Patent ID: 7459876

Claim:
A control method for preventing shake of a motor, the motor comprising a stator and a rotor, the rotor having a plurality of north poles and south poles, the control method comprising the steps of: providing a first sensor and a second sensor on the stator in a manner that the first and second sensors are disposed in such a manner that the first and second sensors never simultaneously detect boundaries between the north and south poles during rotation of the rotor, wherein only the first and second sensors are disposed on the stator; outputting first signal when the first sensor detects any one of the north poles during the rotation of the rotor and a second signal when the first sensor detects any one of the south poles; outputting a third signal when the second sensor detects any one of the north poles during rotation of the rotor, and a fourth signal when the second sensor detects any one of the south poles; and shutting off the motor when the first signal and the second signal are alternately output by the first sensor, and the third signal or the fourth signal is continuously sent out longer than a predetermined duration.