Magnetically operated non-contact magnetic torque sensor for sha

Details Magnetically operated non-contact magnetic torque sensor for sha Magnetically operated non-contact magnetic torque sensor for sha

1986-04-22

1988-10-25

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Stress in material measurement

73DIG2, 7386236, G01B 724

Patent

active

047806710

ABSTRACT:
A torque sensor includes a cylindrical body disposed concentrically around a shaft and having its opposite ends secured to the surface of the shaft through elastic bodies, a layer of soft magnetic alloy having a magnetostriction property and secured to the surface of the cylindrical body, and a coil disposed concentrically around the layer with an air gap between it and the layer. The torque sensor is constructed such that a strain produced on the surface of the cylindrical body by a torque is converted into a change of a relative permeability of the soft magnetic alloy due to a reverse magnetostriction effect which is detected as a change of inductance of the coil. When the shaft thermally expands or deflects, the elastic bodies act to permit only a torque to be transmitted to the cylindrical body, so that a uniform output is provided without the influence of a thermal strain and deflection of the shaft.

REFERENCES:
patent: 3340729 (1967-09-01), Scoppe
patent: 3465581 (1969-09-01), Hohenberg
patent: 3501950 (1970-03-01), Hohenberg
patent: 4414855 (1983-11-01), Iwasaki
patent: 4485682 (1984-12-01), Stroezel et al.
patent: 4502340 (1985-03-01), Gebben

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