Fuzzy PID Speed Control of Traveling Wave Ultrasonic Motor Using Voltage Amplitude Regulation

Accordance with ultrasonic motor's time-variable nonlinearity,a online adaptive correction based on fuzzy logic was presented.The special nature of ultrasonic motor's speed control were fully taken into account in designing fuzzy rules.The amplitude of driving voltage was used as the control parameter to realize the control method.The experiments indicate that the control characteristics are much better than that of PID controller.