Answers are grounded in this paper and cite their sources.
A piezoelectric ultrasonic motor is constructed by tightly contacting a rotor to a piezoelectric ultrssonic resonator with eliptical vibrstion (PUREV). The PUREV successfully operated with a torsion coupler in which a torsional mode coupled with a bending mode is excited by the same frequency longitudinal vibration. The typical values of the present motor are 120 r.p.m. with no load, and 90 r.p.m. with a load of 13 kg-cm, under a 40 kHz/100 volt sinsoidal voltage, i.e. 12 watts with 80% efficiency. These values correspond to a high output power density of 80 W/kg over the limit value 30 W/kg expected in the ordinary motors.
No takes yet. Share an insight, caveat, or question.
Akio Kumada (1985) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: