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A new standing-wave-type linear ultrasonic motor based on in-plane modes
1Precise Driving Laboratory, Nanjing University of Aeronautics & Astronautics, Nanjing, China. Shiyunlai950438@nuaa.edu.cn
Ultrasonics
|December 28, 2010
Summary
This study introduces a novel ultrasonic motor utilizing combined longitudinal and bending modes. Its unique triangular stator design amplifies displacement, enabling efficient, miniaturized, and cost-effective linear motion.
Area of Science:
- Mechanical Engineering
- Materials Science
- Robotics
Background:
- Ultrasonic motors offer advantages in precision and miniaturization.
- Existing designs often face limitations in displacement amplification and cost-effectiveness.
Purpose of the Study:
- To develop a new standing-wave-type linear ultrasonic motor.
- To enhance displacement amplification using a novel stator design.
- To investigate the motor's performance characteristics and miniaturization potential.
Main Methods:
- A stator was designed using two piezoelectric plates and a metal thin plate, featuring an isosceles triangular structure.
- Numerical analysis was performed to study the influence of the triangular structure's base angle on displacement amplitude.
- Four prototype stators were fabricated and experimentally tested to validate numerical simulations.
Main Results:
- The isosceles triangular structure effectively amplifies horizontal displacement.
- Numerical simulations were validated by experimental results.
- A prototype motor achieved a no-load speed of 98 mm/s and a maximal thrust of 3.2 N at a driving frequency of 53.3 kHz.
- The motor demonstrated effective elliptical motion trajectory with only two piezoelectric transducers.
Conclusions:
- The novel stator design enables efficient displacement amplification and elliptical motion.
- The ultrasonic motor is cost-effective, structurally simple, and suitable for miniaturization.
- This technology holds promise for applications requiring precise linear actuation in compact spaces.
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