Electromagnetic torque measuring instrumentation for a rotating

Details Electromagnetic torque measuring instrumentation for a rotating Electromagnetic torque measuring instrumentation for a rotating

1982-06-14

1984-04-24

Myracle, Jerry W.

Measuring and testing

Dynamometers

Responsive to torque

G01L 310

Patent

active

044440642

ABSTRACT:
A method and apparatus for continuously monitoring torque in a rotating shaft. The invention includes a pair of electromagnetic probes in fixed proximity to the shaft and spaced-apart in the direction of the shaft's longitudinal axis. The probes are operable in two modes. In the first, each probe is excited to cause a fixed magnetic pattern to be induced onto the surface of the shaft along a circumferential line adjacent to the probe. In the second mode, movement of the magnetic pattern due to the shaft rotation induces a signal into each probe. Each signal is indicative of the instantaneous angular velocity of the shaft at the corresponding shaft location. The two induced signals are conveyed to phase detection circuitry which produces a signal indicative of the phase relationship between the two input signals. The electrical phase relationship is a direct measure of the twist in the shaft, proportional to torque.

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patent: 3935733 (1976-02-01), Schindler
patent: 4020685 (1977-05-01), VanMillingen et al.
patent: 4121272 (1978-10-01), Wolfinger
patent: 4186597 (1980-02-01), Brown

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