JP2786582B2 - Windmill - Google Patents
WindmillInfo
- Publication number
- JP2786582B2 JP2786582B2 JP5186077A JP18607793A JP2786582B2 JP 2786582 B2 JP2786582 B2 JP 2786582B2 JP 5186077 A JP5186077 A JP 5186077A JP 18607793 A JP18607793 A JP 18607793A JP 2786582 B2 JP2786582 B2 JP 2786582B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- variable pitch
- cylinder
- wind turbine
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Hydraulic Motors (AREA)
- Wind Motors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、風力発電などに適用さ
れる風車に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind turbine applied to wind power generation and the like.
【０００２】[0002]
【従来の技術】図２は風力発電などに使用されている従
来の風車の説明図である。図において、本風車は回転数
を一定に保つために油圧シリンダー２により可変ピッチ
翼１の角度θを変えるようになっており、通常の運転時
における可変ピッチ翼１の角度θは風向きに対してθ＝
６０°〜９０°の運転範囲θ 1 ＝３０°で制御される。
θ 2 は運転準備範囲で、θ 2 ≒６０°である。また、休
止時には可変ピッチ翼１の角度θをθ＝０とし、風向き
に対して平行にする。この状態は風力で回転することが
なく、フェザーリングと称される。2. Description of the Related Art FIG. 2 is an explanatory view of a conventional wind turbine used for wind power generation and the like. In the figure, the wind turbine is configured such that the angle θ of the variable pitch blade 1 is changed by a hydraulic cylinder 2 in order to keep the rotation speed constant. θ =
The operation is controlled in an operation range of 60 ° to 90 ° θ 1 = 30 °.
θ 2 is the operation preparation range, where θ 2 ≒ 60 °. At rest, the angle θ of the variable pitch blade 1 is set to θ = 0, and is made parallel to the wind direction. This state does not rotate with wind force and is called feathering.
【０００３】可変ピッチ翼１の角度θを油圧シリンダー
２により制御する油圧ユニットには、フェザーリング用
の油圧切換弁０９、蓄圧器６、サーボ弁３、油圧ポンプ
４、タンク５などが組込まれている。通常、風車翼はθ
1 ＝３０°の運転範囲で運転される。風力が強くなると
回転数が増すが、コントローラ１８がこの回転数の信号
を感知してサーボ弁３を油圧シリンダー２内の右室１１
に作動油を送油、左室１２から作動油を排油するように
切換えることによりロッド１３を図における左方に移動
する。すると、ロッド１３に連結されている可変ピッチ
翼１の角度θが小さくなって回転数が低下し、回転数が
一定に保たれる。符号１７は風車翼１の角度θを感知す
る変位センサーである。また、風力が弱くなって風車翼
１の回転数が低くなると、サーボ弁３がコントローラ１
８により上述の逆方向に切換わってロッド１３が図にお
ける右方に移動し、可変ピッチ翼１の角度θが大きくな
ることにより回転数が増す。運転中は油圧切換弁０９が
閉じられており、蓄圧器６に高圧油が蓄圧される。風車
の休止時や油圧ポンプ４の故障時などには油圧ポンプ４
の吐出圧力が低下するが、この低下により油圧切換弁０
９が開弁して蓄圧器６内の油圧が油圧シリンダー２内の
右室１１に送油され、ロッド１３が図における左方へ移
動することにより、風車翼１が風向きと平行になってフ
ェザーリング状態となる。The hydraulic unit for controlling the angle θ of the variable pitch blade 1 by the hydraulic cylinder 2 incorporates a hydraulic switching valve 09 for feathering, an accumulator 6, a servo valve 3, a hydraulic pump 4, a tank 5, and the like. I have. Usually, the wind turbine blade is θ
It is operated in an operation range of 1 = 30 ° . When the wind power increases, the rotation speed increases. However, the controller 18 detects the signal of the rotation speed and switches the servo valve 3 to the right chamber 11 in the hydraulic cylinder 2.
