Induction motor load monitor and control apparatus

Details Induction motor load monitor and control apparatus Induction motor load monitor and control apparatus

H - Electricity

02

P

324/17

H02P 7/00 (2006.01) G01R 31/34 (2006.01)

Patent

CA 1078016

INDUCTION MOTOR LOAD MONITOR AND CONTROL APPARATUS Abstract of the Disclosure Induction motor load conditions are monitored by sensing the slip speed of the motor which is linear over a large operating range including the 100% load condition. Electronic trigger pulses are derived from motor shaft rotation to operate a one-shot waveform generator having a selected signal pulse time duration set at the 100% motor load condition to produce a 3.5 millisecond difference from the time between two trigger pulses. Thus, as the slip speed varies the signal pulse duration varies and thus becomes a monitor of the load condition. Both analog and digital embodiments are described, and utilization devices may be an analog meter display or an alarm circuit triggered by means of an intervening threshold comparison circuit. The Specification follows:

274706

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