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A Compact Linear Ultrasonic Motor Composed by Double Flexural Vibrator.

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Summary

This study presents a minimized linear ultrasonic motor using two flexural bimorph vibrators. Optimized design achieved a maximum speed of 245 mm/s and 1.6 N thrust, validated by modal testing.

Keywords:
discrete structure optimizationlinear ultrasonic motorminimizationperformance evaluation

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Area of Science:

  • Mechanical Engineering
  • Robotics
  • Materials Science

Background:

  • Linear ultrasonic motors offer precise motion control.
  • Developing compact and efficient linear ultrasonic motors is crucial for miniaturized applications.

Purpose of the Study:

  • To propose and optimize a minimized linear ultrasonic motor.
  • To analyze and improve the performance of flexural bimorph vibrator-based linear ultrasonic motors.

Main Methods:

  • Utilized two flexural bimorph vibrators for the stator construction.
  • Employed Finite Element Analysis (FEA) to select working modes and optimize structural parameters.
  • Calculated frequency difference sensitivities to decrease mode frequency differences.
  • Constructed a prototype for modal testing and performance evaluation.

Main Results:

  • Modal testing results closely matched simulation predictions.
  • The optimized prototype achieved a maximum speed of 245 mm/s.
  • The prototype demonstrated a maximum thrust of 1.6 N.

Conclusions:

  • The proposed minimized linear ultrasonic motor design is effective.
  • FEA and modal testing are valuable tools for optimizing ultrasonic motor performance.
  • The optimized motor shows promising capabilities for high-speed and high-thrust applications.