The heart of an ultrasonic motor is the , usually a piezoelectric ceramic like PZT (Lead Zirconate Titanate). When an oscillating voltage is applied, the stator undergoes high-frequency deformations.
: They can achieve positioning accuracies in the range of tens of nanometers, far exceeding standard DC motors. ultrasonic piezomotors
Ultrasonic piezomotors (also known as ultrasonic motors or piezo motors) are a class of actuators that use the inverse piezoelectric effect to generate high-frequency mechanical vibrations (typically 20 kHz–1 MHz). These vibrations are converted into continuous or stepping motion via friction coupling between a stator and a rotor/slider. Unlike electromagnetic motors, they operate without magnetic fields and can hold position with zero power consumption. The heart of an ultrasonic motor is the
Furthermore, piezomotors excel in precision. They possess an inherent braking capability; when the power is cut, the friction between the stator and rotor locks the mechanism in place without the need for external brakes. This feature, combined with their ability to move in discrete steps of nanometers, makes them ideal for precision optics and semiconductor manufacturing. Additionally, they are immune to magnetic interference, making them suitable for use in MRI machines and other environments sensitive to electromagnetic fields. Ultrasonic piezomotors (also known as ultrasonic motors or
: Because they contain no magnets, they are fully functional in high-magnetic environments like MRI machines.