PURPOSE: To reduce the vibration during rotation and the noise accompanying the vibration by making a hole, which partially weakens the magnetic flux at the gap part between a stator and a salient pole, in the position equivalent to the specific angle in terms of the electric angle of the salient pole of a rotor. ;CONSTITUTION: Holes 5a and 5b are bored in the positions equivalent to 60° and 120° (mechanically 30° and 60°) in terms of the electric angles of the salient pole 5 of a rotor 2. Moreover, similarly holes 6a and 6b, 7a and 7b, and 8a and 8b are bored in the salient poles 6, 7, and 8, respectively. Hereupon, these holes 5a and 5b, 6a and 6b, 7a and 7b, and 8a and 8b partially decrease the magnetic flux in the gap part between the stator 1 and the salient poles 5-8. Hereby, the magnetic flux at the section, which were the peak position of torque ripple in the past, can be lessened, so nearly fixed composite torque can be gotten, and the vibration at rotation of the rotor and the noise accompanying the vibration can be reduced.;COPYRIGHT: (C)1993,JPO&Japio
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