Method and apparatus for determining rotational speed

G - Physics – 01 – P

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

354/32

G01P 3/489 (2006.01)

Patent

CA 1172761

ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for providing improved rotation- al 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 refer- ence "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.

397292

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for determining rotational speed does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for determining rotational speed, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for determining rotational speed will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1290034

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.