Abstract: A variable frequency power system with a power source having a rotating output and a speed control to regulate rotational speed of the rotating output. A generator coupled to and driven by the rotating output of the power source, whereby the speed control of the power source directly controls output power frequency of the generator due to control of rotational frequency of the rotating output. A voltage regulator connected between the generator and the motor regulates output voltage from the generator to the electrical motor load. A system controller controls output power frequency of the generator. The system controller interfaces with the speed control of the power source and configured to monitor generator output and operational conditions of the electrical motor load. The system controller adjusts the speed control based on generator output and operational conditions of the electrical motor load.

Abstract: 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.

Abstract: 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.