Measuring and testing – Dynamometers – Responsive to torque
Patent
1991-04-17
1992-04-21
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
73779, 324209, 505842, 505872, G01L 310, G01B 724
Patent
active
051056674
ABSTRACT:
In a strain measuring device employing a magnetic permeability detector means to detect an amount of strain in a passive member as changes of magnetic permeability in a magnetostrictive layer, a magnetic shielding layer is formed on the surface of the passive member, and the magnetostrictive layer is formed thereon so as to lessen the adverse effects of the passive member caused by the magnetic characteristics of the passive member in strain measurement, that is, to reduce measurement errors. Alternatively, a magnetostrictive layer is formed on the surface of the passive member, or a magnetic shielding layer is partially formed on the surface of the passive member of a soft magnetic material with high permeability, so as to lessen the influence of the passive member caused by thermal stresses of the passive member in strain measurement, that is, to reduce measurement errors. Further, there is provided a strain measuring device which facilitates formation of the magnetostrictive layer.
REFERENCES:
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4805466 (1989-02-01), Schiessle et al.
Satoh Hiroshi
Utsui Yoshihiko
Mitsubishi Denki & Kabushiki Kaisha
Ruehl Charles A.
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