Electrically controlled spring element

Details Electrically controlled spring element Electrically controlled spring element

1988-03-15

1989-02-07

Reger, Duane A.

Spring devices

Miscellaneous

310 26, 367156, F16F 600

Patent

active

048026603

ABSTRACT:
An electrically controlled spring element according to the invention comprises one or more basic spring elements and a mechanical transformer to increase the stretch of the spring element. The basic spring element comprises two mechanically connected elements with an intermediate transmission for power output, each of the elements consisting of a rod pre-magnetized by permanent magnets and consisting of highly magnetostrictive material (Terfenol), a surrounding excitation coil and an outer frame holding the parts together. The magnetic orientation of the pre-magnetization and the coils shall be such that, regardless of the direction of the control current, the electrically controlled excitation is always directed in the same direction as the pre-magnization in one element and is always directed in the opposite direction to the pre-magnetization in the other element.

REFERENCES:
patent: 4158368 (1979-06-01), Clark
patent: 4308474 (1981-12-01), Savage et al.
patent: 4378258 (1983-03-01), Clark et al.
patent: 4438509 (1984-03-01), Butler et al.
patent: 4642802 (1987-02-01), Pozzo et al.
"Giant Magnetostriction Gives More Sensitive Transducers" in Elteknik Med Aktuell Elektronik, 1984:16, p. 57.

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