Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-10-22
1993-07-20
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, H01L 4108
Patent
active
052296784
ABSTRACT:
An ultrasonic step motor includes a rotor having projections which extend toward a flexible stator. Piezoelectric elements are connected to and spaced along the circumference of the stator. A drive control unit applies driving signals to the vibrators to create nodes and antinodes forming substantially a standing waveform on the stator. The crests of the stator contact the projections of the rotor so as to move the projections of the rotor relative to and toward the nodes of the stator. Drive control circuitry maintains the frequency of the driving signal at the resonant frequency of the stator. The period of time during which the driving signals are applied to the piezoelectric elements is adjusted so as to reduce the power level required to drive the step motor.
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Budd Mark O.
Seiko Epson Corporation
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