The new generator can be operated in a wide speed range with a maximum output of 3.6 MW from a 500 mm frame. The efficiency is better than 98%.
The permanent magnet generator is a synchronous machine where the rotor windings have been replaced with permanent magnets. This eliminates the excitation losses in the rotor, which otherwise typically represent 20 to 30 percent of the total generator losses. The reduced losses also give a lower temperature rise in the generator, which means that a smaller and simpler cooling system can be used.
The temperature reduction in the rotor also reduces the temperature in the bearings, improving reliability by increasing the lifetime of the bearings and the bearing grease.
The high efficiency of the generator means better utilisation of the wind energy, producing more electrical power. The reduction in size and weight also makes the construction of the windmill easier as smaller lifting equipment can be used.

This permanent magnet generator, as used in the FuturEnergy turbines, is available separately for use in DIY renewable energy projects.
At the heart of FuturEnergy's 1kW turbines is this Permanent Magnet Generator (PMG). Using high quality rare earth magnets this kicks out very high power outputs at low RPM speeds, and only weighs 7Kg. It has a wide variety of uses, from wind and water turbines, to fuel-powered generators... the limit is your imagination!
Fans of BBC2's It's Not Easy Being Green series may remember the waterwheel they built for their farmhouse - presenter Dick Strawbridge came up with a DIY adaptor to attach their wooden wheel to this very generator!
It comes fitted with 3-phase power output cables (approx 15cm in length) and has a 20mm axle with a "flat" and "recess" for securing, and 5 x 8mm nuts, washers and split rings to fit on the faceplate mounting bolts (shown on the left). Technical sheet is here.
You will need to rectify the output of the 3-phases to produce DC for battery charging and other applications. Though you could build your own rectifier, the PMGs aren't guaranteed for that, so we can supply a 3-phase bridge rectifier kit for 16.20 - select from the drop-down below if you need one.