A force-feed-back actuator used for a haptic virtual reality system requires a rapid reactive force generation to present the realistic touch of a surface roughness and hardness on a virtual object. In general, an ultrasonic motor (USM) have a quick response, however, a torque free condition that gives no feeling to a user doesn't exist on USM. One of solutions of this problem is to have a static clutch mechanism within a USM. A novel ultrasonic motor equipping with a clutch mechanism was proposed and examined.
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