Piezoelectric motors

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Crystals
Quartz SiO2
Berlinite AlPO4
Gallium orthophosphate GaPO4
Tourmaline
Ceramics
Barium titanate BaTiO3
Lead zirconate titanate PZT

Other materials
Zinc oxide ZnO
Aluminum nitride AlN
Polyvinylidene fluoride PVDF
More piezo materials

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Sensors
Ultrasonic transducers
Piezoelectric motors
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Piezoelectric motors

A piezo motor is based on the change in mechanical shape of a piezoelectric material when an tension is applied.

The material produces ultrasonic or acoustic vibrations and produces a linear or rotary motion.

A few design exists currently:

Locking mechanisms

Stepping Actions

Single Action

With a fast response of the material (up to 5Mhz), it is possible to obtain a linear speed of 800mm/second.

According to manufacturers, precision can be of a few nanometers.