Induction motor load monitor and control apparatus

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

1976-04-12

1977-12-13

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

340271, 318490, 324161, G08B 2100

Patent

active

040631125

ABSTRACT:
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 monitoring circuits are used to sense variations of speed and indicate on a meter a scale factor of load or horsepower, etc. as related to various drive means without interconnections other than shaft speed detectors.

REFERENCES:
patent: 3525026 (1970-08-01), Ahamed
patent: 3611343 (1971-10-01), Schoenbach
patent: 3739367 (1973-06-01), Fathauer
patent: 3906796 (1975-09-01), Dumbeck
DC Motor Speed Control, IBM Tech. Disc. Bulletin, D. E. Brownbeck vol. 13, No. 1, June 1970.

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