plate part 611, the amount of magnetic flux passing through a yoke cylinder part does not decrease and generated torque of an electric motor does not decrease either.SELECTED DRAWING: Figure 2 |
