Torque Control for a Novel Non-Contact Piezoelectric Motor Modulated by Electromagnetic Force

Area of Science:

• Mechanical Engineering
• Electrical Engineering
• Control Systems

Background:

• Piezoelectric motors offer high precision but can suffer from torque fluctuations.
• Electromagnetic modulation presents a novel approach to enhance motor control.

Purpose of the Study:

• To propose and analyze a novel non-contact piezoelectric motor modulated by electromagnetic force.
• To investigate torque modulation mechanisms and develop a compensation strategy for torque fluctuations.

Main Methods:

• Deduction of a magnetic force calculation model for the motor.
• Presentation of equations for magnetic driving torque, keeping torque, total torque, and torque fluctuation.
• Derivation of transfer functions for motor torque and proportional-integral (PI) control.
• Analysis of system parameter effects on gain, time constant, and step responses.
• Determination and implementation of feedback compensation signals for torque fluctuation.

Main Results:

• A calculation model for magnetic forces and associated torque equations were established.
• The effects of system parameters on motor performance metrics like gain and time constant were investigated.
• Step response analysis demonstrated the impact of parameters on motor torque and closed-loop control.
• Compensation control effectively reduced torque fluctuation in the piezoelectric motor.

Conclusions:

• The proposed non-contact piezoelectric motor modulated by electromagnetic force demonstrates effective torque control.
• Compensation strategies successfully mitigate torque fluctuations, improving motor stability and performance.
• The study provides a framework for analyzing and optimizing electromagnetic-piezoelectric motor systems.