Lex Lex Universal Permanent Magnet Motors (UPMM) Technology

Lex Universal Permanent Magnet Motors

We develop and continually improve Lex Universal Permanent Magnet Motor (UPMM) technology - an alternative way to provide rotational energy for electrical submersible pumps. Lex features a product range of Lex UPMM from 85 to 12,000 rpm operating speeds, high efficiency up to 95%, operational flexibility, lower motor heating rise, stable operation at any frequencies, and high-temperature environments (specifically in geothermal wells) up to 392 °F (200 °C).

Lex Universal Permanent Magnet Motors

Lex Universal Permanent Magnet Motors Advantages


PM Motor technology meets the challenges of conserving resources, finding power-saving solutions, operating in depleted fields and optimizing production gain in harsh well conditions. PMM has technical and operational advantages vs. standard asynchronous motors. These include a higher efficiency of 90–95%, lower heat generation and lower energy consumption. The system is also compact and lightweight.

The main difference between permanent magnet motors and asynchronous motors is that the permanent magnets are mounted in the rotor instead of the short-circuited ‘squirrel cage’ to reduce current loss. The Variable Frequency Drive transmits alternate current to the stator coil, and the rotating electromagnetic field attracts the magnet poles to rotate the rotor. The rotor and stator are synchronized to omit slips and magnetic loss. The low starting current reduces the load on the entire electrical system’s power network, extension cable, and insulation materials.

The range of Lex Universal Permanent Magnet Motors includes low-speed submersible motors at 85-1,500 rpm for cavity pumps; standard- and high-speed motors at 2,000-6,000 rpm; motors for Ultra-High-Speed ESP of 1,000-12,000 rpm operating speed; and 86-550 rpm motors for sucker rod pumps.

Lex Universal Permanent Magnet Motors


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    Artificial lift methods are used to operate most of the wells around the world. We design, improve, manufacture, supply, and service advanced artificial lift equipment for any downhole environment. The high quality and reliability of Lex technologies and equipment are assured by our compliance with the requirements of API and NACE / ISO industry standards.

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