CA2263966A1

CA2263966A1 - Improvements to eolian energy production systems

Info

Publication number: CA2263966A1
Application number: CA002263966A
Authority: CA
Inventors: Miguel Angel Robles Akesolo
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-22
Filing date: 1997-08-21
Publication date: 1998-02-26
Also published as: AU3851597A; EP0921310A1; WO1998007983A1; JP2000516682A; EP0921310B1; DE69708885T2; ATE210245T1; US6081043A; AU732252B2; DE69708885D1

Abstract

The improvements are applicable to the type of energy production eolian systems known as translation wind motors, based on the arrangement of a series of blades (1) having an optional profile and mounted on drive cables (2) forming a closed flexible line; the blades are joined through separators (6) to the corresponding drive cables (2), and the attack angle of each blade varying through the relative displacement of said cables (2) with respect to governing cables (8). In one embodiment, the blades are joined to an orientation axis (25) on which they can freely rotate in order to adopt spontaneously the adequate attack angle, the maximum power control being achieved by displacement of the blades (1) with respect to the cables (2) overcoming the resistance exerted by a calibrated spring or elastic element. The flexible line moves on pulleys (4) comprised of rings (18) which preferably are arranged coaxially to the columns (3) sustaining the structure.

Description

?101520253035CA 02263966 l999-02- 191AN EOLIAN SYSTEMS FOR ENERGY PRODUCTIOND E S C R I P T I O NOBJECT OF THE INVENTIONThe present invention refers to a system for producingeolian more specifically in eolianinstallations of the type known as shifting wind motors,consisting of a series of blades with a suitable profileenergy energy,fixed to a closed and flexible belt, consisting of cableswhich move horizontally between at least two columns, suchthat the impact of the wind on the blades involves thembeing pushed and consequently the dragging of the flexiblebelt, said movements being applied to the production ofelectric energy.The object of the invention is to obtain an eoliansystem in which each one of the blades may vary itsorientation with respect to the transmission belt,consequently, with respect to the wind, allowing the systemto operate at a fixed speed, independent from wind speed.andAnother object of the invention is to allow the systemto start by itself easily and that the blades may be flaggedto support considerably strong winds.And yet another object of the invention, according toa variation of the embodiment, is to obtain an eolian systemin which the blades spontaneously adopt, according to windstrength and direction, the ideal angle of attack, thesystem operating together with angle of attack limitingso that when the wind exceeds the values pre-thedevices,established as maximums in the installation design,angle of attack of the blades is selfâadjusted, presentingless resistance to the wind and hence safety. in the?101520253035CA 02263966 l999-02- 19installation.The result sought by the system in the invention is toincrease the performance of the shifting wind motor, extendmaterial life, increase machine reliability, reduce' installation costs and widen the operation speed range.BACKGROUND OF THE INVENTIONDifferent types of eolian systems are known which arebased on the strength of the wind applied to bladesvertically mounted over a flexible and closed transmissionbelt running between columns, by means of theircorresponding pulleys, such that the strength of the windimpinging on the blades involves them being pushed and, asa result, the dragging of the transmission belt, to be ableto apply the kinetic energy created by the movement to thepumping of water or air, the driving of mills or othermachines or to supply alternators to produce electricenergy.A system of this type is that claimed in the Spanishpatent No. 9401773, of the same applicant, which is basedon a series of blades having a bi-convex profile, which aretransversely joined, across some distancing components, toa flexible transmission belt, specifically consisting of twoor more cables in a horizontal arrangement and at differentheights, cables which run over pulleys, in turn arranged ina series of columns or towers, pulleys which are assembledon alternator shafts, such that movement in the closedcircuit of the transmission belt formed by the cables isconverted into a rotational movement by the pulleys andhence in a movement of the alternator shaft to produceelectric energy.These types of systems are of a fixed pitch, that is,9-'3 _~ kâuuâ\âJ?101520253035CA 02263966 l999-02- 193the relative position between the cables of the transmissionbelt and the blade profile axis remains constant such thatthe wind impact angle at the blade depends on the ratio ofblade and wind speeds, it being necessary to use mechanismswhich vary the speed of the blades to select an impact angleon theother hand, the wind impact angle over the blade profileand hence be able to adjust the wind motor power.when the