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    • 86. 发明公开
    • LOW LATENCY VARIABLE ROTATIONAL FREQUENCY MEASUREMENTS
    • EP3845912A1
    • 2021-07-07
    • EP20213671.9
    • 2020-12-14
    • Schneider Electric Systems USA, Inc.
    • Saurabh, AnupamMishra, AjayANSARI, Shahid
    • G01P3/489
    • Systems and methods for measuring rotational frequency in rotating machines use variable sliding windows of measurement. The systems and methods count and store the number of internal clock cycles between the start of a measurement interval and each pulse signal from a pulse generator. Rotational frequency is determined by taking a difference between the count for a most recent pulse signal and the count for some previous pulse signal within the measurement interval. The number of pulse signals that have occurred between the most-recent pulse signal and the previous pulse signal represents a window of measurement. This window of measurement, or the size thereof, may then be used along with the count difference to determine the rotational frequency. The window of measurement may then be slid to the counts for next most recent pulse signal and the next previous pulse signal to obtain a new count difference, and so on. The pulses and the associated timestamp values may be written into a circular memory. The size of the measuring window may be adapted according to the current speed. Optionally, a frequency divider may process the sensor signal and pass only every N-th pulse, so that less data have to be stored. N may be optimized to take into account various system parameters.