Apparatus for detecting torque of rotating shaft

Details Apparatus for detecting torque of rotating shaft Apparatus for detecting torque of rotating shaft

1990-04-17

1991-11-05

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

G01L 310

Patent

active

050623060

ABSTRACT:
A torque detecting apparatus comprises an annular bobbinless sensor coil disposed on a rotatable shaft, and a position adjustable, non-ferromagnetic metal core member disposed adjacent the sensor coil. When the shaft is twisted, the core member moves in a hollow space defined by the sensor coil to thereby change inductance thereof in accordance with angular displacement between the sensor coil and the core member. A detecting part is disposed in opposition to a solenoid coil wound on the shaft with a gap therebetween for detecting the angular displacement in terms of a change in an oscillation frequency. A sensor set is constituted by the sensor coil and the metal core. A pair of sensor sets may be disposed, wherein one sensor set is so connected that inductance of the associated sensor coil is decreased while the other sensor set is so connected that inductance of the associated sensor coil is increased. Difference or ratio between the two oscillation frequencies may be inputted to a resonance circuit.

REFERENCES:
patent: 3906787 (1975-09-01), Wingbermuhle
patent: 4637265 (1987-01-01), Fiori, Jr.

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