The rod 13 is moved to the left in the figure by switching the hydraulic oil to be supplied and the hydraulic oil to be discharged from the left chamber 12. Then, the variable pitch connected to the rod 13
The angle θ of the wing 1 becomes smaller, the rotation speed decreases, and the rotation speed is kept constant. Reference numeral 17 denotes a displacement sensor that senses the angle θ of the wind turbine blade 1. Further, when the wind speed becomes weak and the rotation speed of the wind turbine blade 1 becomes low, the servo valve 3
8, the rod 13 is switched to the above-described reverse direction, and the rod 13 moves to the right in the figure , and the angle θ of the variable pitch blade 1 increases, so that the rotation speed increases. During operation, the hydraulic pressure switching valve 09 is closed, and high-pressure oil is stored in the pressure accumulator 6. When the wind turbine is stopped or the hydraulic pump 4 fails, the hydraulic pump 4
Of the hydraulic switching valve 0
9 is opened, the oil pressure in the accumulator 6 is sent to the right chamber 11 in the hydraulic cylinder 2, and the rod 13 moves to the left in the drawing. Become parallel and enter the feathering state.
【０００４】[0004]
【発明が解決しようとする課題】上記のような従来の風
車において、このような風車は原則として無人運転であ
るとともに油圧シリンダー２などを含む油圧ユニットは
特に風車の高所にあるため、保守点検など油圧ユニット
に近付くことは長期間にわたって殆どない。このため、
油圧シリンダー２は低圧でも十分に作動するように大径
化されているとともに、シールや油圧ホースなどの耐久
性を増やしている。また、通常の運転時は可変ピッチ翼
１の制御範囲がθ1 ＝３０°と小さいために油圧シリン
ダー２のストロークも小さいが、フェザーリング時は可
変ピッチ翼１の角度θをθ2 ＝６０°以上に大きくスト
ロークし、これに伴って蓄圧器６も大容量のものを必要
としている。因みに、可変ピッチ翼１の角度θを０°〜
９０°動かす場合に必要な高圧油量Ｑ2 は次式で求めら
れる。In the above-described conventional wind turbine, such a wind turbine is operated in principle by unmanned operation, and the hydraulic unit including the hydraulic cylinder 2 and the like is particularly located at a high place of the wind turbine. It hardly gets close to a hydraulic unit for a long time. For this reason,
The hydraulic cylinder 2 is increased in diameter so as to operate sufficiently even at a low pressure, and has increased durability of a seal, a hydraulic hose, and the like. Also, during normal operation, the stroke of the hydraulic cylinder 2 is small because the control range of the variable pitch blade 1 is as small as θ 1 = 30 °, but it is possible during feathering.
The angle θ of the variable pitch blade 1 is largely stroked to θ 2 = 60 ° or more, and accordingly, the pressure accumulator 6 needs to have a large capacity. By the way, the angle θ of the variable pitch wing 1 is 0 °
High-pressure oil amount Q 2 required when moving 90 ° is given by the following equation.
【０００５】 Ｑ2 ＝（π／４）×Ｄ2 ×Ｌ………………………………………（１） 但し、Ｌは可変ピッチ翼１を９０°動かす場合に必要な
油圧シリンダー２のストロークである。Q 2 = (π / 4) × D 2 × L (1) where L is necessary when moving the variable pitch blade 1 by 90 °. This is the stroke of the hydraulic cylinder 2.