turbine is idle is inadequate for motor effects tobe produced on them and, therefore, the system cannot startby itself. Finally, when extremely strong winds or galesblow, the blades are subjected to very large stresses, itbeing possible, on certain occasions, that they sufferconsiderable damage or complete destruction.thatwhich discloses theAnother characteristics isdescribed in Patent GBâA-403 607,possibility of changing the position of the blades with thesystem with sameassistance of a regulator associated to one of the twoshafts and to an auxiliary chain which brings about a changein the leading angle of all the blades with the assistanceof short rods.Although this entails in itself aremarkable advancement in optimising performance,systemit ishowever more complex and furthermore provides a mayordrawback or disadvantage in that the change in the leadingangle of the blades is the same for all of them.DESCRIPTION OF THE INVENTIONThe improvements, purpose of this invention, applicableto the type of eolian system for energy production referredto in the previous section, are based on varying the bladepitch, i.e., to modify in a controlled manner the anglewhich the blade presents to the wind, hence allowing a speedof fixed design in the cables to be chosen. For this?101520253035CA 02263966 l999-02- 194purpose, mechanisms have been foreseen which permitvariation of the angle between the blade and the cablescomprising the transmission belt.The variation in blade pitch or angle, is obtained bylongitudinally or transversely displacing one or several ofthe transmission belt cables, hereinafter called rulingcables, with respect to the remaining cables or drag lines,joining the ruling cables to the blade, delayed with respectto the drag lines, according to the direction of movement,such that the displacement of the ruling cables with respectto the drag lines provokes the rotation of the blade overthe unions of the former to the drag lines.If the blade pitch is varied by means of longitudinaldisplacement of the ruling cable, the drag lines are joinedto the front part or attack edge of the blade by respectiveseparating arms, articulated in the union to the blade orto the cable, while the ruling cables are joined to theblade exit edge by means of a mechanism consisting of aseparating arm, fixed to the cable and a distancing rod,articulated between the arm and the blade, proceeding to thebraking of the ruling cables provoking a relativelongitudinal displacement with respect to the drag linesand, as a result, pull the blade tail. This movementproduces rotation of the blade with respect to its pointsof union to the drag lines and, hence, a change of bladeorientation with respect to the transmission belt and thewind.The distancing rod may be a hydraulic or pneumaticspring whose spindle is articulated to the blade tail andwhose cylinder is joined to the separator arm fixed to theruling cable, to dampen the tugging produced by the systemfundamentally when the blades change direction over thepulleys. - ~r"fl}? \â_\â_/P Q_ .â-wffwâ?101520253035' accordingly.CA 02263966 l999-02- 195The braking of the ruling cable may be produced bymeans of any system known, for example, by incorporating onthe exit axis of the pulley associated to this cable, agenerating component which absorbs, in a controlled manner,more or less energy and therefore braking the cable movementEvidently, any other type of braking systemknown may be used.The relative transverse displacement between the rulingcables and the drag lines is produced on a horizontal planeand in the direction of the prevailing winds, for whichpurpose all the cables of the flexible transmission belt arejoined to the blades by means of articulated separator armsand a horizontal displacement of the pulleys over which theruling cables run is provoked. Obviously, this displacementcauses the separator arm associated to the ruling cable tobe pushed with respect to the drag separator arm and as aDepending on the greater or lesserand the direction of theresult, blade rotation.displacement of the pulleysdisplacement, the angle formed by the blade may be variedat will.Likewise, blade ruling may be performed by means ofcombining braking of the ruling cables and displacement ofthe ruling cable pulleys on their own horizontal plane.In this way, by controlling the displacement of theruling cables, it is possible to vary in a controlledmanner, the angle formed by the blade and the transmissionbelt and,blades, it being possible to chose the push of the latterover the cable. Also, a safety position of the system maybe adopted when the wind speed is extremely high, such thatthe blades respect to the wind.Likewise, it is possible to orientate the blades such thatas a result, the wind impact angle over theremain flagged withthe wind impact angle over the profile is adequate to?101520253035' controlCA 02263966 l999-02- 196produce motor effects with the turbine stopped and thesystem may start by itself.That attack of the blades, asindicated above,is, the angle ofis sought in each