Electrical generator or motor structure – Dynamoelectric – Reciprocating
Reexamination Certificate
2000-08-24
2001-09-25
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Reciprocating
C310S083000
Reexamination Certificate
active
06294849
ABSTRACT:
The present invention relates generally to the modification of operational characteristics associated with magnetostrictive actuators.
BACKGROUND OF THE INVENTION
Magnetostrictive actuators are generally known in the art, as disclosed for example in U.S. Pat. No. 5,451,821 to Teter et al. Such an actuator having a magnetostrictive rod as its active component is provided with magnetic field bias adjustment to optimize operation for single fixed external loads. It is therefore an important object of the present invention to provide the foregoing type of magnetostrictive actuator with means for optimizing the operating characteristics thereof in accordance with ambient variation of loading, such as external pressures applied for example to sonar transducer types of actuators associated with marine vessels during travel through pressure exerting water between shallow and deep water depths.
SUMMARY OF THE INVENTION
In accordance with the present invention, two cylindrical shells having magnetic segments concentrically positioned about the magnetostrictively active rod of the actuator are utilized to modify the adjustable bias of a magnetic field imposed on the active rod by a surrounding magnetic flux generating coil positioned within a solid cylindrical shell through which the magnetostrictively active rod extends. The radially outer segmented shell has rotary gearing fixed thereto for angular displacement of the outer shell segments relative to the segments of the other radially inner shell that is held fixed together with a third segmented, flux return shell within which the other shells are concentrically positioned about the active magnetostrictive rod. Angular displacement of the shell to which the rotary gearing is fixed, is effected through linear drive gearing on a transfer rod axially displaced in response to changes in external pressure loading to correspondingly control modification of the flux bias of the magnetic field to which the active magnetostrictive rod is exposed.
REFERENCES:
patent: 2096906 (1937-10-01), Lilja
patent: 3523204 (1970-08-01), Rand
patent: 3814962 (1974-06-01), Baermann
patent: 5451821 (1995-09-01), Teter et al.
Perez Guillermo
Ramirez Nestor
Shuster Jacob
The United States of America as represented by the Secretary of
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