Load indicators for alternating-current motors

Details Load indicators for alternating-current motors Load indicators for alternating-current motors

1981-01-26

1982-06-01

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 23, 361 79, 340648, 324142, H02H 7085, H02H 342

Patent

active

043331181

ABSTRACT:
A load indicator for A.C. motors has an analog multiplying circuit for producing a signal proportional to the product of the current of the A.C. motor and the voltage thereof. From this signal a signal is substracted which is proportional to the absolute value of the motor current. The average value of the differential signal is a measure of the load of the motor which is substantially independent of variations in the motor voltage, provided the proportionality constants are chosen in a suitable manner.

REFERENCES:
patent: 3579217 (1971-05-01), Casey et al.
patent: 3931559 (1976-01-01), McKee
patent: 4079313 (1978-03-01), Callan
patent: 4100587 (1978-07-01), Anderson et al.

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