MICRO-DRIVER FOR ULTRASONIC MOTOR BASED ON COMPLEX PROGRAMMABLE LOGICAL DEVICE

Li Huafeng - Zhao Chunsheng

   First, the relation between the output voltage and energy efficiency of an ultrasonic motor driver and the duty cycle of the driving pulse is analyzed. The rationality of 37% duty cycle is proved in this paper. Then a mini-driver based on CPLD for ultrasonic motor is designed and manufactured. The driver is applied to a TRUM-45 type traveling-wave ultrasonic motor developed by our Research Center. Experimental results show that this scheme is valid and feasible. Compared with the original driver composed of separate logical circuits, this mini-driver can be reduced by 66% in volume and 40% in element numbers, which fulfils the demand of practicability for general engineering.

Keywords: ultrasonic motor, driver, CPLD

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