moment by a ruling orcenter of the installation, according to thecharacteristics of the existing wind, being simultaneouslymodified for all the blades, such that all of them areobliged to adopt the angle of attack determined by thewithout taking into account that the windevidently theruling center,received by each blade is different, since,overlapping and superposition of the eolian influence zonefor each blade acts over the rest, such that the bladesworking upstream do not perceive the wind in the same wayas the blades working downstream, and neither do twoconsecutive blades perceive the same type of wind.theNow then, in one variation of the embodiment,shifting wind motor is made to work with a constant angleof attack, without centralized automatic control systems,such that each blade independently and spontaneously adopts,for any wind speed and direction, without any externalcontrol thereof, the angle of attack producing the greatestpush in the longitudinal direction of the cables and, hence,the maximumto extract from the wind, at any given time,This permits greater reliability, costpower possible.reduction, improvement of aerodynamic performance andspontaneous starting of the system.That is, with winds below the nominal power, the angleof attack for the blades is that of maximumperformance and this angle of attack is acquired by theblades individually and spontaneously due to the way inwhich the blade is fastened to the cable.alwaysIn the case of winds above the nominal power, each?101520253035CA 02263966 l999-02- 197blade, pushed by the wind, advances byexceeding the force of a pre-stressed spring,which terminates in a sliding stop which generates a turningmoment in the blade proportional to the wind. This momentindividually,a movemententers in the sum of the moments which maintained theprevious angle of attack, the equilibrium of opposed momentsbeing in another angle of attack, an angle which decreaseswith increasing wind speeds. The result is that the forcecouple in the cables is maintained at a fixed value.for winds below those of nominal power,control of bladeindividually and spontaneously and this performance isIn this way,performance is executed by eachdetermined by blade construction. when the wind exceeds thenominal speed, power control is possible by adjusting bladespeed, because, in these winds, the blades give a constantcouple, as already explained above and according to theequation "power = force x velocity" and as the force couplein the cable is the sum of pushing of the blades, which isconstant, and the speed is limited by the generator or load,the power is also limited.The spontaneous angle of attack according to theinvention is obtained. by enabling the blade to rotatefreely, like a vane, over a point or axis that runs parallelto the span, specifically chosen so that the blade adoptsan orientation deviated several degrees with respect to therelative wind it perceives. At the height of each cable theblade has a fastener which fixes it to the cable across itsorientation and turning axis. Depending on average windspeed and the power or size of the shifting wind motor, theblade profileâis defined, which may be symmetrical or ofsymmetrical action, convex or convexo-concave, asymmetricalor deformable symmetrical of canvas and other materials.Once the profile has been selected, the rope and the planare defined to then search for the angle of attack giving?101520253035CA 02263966 l999-02- 198us the maximum force over the cable and the fastening pointwhose moment is zero for this angle of attack, such that wehave the blade with its orientation axis.All wind motors, but especially those of a large size,need some type of maximum power control, since if this werenot the case even the smaller ones, to be able to capturethe fastest winds without failures, would have to beunacceptably oversized for their economic performance. Eachtime the wind doubles its speed, the power increases eight-fold and nevertheless, there are many hours per year of slowand moderate winds and very few hours of strong winds.Therefore, it is imperative to search for the balancebetween structure, investment and energy captured, since,definitively, the greatest amount of energy should becaptured with a minimum investment.According to the invention, the limitation of maximumpower is given by a mechanism which joins the bladeorientation axis and the cable. This mechanism allows theblade to move with respect to the cable in the longitudinaldirection of the latter when the wind exceeds the maximumdirection of the latter when the wind exceeds the maximumdesign power. The forward movement of the blade is limitedby the force of a spring or preâstressed spring, with aforce which is the maximum given by the blade, such thatwhen the blade pushes the cable with a force greater thanthe prestressed force of the spring, the latter retirescompressing and permitting the blade to move forwards. Theforward movement of the blade makes a leverâ which isinterlocked with the orientation axis and, hence, the blade,to contact