Wind power is one of the cheapest forms of energy available to us, because it mainly depends on wind’s speed, and it works 24/7, with no dependence on the moment of the day. A new company called ExRo Technology, based in Vancouver, BC, wants to commercially develop a new type of generator to be used in wind turbines all over the world. The interesting fact is that this new generator can increase the electricity output by 50%.
While normal generators can produce electricity with an efficiency of 90%, this can go lower when the wind speed varies. This happens because the current generators use the same number of coils around the magnetic shaft, a fact that reduces the efficiency at low speeds. The newly invented generator can couple and uncouple the coils surrounding the rotor, so that efficiency is kept to a reasonable figure.
Basically, the generator should look like this:
The company is currently testing small generators like these in their own labs, and are going to test 5kW units in open space. Their next step, though, is to install megawatt-sized generators on actual already-built wind turbines. This add-on could bring the wind energy companies 57% more profits yearly, and the consumer a cheaper energy source.