Torque and torsion angle measuring apparatus

Details Torque and torsion angle measuring apparatus Torque and torsion angle measuring apparatus

1980-12-05

1982-11-02

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

336 30, G01L 310

Patent

active

043567320

ABSTRACT:
Measuring apparatus for the torque transmitted through a shaft consists of a first and second induction member respectively mounted at the input and the output end of the shaft for rotation therewith. The induction members are discs or concentric cylindrical elements made of a conductive material, each member having sector-shaped cut-out portions. The sector-shaped cut-out portions of the two members are aligned for a predetermined starting torque. A coil is mounted opposite one of the members and generates a high frequency magnetic field. The magnetic field induces eddy currents in the members. The eddy currents in the second member increase as the conduction material of the second member shifts toward exposure to the coil through the cut-out portions of the first member. Increases in eddy currents cause decreases in inductivity of the coil which, when measured, constitute a measure of the transmitted torque.

REFERENCES:
patent: 3329012 (1967-07-01), Demuth
patent: 3336525 (1967-08-01), Church
patent: 3729991 (1973-05-01), Hardway, Jr.
patent: 3823608 (1974-07-01), Pantermuehl et al.

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