Patent ID: 8941351
Filing Date: 2015-01-27
Classification: F03D,F05B,H02P,Y02E

Abstract:
1. An adjustment device for rotor blades of a wind energy installation, comprising: an alternating-current motor configured to adjust the angular position of the rotor blades, a frequency converter including an input configured to receive an input alternating current at a first frequency, the frequency converter being configured to produce a first output alternating current at a second frequency from the alternating current input and to output the output alternating current to the alternating current motor, the first output alternating current being operable to drive the alternating-current motor, a DC voltage source, and an inverter provided separately from the frequency converter and including discrete, analog components, said inverter being configured to convert the voltage provided by the DC voltage source to a second output alternating current and to output the second output alternating current to the alternating-current motor, the second output alternating current being operable to drive the alternating-current motor.