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