with an inclined partition interlocked with thecable, obliging the blade to adopt an angle of attack whichdecreases as the advance increases or, in other words, thegreater the force received from the wind, thus achieving abalance between spring compression and the blade angle of\ Vttx\Aâ<ââYâr& Qf(?101520253035CA 02263966 l999-02- 199attack, which stabilizes the force produced by the blade onthe flexible belt.The other improvement contributed by the inventionconcerns the pulleys which, according to the invention,consist of a hoop which rotates around one or several wheelswhich confine it. The axes of these wheels are fixed to thecolumns supporting the assembly across corresponding radialarms. The axes of the wheels supporting and guiding the hoopmay be shafts of electric generators (alternators) or ofmechanical transmission. In turn, externally, the hoop hasa throat or channel suitable to guide the correspondingcable and inside a rolling track suitable for the guidanceand transmission of mechanical energy to the guide wheelswith minimum friction losses and noise. The structure of thehoop and wheels should be sized to support, with minimumdeformation and without fatigue, the cable tension, thecentrifugal force and its own weight.DESCRIPTION OF THE DRAWINGSTo complement the description being made and tocontribute to a greater understanding of the characteristicsof the invention, this descriptive report is accompanied bya set of drawings, as an integral part thereof, which areto illustrate and not to limit the invention, where thefollowing figures are shown:Figure 1 - This shows a schematic view according to aside elevation of the system of the invention, according toa transmission belt formed by three cables, showing the twodrag lines and the ruling cable joined to the bladesaccording to a first embodiment in which the ruling cablemay be displaced longitudinally with respect to the draglines.?101520253035CA 02263966 l999-02- 1910Figure 2 - This shows a schematic plan view of the samesystem shown in the previous figure.Figure 3 ~ This shows, schematically, the mechanismbased on which the longitudinal displacement of the rulingcable is converted to a variation of the angle of attack ofthe blades with respect to the direction of the wind, whenthe separator arms are joined in a fixed manner to the bladeand articulated to the cable.Figure 4 - This shows, schematically, the mechanismbased on which the longitudinal displacement of the rulingcable is converted into a variation of the angle of attackof the blades with respect to wind direction, in the casein which the separator arms are articulated to the blade andfixed to the cable.Figure 5 â This shows a schematic View according to aside elevation of the system of the invention, according toa transmission belt consisting of three cables, showing ablade and the means of union of the latter with the two draglines and the ruling cable, as well as the positions thepulley may occupy, which supports the ruling cable accordingto an embodiment in which said ruling cable may be displacedby the movement of the pulleys in a horizontal plane and thedirection of the prevailing winds.Figure 6 - This shows a plan View of the system of theinvention, according to a transmission belt consisting ofthree cables, according to an embodiment in which the rulingcable may be displaced by movement of the pulleys in ahorizontal plane and in the direction of the prevailingwinds.Figure 7 â This shows a schematic view according to arepresentation in side view of-one part of the system?l01520253035CA 02263966 l999-02- 19llrealized according to a different embodiment, where onecolumn of the various possibilities appears that may beincluded in the eolian system, on whose column are fittedtwo hoops guided on the corresponding pulleys and over saidhoops the corresponding drag lines carrying the blades withthe support and orientation system realized according tothis second form of embodiment.Figure 8 - This shows a schematic plan view of the partof the system or installation represented in the previousfigure.Figure 9 - This shows a detail of what could beconsidered a perspective of a blade with the correspondingorientation and support axis to the cables.Figure 10 - This shows a detailed view correspondingto the blade union support, across its orientation axis, tothe cable, which support integrates the mechanism allowingself-orientation of the blade, in order to adopt an angleof attack smaller than the spontaneous angle when the windlimit established for thespeed exceeds the safetyinstallation.Figure 11 - This shows a section view of the blade, toillustrate on the same, different positions of the supportaxis, each one of which will result in a spontaneous angleof attack, all according to the embodiment shown in figures7 to 10.Figure 12 - This shows the graph in which the relationexisting between the angle of attack, the orientation axisdistance from the attack edge of the blade and the drivingforce provided by the blade are shown.Figure 13 - This shows, finally, a detail of the hoopAwiiiw3&5?