【０００６】[0006]
【課題を解決するための手段】本発明に係る風車は上記
課題の解決を目的にしており、回転数が過大になると蓄
圧器内の圧力をシリンダー内に供給し上記シリンダー内
のピストンにより押出されるロッドを介し可変ピッチ翼
の角度を変えてフェザーリング状態にする風車におい
て、回転数が過大になると作動して上記シリンダー内の
ピストン両側を連通するとともに上記蓄圧器内の圧力を
上記シリンダー内へ供給する切換弁を備えた構成を特徴
とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem. When the rotation speed becomes excessive, the pressure in the accumulator is supplied to the cylinder, and the pressure is pushed out by the piston in the cylinder. In a wind turbine that changes the angle of the variable pitch wing through a rod to enter a feathering state, when the rotation speed becomes excessive, it operates to communicate with both sides of the piston in the cylinder, and simultaneously pressurizes the pressure in the accumulator into the cylinder. It is characterized by a configuration provided with a switching valve for supplying.
【０００７】[0007]
【作用】即ち、本発明に係る風車においては、回転数が
過大になると蓄圧器内の圧力をシリンダー内に供給しシ
リンダー内のピストンにより押出されるロッドを介し可
変ピッチ翼の角度を変えてフェザーリング状態にする風
車における回転数が過大になると切換弁が作動してシリ
ンダー内のピストン両側を連通するとともに蓄圧器内の
圧力をシリンダー内へ供給するようになっており、風車
の回転数が過大になると切換弁が作動してシリンダー内
のピストン両側を連通するとともに蓄圧器内の圧力がシ
リンダー内に作用してピストンは両側の力の差、即ち圧
力の作用面積の差によりロッド側へ動いて可変ピッチ翼
の角度を変えフェザーリング状態となる。これにより、
可変ピッチ翼を動かすのに必要な作動流体量がピストン
の直径をＤ、ロッドの直径をｄとした場合に従来の風車
における作動流体量のｄ2 ／Ｄ2 と少なくなる。That is, in the wind turbine according to the present invention, when the rotation speed becomes excessive, the pressure in the accumulator is supplied to the cylinder, and the variable pitch blade is pushed through the rod pushed out by the piston in the cylinder. When the rotation speed of the wind turbine that changes the angle to the feathering state becomes excessive, the switching valve operates to communicate both sides of the piston in the cylinder and to supply the pressure in the accumulator to the cylinder. the piston pressure in the pressure accumulator acts on the cylinder with the rotation speed becomes excessive switching valve communicates the piston sides of the cylinder actuated difference on either side of the force, i.e. the difference between the active area of the pressure It moves to the rod side and changes the angle of the variable pitch wing to enter the feathering state. This allows
When the diameter of the piston is D and the diameter of the rod is d, the amount of working fluid required to move the variable pitch blades is as small as d 2 / D 2 of the working fluid in the conventional wind turbine.
【０００８】[0008]
【実施例】図１は本発明の一実施例に係る風車の説明図
である。図において、本実施例に係る風車は風力発電な
どに使用されるもので、回転数を一定に保つために油圧
シリンダー２により可変ピッチ翼１の角度θを変えるよ
うになっており、通常の運転時における可変ピッチ翼１
の角度θは風向き対してθ＝６０°〜９０°の運転範囲
θ 1 ＝３０°で制御される。θ 2 は運転準備範囲で、θ
2 ≒６０°である。また、休止時には可変ピッチ翼１の
角度θをθ＝０°とし、風向きに対して平行にする。こ
の状態は風力で回転することがなく、フェザーリングと
称される。FIG. 1 is an explanatory view of a wind turbine according to one embodiment of the present invention. In the figure, the wind turbine according to the present embodiment is used for wind power generation or the like, and the angle θ of the variable pitch blade 1 is changed by a hydraulic cylinder 2 in order to keep the rotation speed constant. Variable pitch wing 1
Is the operating range of θ = 60 ° to 90 ° with respect to the wind direction
It is controlled at θ 1 = 30 °. θ 2 is the operation preparation range, θ
2 ≒ 60 °. At rest, the angle θ of the variable pitch blade 1 is set to θ = 0 ° so as to be parallel to the wind direction. This state does not rotate with wind force and is called feathering.
