This paper describes the bending traveling-wave type ultrasonic motor which generated the traveling wave by combining two standing waves with phase difference time and space. In +20℃~30℃, the USM motor operation character has represented normal co...
This paper describes the bending traveling-wave type ultrasonic motor which generated the traveling wave by combining two standing waves with phase difference time and space. In +20℃~30℃, the USM motor operation character has represented normal condition. But the other temperature, (that is say, when long time operating condition) USM operation characteristic has abnormal condition, that is driving frequency, drive current and r.p.m is down. The recent USM has controller without temperature compensation, This study aimed at fuzzy controller which must follow the phase angle difference 90' at operation temperature and then r.p.m and torque increase.