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Updated: Feb 8, 2026

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Extended optimum frequency tracking scheme for ultrasonic motor.

Weijia Shi1, Hui Zhao2, Bo Zhao1

  • 1Ultra-Precision Optoelectronic Instrument Engineering Center, 150080, 2 Yikuang Street, Nangang District, Harbin, China.

Ultrasonics
|June 25, 2018
PubMed
Summary

A new optimum frequency tracking scheme for ultrasonic motors allows for adjustable voltage amplitudes. This method minimizes motor loss and temperature rise, enhancing industrial applicability, especially for wide-range velocity adjustments.

Keywords:
LossOptimum frequencyPiezoelectric actuatorsVelocity control

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Area of Science:

  • Mechanical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Ultrasonic motors are widely used in various industrial applications.
  • Existing optimum frequency tracking schemes often require identical voltage amplitudes, limiting their applicability.
  • Minimizing energy loss and temperature rise is crucial for efficient and reliable ultrasonic motor operation.

Purpose of the Study:

  • To develop a general optimum frequency tracking scheme for ultrasonic motors that does not require identical voltage amplitudes.
  • To investigate the relationship between mechanical quality factor, energy loss, and temperature rise.
  • To demonstrate the effectiveness of the proposed scheme in reducing temperature rise and extending the application range of optimum frequency.

Main Methods:

  • Derivation of the mechanical quality factor to quantify energy loss in ultrasonic motors.
  • Determination of the optimum operating frequency based on minimizing energy loss and subsequent temperature rise.
  • Construction and experimental validation of the optimum frequency tracking scheme with adjustable voltage amplitudes and phase differences.

Main Results:

  • The existence of an optimum frequency was experimentally verified, even with general applied voltages (adjustable amplitudes and phase difference).
  • The proposed scheme significantly reduced the temperature rise of the ultrasonic motor without external cooling.
  • The optimized frequency tracking scheme enhances the applicability of ultrasonic motors, particularly for applications requiring wide velocity adjustments.

Conclusions:

  • A generalized optimum frequency tracking scheme for ultrasonic motors has been successfully developed and validated.
  • The scheme effectively minimizes energy loss and temperature rise, improving motor performance and efficiency.
  • This advancement brings ultrasonic motor technology closer to broader industrial adoption, especially in variable-speed applications.