【０００９】図における符号１は可変ピッチ翼で、風向
きに対して平行に近付くと風車は減速し、逆に風向きに
対して直角に近付くと増速する。２は油圧シリンダー
で、サーボ弁３の切換えにより作動油がピストン１５の
右室１１内に送油されて左室１２内の作動油が排油され
ることによりロッド１３が図における左方に動き、可変
ピッチ翼１がこれと連動して風向きと平行状態に近付い
て風車は減速する。これとは逆に、ピストン１５の左室
１２内に送油されて右室１１内の作動油が排油される
と、可変ピッチ翼１のロッド１３が図における右方に動
いて角度θが大きくなることにより風車は増速する。１
８はコントローラで、可変ピッチ翼１の回転数の信号及
び可変ピッチ翼１の角度検出変位計１７の信号が入力さ
れることによりサーボ弁３を制御する。４は油圧ポン
プ、５はタンクである。６は蓄圧器で、内部の圧力より
も油圧ポンプ４の吐出圧力が高いと高圧油を蓄圧し、逆
に低くなっても逆止弁７の作用により逆流しない。８，
１０はパイロット操作型の逆止弁で、油圧ポンプ４の吐
出圧力が高圧になると開弁して逆止弁として機能しない
が、低圧になると逆止弁として機能する。９はパイロッ
ト操作型の４方向切換弁で、油圧ポンプ４の吐出圧力が
高圧になってパイロット圧力が設定圧以上になると閉弁
する。逆に、油圧ポンプ４の吐出圧力が低下してパイロ
ット圧力が設定圧以下になるとばねに押されて開弁し、
右室１１と左室１２とを連通する。In the figure, reference numeral 1 denotes a variable pitch blade, which decelerates the wind turbine when approaching parallel to the wind direction, and increases the speed when approaching at right angles to the wind direction. Reference numeral 2 denotes a hydraulic cylinder, in which the hydraulic oil is fed into the right chamber 11 of the piston 15 by switching the servo valve 3 and the hydraulic oil in the left chamber 12 is drained, so that the rod 13 moves to the left in the drawing. Then, the variable pitch wing 1 moves in conjunction with this to approach a state parallel to the wind direction, and the wind turbine decelerates. Conversely, when the oil is fed into the left chamber 12 of the piston 15 and the hydraulic oil in the right chamber 11 is drained , the rod 13 of the variable pitch wing 1 moves rightward in the drawing to change the angle θ. As the size increases, the speed of the wind turbine increases. 1
A controller 8 controls the servo valve 3 by inputting a signal of the rotation speed of the variable pitch blade 1 and a signal of the angle detecting displacement meter 17 of the variable pitch blade 1. 4 is a hydraulic pump and 5 is a tank. Reference numeral 6 denotes a pressure accumulator, which accumulates high-pressure oil when the discharge pressure of the hydraulic pump 4 is higher than the internal pressure. 8,
Reference numeral 10 denotes a pilot operated check valve, which opens when the discharge pressure of the hydraulic pump 4 becomes high and does not function as a check valve, but functions as a check valve when the discharge pressure becomes low. Reference numeral 9 denotes a pilot-operated four-way switching valve, which closes when the discharge pressure of the hydraulic pump 4 becomes high and the pilot pressure becomes higher than a set pressure. Conversely, when the discharge pressure of the hydraulic pump 4 decreases and the pilot pressure falls below the set pressure, the valve is pushed by a spring and opens,
The right chamber 11 and the left chamber 12 are communicated.
