Electromagnetic torque sensor for a rotary shaft

Details Electromagnetic torque sensor for a rotary shaft Electromagnetic torque sensor for a rotary shaft

1986-12-22

1988-02-16

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

324208, G01L 310

Patent

active

047247100

ABSTRACT:
An electromagnetic sensor for measuring the twist of a rotary shaft in response to the transmission of torque therethrough. Rotary magnetic sleeve means coupled to longitudinally displaced points on the shaft rotate relative to each other in proportion to the shaft deformation. Permanent magnets provide a source of magnetic flux, and a magnetic flux path is defined by a combination of the rotary sleeve means and a segmented stationary sleeve means. Relative rotation of the rotary sleeve means with deformation of the shaft progressively alters the density of the magnetic flux in the segmented stationary sleeve means, and a magnetic flux transducer positioned in an air gap between the stationary sleeve means segments detects the flux density therein to provide an indication of the amount of torque transmitted through the shaft.

REFERENCES:
patent: 3204453 (1965-09-01), Neher
patent: 4119911 (1978-10-01), Johnson, Jr.
patent: 4448275 (1984-05-01), Kitagawa et al.

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