Design of single-phase driven screw-thread-type ultrasonic motor

Area of Science:

• Mechanical Engineering
• Robotics
• Materials Science

Background:

• Traditional screw-thread ultrasonic motors typically require two-phase driving circuits.
• Simplifying the driving mechanism is crucial for broader adoption and reduced complexity in ultrasonic motor applications.

Purpose of the Study:

• To present a novel single-phase driven screw-thread-type ultrasonic motor design.
• To simplify the driving circuit complexity of ultrasonic motors.
• To enhance the performance of screw-thread ultrasonic motors through an improved stator design.

Main Methods:

• Designed an asymmetric stator to generate two orthogonal bending modes for single-phase driving.
• Utilized ANSYS finite element analysis (FEA) to analyze the vibration characteristics of the asymmetric stator.
• Fabricated and experimentally tested a prototype of the single-phase driven ultrasonic motor.

Main Results:

• The asymmetric stator design improved vibration displacement and motor performance.
• The prototype operated at a working frequency between 28.3 and 29.5 kHz.
• Achieved a maximum no-load velocity of approximately 4.1 mm/s and a thrust force of 1.6 N at 200 Vpp.

Conclusions:

• The proposed single-phase driven design significantly simplifies the driving circuit for screw-thread ultrasonic motors.
• The novel asymmetric stator design effectively enhances motor performance.
• The developed prototype demonstrates practical feasibility and promising performance characteristics for single-phase ultrasonic motors.