【００１０】油圧ポンプ４が停止して吐出圧力が低下す
ると逆止弁８，１０が閉弁するとともに、切換弁９のパ
イロット圧力が設定圧以下になると切換弁９がばねに押
されて開弁し、油圧シリンダー２内の右室１１と左室１
２とが連通して圧力が均衡するのと同時に、蓄圧器６内
に蓄圧されている高圧油が逆止弁１４を開弁して右室１
１及び左室１２内に流入する。この状態でロッド１３は
油圧の作用面積の差、即ち次式で表わされる力Ｆ1 で図
における左方に動き、ピッチ可変翼１がこれに連動して
風向きに対して平行になりフェザーリング状態となる。When the hydraulic pump 4 stops and the discharge pressure drops, the check valves 8 and 10 close, and when the pilot pressure of the switching valve 9 falls below the set pressure, the switching valve 9 is pushed by a spring to open. The right chamber 11 and the left chamber 1 in the hydraulic cylinder 2
2 and the high-pressure oil stored in the pressure accumulator 6 opens the check valve 14 and the right chamber 1
1 and into the left chamber 12. The difference in oil pressure of the working area the rod 13 in this state, i.e. movement to the left in FIG. A force F 1 represented by the following formula, feathering state becomes parallel to the wind direction with variable pitch blades 1 in conjunction with this Becomes
【００１１】 Ｆ1 ＝（π／４）×ｄ2 ×Ｐ………………………………………（２） 但し、Ｐは作用圧力で、このときに必要な高圧油量は次
式で求められる。F 1 = (π / 4) × d 2 × P (2) where P is the working pressure and the amount of high-pressure oil required at this time. Is obtained by the following equation.
【００１２】 Ｑ1 ＝（π／４）×ｄ2 ×Ｌ………………………………………（３） 但し、Ｌは可変ピッチ翼１を９０°動かす場合に必要な
油圧シリンダー２のストロークである。一旦、フェザー
リング状態になると逆止弁１４の作用で元には戻らな
い。油圧ポンプ４が起動して吐出圧力が高くなると、パ
イロット圧力で切換弁９が閉弁し、逆止弁８，１０が開
弁するので、油圧シリンダー２の制御が再び可能とな
る。Q 1 = (π / 4) × d 2 × L (3) where L is necessary when moving the variable pitch blade 1 by 90 °. This is the stroke of the hydraulic cylinder 2. Once in the feathering state, it does not return to its original state due to the action of the check valve 14. When the hydraulic pump 4 is started and the discharge pressure increases, the switching valve 9 closes and the check valves 8 and 10 open with the pilot pressure, so that the control of the hydraulic cylinder 2 can be performed again.
【００１３】従来、このような風車は原則として無人運
転であるとともに油圧シリンダーなどを含む油圧ユニッ
トは特に風車の高所にあるため、保守点検など油圧ユニ
ットに近付くことは長期間にわたって殆どない。このた
め、油圧シリンダーは低圧でも十分に作動するように大
径化されているとともに、シールや油圧ホースなどの耐
久性を増やしている。また、通常の運転時は可変ピッチ
翼の制御範囲がθ1 ＝３０°と小さいために油圧シリン
ダーのストロークも小さいが、 フェザーリング時は可
変ピッチ翼の角度θをθ2 ＝６０°以上に大きくストロ
ークし、これに伴って蓄圧器も大容量のものを必要とし
ているが、本風車においては蓄圧器６の容量を小さくす
る手段として油圧シリンダー２とこれを制御するサーボ
弁３との間に、パイロット圧力が低下すると閉弁する逆
止弁１０と、パイロット圧力が低下すると開弁して油圧
シリンダー２の左室１２と右室１１とを連通させると同
時に蓄圧器６とも連通させる切換弁９が備えられてお
り、可変ピッチ翼１の角度θを０°〜９０°動かす場合
に必要な作動油量、即ち蓄圧器６により蓄圧される高圧
油量が式（３）で表わされる高圧油量Ｑ1 となり、式
（１）で表わされる従来の高圧油量Ｑ2 との油量比は次
式で示される。Conventionally, such a windmill is operated in principle by unmanned operation, and a hydraulic unit including a hydraulic cylinder and the like is particularly located at a high place of the windmill. For this reason, the hydraulic cylinder is increased in diameter so as to operate sufficiently even at a low pressure, and the durability of a seal, a hydraulic hose, and the like is increased. In normal operation, the stroke of the hydraulic cylinder is small because the control range of the variable pitch blade is as small as θ 1 = 30 °, but it is possible during feathering.