â?101520253035CA 02263966 l999-02- 1912guide through which the drag line runs, which hoop is guidedin one or more internal wheels whose axis, in this case,corresponds to that of an alternator.PREFERRED EMBODIMENT OF THE INVENTIONIn view of the commented figures and according to anembodiment in which the transmission belt consists of threecables, it may be observed how the eolian system of theengine comprises a plurality of blades (1) arrangedvertically and fastened through their internal face to apair of drag lines (2), which run along a <:losed linebetween two columns or towers (3) arranged opposite to eachother, with the particularity that these drag lines (2)determining the transmission belt pass across thecorresponding pulleys (4) fitted on arms (5) which act asseparators.In the details of figure 1 and extended in figure 3,the bi-convex profile of the blades (1) is shown, such thattheir fastening to the cables (2) is made at their internalface, near to the attack edge or the end of greatestthickness, making the link of each cable (2) to the blade(1) by means of the corresponding separator arms (6), eitherjoining in a fixed manner to the cables (2) and articulatedto the blades (1), or in an articulated manner to the cables(2) and fixed to the blades (1). when wind speeds are low,blades of a deformable profile may be used and even thoseof a curved profile.Complementarily, according to a first embodiment, thesystem incorpbrates an intermediate cable (8), called aruling cable, to which the blades (1) are joined by theirtail or exit edge by means of a mechanism constituted asfrom a separator arm (9) whose free end counts with a joint(10) on which a tubular component (11) is arrangedAMENDE9 SHEET?101520253035CA 02263966 l999-02- 1913internally to which a rod (12) may be displaced which, atits other end and across the joint (13), is linked to theexit edge or tail of the blade itself (1). According to thisembodiment, when the ruling cable (8) is slowed down withrespect to the drag lines (2), the tail of the blade (1) ispushed by the rod (12) which causes said blade (1) to rotateand as a consequence a variation in the angle formed betweenthe latter and the transmission belt is produced.The ruling cable (8), intermediate between the lines(2) of the flexible transmission belt, also runs between thecorresponding pulley (4') fitted over the columns (3), withthe corresponding distances (5').Finally, it should be said that the rod (12), havingboth an axial and an angular movement, has an elasticcomponent (14) associated to a final run stop (15), whichdampens the longitudinal displacements of the rod (12),eliminating the sudden tugs produced on changing thedirection of the blades (1). This effect may be obtainedmore easily when the rod (12) is constituted by the spindleof a spring, hydraulic or pneumatic, joining the mentionedspindle in an articulated way to the tail of the blade (1),while the cylinder of the dampener is joined, also in anarticulated manner to the separator arm (9) fixed to theruling cable (8).According to another embodiment, the relativedisplacement between the ruling cable (8) and the draglines (2) is achieved by displacing the pulley (4') overwhich the ruling cable (8) runs in a horizontal plane andaccording to the direction of the prevailing winds. In thisembodiment, the ruling cable (8) is joined to the blades(1), by their tail or exit edge, by means of separators (6)similar to those used for the union of the drag lines (2)to the blade (1) attack heads or edge, such that thep.\1\99â9(cQ9595:?101520253035CA 02263966 l999-02- 1914horizontal displacement of the pulleys (4') through whichthe ruling cable (8) runs provokes a pushing of theseparator arm (6), associated to the ruling cable (8), overthe blade (1) and, as a result, a rotation of the latterwith respect to the separator arms (6) associated to thedrag lines (2). Depending on the greater or lesserdisplacement of the pulleys (4') and the direction in whichthe displacement is made, the angle formed by the blade (1)may be varied at will.By means of the system, constituted as above, and onthe basis of a relative displacement of the ruling cable (8)with respect to the drag lines (2), the blades (1) may besuitably orientated to obtain the maximum performance whenthe wind is advantageous, it also being able to adopt asafety position when the wind strength is extremely high andmay damage the system if it directly impinged on the blade(1) surface.In a variation of the embodiment, that shown in figures7 to 13, it "may be observed how the eolian system orshifting wind motor includes several blades (1) fixed overthe drag lines (2), which constitute the flexible belt, thewind direction being observed in figure 8 according to thearrow (16) and the direction of line (2) movement accordingto the arrow (17).The lines (2) run through hoops (18), which arepreferably fitted coaxially to the corresponding supportcolumns (3), such that said hoops (18) are guided on wheels(19) arranged internally and foreseen at the ends of thecorresponding'radial arms (20) protruding from the supportcolumn (3). As may be observed in figure 7, alternators (21)have been foreseen on the wheel axes (19).