Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1992-10-16
1994-07-26
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
384448, G01P 3488, F16C 3200
Patent
active
053329643
ABSTRACT:
A rolling bearing unit for sensing rotational speed comprising a rotating inner ring member of a magnetic material with an inner raceway, a stationary outer ring member with an outer raceway to oppose the inner raceway, a plurality of rolling bodies between the inner raceway and the outer raceway so that the inner ring member is rotatable freely relative to the outer ring member, a pulse rotor attached to the rotating inner ring member so as to rotate in a coaxial relationship with the rotating inner ring member during use, a sensor supported on the stationary outer ring member so as to face the pulse rotor and comprising a pole piece of magnetic material facing the pulse rotor, a coil wound around the pole piece, a permanent magnet axially in contact with the pole piece, and a back yoke of a magnetic material with a base end portion axially in contact with the permanent magnet and a tip end portion in proximity to the rotating inner ring.
REFERENCES:
patent: 4069435 (1978-01-01), Wannerskog et al.
patent: 4904936 (1990-02-01), Richmond
patent: 5140261 (1992-08-01), Seo et al.
patent: 5148104 (1992-09-01), Ishikawa
NSK Ltd.
Strecker Gerard R.
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