Electricity: motive power systems – Automatic and/or with time-delay means – Motor load – armature or primary or secondary circuit current
Patent
1973-02-12
1976-04-27
Smith, Jr., David
Electricity: motive power systems
Automatic and/or with time-delay means
Motor load, armature or primary or secondary circuit current
317 31, 318455, 417 45, H02P 104
Patent
active
039537773
ABSTRACT:
A control circuit for turning off the power to the pump drive motor when the pump has exhausted the supply of liquid in the well. Means for sensing the instantaneous current to the pump motor and a circuit measuring the average current drawn by the pump drive motor, and turning off the power when the average current decreases below a preset level. An RC circuit having a time constant greater than the time required for the pump to complete one full pumping cycle for measuring the average current to the motor, and a comparator controlling switching means to shut off the power when the average current to the motor decreases to a predetermined amount. A reference voltage supplied to the comparator from an amplifier connected to the electrical power in which the output of the amplifier varies inversely to variations of the voltage of the electrical power thereby preventing fluctuations in the supply voltage from adversely affecting the control circuit.
REFERENCES:
patent: 3417290 (1968-12-01), Craddock
patent: 3440512 (1969-04-01), Hubby
Delta-X Corporation
Smith Jr. David
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