Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-04-23
1991-05-21
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
050178202
ABSTRACT:
A light weight, efficient, and compact piezoelectric rotary union system is provided for joining structures such as space station modules. The system comprises piezoelectric actuators attached to a first structure that engage and rotate a ring attached to a second structure. The actuators position and rotate the ring by non-sliding, smooth walking motion that provides high mechanical efficiency, long life, and negligible electrical noise. Electrical conductors embedded in the ring and the actuator traction surfaces transmit electric currents and signals between the structures. Moderate traction pressure and large contact area substantially eliminate contact heating and associated vacuum welding. The piezoelectric actuators generate relatively large translational forces at relatively low speeds. The absence of conventional rolling bearings eases connection and disconnection of the rotary union. Piezoelectric actuators with integral sensors can control the shape and stress of a relatively light and flexible ring, and can actively reduce or cancel structural vibrations.
REFERENCES:
patent: 3902085 (1975-08-01), Bizzigotti
patent: 4831306 (1989-05-01), Staufenberg
patent: 4884003 (1989-11-01), Hayes
patent: 4928030 (1990-05-01), Culp
Lewis Research Center, "Multihundred-Kilowatt Rotary Electrical-Transfer Device," advertised in NASA Tech Briefs, Mar. 1989.
Budd Mark O.
Dougherty Thomas M.
Field Harry B.
Hamann H. Fredrick
McFarren John
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