Torque sensor

Details Torque sensor Torque sensor

1986-11-10

1988-08-23

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

G01L 310

Patent

active

047651920

ABSTRACT:
A torque sensor which includes a pair of multiple thread portions integrally formed in the surface of a rotating shaft in such a manner that one of the multiple thread portions forms a positive angle with the thrust direction of the rotating shaft and the other forms a negative angle with the thrust direction. The threads of the multiple thread portions are at least made of soft magnetic alloy having magnetostrictive properties. A pair of coils are arranged concentrically on the outer side of the multiple thread portions at a given distance therefrom. The strain produced in the surface of the rotating shaft is detected as inductance changes of the coils when the permeability of the soft magnetic alloy changes. The direction and magnitude of the torque are detected because of the difference between the inductances of the coils.

REFERENCES:
patent: 4414855 (1983-11-01), Iwasaki
patent: 4506554 (1985-03-01), Blomkvist et al.

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