Driver for piezoelectric motors

A method of supplying switchable AC power to a micromotor comprising:

• connecting a first terminal of an AC power source to one side of the micromotor;
• connected a drain of a Mosfet transistor to a second terminal of the AC power source;
• connecting a source of the Mosfet transistor to the other side of the micromotor and
• selectively supplying power to the load by applying a voltage between a gate of the Mosfet and the second AC terminal.

A micromotor comprising:

• an ultrasonically vibrating element;
• and
• a drive circuit comprising:
• an oscillating voltage source having a high voltage side connected to and electrifying at least one electrode of said ultrasonically vibrating element to cause a mechanical displacement of a portion thereof;
• and
• a discrete switch arrangement not connected to the high voltage side of the voltage source and attached to at least one electrode of said ultrasonically vibrating element, which switch arrangement selects the direction of said displacement.

A micromotor comprising:

• an ultrasonically vibrating element;
• and
• a drive circuit comprising:
• an oscillating voltage source having a high voltage side connected to and electrifying at least one electrode of said ultrasonically vibrating element to cause a mechanical displacement of a portion thereof;
• and
• a discrete switch arrangement attached to at least one additional electrode of said vibrating element that elects the direction of said displacement without switching the high voltage side of the voltage source to or from the at least one additional electrode.