The submersible electric motor is the prime mover of an electric submersible pumping system. It is supplied with electrical power from surface via the ESP cable and converts this into meaningful mechanical work.Global statistics show that the motor is among the most likely components to cause premature failure of an ESP system. As such, Weatherford is dedicated to ensuring that only the best material and technology is used in our motors, and our application engineers will ensure that the appropriate selections are made for the particular downhole conditions of each well.

Weatherford’s submersible electric motor is a two-pole, three-phase induction motor that operates at 3,500 rpm at 60 Hertz or 2,900 rpm at 50 Hertz. These rugged motors are offered in a wide range of horsepower ratings, operating voltages, special insulating materials for high temperature applications, and high efficiency motor configurations.

As an integral part of a complete system package, Weatherford currently offers the following range of motors:

375 Series
456 Series
540 Series
562 Series

Construction

Our motors are filled with a highly refined mineral oil to provide dielectric strength, lubrication for bearings and thermal conductivity. The motor thrust bearing carries the load of the rotors. Heat generated by the motor is dissipated in the well fluid as it flows by the motor housing.

The precision steel stator laminations focus the magnetic forces on the rotors to reduce the energy loss. The stator windings have been enhanced with increased copper fill and a superior high temperature insulation system. There is an expanded oil reservoir in the base for extra cooling capability.

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