GRUNDFOS PERMANENT MAGNET 6” SUBMERSIBL WHY USE A PERMANENT MAGNET MOTOR? As the name indicates, a permanent magnet (PM) motor is based on the use of permanent magnets. A PM motor is in many ways like traditional asynchronous induction motors. The difference is in the rotor (the rotating part of the motor), which is fitted with permanent magnets, resulting in close-to-zero rotor losses. Without rotor losses – which is equal to energy loss – PM motors will run at synchronous speed; for example, 3,000 rpm. Reducing rotor losses increases motor efficiency compared to asynchronous motors, and the lower operating temperature results in longer expected lifetime. However, compared to the asynchronous motor, permanent magnet motors generally require a frequency converter as it cannot start directly from the electricity network. STAINLESS STEEL TUBE SHAFT • Optimal internal circulation of motor fluid • Optimal lubrication of shaft seal FULL STAINLESS STEEL CONSTRUCTION Material variants • EN 1.4301/AISI304 • EN 1.4539/AISI904L HIGH-THRUST CAPACITY • Michell-type thrust bearing • Quick build-up of water film during start-up to ensure high thrust capacity 4
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