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High resolution miniaturized stepper ultrasonic motor using differential composite motion.

Xiangcheng Chu1, Zengping Xing, Longtu Li

  • 1Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, PR China. chuxiangcheng@tsinghua.edu.cn

Ultrasonics
|March 5, 2004
PubMed
Summary

Researchers developed a new method to reduce the minimum stepped angle in ultrasonic motors (USM). This differential composite motion (DCM) technique significantly improves precision while maintaining high torque, offering enhanced performance for USM applications.

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Area of Science:

  • Mechanical Engineering
  • Robotics
  • Materials Science

Background:

  • Ultrasonic motors (USM) exhibit a limited minimum stepped angle, restricting their precision in certain applications.
  • Current research focuses on improving the angular resolution of stepper USMs operating in a wobbling mode.

Purpose of the Study:

  • To present a novel method for decreasing the minimum stepped angle of ultrasonic motors.
  • To investigate the effectiveness of differential composite motion (DCM) for enhancing USM precision.

Main Methods:

  • A prototype USM utilizing the principle of differential composite motion (DCM), involving simultaneous clockwise and counterclockwise rotation, was designed and fabricated.
  • Experimental validation was performed on the prototype with varying rotor materials (fiberglass, antifriction material, steel) and a stator made of steel.

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Main Results:

  • The DCM method successfully reduced the minimum stepped angle from 46 arcseconds (conventional) to 12 arcseconds.
  • The prototype demonstrated stable operation exceeding 150 hours within a 5 kHz frequency band.
  • The proposed method maintained high torque even with a large stepped angle.

Conclusions:

  • Differential composite motion (DCM) is an effective strategy for significantly decreasing the minimum stepped angle in ultrasonic motors.
  • This approach offers a viable solution for applications requiring high-precision motion control with USMs.
  • The developed USM prototype shows promise for reliable, long-term operation.