AN ULTRASONIC MOTOR DRIVER USING A RESONANT BOOSTE

Li Huafeng - Zhao Chunsheng

   According to the capacitive characteristic of the ultrasonic motor, a non-transformer driver scheme for ultrasonic motor using LC~resonant is proposed in this paper. The circuit is theoretically analyzed and verified by simulation. The relationships of the amplitudes and energy efficiency of the harmonic wave for the output voltage with the driving duty ratio and resonant cycle number are analyzed in detail. Based on this, the design criteria of the circuit are established. The circuit is applied to a 5 mm ultrasonic motor. The output voltage is above 200 V (Vpp), the motor works well. It is proved that this circuit is both feasible and reliable for the drive of small-power USM, which makes it easier for the driver to realize integration.

Keywords: ultrasonic motor, driver, resonant, miniature

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