US2011020136A1PendingUtilityA1

Blade pitch-angle control apparatus and wind turbine generator

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Assignee: MITSUBISHI HEAVY IND LTDPriority: Jun 10, 2008Filed: Jun 10, 2008Published: Jan 27, 2011
Est. expiryJun 10, 2028(~1.9 yrs left)· nominal 20-yr term from priority
Inventors:Tomohiro Numajiri
Y02P70/50Y02E10/72F05B 2270/604F05B 2260/79F05B 2260/506F05B 2260/406F05B 2260/40311F05B 2240/40F03D 80/70F03D 9/25F03D 15/10F03D 15/00F03D 7/024F03D 7/0224F03D 1/06F03D 7/02
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Claims

Abstract

A blade pitch-angle control apparatus is provided which can reduce the number of machining processes required for manufacturing a hub and which improves the maintainability due to a reduction in weight of each of hydraulic cylinders. The blade pitch-angle control apparatus, which is used in a wind turbine generator having a plurality of blades and which individually operates the pitch angle of each of the blades, uses the two hydraulic cylinders to operate each of the blades.

Claims

exact text as granted — not AI-modified
1 . A blade pitch-angle control apparatus that is used in a wind turbine generator having a plurality of blades and that comprises cylinders for individually operating a pitch angle of each of the blades,
 wherein two cylinders are used to operate each of the blades.   
     
     
         2 . A blade pitch-angle control apparatus according to  claim 1 , wherein the cylinders are disposed in parallel or slightly inclined towards each other. 
     
     
         3 . A blade pitch-angle control apparatus according to  claim 1 , wherein the cylinders are disposed closer to a nacelle than the center position on a blade pivot axis. 
     
     
         4 . A wind turbine generator comprising: a plurality of blades; and a blade pitch-angle control apparatus according to  claim 1 , which individually operates a pitch angle of each of the blades. 
     
     
         5 . A blade pitch-angle control apparatus according to  claim 2 , wherein the cylinders are disposed closer to a nacelle than the center position on a blade pivot axis. 
     
     
         6 . A wind turbine generator comprising: a plurality of blades; and a blade pitch-angle control apparatus according to  claim 2 , which individually operates a pitch angle of each of the blades. 
     
     
         7 . A wind turbine generator comprising: a plurality of blades; and a blade pitch-angle control apparatus according to  claim 3 , which individually operates a pitch angle of each of the blades. 
     
     
         8 . A wind turbine generator comprising: a plurality of blades; and a blade pitch-angle control apparatus according to  claim 5 , which individually operates a pitch angle of each of the blades.

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