â In a preferred embodiment, the hoops (18) will have a?101520253035CA 02263966 l999-02- 1915rim (22), finished in a rolling extension (23) whichcontacts with the wheel (19). Obviously, the hoop or hoops(18) will have a throat for cable guidance (2).As indicated above, depending on the average speed ofthe prevailing winds and the power and size of the windmotor, the blade profile is defined, and they may besymmetrical or of symmetric action, convex or convexo-concave or others. Once the blade profile has beenselected, the rope and plan thereof are defined, to thendetermine on a testing bench the angle of attack which givesus the maximum force over the cable and the fixing pointwhose moment is zero for said angle of attack, hencedefining the blade and its orientation axis.The union of each blade (1) to the lines (2) comprisingthe flexible belt, is made across their orientation axis(25) and for this reason, as illustrated in figures 2 and3, the blade will have notches (25â), cuts and other meanspermitting access to the axis from the union devices to thelines (2). Each blade (1) may freely rotate over itsorientation axis (25).According to the blade design selected, its orientationaxis may be external or internal, that is, it may be in theinside or outside.Likewise, the orientation axis (25) may be continuousor discontinuous, being physically or imaginatively extendedalong and parallel to the blade span.indicated, theorientation axis (25), continuous or discontinuous, isforeseen so that the blade may rotate freely with respectto the latter and, in turn, to join the blade to the draglines by means of the support parts 426), which, first ofAs has âbeen previously repeated?101520253035CA 02263966 l999-02- 1916all have some clamps (27) across which the assembly remainsfastened to the cable. Besides the clamps (27), at leastone of the support parts (26) is equipped with the maximumpower control mechanism, consisting of a sliding part (28)to which the orientation axis is fitted (25). Said slidingpart (28) may be displaced in a guide (29) statically fixedto the support (26) to which, as has been previouslymentioned, across respective clamps (27) the correspondingdrag line (2) is joined. The displacement of the slidingpart (28) is exerted against the force of a spring (30),which is tared according to the maximum safety force theblade should supply to the cable.As a result of the above, when the wind strength andhence the force supplied by the blade exceeds the springtare (30), the sliding part (28) moves forward dragging theblade (1) with the support axis (25), until the lever (31),interlocked with the axis (25), comes into contact with thepartition wall (32), made in the direction of the lever,such that the displacement of the latter over the partitionwall (32) causes the blade (1) to drift or, in other words,the proportional decrease of the angle of attack, that is,adopting an angle of attack, which will be less as the forceapplied by the blade against the spring (30) increases,there being a balance between spring compression and angleof attack of the blade, hence maintaining the force thelatter provides the cable stable.The maximum power control device described, shouldexist at least in one of the support parts (26) of the unionto the cables, depending on the existence of one or moreparts with this device, the length or span of the blades.The remaining union devices of the blade to the respectivecable across their orientation axis are not necessary tounderstand the maximum power control device, it beingpossible for~them to be simple means of union of the cablesz?iâ?10152025CA 02263966 l999-02- 1917to the orientation axis.Obviously, in the design of the wind motor thespontaneous angle of attack referred to by (Â«) will beadjusted, as shown in figure 10 and more specifically infigure 11, such that when taking into account that thisspontaneous angle of attack is the angle formed by therelative wind direction, corresponding to the arrow (33) andthe axis of the blade (1) itself, the relative wind beingthe result between the real wind component (16) and thedriving power referred by (34) in figure 11. It may beverified how this spontaneous angle of attack (a) variesaccording to the position of the axis (25) with respect tothe attack edge (35) of the blade (1). In figure 11 thevariations of the mentioned angle (a) are seen or that ofspontaneous attack, as well as the variation of the distancebetween the assembly axis (25) and the attack edge (35) ofthe blade (1).In figure 12, a diagram is shown where theinterrelation existing between the axis position (25),namely, its situation with respect to the attack edge (35)of the blade, the spontaneous angle of attack (a) and thedriving power supplied in each case, may be observed. Thisdiagram corresponds to a NACA 63-O15 profile, with a ropeof 250 mm and for a relative speed of 22.2 m/s.

