HIGH-PERFORMANCE LOAD-ADAPTIVE SPEED CONTROL FOR ULTRASONIC MOTORS

Citation
A. Ferreira et P. Minotti, HIGH-PERFORMANCE LOAD-ADAPTIVE SPEED CONTROL FOR ULTRASONIC MOTORS, Control engineering practice, 6(1), 1998, pp. 1-13
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Robotics & Automatic Control","Robotics & Automatic Control
ISSN journal
0967-0661
Volume
6
Issue
1
Year of publication
1998
Pages
1 - 13
Database
ISI
SICI code
0967-0661(1998)6:1<1:HLSCFU>2.0.ZU;2-Z
Abstract
High-performance servo-control schemes using ultrasonic motors (USMs) as new actuators have not yet been applied in practice in modern indus try and office-automation systems, because the dynamic and steady-stat e modelling of USMs is extremely difficult from the theoretical point of view. In the first part of this paper, the rotational speed-control characteristics of a circular travelling wave motor are theoretically analysed and experimentally explored by using an experimental measuri ng system. In the second part, a newly-developed servo-control system using two feedback control loops based on a sensorless technique is de scribed. This technique, using strategies for both instantaneous contr ol and average value control, is based upon control of both the load-a daptive resonant frequency and a constant velocity. These control sche mes are considered theoretically, and experimental results are demonst rated and evaluated in practice. (C) 1998 Elsevier Science Ltd. All ri ghts reserved.