Strain detector

Details Strain detector Strain detector

1991-05-03

1992-03-03

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73779, 324209, G01L 310, G01B 724

Patent

active

050921827

ABSTRACT:
A strain detector wherein the efficiency of a detecting coil is improved to improve the sensitivity of the strain detector. The strain detector comprises a magnetic layer made of a soft magnetic material having a high permeability and fixedly mounted on an outer periphery of a driven shaft strain of which is to be detected, and a detecting coil disposed around the magnetic layer with a gap left therebetween for detecting a variation of the permeability arising from strain of the magnetic layer caused by an external force applied to the driven shaft. The strain detector further comprises a metal layer made of a non-magnetic material having a high electric conductivity and disposed in the gap between the magnetic layer and the detecting coil. Or else, the detecting coil has a pair of coil portions connected to each other by way of an intermediate portion thereof, and an electric current flows in the same direction through the coil portions.

REFERENCES:
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4414855 (1983-11-01), Iwasaki
patent: 4976160 (1990-12-01), Dobler et al.
I. Sasada et al., "Torque Transducers with Stress-Sensitive Amorphous Ribbons of Chevron-Pattern", IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1984.

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