Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1995-10-19
1997-02-25
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
310168, 32420715, G01P 3488
Patent
active
056062540
ABSTRACT:
A variable reluctance sensor for sensing the rotational speed of a target wheel having teeth, separated by slots, angularly positioned along its periphery is comprised of an elongated core interposed between two permanent magnets which generate additive magnetic flux passing longitudinally through the elongated core. This additive flux is, however, opposed by a longitudinal flux developed by the opposing ends of the permanent magnets. In the absence of surrounding ferromagnetic material, the magnitudes of the opposing longitudinal flux components are essentially equal, resulting in no net longitudinal component of magnetic flux. The elongated core and permanent magnets are encircled by a multi-turn electrical coil which is wound transversely about a longitudinal dimension. A portion of the elongated core and permanent magnets extending beyond the electrical coil are positioned adjacent the periphery of the target wheel and define an air gap therebetween. As the target wheel rotates, the air gap varies, which in turn varies the magnitudes of the opposing longitudinal components of magnetic flux with respect to one another. An output voltage is generated in the electrical coil having an amplitude proportional to the rate of change of the net longitudinal flux magnitude and a frequency proportional to the rotational speed of the target wheel.
REFERENCES:
patent: 3961214 (1976-06-01), Lokkart
patent: 3986118 (1976-10-01), Madigan
patent: 4045738 (1977-08-01), Buzzell
patent: 4200816 (1989-04-01), Hopkins
patent: 4215286 (1980-07-01), Ornee
patent: 4626781 (1986-12-01), Forkel
patent: 4721864 (1988-01-01), Goossens
patent: 4922197 (1990-05-01), Juds et al.
patent: 5023547 (1991-06-01), Pawlak et al.
patent: 5508608 (1996-04-01), Goosens
patent: 5510708 (1996-04-01), Shirai et al.
Quinnette Denise A.
Xie Jinqiang
Conkey Howard N.
General Motors Corporation
Strecker Gerard R.
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