ESP permanent magnet motors

A superior alternative to induction motors

The permanent magnet motor (PMM) is a three-phase, oil-filled motor with permanent magnets mounted in the rotor. Its unique design enables superior performance, improved efficiency, and higher power factor, resulting in reduced power consumption when compared with standard induction motors.

^† Performance improvement is based on a 4.61-in [117-mm], 322-hp motor configuration compared with previous-generation induction motor technology. Calculations are based on a run life of 365 days with 100% uptime and take into consideration efficiency losses of the power cable, variable frequency or variable speed ESP drive, and transformer.
^‡ The conversion from electricity to CO₂ is based on the IEA Emission Factors 2019 reference of 485.30 g of CO₂/kW.h.

PMMs for ESPs are used with Reda ESP pumps in multiple industries, including oil and gas, mining (for dewatering), and geothermal energy production.

An alternative technology in electrical downhole drives, PMMs are assembled and run in the same way as conventional ESP motors and are suited for most applications.

Reduced energy consumption and emissions

Assessing the power efficiency of ESPs is a practical first step to reducing energy consumption and the resulting emissions during operation. Pumps and motors are the components with the largest impact on energy consumed.

Streamlined installation and real-time monitoring

Our PMMs are filled in a controlled environment with high-temperature synthetic oil to provide dielectric strength, bearing lubrication, and thermal conductivity. The ESP flange connection facilitates reliable motor and protector connections while ensuring a leak-tight seal. MaxLok™ ESP quick-plug motor lead extension (MLE) simplifies making up the pothead to the motor with a plug-in connection that eliminates taping of pothead terminals at the wellsite.

The gauge-ready base is compatible with any Phoenix artificial lift downhole monitoring system sensor for real-time monitoring of ESP and reservoir properties. A temperature sensor connected directly to the motor winding enables monitoring motor-winding temperature in real time through all stages of operation.

PMM safety

SLB has implemented operational standard work instructions globally to enhance the safety of everyone involved in installing, operating, and removing PMMs. Training for your personnel is available on request at our assembly, repair, and test (ART) centers.

Why are PMMs more efficient than induction motors?

PMMs are synchronous electric machines—the rotor rotates at the same speed as the magnetic field in the stator. This synchronous operation reduces losses in the core, resulting in less heating and an expanded operating envelope for the ESP.

For optimal operation, PMMs require a variable speed drive (VSD) with special control algorithms to time the switching of the output transistors and control the current in the motor windings. The incremental cost of upgrading to a VSD is quickly recovered.