Asmo Co., Ltd.

Masashi Ishikawa

Motoyasu Yano

An ultrasonic motor includes a stator and a rotor. The stator has piezoelectric elements. When an alternating current having a predetermined frequency is applied to the piezoelectric elements, the elements axially vibrate. The stator axially vibrates in response to the axial vibration of the piezoelectric elements. The rotor includes projections arranged about its axis. The projections contact the stator. Each projection is designed and formed such that it torsionally vibrates independently in response to the axial vibration of the stator. As a result, a compact and high torque motor is produced.

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Hamamatsu, Japan

Masashi Ishikawa