Ultrasonic_Motors

Cranfield University - Nanotechnology - Piezoelectric materials, motors, microsystems (MEMS) and actuator design.
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.
Institute of Piezomechanics - Ultrasonic actuator and motor research in Kaunas, Lithuania from 1970. Multi degree of freedom motors for robotics.
MicroPropulsion Corp (USA) - Ultrasonic motors, piezoelectric transformers, miniature generators.
Piezo Ceramic GmbH (Germany) - Ultrasonic motor manufacturer. Also piezo ceramic, PZT transducers and actuators.
Surface Acoustic Wave Linear Motor - SAW linear motors. Article describing the principle, experiment and conclusions and future reading.
Ultrasonic Motors - JPL's NDEAA Group work for space application of piezo devices up to year 2000 including commercially available motors.