Backspin detection circuit for a submersible pump

Details Backspin detection circuit for a submersible pump Backspin detection circuit for a submersible pump

1981-10-01

1983-10-18

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Terminal voltage or counter-electromotive force of...

318368, 318798, 361 28, 417 45, H02P 318

Patent

active

044108451

ABSTRACT:
A motor control circuit for submersible pumps has features to prevent restarting while the electric motor is backspinning. The circuit includes a sensor for sensing the voltage produced by the residual magnetism in the rotor of the motor while it backspins. The voltage sensed is amplified, then rectified and compared with a reference voltage that is preset. The reference voltage corresponds to a voltage produced during backspinning at a selected maximum amount tolerable when restarting. The DC pulses are filtered to provide a corresponding voltage, then compared to the reference voltage. The control circuit is disabled from allowing a restart, either manual or automatic, when the corresponding voltage is greater than the reference voltage.

REFERENCES:
patent: 3439245 (1969-04-01), Perone
patent: 3728604 (1974-04-01), Grygera
patent: 3875463 (1975-04-01), Reuter et al.
patent: 4000446 (1976-12-01), Vandevier et al.
patent: 4021700 (1977-05-01), Ellis-Anwyl

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