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New submersible Flowserve motor uses permanent magnet technology

Flowserve Corp., a Texas, US-based provider of flow control products and services, has introduced a new submersible electric motor that utilises permanent magnet technology.

Based on the Pleuger three-phase, AC, squirrel-cage induction motor, the new Pleuger PMM8 features advantages over asynchronous designs, including higher efficiency at full and partial loads, lower thermal losses and a large air gap configuration.

The motor can reduce energy costs by up to 10% and boost power output by more than 100% while extending the overall life of the motor, Flowserve reports.

The PMM8 motor technology has demonstrated over 93% efficiency, making it one of the most efficient 8” submersible motors.

Operated in conjunction with variable frequency drives, the PMM8 runs at synchronous speed with no rotor losses, which allows the pump to run at a high efficiency point under variable flow conditions.

Due to the high power output, in many cases the 8” PMM8 design can be substituted for conventional 10” asynchronous motors.

The PMM8 is currently available in a 190mm (8”) motor size with power output of 50kW (67hp) to 200kW (268hp), and Flowserve intends to release additional sizes in the future.