A compact ultrasonic motor-actuated software system implementation using fuzzy reasoning-based controller

The inherent performance of ultrasonic motor (USM) which is one of highlighted servo actuators includes the following favorable features; compactness in size and thickness, flexible design structure, lowered acoustic and magnetic noises in operation, and high-response due to low inertia. In addition to this, the USM can generate high-torque over an ultra low speed range as compared with the commonly-used electromagnetic motors of the same size. The authors consider the control strategy concerned with this USM from a practical point of view. They present the ultrasonic motor-actuated software servo system using fuzzy reasoning concepts. The fuzzy reasoning principle due to USM drive is introduced on the basis of the directly-driven positioning servo system applications. The experimental results of this system are illustrated and discussed practically. >