Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1982-02-16
1984-05-22
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324165, G01P 348, G01P 354
Patent
active
044504039
ABSTRACT:
A method and apparatus are disclosed for providing improved rotational speed determination for a rotating shaft. Two probes positioned adjacent a circular disk which rotates with the shaft scan markings on the disk and generate four out-of-phase signals in response to rotation of the shaft. A switch, controlled by logic circuitry which detects intersections of the signals, develops a composite saw-tooth-shaped signal from the four signals. A counter counts the number of crossings of the composite signal with a reference "zero" value to develop a determination of the number of discrete angular positions traversed by the shaft during a specified time interval. A memory stores the value of the composite signal at the start of the time interval. Computation circuitry develops a rotational speed based on the counted number of positions, corrected by a factor derived from the difference between the stored value and the value of the composite signal at the end of the interval. Time control circuitry prevents the start or end of the time interval during switching and prevents switching during the start or end of the time interval.
REFERENCES:
patent: 4228396 (1980-10-01), Palombo
Dreiseitl Walter
Koch Manfred
Linden Wilhelm
Krawczewicz Stanley T.
Milde Jr. Karl F.
Rodau Andrew G.
Siemens AG
Solis Jose M.
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