A self-sensing wedge-wave ultrasonic motor using modal sensors

Tai Ho Yu*, Ching-Chung Yin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

This paper experimentally and computationally examines the modal sensors integrated with a recently developed rotary ultrasonic motor (USM) driven by continuous wedge waves of the fundamental modes with the integer circumferential modal number. The traveling wave is formed from constructive interference of two equal-intensity standing waves induced by two comb transducers using dual sinusoidal excitations in 90 degree phase difference. The transducers and modal sensors are segmented in strips around the circumference of piezoelectric tube in the circular wedge-like motor stator. The latter are used to monitor the dynamic response of the stator during operation. The response of USM acquired by the proposed modal sensors has distinct vital characteristics in different frequency bands. The high-pass signals are used not only to note the variation in phase difference between excitations but to detect the resonant frequency, which is altered by payload, wear situation, etc. The low-pass signal reveals the revolution speed and dynamic reaction of the motor stator exerted by frictions and contact forces because of the rotor. The time-frequency response of stator is further characterized during the period in which the revolving direction of rotor is switched over.

Original languageEnglish
Title of host publicationCIMTEC 2008 - Proceedings of the 3rd International Conference on Smart Materials, Structures and Systems - Emboding Intelligence in Structures and Integrated Systems
PublisherTrans Tech Publications Ltd
Pages52-56
Number of pages5
ISBN (Print)9783908158134
DOIs
StatePublished - 1 Jan 2008
Event3rd International Conference on Smart Materials, Structures and Systems - Embodying Intelligence in Structures and Integrated Systems, CIMTEC 2008 - Acireale, Sicily, Italy
Duration: 8 Jun 200813 Jun 2008

Publication series

NameCIMTEC 2008 - Proceedings of the 3rd International Conference on Smart Materials, Structures and Systems - Emboding Intelligence in Structures and Integrated Systems
Volume56

Conference

Conference3rd International Conference on Smart Materials, Structures and Systems - Embodying Intelligence in Structures and Integrated Systems, CIMTEC 2008
CountryItaly
CityAcireale, Sicily
Period8/06/0813/06/08

Keywords

  • Modal sensors
  • Time-frequency response
  • Ultrasonic motor

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    Yu, T. H., & Yin, C-C. (2008). A self-sensing wedge-wave ultrasonic motor using modal sensors. In CIMTEC 2008 - Proceedings of the 3rd International Conference on Smart Materials, Structures and Systems - Emboding Intelligence in Structures and Integrated Systems (pp. 52-56). (CIMTEC 2008 - Proceedings of the 3rd International Conference on Smart Materials, Structures and Systems - Emboding Intelligence in Structures and Integrated Systems; Vol. 56). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/AST.56.52