Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1989-08-18
1991-07-16
Wieder, Kenneth
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420716, 32420722, 32420725, G01P 344
Patent
active
050327909
ABSTRACT:
A magnetic speed sensor is provided with a uniquely-shaped pole piece and is utilized in conjunction with a uniquely-shaped exciter ring. The sensor includes a magnet which is positioned at one end of the pole piece. In accordance with the present invention, the pole piece is provided with three sections, each of which are shaped and have a cross-sectional configuration designed to optimize the output of the speed sensor. In particular, the pole piece includes an inner end portion, and intermediate portion, and an outer end portion. The inner end portion of the pole member, which is positioned adjacent one end of the magnet, has a cross-sectional configuration generally corresponding to the cross-sectional configuration of the one end of the magnet. The intermediate portion of the pole piece has a cross-sectional configuration generally corresponding to the cross-sectional configuration of an aperture in an insulating bobbin which coaxially supports a coil around the pole piece. Finally, the outer end of the pole piece is designed with a rectangular cross-sectional configuration which is sized in accordance with the shape of the exciter ring teeth. The exciter ring is provided with a plurality of circumferentially spaced teeth members having an outer tip portion with a semi-cylindrical configuration.
REFERENCES:
patent: 3719841 (1973-03-01), Ritsema
patent: 3942045 (1976-03-01), Palazzetti
patent: 4196390 (1980-04-01), Pitkin
patent: 4611168 (1986-09-01), Kudelski et al.
patent: 4652818 (1987-03-01), Buschmid et al.
Harvey Jack B.
Kelsey-Hayes Company
Wieder Kenneth
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