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Title: Wind turbine

Abstract

A wind turbine of the type having an airfoil blade (15) mounted on a flexible beam (20) and a pitch governor (55) which selectively, torsionally twists the flexible beam in response to wind turbine speed thereby setting blade pitch, is provided with a limiter (85) which restricts unwanted pitch change at operating speeds due to torsional creep of the flexible beam. The limiter allows twisting of the beam by the governor under excessive wind velocity conditions to orient the blades in stall pitch positions, thereby preventing overspeed operation of the turbine. In the preferred embodiment, the pitch governor comprises a pendulum (65,70) which responds to changing rotor speed by pivotal movement, the limiter comprising a resilient member (90) which engages an end of the pendulum to restrict further movement thereof, and in turn restrict beam creep and unwanted blade pitch misadjustment.

Inventors:
 [1]
  1. (Glastonbury, CT)
Publication Date:
Research Org.:
ROCKWELL INTERNATIONAL CORP
OSTI Identifier:
864354
Patent Number(s):
US 4352629
Assignee:
United Technologies Corporation (Hartford, CT) OSTI
DOE Contract Number:  
AC04-76DP03533
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
wind; turbine; type; airfoil; blade; 15; mounted; flexible; beam; 20; pitch; governor; 55; selectively; torsionally; twists; response; speed; setting; provided; limiter; 85; restricts; unwanted; change; operating; speeds; due; torsional; creep; allows; twisting; excessive; velocity; conditions; orient; blades; stall; positions; preventing; overspeed; operation; preferred; embodiment; comprises; pendulum; 65; 70; responds; changing; rotor; pivotal; movement; comprising; resilient; 90; engages; restrict; misadjustment; wind turbine; preferred embodiment; turbine speed; wind velocity; preventing overspeed; operating speed; rotor speed; flexible beam; pivotal movement; limiter comprising; /416/

Citation Formats

Cheney, Jr., Marvin C. Wind turbine. United States: N. p., 1982. Web.
Cheney, Jr., Marvin C. Wind turbine. United States.
Cheney, Jr., Marvin C. Fri . "Wind turbine". United States. https://www.osti.gov/servlets/purl/864354.
@article{osti_864354,
title = {Wind turbine},
author = {Cheney, Jr., Marvin C.},
abstractNote = {A wind turbine of the type having an airfoil blade (15) mounted on a flexible beam (20) and a pitch governor (55) which selectively, torsionally twists the flexible beam in response to wind turbine speed thereby setting blade pitch, is provided with a limiter (85) which restricts unwanted pitch change at operating speeds due to torsional creep of the flexible beam. The limiter allows twisting of the beam by the governor under excessive wind velocity conditions to orient the blades in stall pitch positions, thereby preventing overspeed operation of the turbine. In the preferred embodiment, the pitch governor comprises a pendulum (65,70) which responds to changing rotor speed by pivotal movement, the limiter comprising a resilient member (90) which engages an end of the pendulum to restrict further movement thereof, and in turn restrict beam creep and unwanted blade pitch misadjustment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}

Patent:

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