An ultrasonic motor using low-frequency magnetostrictive excitation for continuous and stepwise angular rotation

Abstract

A new design for an ultrasonic motor operating at a frequency of about 14.5 kHz for generating continuous as well as stepwise angular rotation has been developed. The device uses a magnetostrictive ferrite transducer and a single power amplifier for its operation. A possible mechanism for the operation of the ultrasonic motor has been suggested. The variation of the speed of rotation as a function of frequency, excitation voltage, and load has been studied. The measurement of the performance characteristics reveal that the ultrasonic motor is capable of giving 100 rpm at 34.6-W electric output. The rpm of the rotating disk can be controlled by a slight adjustment of the frequency of the rf signal to the driving transducer. The load capability of the device is 1 kg. Using a tone burst of 10 ms, an angular step of 1.8 deg has been realized.

A piezoelectric linear ultrasonic motor with the structure of a circular cylindrical stator and slider

“…Ultrasonic motors can be divided into traveling wave type and standing wave type from the viewpoint of the vibration characteristics of a stator, and also be divided into rotation type and linear type from the motion of the rotor or slider [10,11]. The standing wave can be generated using eigenmode combinations or setting some teeth on the surface of the piezoelectric ceramic (PZT) material, [12,13] and the traveling wave can also be obtained using mode combination, impedance matching, active control and surface acoustic wave theory [14][15][16][17][18][19].…”