Development of a Rotary Ultrasonic Motor with Double-Sided Staggered Teeth

Area of Science:

• Mechanical Engineering
• Materials Science
• Robotics

Background:

• Conventional traveling wave ultrasonic motors have limitations in torque output and actuation capabilities.
• Integrating piezoelectric ceramic chips within stator teeth presents design challenges.
• Dual-rotor systems offer potential for increased performance in rotary actuators.

Purpose of the Study:

• To propose and analyze a novel rotary ultrasonic motor with a double-sided stator featuring staggered teeth.
• To investigate the feasibility of utilizing both sides of the stator for actuating rotors.
• To evaluate the performance characteristics of the proposed motor design.

Main Methods:

• Design and fabrication of a prototype rotary ultrasonic motor with double-sided staggered teeth.
• Finite element method (FEM) analysis to simulate motion trajectories of stator driving tips.
• Experimental testing to determine load-free speed and maximum output torque at various operating conditions.

Main Results:

• The proposed motor successfully generated a traveling wave in the ring-like stator under dual-voltage excitation.
• FEM analysis confirmed the effectiveness of the staggered teeth design for accommodating piezoelectric elements.
• Experimental results demonstrated a load-free maximum speed of 99 rpm and a maximum output torque of 0.19 N·m at 150 Vp and 28.25 kHz.

Conclusions:

• The double-sided stator rotary ultrasonic motor with staggered teeth is a viable design for enhanced actuation.
• The dual-rotor configuration effectively utilizes both sides of the stator to produce torque.
• The motor exhibits promising performance characteristics suitable for various rotary motion applications.