Variable reluctance rotation sensor with changing flux linkages

Details Variable reluctance rotation sensor with changing flux linkages Variable reluctance rotation sensor with changing flux linkages

1989-11-08

1991-06-11

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

188181R, 310155, 310168, 32420715, G01P 3488, H02K 2138

Patent

active

050235478

ABSTRACT:
A variable reluctance rotation sensor comprises a rotatable toothed wheel and a magnetic pickup assembly comprising a pair of permanent magnets each having a pair of poles with an opposite one of said poles adjacent the toothed wheel. The permanent magnets are separated from each other by an arc equal to the arc between two of the teeth and joined by a magnetic flux member with a multi-turn electrical coil wound thereon. The flux member establishes a common main flux loop through the first and second permament magnets but also extends close to the toothed wheel to further establish additional flux loops separately through each of the permanent magnets. Passage of alternating teeth and slots as the wheel rotates produces a spatial fluctuation in the additional flux loops between the magnets to vary the flux linkages with individual coil turns and increase the electrical signal in the coil over the signal level that would be produced by variations in air gap of the common flux loop alone. The sensor produces a rotational speed signal at very low rotational speeds of greater amplitude and/or with a larger minimum air gap than that of conventional variable reluctance sensors.

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Pawlak and Shirai, "Variable Reluctance Sensor", Research Disclosure No. 296, p. 961, Dec. 1988, General Motors.

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