Wind turbine drive system and wind turbine
AssigneeNabtesco Corporation
InventorsOsamu Nohara, Haruna Osako
Life of this patent
Estimating the term…
Abstract
A wind turbine drive system includes a plurality of drive devices, a state quantity detection unit, and a control unit. The plurality of drive devices are provided in a first structure (a nacelle), and a ring gear is provided in a second structure (a tower). Each of the drive devices includes a motor drive portion, a speed reducing portion, and a motor braking portion for braking the motor drive portion. The state quantity detection unit detects a load between a meshing portion of each of the drive devices and the ring gear. Based on the thus detected load for the each of the drive devices, the control unit controls at least one of the motor drive portion and the motor braking portion so as to reduce a degree of variation in the load among the drive devices.
Claims9
A wind turbine drive system, comprising:
- a plurality of drive devices provided in a first structure and including a meshing portion meshing with a ring gear provided in a second structure, the first structure and the second structure being configured to rotate relative to each other, each of the plurality of drive devices including:
- a motor drive portion for outputting power;
- a speed reducing portion for receiving the power transmitted from the motor drive portion;
- and
- a motor braking portion for braking the motor drive portion;
- a state quantity detection unit for detecting, for each of the plurality of drive devices, a load between the meshing portion of the each of the plurality of drive devices and the ring gear;
- and
- a control unit for controlling the motor drive portion, the motor braking portion, or the motor drive portion and the motor braking portion of each of the plurality of drive devices based on the load for the each of the plurality of drive devices detected by the state quantity detection unit, so as to reduce a degree of variation in the load among the plurality of drive devices,
- wherein in a state where the motor braking portion of each of the plurality of drive devices is applying a braking force to the corresponding motor drive portion, the control unit reduces the degree of variation in the load among the plurality of drive devices by controlling at least the motor braking portion of a drive device for which the load is largest among the plurality of drive devices to weaken the braking force thereof,
- wherein the at least the motor braking portion of the drive device that is configured to be controlled is controlled so as to provide the braking force that is smaller than the braking forces provided by each of the other motor braking portions, and
- wherein a predetermined value of the braking force provided by each of the motor braking portions is predetermined, and the braking force is weakened so as to be weaker than the predetermined value.
Dependencies are inferred from the claim text.