Variable reluctance rotation sensor with changing coil linkages

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

050235460

ABSTRACT:
A variable reluctance rotation sensor comprises a rotatable magnetic toothed wheel adjacent a fixed magnetic pickup assembly. The pickup assembly comprises a pair of permanent magnets, each with a similar pole adjacent the wheel and separated circumferentially by the arc between a tooth and a non-adjacent slot. A magnetic flux member with a coil joins the other poles of the magnets in series opposed relationship and extends in close proximity to the tooth wheel to establish separate flux loops for each magnet distributed along the coil. The flux loops are spatially determined by the teeth and slots between the permanent magnets, so that they fluctuate circumferentially and generate an electrical signal in the coil with wheel rotation by variation of the flux linkages to individual turns of the coil. The sensor thus uses spatial flux changes to produce a rotation signal at very low rotational speeds with a larger air gap than that of conventional sensors.

REFERENCES:
patent: 2304866 (1942-12-01), Wall
patent: 3469662 (1969-09-01), Dewar
patent: 3947711 (1976-03-01), Presley et al.
patent: 3961214 (1976-06-01), Lokkart
patent: 4687961 (1987-08-01), Horber
patent: 4713570 (1987-12-01), Mastromattei
patent: 4772815 (1988-09-01), Harned et al.

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