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Related Experiment Videos

Novel method for driving the ultrasonic motor.

Hyeoung woo Kim1, Shuxiang Dong, Pitak Laoratanakul

  • 1International Center for Actuators and Transducers, Materials Research Institute, The Pennsylvania State University, University Park 16802, USA. kuhl@psu.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 31, 2002
PubMed
Summary

A new driving method for ultrasonic motors uses a compact piezoelectric transformer instead of a traditional converter. This approach enables integration and miniaturization of ultrasonic motor drive circuits, achieving speeds over 300 rpm.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • Conventional ultrasonic motors often rely on bulky DC/AC converter drivers with electromagnetic transformers.
  • Integration and miniaturization of ultrasonic motor systems are significant challenges in actuator design.

Purpose of the Study:

  • To introduce a novel driving method for annular plate-type ultrasonic motors.
  • To explore the use of a compact piezoelectric transformer for high voltage output.
  • To assess the feasibility of driving an ultrasonic motor with a piezoelectric transformer, even with mismatched resonant frequencies.

Main Methods:

  • A compact disc-type piezoelectric transformer was employed as a driver for an annular plate-type ultrasonic motor.
  • The piezoelectric transformer was operated in radial vibration mode.

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  • A matching network was incorporated to accommodate differences in resonant frequencies between the transformer and motor.

    • Main Results:

    • The piezoelectric transformer successfully drove the ultrasonic motor, achieving a maximum speed exceeding 300 rpm.
    • The driving method proved effective even when the resonant frequencies of the piezoelectric transformer and ultrasonic motor were not identical.
    • The system demonstrated potential for compact integration.

    Conclusions:

    • The proposed driving method using a piezoelectric transformer offers a viable alternative to conventional drivers for ultrasonic motors.
    • This approach facilitates the integration and miniaturization of ultrasonic motor systems.
    • The findings pave the way for more compact and efficient ultrasonic motor applications.