F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
342/37, 318/98
F04B 49/06 (2006.01) E21B 43/12 (2006.01) H02P 1/02 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1170339
ABSTRACT OF THE DISCLOSURE A motor control circuit for submersible pumps has fea- tures to prevent restarting while the electric motor is back- spinning. 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 re- starting. 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.
399188
Gowling Lafleur Henderson Llp
Hughes Tool Company
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