REDUNDANT PITCH SYSTEM

摘要

A pitch system for a wind power installation (1) comprising at least one electrically driven pitch drive (18, 19), which is associated with each rotor blade of the installation and has at least one electric motor (M), which is arranged in a rotating part of the installation (1), for blade adjustments, and a power and control unit which is associated with the motor (M) and has line connections (520) for transmission of power and control data from the power and control unit to the motor (M) and vice versa, wherein the line connections (520) are passed via a rotating bushing (Se1), which is arranged at a connecting point between the rotating part and an axially adjacent stationary region, and wherein the system has a further rotating bushing (Se2), which operates mechanically and electrically separately from the first rotating bushing (Se1) and is connected or can be connected to the power and control unit and to the motor (M), in order in this way to maintain reliable transmission of the power and control data if the first rotating bushing (Se1) fails.