Abstract:An ultrasonic motor is generally composed of a vibrator and a rotor, and is driven by the frictional force between stator/rotor. Since the contact points on the stator draw elliptic trajectory, relative speed of the point against the rotor varies even when the rotor rotates with a constant speed. This may cause wear and a decrease in efficiency. This research proposes a novel method to reduce the relative speed variation to improve the efficiency of ultrasonic motors by superimposing harmonic vibration with dr… Show more
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