Horizontal axis wind turbine
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorShigeo Yoshida
Life of this patent
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Abstract
This horizontal axis wind turbine comprises a plurality of yaw motors that are provided on one of either a nacelle or a tower, and a gear 2 that is provided on the other of either the nacelle or the tower and that engages with the drive gears 4m, 4n of the plurality of yaw motors, such that when the plurality of yaw motors stop the rotation of the nacelle, some of the yaw motors are stopped and held by yaw motor brakes, then after a delay, the other yaw motors are stopped and held by yaw motor brakes. When the other yaw motors are stopped, the drive gears 4m of the some yaw motors and the drive gears 4n of the other yaw motors hold the gear 2 by pressing against the gear 2 in opposite directions of rotation.
Claims4
A horizontal axis wind turbine, comprising:
- a main wind turbine unit;
- a tower holding the main wind turbine unit rotatably in a substantially horizontal direction;
- and
- a drive mechanism located between the main wind turbine unit and the tower, configured to rotate the main wind turbine unit relative to the tower in the horizontal direction,
- wherein the drive mechanism, comprises:
- a ring gear fixed to one of the tower and the main wind turbine unit;
- a plurality of pinion gears for engaging with the ring gear;
- a plurality of motors, each of the motors being fixed to a respective pinion gear, configured to rotate the main wind turbine unit relative to the tower by driving the pinion gears, said plurality of motors being fixed to the other of the tower and main wind turbine unit;
- and
- a controller connected to each of the motors, for controlling the motors,
- wherein the controller, when stopping a rotation of the main wind turbine unit, stops some of the motors, and then stops the rest of the motors after a specified amount of time.
Dependencies are inferred from the claim text.