Although the angle θ of the variable pitch blades makes a large stroke of θ 2 = 60 ° or more, the pressure accumulator also needs to have a large capacity. Accordingly, in this wind turbine, as a means for reducing the capacity of the pressure accumulator 6, Between the cylinder 2 and the servo valve 3 for controlling the same, a check valve 10 that closes when the pilot pressure drops, opens when the pilot pressure drops, and opens between the left chamber 12 and the right chamber 11 of the hydraulic cylinder 2. Is provided at the same time as the pressure-accumulator 6, and a switching valve 9 is provided. When the angle θ of the variable pitch blade 1 is moved from 0 ° to 90 °, the amount of hydraulic oil necessary, that is, the pressure-accumulator 6 high amount of oil is accumulated oil amount ratio of conventional high-pressure oil amount Q 2 to which formula the high pressure oil amount Q 1 becomes represented by (3), equation (1) is expressed by the following equation by.
【００１４】 Ｑ2 ／Ｑ1 ＝Ｄ2 ／ｄ2 ………………………………………………（４） 即ち、ｄ／Ｄ＝１／２の場合は蓄圧器６の容量は１／４
と小さくなり、また従来の風車における排油管１６も不
要となるなどコストの低減が図られる。Q 2 / Q 1 = D 2 / d 2 (4) That is, when d / D = 1/2, the accumulator 6 Capacity is 1/4
The cost can be reduced, for example, by eliminating the need for the oil drain pipe 16 in the conventional wind turbine.
【００１５】[0015]
【発明の効果】本発明に係る風車は前記のように構成さ
れており、可変ピッチ翼を動かすのに必要な作動流体量
が少なくなるので、蓄圧器の容量も小さくすることがで
きてコストが低減される。The wind turbine according to the present invention is constructed as described above, and the amount of working fluid required for moving the variable pitch blades is reduced, so that the capacity of the pressure accumulator can be reduced and the cost is reduced. Reduced.
【図１】図１は本発明の一実施例に係る風車の油圧回路
図である。FIG. 1 is a hydraulic circuit diagram of a wind turbine according to one embodiment of the present invention.
【図２】図２は従来の風車の油圧回路図である。FIG. 2 is a hydraulic circuit diagram of a conventional wind turbine.
１ 可変ピッチ翼 ２ 油圧シリンダー ３ サーボ弁 ４ 油圧ポンプ ５ タンク ６ 蓄圧器 ７ 逆止弁 ８ パイロット操作型の逆止弁 ９ パイロット操作型の切換弁 １０ パイロット操作型の逆止弁 １１ 油圧シリンダーの右室 １２ 油圧シリンダーの左室 １３ ロッド １４ 逆止弁 １５ ピストン １７ 角度検出変位計 １８ コントローラ DESCRIPTION OF SYMBOLS 1 Variable pitch blade 2 Hydraulic cylinder 3 Servo valve 4 Hydraulic pump 5 Tank 6 Accumulator 7 Check valve 8 Pilot operated check valve 9 Pilot operated switching valve 10 Pilot operated check valve 11 Right of hydraulic cylinder Chamber 12 Left chamber of hydraulic cylinder 13 Rod 14 Check valve 15 Piston 17 Angle detection displacement gauge 18 Controller
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 平３−64713（ＪＰ，Ｂ２) 特公 平１−47627（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) F03D 7/04 F03C 1/007 F03D 1/06──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-B Hei 3-64713 (JP, B2) JP-B Hei 1-47627 (JP, B2) (58) Fields surveyed (Int. Cl. 6 , DB name) F03D 7/04 F03C 1/007 F03D 1/06
Claims (1)
シリンダー内に供給し上記シリンダー内のピストンによ
り押出されるロッドを介し可変ピッチ翼の角度を変えて
フェザーリング状態にする風車において、回転数が過大
になると作動して上記シリンダー内のピストン両側を連
通するとともに上記蓄圧器内の圧力を上記シリンダー内
