Adjustable speed control of ultrasonic motors by adaptive control

Author

Senjyu, Tomonobu ; Uezato, Katsumi

Author_Institution

Fac. of Eng., Ryukyus Univ., Okinawa, Japan

fYear

1994

fDate

20-25 Jun 1994

Firstpage

1237

Abstract

The driving principle of the ultrasonic motor (USM) is different from those of the electromagnetic motors and its mathematical motor model has not been developed yet. Therefore, it is difficult to control the ultrasonic motor with high performances. The traveling-wave type ultrasonic motor is suitable for variable-speed drives. In this paper, the speed control system of the traveling-wave type ultrasonic motor is designed using adaptive control theory. Because the dynamic characteristics of the ultrasonic motor are unknown and vary with time, adaptive control theory which is useful for controlling the unknown plant is applied to design the adjustable speed control of USM. The mathematical motor model of USM is derived and motor parameters are identified by the recursively least square method. Therefore, this controller can always adjust the rotor speed to speed command, precisely

Keywords

adaptive control; machine control; machine theory; motor drives; rotors; ultrasonic motors; variable speed drives; velocity control; adaptive control; adjustable speed control; mathematical motor model; motor parameters; recursively least square method; rotor speed adjustment; traveling-wave type ultrasonic motor; ultrasonic motors; variable-speed drives; Adaptive control; Control systems; Control theory; Difference equations; Electronic mail; Inverters; Least squares methods; Mathematical model; Rotors; Velocity control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, PESC '94 Record., 25th Annual IEEE

Conference_Location

Taipei

Print_ISBN

0-7803-1859-5

Type

conf

DOI

10.1109/PESC.1994.373840

Filename

373840