Title:
PITCH CONTROL DEVICE FOR WINDMILL
Document Type and Number:
WIPO Patent Application WO/2010/116663
Kind Code:
A1
Abstract:
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 outputted 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.
Inventors:
KODAMA HARUO (JP)
Application Number:
PCT/JP2010/002246
Publication Date:
October 14, 2010
Filing Date:
March 29, 2010
Export Citation:
Assignee:
NABTESCO CORP (JP)
KODAMA HARUO (JP)
KODAMA HARUO (JP)
International Classes:
F03D7/04
Foreign References:
| JP2008075521A | 2008-04-03 | |||
| JP2003222070A | 2003-08-08 |
Other References:
See also references of EP 2418380A4
Attorney, Agent or Firm:
ONEDEE IP PARTNERS (JP)
Patent business corporation Wang Dee IP partners (JP)
Patent business corporation Wang Dee IP partners (JP)
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