A new type of self-correction ultrasonic motor using standing wave

This paper developed a new type of self-correction ultrasonic motor using standing wave. It differs from current self-correction ultrasonic motors in driving and control method. In operating stage of self-correction, the slits on rotor of the motor stay always at the projection teeth on the stator when two signals applied simultaneously to piezoelectric element which is adhered to stator are in phase for the new type of self-correction motor, but in opposite phase for current types of self-correction motor. It is notable that the projection teeth are located on the crests and troughs of a vibration mode of the stator for the new self-correction motor, but on the nodal diameters of a vibration mode of stator for current types. The experiments have shown that the self-correction function of the new type of self-correction motor is stronger than that of current types of self-correction motor. The rotation mechanism of the new type of self-correction motor is described in the paper.