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Windmill alternator

A windmill or wind turbine alternator  is an electrical machine making the conversion from mechanical energy to electrical energy in a windmill or wind turbine (see that word). The alternator is by principle a multiphase AC synchronous machine and more particularly a 3 phase machine delivering a balanced system of AC voltages and currents, in which both statoric and rotoric magnetic fields are rotating synchronously that is to say at the same speed. Therefore it is an AC electrical generator. The excitation of the alternator or inductor can be made by coils with DC currents implemented on the rotor or much more frequently nowadays by permanent magnets bonded to the rotor. There are structures of windmill alternators with internal rotor and external stator on one hand and structures of windmill alternators with internal stator and external rotor on the other hand. However, the windmill  alternators with external stator are more performing in terms of power-to-weight and torque-to-weight because the cooling of statoric windings is easier when the stator is in contact with the air. The ALXION STK alternators have external stator and internal rotor and are excited by strong rare earth permanent magnets at the rotor.

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