Title :
A study on high efficiency drive of ultrasonic motors
Author :
Senjyu, Tomonobu ; Yokoda, Satoru ; Uezato, Katsumi
Author_Institution :
Fac. of Eng., Ryukyus Univ., Okinawa, Japan
Abstract :
Ultrasonic motors possess many advantages such as high torque, low speed, compactness in size and no magnetic field generation. However, there are several technical problems to be solved. Improvement of efficiency is important from the view point of the low power drive. The purpose of this work is to achieve maximum efficient drive of ultrasonic motor. Firstly, this paper shows characteristics based on efficiency of ultrasonic motor and proposes a search method of the maximum efficiency point. Furthermore, this paper presents a speed control method of the motor by PWM control of DC source combined with drive frequency control in order to realize maximum efficient drive
Keywords :
AC motor drives; PWM invertors; angular velocity control; frequency control; machine control; ultrasonic motors; DC source; PWM control; drive frequency control; efficiency improvement; high efficiency drive; high torque; low speed; maximum efficient drive; search method; two phase inverter; ultrasonic motors; DC motors; Frequency control; Pulse width modulation; Pulse width modulation inverters; Search methods; Sensor phenomena and characterization; Stators; Torque; Velocity control; Voltage control;
Conference_Titel :
Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
Print_ISBN :
0-7803-3773-5
DOI :
10.1109/PEDS.1997.618731
