A system for pumping fluid from a well has a submersible pump introducible
into a well for pumping fluid from the well to ground, submersible motor
introducible into the well and connected to the submersible pump for
driving the submersible pump, the motor including at least one upper
tandem motor mechanically connectable to another motor and electrically
connectable to a power source, and at least one additional upper tandem
motor, the additional upper tandem motor being mechanically connected with
the first mentioned upper tandem motor so as to drive the submersible pump
with a mechanical power derived from the first mentioned upper tandem
motor and the additional upper tandem motor, and a power supply which
independently supplies electrical power to the upper tandem motors.
