Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-03-30
1994-10-25
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310344, H01L 4108
Patent
active
053592522
ABSTRACT:
An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated.
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Bergum John W.
Swift Charles D.
Dougherty Thomas M.
Gaither Roger S.
Moser William R.
The United States of America as represented by the United States
Valdes Miguel A.
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