Bazsites.com Ultrasonic Motors

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Ultrasonic Motors - JPL's NDEAA Group work for space application of piezo devices up to year 2000 including commercially available motors.
Cedrat Recherche - Ultrasonic linear piezo motors, drives and actuators. Also dedicated piezo transducer software for motor design.
Institute of Piezomechanics - Ultrasonic actuator and motor research in Kaunas, Lithuania from 1970. Multi degree of freedom motors for robotics.
Flexmotor - Motors and Micromotors - Innovative piezoelectric ultrasonic motor and micromotors for low cost, high volume manufacture for automotive, MEMS and consumer products. Low profile piezomotor and scalable to 2mm diameter.
EMS Products - Miniature stepping motors, ultrasonic motors and controllers.
Piezoelectric Products - EDO Ceramics Corp supplying transducers, actuator and a linear ultrasonic motor
MicroPropulsion Corp (USA) - Ultrasonic motors, piezoelectric transformers, miniature generators.
Surface Acoustic Wave Linear Motor - SAW linear motors. Article describing the principle, experiment and conclusions and future reading.
Electro Mechanical Systems Ltd. - Provides miniature stepping motors, ultrasonic motors and controllers. Contact details and product specification.
Cranfield University - Nanotechnology - Piezoelectric materials, motors, microsystems (MEMS) and actuator design.

Piezoelectric motor - A piezoelectric motor or piezo motor is a type of electric motor based upon the change in shape of a piezoelectric material when an electric field is applied. Piezoelectric motors make use of the converse piezoelectric effect whereby the material produces acoustic or ultrasonic vibrations in order to produce a linear or rotary motion.