The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2014
Filed:
Mar. 09, 2011
Applicant:
Tomoya Sakaguchi, Kuwana, JP;
Inventor:
Tomoya Sakaguchi, Kuwana, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01M 15/02 (2006.01); G01M 15/04 (2006.01); F03D 11/00 (2006.01); F03D 7/02 (2006.01); F03D 11/02 (2006.01);
U.S. Cl.
CPC ...
F03D 11/02 (2013.01); F05B 2260/83 (2013.01); F03D 11/0091 (2013.01); F05B 2270/702 (2013.01); Y02E 10/722 (2013.01); F05B 2260/4031 (2013.01); F05B 2270/326 (2013.01); F03D 7/0244 (2013.01); Y02E 10/723 (2013.01); F03D 7/0204 (2013.01); F05B 2260/74 (2013.01);
Abstract
When it is determined that a blade is rotating, a control device operates a braking device, and acquires a rotation angle (first rotation angle) from a rotation angle sensor. Then, the control device reverses a nacelle and acquires again a rotation angle (second rotation angle) from the rotation angle sensor. Then, the control device determines whether or not the difference between the first rotation angle and the second rotation angle is greater than a threshold value. When it is determined that the rotation angle difference is greater than the threshold value, the control device determines that a gear or a bearing of a gearbox is worn out.