A study on the metal tube type ultrasonic motor (MTTUSM)

The main motivation of this study hopes to understand the characteristic of the metal tube type ultrasonic motor (MTTUSM) through simple components, different driving or operation ways, its characteristic includes the rotational speed, driving phase angle and the relation of operation time and temperature rise. And hopes it can be applied to drive the small-scale optics lens mould or precision fixed position system. According to the experimental results, the maximum rotational speed is 2,075 rpm under conditions of 140 V_p-p driving voltage, 62 kHz resonance frequency, 60^deg phase angle and 0.5 mm thickness of piezoelectric ceramic slice. In addition, the speed that rising temperature is in direct proportion to the thickness of the piezoelectric ceramic and driving voltage. The temperature rises to 66.7^degC from 20^degC under conditions of 140 V_p-p driving voltage, 62 kHz, 90^deg driving phase angle and piezoelectric ceramic of 12 mm*2 mm*0.5 mm size. At last, the MTTUSM is applied to push the optics lens, finds its biggest thrust is 420 mN under conditions of 140 V_p-p driving voltage, screw of M2 size and piezoelectric ceramic of 12 mm*2 mm*0.4 mm size.