| 摘要 |
To reduce as much as possible the motor vibration due to the effect of harmonic components contained in the induced electromotive force waveform induced in the armature coil (2a,2b). In a motor structure, the pole tooth shapes of one pole tooth (3a) and the pole tooth (4a) corresponding thereto constituting one phase are made different from each other by changing their areas or amounts of skew, whereby the third harmonies caused by variations in the magnetic fluxes interlinking with these pole teeth are caused to cancel each other. Thus, the rotational vibration which has hitherto been a problem can be reduced and, further, the accuracy of the rotor movement can be improved without lowering the dynamic torque characteristic of the motor. <IMAGE> |
