G - Physics – 01 – L
Patent
G - Physics
01
L
73/69
G01L 5/26 (2006.01) G01L 3/10 (2006.01) G01L 3/24 (2006.01) G01P 3/44 (2006.01) G01P 3/49 (2006.01)
Patent
CA 1169679
078210-BW1 SYSTEM FOR MEASURING TORQUE AND/OR SPEED OF ROTATING SHAFT Abstract: A magnetic transducer (10) fits over a rotatable shaft (11) and has a multi-pole magnetic core (30), one primary winding (46) being wound on half of the poles while a second primary winding (47) is wound on the other half. Direct current pulses are alternately supplied to the two primary windings to provide a-c excitation for producing an alternating magnetic flux or field, adjacent to and within 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 resulting 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 counter magnetic field that opposes and distorts the field produced by the two primary windings. A secondary circuit (51,52) in the transducer (10), comprising a pair of secondary windings (38,42) each wound on a separate magnetic core (31,32), responds to the resulting magnetic field and provides information signals relative to the torque and speed characteristics of the rotating shaft.
421808
Borg-Warner Corporation
Macrae & Co.
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