Title :
Transducer for an ultrasonic linear motor with flexible driving part
Author :
Wakai, Tokiya ; Kurosawa, Minoru Kuribayashi ; Higuchi, Toshiro
Author_Institution :
Tokyo Univ., Japan
Abstract :
An ultrasonic motor using two sandwich-type vibrators is a high-speed and large-thrust motor. The maximum speed is 3.5 m/s and the maximum thrust is 51 N. But the maximum efficiency is low, 28%. We thought a slip between the driving part and the rotor was a cause of the low efficiency. The slip is caused by a speed difference between the driving part whose speed changes like a sine curve and the rotor whose speed is almost constant. Then we made a transducer for an ultrasonic linear motor with a flexible driving part. The flexible driving part has 4 cuts and can bend slightly so that the speed difference should decrease. The decrease was verified by a distortion of the sine curve of the flexible driving part and meant a decrease of the slip
Keywords :
linear motors; rotors; ultrasonic motors; ultrasonic transducers; 3.5 m/s; distortion; efficiency; flexible driving part; high-speed large-thrust motor; rotor; sandwich-type vibrators; sine curve; slip; speed difference; transducer; ultrasonic linear motor; AC motors; Ceramics; Fasteners; Piezoelectric materials; Resonance; Resonant frequency; Rotors; Stators; Ultrasonic transducers; Vibration measurement;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762240