Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-03-11
1993-08-17
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, H01L 4108
Patent
active
052372375
ABSTRACT:
An ultrasonic motor comprising a rotor and a stator driven by a piezoelectric element is disclosed. The rotor includes a plurality of gaps which correspond to periods in which piezoelectric sub-element rows are formed. A plurality of level differences on the surface of the stator have rotational symmetry in prescribed periods. Standing waves generated on the stator exert stress on the level differences of non-contact areas of the rotor so as to provide for rotor rest at a relative position where the stress becomes balanced. Stepping operation of the rotor is achieved by movement of the standing waves employing a plurality of level differences with rotational symmetry. The positions where the stress becomes balanced always occur at the same interval thereby facilitating precise stepping operation.
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Furukawa Tsuneaki
Kitahara Joji
Miyazawa Osamu
Ueda Tomoo
Budd Mark O.
Carothers, Jr. W. Douglas
Dougherty Thomas M.
Seiko Epson Corporation
Werner Raymond J.
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