Low Profile Triangle-Shaped Piezoelectric Rotary Motor

Area of Science:

• Materials Science
• Mechanical Engineering
• Electrical Engineering

Background:

• Piezoelectric motors offer advantages in precision and miniaturization.
• Developing efficient and compact rotary actuators remains a key challenge in micro-robotics and instrumentation.

Purpose of the Study:

• To design and investigate a novel low-profile piezoelectric rotary motor.
• To analyze the performance characteristics of a triangle-shaped stator piezoelectric motor.

Main Methods:

• Utilized piezoelectric bimorph plates forming an equilateral triangle stator.
• Induced vibrations using a sawtooth electric signal near the resonant frequency.
• Analyzed motion trajectories and performance via numerical and experimental methods.

Main Results:

• The motor operates at 21.18 kHz with a maximum speed of 118 RPM at 200 V_p-p.
• Achieved an output torque of 18.3 mN·mm.
• Demonstrated high torque-to-weight (36 mN·mm/g) and speed-to-weight (28.09 RPM/g) ratios.

Conclusions:

• The novel triangle-stator piezoelectric motor exhibits promising performance for compact rotary applications.
• The design leverages asymmetrical excitation and resonant vibrations for efficient motion.
• The high power-to-weight ratios suggest suitability for weight-sensitive systems.