Strain detector with magnetostrictive elements

Details Strain detector with magnetostrictive elements Strain detector with magnetostrictive elements

1989-12-01

1991-01-22

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

G01L 310

Patent

active

049861379

ABSTRACT:
A strain detector for detecting a strain developed in a shaft applied with a torque comprises strain-sensitive magnetostrictive elements attached to the shaft in two groups in a chevron pattern. A pair of annular detection coils are wound around a bobbin to surround respective one of the groups of magnetostrictive elements. Two annular yokes made of a soft magnetic material of high permeability are disposed around respective coils across radial gaps. A hollow cylindrical shield of non-magnetic material with a high electrical conductivity is disposed around the two yokes across radial gaps. The magnetostrictive elements may be made of a nickel-iron alloy of 45 to 55% Ni-Fe. The yokes may be made of a nickel-iron alloy of about 80% Ni-Fe or alternatively, of a 6.5% Si-Fe steel. The detector may comprise a second magnetic shield disposed around the first shield of non-magnetic material with a high electrical conductivity. The second shield may be made of the same magnetic material as the yokes.

REFERENCES:
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4414855 (1983-11-01), Iwasaki
patent: 4651573 (1987-03-01), Himmelstein
patent: 4765192 (1988-08-01), Hase et al.
IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1984, pp. 951-953, in "Torque Transducers with Stress-Sensitive Amorphous Ribbons of Chevron-Pattern" (Sasada et al.).

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