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A standing wave-type noncontact linear ultrasonic motor
1Center for Smart Materials and Department of Applied Physics, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. fjhui@hotmail.com
Summary
A novel noncontact linear ultrasonic motor uses acoustic standing waves to levitate and drive a slider. This study provides guidelines for optimizing slider displacement and speed through stator vibration and slider design.
Area of Science:
- Mechanical Engineering
- Acoustics
- Tribology
Background:
- Noncontact linear ultrasonic motors offer potential for precise motion control.
- Understanding the driving mechanism of acoustic streaming is crucial for motor performance.
Purpose of the Study:
- To propose and analyze a novel standing wave-type noncontact linear ultrasonic motor.
- To develop a theoretical model for the motor's driving force based on acoustic streaming.
- To establish guidelines for enhancing slider displacement and speed.
Main Methods:
- Construction of a prototype motor with a wedge-shaped aluminum stator and a multilayer PZT vibrator.
- Observation of slider levitation and motion.
- Development of a theoretical model assuming turbulent acoustic streaming as the driving force.
- Comparison of theoretical predictions with experimental results.
Main Results:
- The theoretical model showed good agreement with experimental data.
- Increased stator vibration displacement and decreased stator vibration velocity gradient and slider weight per unit area enhanced slider displacement.
- Increased stator vibration velocity amplitude and gradient, decreased slider weight per unit area, and driving frequency enhanced slider speed.
- An optimal slider surface roughness was identified for maximum slider speed.
Conclusions:
- The proposed linear ultrasonic motor effectively utilizes acoustic standing waves for noncontact motion.
- The theoretical model accurately predicts motor performance.
- Design parameters such as stator vibration characteristics, slider weight, surface roughness, and driving frequency can be optimized to control slider displacement and speed.