System for measuring torque and speed of rotating shaft

Details System for measuring torque and speed of rotating shaft System for measuring torque and speed of rotating shaft

1980-03-10

1981-12-22

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

7386228, G01L 310

Patent

active

043064620

ABSTRACT:
A magnetic transducer fits over a rotatable shaft and has a primary winding that is a-c energized by an a-c excitation signal to produce a magnetic field, adjacent to the shaft, which changes as the shaft is torsionally stressed when torque is applied thereto. This stressing causes compression and tension in the shaft which alter the shaft permeability and thus vary the magnetic flux pattern in the shaft. The magnetic field is also a function of the shaft speed due to the shaft's armature reaction, eddy currents being generated in the shaft which develop a magnetic field that opposes and distorts the field produced by the primary winding. A pair of secondary windings in the transducer produce differently modulated excitation signals which are then processed to provide a pair of suppressed carrier signals amplitude modulated at different phases by the torque and speed parameters of the shaft. Synchronous detectors are employed to demodulate the suppressed carrier signals to provide separate torque and speed information signals.

REFERENCES:
patent: 4100794 (1978-07-01), Meixner
patent: 4106334 (1978-08-01), Studtmann

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