Ultrasonic motors
K. Nakamura, Tokyo Institute of Technology, Japan
Abstract:
An ultrasonic motor is a piezoelectric device which produces rotary or linear motion from ultrasonic vibrations via friction. Ultrasonic motors produce a much larger torque/force than conventional electromagnetic motors. Several basic principles are introduced for rotary and linear motors. Two orthogonal vibration components are essential for constructing an ultrasonic motor: one normal to the contact interface between the vibrator and the rotor/ slider while the other is parallel to the interface. Two standing waves or a traveling wave are used, to give a standing-wave ultrasonic motor or a traveling-wave ultrasonic motor. Fundamental concepts for realizing ...
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