Abstract
High-performance servo-control schemes using ultrasonic motors (USMs) as new actuators have not yet been applied in practice in modern industry and office-automation systems, because the dynamic and steady-state 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 measuring system. In the second part, a newly-developed servo-control system using two feedback control loops based on a sensorless technique is described. This technique, using strategies for both instantaneous control and average value control, is based upon control of both the load-adaptive resonant frequency and a constant velocity. These control schemes are considered theoretically, and experimental results are demonstrated and evaluated in practice.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
