Method and apparatus for measuring and monitoring the rate of rotation of fast running machines
First Claim
1. Apparatus for measuring and monitoring the angular velocity of the shaft of a rotating machine, comprising:
- a plurality of sensors positioned adjacent the shaft of said rotating machine, each of said sensors generating sequential pulses having a period proportional to the angular velocity of said shaft, said pulses being generated at intervals such that, during the period between adjacent pulses from one sensor, pulses are generated by each of the others of said plurality of sensors;
an oscillator for generating reference pulses at a predetermined pulse repetition rate;
a plurality of counting devices coupled to respective ones of said plurality of sensors and to said oscillator, said counting devices counting the number of pulses generated by said sensors; and
an averaging and reciprocal circuit coupled to the outputs of said counting devices for obtaining the average of the outputs of said counting devices and generating the reciprocal thereof, the output of said reciprocal circuit being proportional to the angular velocity of the shaft of said rotating machine in revolutions per unit time.
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Accused Products
Abstract
An apparatus for measuring and monitoring the angular velocity of the shaft of a rotating machine. In this apparatus, a plurality of sensors is positioned adjacent the shaft of the rotating machine for generating sequential pulses with periods proportional to the angular velocity of the shaft. The pulses are generated at intervals such that, during the period between adjacent pulses from one sensor, pulses are generated by each of the other sensors. An oscillator is provided for generating reference pulses at a predetermined pulse repetition rate, and a plurality of counting devices are coupled to respective sensors and to the output of the oscillator for counting the pulses generated by the oscillator. An averaging and reciprocal circuit is coupled to the output terminals of the counting devices for obtaining the average of the counting device outputs and then generating the reciprocal of the average value. The output of the reciprocal circuit is proportional to the angular velocity of the shaft of the rotating machine in revolutions per unit time.
65 Citations
18 Claims
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1. Apparatus for measuring and monitoring the angular velocity of the shaft of a rotating machine, comprising:
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a plurality of sensors positioned adjacent the shaft of said rotating machine, each of said sensors generating sequential pulses having a period proportional to the angular velocity of said shaft, said pulses being generated at intervals such that, during the period between adjacent pulses from one sensor, pulses are generated by each of the others of said plurality of sensors; an oscillator for generating reference pulses at a predetermined pulse repetition rate; a plurality of counting devices coupled to respective ones of said plurality of sensors and to said oscillator, said counting devices counting the number of pulses generated by said sensors; and an averaging and reciprocal circuit coupled to the outputs of said counting devices for obtaining the average of the outputs of said counting devices and generating the reciprocal thereof, the output of said reciprocal circuit being proportional to the angular velocity of the shaft of said rotating machine in revolutions per unit time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. The method of measuring and monitoring the angular velocity of the shaft of a rotating machine having a toothed disc attached thereto, comprising the steps of
sensing the passage of each tooth on said toothed disc at a plurality of positions around the circumference of said disc and generating a pulse each time a tooth passes one of said positions, said positions being selected such that during the period between adjacent pulses from one position, pulses are generated at each of the other of said positions; -
generating reference pulses at a predetermined pulse repetition rate; counting the number of pulses generated at said plurality of positions with respect to the number of reference pulses generated; averaging the number of pulses counted to obtain an average value; and generating the reciprocal of said average value, said reciprocal being proportional to the angular velocity of the shaft of said rotating machine in revolutions per unit time.
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Specification