Emergency adjustment device for blade pitch adjustment systems for wind energy installations
AssigneeRobert Bosch GmbH
InventorsStephan Becker, Bernd Spatz
Life of this patent
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Abstract
An adjusting device for rotor blades of a wind power plant is disclosed. An AC motor is provided for adjusting the angle setting of the rotor blades. An input serves for receiving an input alternating current. A frequency converter is provided for generating a second alternating current having a second frequency, wherein the second alternating current drives the AC motor. Additionally, a DC voltage source and an inverter are provided for converting the voltage provided by the DC voltage source into an alternating current for the AC motor. The inverter is thereby separated from the frequency inverter.
Claims15
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.
A wind energy installation, comprising:
- rotor blades;
- and
- an adjustment device including:
- 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, 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.
Dependencies are inferred from the claim text.