Electricity: measuring and testing – Magnetic – Displacement
Patent
1992-10-09
1993-07-20
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420713, 32420725, 324174, G01B 715, G01P 348, G01P 354
Patent
active
052297152
ABSTRACT:
A variable reluctance sensor is disclosed as adapted for sensing the rate of revolution of a toothed wheel of magnetic material. The sensor has at least two magnets disposed side by side. One of the magnet has a first pole (e.g. S pole) disposed opposite the toothed wheel, and the other magnet has a second pole (e.g. N pole) disposed opposite the toothed wheel. The second pole of the first mentioned magnet and the first pole of the second magnet are both held against a magnetic core around which a coil is wound. As the teeth of the magnetic wheel successively travel past the magnets, they create magnetic fluxes oriented in opposite directions, which counteract each other in the core. Consequently, the total magnetic flux in the magnetic member varies more greatly than heretofore depending upon whether each magnet is opposed to any one tooth, or to the space between any two neighboring teeth, of the magnetic wheel. Such great variations in magnetic flux are translated into a correspondingly large amplitude signal as by the coil around the core.
REFERENCES:
patent: 3041483 (1962-06-01), Ebbinghaus et al.
patent: 3469662 (1969-09-01), Dewar
patent: 3961214 (1976-06-01), Lokkart
Niino Hiroyuki
Taniai Youichi
Sanken Airpax Ltd.
Snow Walter E.
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