へ供給する切換弁を備えたことを特徴とする風車。1. A wind turbine in which the pressure in an accumulator is supplied to a cylinder when the rotation speed becomes excessive, and the angle of a variable pitch blade is changed through a rod pushed out by a piston in the cylinder to enter a feathering state. A wind turbine, comprising: a switching valve that operates when the number of rotations becomes excessive to communicate with both sides of a piston in the cylinder and supplies pressure in the accumulator to the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5186077A JP2786582B2 (en) | 1993-07-28 | 1993-07-28 | Windmill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5186077A JP2786582B2 (en) | 1993-07-28 | 1993-07-28 | Windmill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0742662A JPH0742662A (en) | 1995-02-10 |
| JP2786582B2 true JP2786582B2 (en) | 1998-08-13 |
Family
ID=16181985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5186077A Expired - Fee Related JP2786582B2 (en) | 1993-07-28 | 1993-07-28 | Windmill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2786582B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100126766A (en) * | 2008-07-04 | 2010-12-02 | 미츠비시 쥬고교 가부시키가이샤 | Wind-power generation device |
| KR101158618B1 (en) * | 2010-02-22 | 2012-06-22 | 미츠비시 쥬고교 가부시키가이샤 | Wind turbine generator and soundness diagnosis method thereof |
| JP5535970B2 (en) * | 2011-03-22 | 2014-07-02 | 三菱重工業株式会社 | Wind turbine generator and valve function confirmation method for wind turbine generator |
| KR101049217B1 (en) * | 2011-04-06 | 2011-07-13 | 부산대학교 산학협력단 | Lift power generation system |
| CN102506010B (en) * | 2011-12-15 | 2014-01-15 | 三一电气有限责任公司 | Wind driven generator and variable-pitch system thereof |
-
1993
- 1993-07-28 JP JP5186077A patent/JP2786582B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0742662A (en) | 1995-02-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100297834B1 (en) | Engine control system for construction machine | |
| US4007845A (en) | Swing mechanism | |
| US20100232964A1 (en) | Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine | |
| US6976358B2 (en) | Circuit for controlling discharge amount of hydraulic pump | |
| JP5496135B2 (en) | Hydraulic system of hydraulic work machine | |
| JP2634321B2 (en) | Cargo handling machinery | |
| CN101688384A (en) | The engine control system of building machinery | |
| JPH0627521B2 (en) | Control device for double-acting hydraulic cylinder unit | |
| US5064351A (en) | Variable displacement pumps | |
| JP2006336805A (en) | Control device of work machine | |
| JP2786582B2 (en) | Windmill | |
| KR20000064993A (en) | Hydraulic pilot circuit | |
| CN211231059U (en) | Digital hydraulic leveling system of working platform of overhead working truck | |
| JPH0579502A (en) | Hydraulic construction machine | |
| CN115289077B (en) | Integrated pump control driving system for concrete arm support and control method | |
| JP3563365B2 (en) | Actuator device for controlling the control surface of aircraft | |
| US9651062B2 (en) | Construction machine and controller | |
| JP2003206902A (en) | Method for controlling deadband of fluid system | |
| JP2608997B2 (en) | Drive control device for hydraulic construction machinery | |
| JPH0658111B2 (en) | Discharge amount control device for variable displacement hydraulic pump | |
| JP2002364516A (en) | Variable blade device of windmill | |
| CN115012467B (en) | Excavator rotary platform and working device action matching control system | |
| JPH04143473A (en) | Control device of oil-hydraulic pump | |
| JPH08226373A (en) | Variable-pitch blade type windmill | |
| JPH0742663A (en) | Windmill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980428 |
|
| LAPS | Cancellation because of no payment of annual fees |