Patent ID: 11885304
Assignee: NABTESCO CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A wind turbine system comprising:
a ring gear;
a yaw drive unit including a pinion gear meshing with the ring gear, the yaw drive unit being configured to rotate the pinion gear;
a yaw brake unit configured to generate a braking force for inhibiting rotation of the ring gear;
a load information acquiring unit configured to acquire an external load applied to the ring gear;
a yaw control instructing unit configured to determine a wind direction deflection based on a wind direction sensed by a wind sensor, and to output a turn instruction to rotate the ring gear based on the determined wind direction deflection, and
a control unit configured to switch the ring gear from a stationary state to a rotating state based on the turn instruction,
wherein the control unit, in switching the ring gear from the stationary state to the rotating state, is configured to release the braking force of the yaw brake unit when a rotational torque generated on the ring gear by the yaw drive unit has been larger than the external load acquired by the load information acquiring unit, and to switch the ring gear to a rotating state with the rotational torque by the yaw drive unit larger than the external load.