Claims

C L A I M S

1.- An eolian systems for energy production of the type consisting of several blades (1) mounted in a vertical position to a flexible, closed transmission belt consisting of a support structure based on towers or columns (3) defining the geometry of the transmission belt, whose towers or columns (3) support pulleys (4 or 19) over which run cables to which the blades (1) are fixed, being characterized in that they include a mechanism permitting the controlled variation of the angle between the blades (1) and the transmission belt to obtain the maximum performance when the wind is advantageous, such that each blade (1) is joined by its head or attack edge to the so-called drag lines (2), across separators (6) consisting of rods articulated to the blade (1) or the line (2), such that, at its tail or exit edge, the blades (1) are joined to ruling cables (8), such that the latter may be displaced longitudinally by the pulleys (4') braking supporting them, or transversely by displacement of the mentioned pulleys (4') in a horizontal plane and, as a result, vary the blade (1) angle with respect to the wind.

2.- An eolian systems for energy production, according to claim 1, characterized in that the longitudinal displacement relative to the ruling cables (8) is transmitted to the blades (1) with the collaboration of rods (12) joined at one end, in an articulated manner, to the tail or exit edge of the blades (1), such that the other end moves in a tubular component (11) also articulated to the separators (9), there being provided, elastic absorption devices (14) of tugging of the rods (12).

3.- An eolian systems for energy production, according to previous claims, characterized in that the rod (12) may be the spindle of a hydraulic or pneumatic spring whose cylinder will be articulated to the separator (9).

4.- An eolian systems for energy production, according to claim 1, characterized in that, in an alternative embodiment solution, the pulleys (4') supporting the ruling cables (8) are equipped with means for their horizontal displacement and in the direction of the prevailing winds, such that the ruling cables (8) are joined to the blades (1), by their tail or exit edge, across separators (6) similar to those of union of the blades (1) to the drag lines (2), such that displacement of the pulleys (4') over which the ruling cables (8) run, provokes a pushing of the ruling cables (8) on the separator arm (6) and the former over the tail or exit edge of the blades (1), creating a variation in the angular position thereof, with respect to the transmission belt, and consequently, with respect to the wind.

5.- An eolian systems for energy production, according to previous claims, characterized in that the blade (1) ruling may be performed by combining braking of the ruling pulleys (4') and displacement thereof on the same plane.

6.- An eolian systems for energy production, characterized because the blades (1) are fastened across an orientation axis (25), internal or external, continuous or discontinuous, which runs parallel to the blade span and is located in the point in which the turning moment is zero for the angle of attack of maximum push, over whose axis (25) the blade (1) rotates freely to adopt the mentioned angle spontaneously, having foreseen that the blade (1) may be displaced with respect to the drag lines (2) overcoming the force of a spring or elastic component, as from whose moment, the angle of attack will be gradually reduced until reaching a balance between spring compression and the angle of attack which maintains stable the force the blade contributes to the cable.

7.- An eolian systems for energy production, according to claim 6, characterized in that the points of support of the blades (1) to the drag lines (2) of the installation are located in intermediate points of said blade (1), such that access thereof is made across the notches (25'), cuts or any other means.

8.- An eolian systems for energy production, according to claims 6 and 7, characterized in that, in a preferable embodiment, the freely rotating orientation axis (25) of the blades (1) is joined to a sliding part (28) which may be displaced over a guide (29), forming part of the support (26) by means of which the assembly is joined to the drag line thanks to some clamps (27), it being foreseen that the longitudinal displacement of the sliding part (28) and hence the axis (25) of the blade (1) is performed by overcoming the force of a compression spring (30), until the lever (31) interlocked with the axis (25) comes into contact with a partition wall (32), forming part of the support (26), interlocked with the line (2), at which moment sliding of the lever (31) over the partition wall (32) provokes the drifting of the blade (1) and hence the gradual decrease of the angle of attack.

9.- An eolian systems for energy production, according to claim 6, characterized in that the position of the blade (1) orientation axis (25) is established by design according to the profile and plan of the blade selected.

10.- An eolian systems for energy production, according to claim 6, characterized in that the support pulley and drag line guidance consists of hoops (18), which are preferably arranged coaxially to the support column (3), rotating each hoop (18) around one or several internal wheels (19), which keep them confined, the wheels (19) being joined to the support column (3) across radial arms (20) protruding from said column, it being possible that the wheel axles (18) are mechanical transmission axles or electric energy generators.

11.- An eolian systems for energy production, according to claims 6 to 10, characterized in that the hoops (18) have a throat for the passage of the line (2) and a rim (22), finished in a rolling extension (23) which makes contact with the wheel (19).