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Piezoelectric Motors

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About Piezoelectric Motors

Piezoelectric motors use a piezoelectric ceramic element to produce ultrasonic vibrations of an appropriate type in a stator structure. The elliptical movements of the stator are converted into the movement of a slider pressed into frictional contact with the stator. The consequent movement may either be rotational or linear depending on the design of the structure.  Linear piezoelectric motors typically offer one degree of freedom, such as in linear stages.  However, these devices can be combined to provide more complex positioning factors.  Rotating piezoelectric motors are commonly used in sub-micrometric positioning devices. Large mechanical torque can be achieved by combining several of these rotational units.

Piezoelectric motors have a number of potential advantages over conventional electromagnetic motors. They are generally small and compact when compared with their power output, and provide greater force and torque than their dimensions would seem to indicate.  In addition to a very positive size to power ratio, piezoelectric motors have high holding torque maintained at zero input power, and they offer low inertia from their rotors providing rapid start and stop characteristics.  Additionally, they are unaffected by electromagnetic fields, which can hamper some other motor types.

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Products & Services Related to Piezoelectric Motors

Piezoelectric Actuators
Piezoelectric actuators are devices that produce a small displacement with a high force capability when voltage is applied. 
Piezoelectric Devices
Piezoelectric devices generate electrical signals in response to vibrations and produce mechanical energy in response to electrical signals. Device types include actuators, motors, sensors, and transducers.
Piezoelectric Drivers and Piezoelectric Amplifiers
Piezoelectric drivers and piezoelectric amplifiers are power sources that provide the high voltage levels needed to drive other piezoelectric devices such as actuators, motors, transducers, and sensors.

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Engineering Web: Piezoelectric Motors

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Piezoelectric Operated Actuators And Motors - A Global...
study focuses on key piezoelectric operated actuators and motors and provides data about the size and growth of the piezoelectric operated actuators
See Electronics.ca Publications Information
USM at the JPL's NDEAA
Motor System Using A Series of Connected Individual Motors and a Stack of Piezoelectric Drivers," NTR, Item No. 9447, Docket 19835, Nov. 14, 1995
Nondestructive Evaluation and Advanced Actuators Technologies
Examples of these mechanisms include ultrasonic and surface acoustic wave motors and piezoelectric pumps that are driven by traveling flexural waves.
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