Rotor Blade Pitch Adjustment Device

Abstract

A rotor blade pitch adjustment device for a wind power installation includes a motor/pump unit whose rotation speed and direction are variable and which is connected for fluid-flow purposes to a hydraulic actuator via a hydraulic open-loop/closed-loop control system. The actuator is mechanically coupled to at least one rotor blade of the wind power installation in order to rotate the rotor blade about its longitudinal axis. An electrical control circuit, which comprises an emergency power supply device, is provided for operation of the motor.

1 . A rotor blade pitch adjustment device for a wind power installation, comprising:
 a motor/pump unit which has a variable direction;   a hydraulic actuator which is mechanically coupled to at least one rotor blade of the wind power installation in order to rotate said rotor blade about its longitudinal axis;   a hydraulic open-loop/closed-loop controller configured to fluidically connect the motor/pump unit to the hydraulic actuator; and   an electric control circuit, comprising an emergency power supply device, of the motor/pump unit.   
     
     
         2 . The rotor blade pitch adjustment device as claimed in  claim 1 , wherein the emergency power supply device includes an accumulator or a plurality of capacitors which, in the event of a predetermined drop in voltage in the electric control circuit, are configured to be connected thereto. 
     
     
         3 . The rotor blade pitch adjustment device as claimed in  claim 2 , wherein the emergency power supply device is configured to supply power to the electric control circuit and to the motor/pump unit. 
     
     
         4 . The rotor blade pitch adjustment device as claimed in  claim 1 , further comprising:
 a hydraulic emergency operating device configured to supply the hydraulic actuator with hydraulic pressure energy in the event of a failure or of reduced power of the motor/pump unit.   
     
     
         5 . The rotor blade pitch adjustment device as claimed in  claim 1 , wherein the hydraulic actuator is a hydraulic piston cylinder unit. 
     
     
         6 . The rotor blade pitch adjustment device as claimed in  claim 1 , wherein the motor/pump unit is configured to be controlled with a variable rotational speed by means of the electric control circuit. 
     
     
         7 . The rotor blade pitch adjustment device as claimed in  claim 1 , wherein the hydraulic piston cylinder unit includes three chambers. 
     
     
         8 . The rotor blade adjustment device as claimed in  claim 7 , wherein, in an emergency operation, hydraulic fluid from a pressure accumulator, is applied exclusively to one of the chambers in order to rotate the at least one rotor blade into its windmilling position, while hydraulic fluid can be applied to at least two further chambers in order to rotate the at least one rotor blade out of and in the direction of its windmilling position in a regular operation. 
     
     
         9 . The rotor blade pitch adjustment device as claimed in  claim 8 , wherein the hydraulic emergency operating device is connected exclusively to the one chamber via a  2 / 2  directional control valve which is configured to be opened electromagnetically.