Wind turbine with counter rotating rotors

A device for capturing wind energy to produce electrical energy, comprising:

• a vertical mast;
• a nacelle mounted rotatably about a vertical axis on the upper part of the mast;
• a first capture unit including a first turbine rotor having a first hub and at least two first blades fixed to the first hub in generally radial directions, said first hub being mounted rotatably about a generally horizontal axis on the nacelle;
• a second capture unit including a second turbine rotor having a second hub and at least two second blades fixed to the second hub in generally radial directions, said second hub being mounted rotatably about the generally horizontal axis about which said first hub is rotatably mounted so that said first turbine rotor and said second turbine rotor rotate independently of each other and said blades of said second rotor are oriented such that said first rotor and said second rotor counter rotate;
• a first electric generator of discoid shape including a first rotor having one disc-shaped rotor part fixed to the first turbine rotor and a first stator having one disc-shaped stator part fixed on the nacelle so as to face the rotor part of the first rotor;
• a second electric generator of discoid shape including a second rotor having one disc-shaped rotor part fixed to the second turbine rotor and a second stator having one disc-shaped stator part fixed on the nacelle so as to face the rotor part of the second rotor;
• and
• power electronic means for controlling the electric currents produced by said first and said second stators of said first and said second electric generators independently of each other thus regulating the rotational speed of said first turbine rotor and said second turbine rotor.