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:
Feb. 11, 2014
Filed:
Jun. 03, 2011
Shigeo Yoshida, Tokyo, JP;
Shigeo Yoshida, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
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 gearthat is provided on the other of either the nacelle or the tower and that engages with the drive gearsof 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 gearsof the some yaw motors and the drive gearsof the other yaw motors hold the gearby pressing against the gearin opposite directions of rotation.