Title :
Ultrasonic rotary motor using a longitudinal-torsional vibration converter
Author :
Tsujino, Jiromaru ; Takeuchi, Masanobu ; Koshisako, Hiroshi
Author_Institution :
Fac. of Eng., Kanagawa Univ., Yokohama, Japan
Abstract :
The characteristics of ultrasonic rotary motors using a converter from longitudinal to torsional vibration are studied. To obtain a rotary motor with large torque, ultrasonic motors using some types of slitted longitudinal-torsional converters are proposed. The longitudinal-torsion vibration converter consists of cylinders with a diagonally slitted vibration-converting part. Ultrasonic motors consist of such a converter with a driving part at its free edge and a rotor part clamped statically to a driving surface. The direction of rotation of these ultrasonic motors may be reversed using higher-order vibration modes. Maximum torques obtained are over 110 kgf-cm using a 40-mm-diameter converter and over 170 kgf-cm using a 50-mm-diameter converter. The maximum efficiency of a 50-mm-diameter motor was 17% when the output torque was 120 kgf-cm. The efficiency can be improved by installing piezoelectric ceramic disks or transducers within the longitudinally and/or torsionally vibrating converter part
Keywords :
piezoelectric motors; 17 percent; large torque; longitudinal-torsional vibration converter; maximum efficiency; piezoelectric ceramic disks; ultrasonic rotary motors; Ceramics; Copper; Engine cylinders; Piezoelectric transducers; Resonance; Rotors; Springs; Torque converters; Ultrasonic transducers; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275844
