Patent ID: 7449794
Filing Date: 2008-11-11
Classification: F03D,F05B,Y02E

Abstract:
1. A wind turbine with a self-contained power system, comprising: a nacelle comprising a variable-speed generator directly or indirectly coupled to a hub, a power converter and a wind turbine controller regulating the variable-speed generator using the power converter; a rotor comprising the hub and a plurality of blades, the rotor being driven to rotate and move relatively to the nacelle; and an auxiliary generator disposed on the interface between the rotor side and the nacelle side so as to provide the rotor with sufficient power, the auxiliary generator further comprising: a winding disposed on the rotor side; and an even number of magnetic poles, disposed on the nacelle side facing correspondingly to the winding; whereby, a back electromotive force (emf) is generated in the winding due to the relative motion of the rotor with respect to the nacelle as the rotor is rotating; a power supply with an input terminal capable of receiving the back electromotive force (emf) from the winding and the magnetic poles and converting the back electromotive force (emf) into electric power, wherein the power supply is connected to a back-up power supply capable of storing power.