Magnetostrictive element

Details Magnetostrictive element Magnetostrictive element

1992-12-02

1994-10-18

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnetostrictive-type device

367156, 367168, 381190, 310 26, 73570, H01F 700, G04F 500, H04R 2500, H01L 4106

Patent

active

053572327

ABSTRACT:
A magnetostrictive element includes a magnetostrictive member, an outer magnet disposed coaxially about, spaced apart from, and surrounding the magnetostrictive member, and a soft magnetic yoke for magnetically coupling the magnetostrictive member and the outer magnet to form a closed magnetic circuit. The magnetostrictive member may be either solid or hollow. In the latter case, an inner magnet is disposed coaxially within the magnetostrictive member for producing a biased DC magnetic field. An axial length of the outer magnet is made shorter than an axial length of the magnetostrictive member. In either case, the outer magnet is spaced apart from the magnetostrictive member so that a more uniform magnetization distribution is produced in the magnetostrictive member.

REFERENCES:
patent: 2435487 (1948-02-01), Adler
patent: 3256738 (1966-06-01), Giacomo
patent: 3274540 (1966-09-01), Melhart
patent: 3283184 (1966-11-01), Brown
patent: 3346841 (1967-10-01), Weichart
patent: 3939448 (1976-02-01), Garshelis
patent: 4845450 (1989-07-01), Porzio et al.

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