Permanent Magnet Direct Drive (PMDD) Technology

Northern Power Systems Permanent Magnet Direct Drive (PMDD) technology is central to the our innovative production system. Permanent magnet generators offer high efficiency energy conversion, especially at load path; they are are lighter, more efficient, and require less assembly work.

The permanent magnet generator has been designed in an integrated manner with the power converter to create a tailor-made solution for high energy conversion efficiency and low maintenance costs. The generator is cooled directly by the wind, without the need for auxiliary fans or air transfer through the generator.

The direct transmission technology without gearbox supplies energy directly to the distribution grid reducing losses to a minimum.

The generator and rotor of our turbines are coupled directly and move together at the same speed. By eliminating the gearbox, we have simplified the transmission system by drastically reducing the number of moving parts and the related wear problems. The innovation induced by the system without the speed multiplier creates direct benefits for our customers in the form of a turbine with higher efficiency and lower maintenance costs.

PMDD - Permanent Magnet Direct Drive