Torque sensor

Details Torque sensor Torque sensor

1985-10-18

1987-12-15

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

7386233, 324209, G01L 310

Patent

active

047124326

ABSTRACT:
A non-contacting, inductively coupled leakage flux torque sensor and method of measuring torque by determining the change in leakage flux at a surface discontinuity as a result of a torsion stress. Two identical, mirror image discontinuities are formed in a ferromagnetic member. The discontinuities may comprise sets of slots or ferromagnetic projections on facing end surfaces of the ferromagnetic member. As a result of torsional stress on the member, the discontinuities change shape and dimension or are displaced, resulting in a change in leakage flux. The change in leakage flux is detected by two differentially connected coils. A modulator-demodulator circuit provides a determination of torque as a function of the changed flux.

REFERENCES:
patent: 2826064 (1958-03-01), Hastings
patent: 3329012 (1967-07-01), Demuth
patent: 4356732 (1982-11-01), Hachtel et al.
patent: 4414855 (1983-11-01), Iwasaki
patent: 4485682 (1984-12-01), Stroezel et al.
patent: 4506554 (1985-03-01), Blomkvist et al.
Artamonov-"Converter of the Torsion Angle of a Shift into Digital Code", Izmer, Tekh., No. 7, pp. 33-35, Jul. 1978.

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