| 摘要 |
Provided is a pitch control device for a windmill, wherein feathering can be performed when an external power source is abnormal, when the electricity storage capability of a battery is reduced, and when a motor controller for controlling a motor of a pitch drive device breaks down. A motor controller (16) controls storage and discharge of electricity into and from a battery (12) and controls an induction motor (11) on the basis of a control signal for changing the pitch angle, the control signal being output by a pitch controller (13). A switching box (17) switchably connects an external power source supplied as an alternating-current power source and the battery (12) to the induction motor (11). A first abnormality detector (15) detects the abnormality of the external power source, and a second abnormality detector (19, 24-29) detects the abnormality of the battery (12) or the motor controller (16). Feathering is performed by connecting the induction motor (11) and the battery (12) when the first abnormality detector (15) detects the abnormality, and connecting the induction motor (11) and the external power source when the second abnormality detector (19, 24-29) detects the abnormality. |
