KR20100013116U - Wind power generator blade pitch control assembly - Google Patents

Abstract

An assembly 15 for pitch control of the blades 16A, 16B, 16C of the wind generator 10 is disclosed. The assembly 15 is coupled to a number of operating systems 60A, 60B, 60C acting on the blades 16A, 16B, 16C to position the blades 16A, 16B, 16C in a manner that makes maximum use of wind. And a hollow central hub 15A. The assembly 15 is characterized in that each operating system 60A, 60B, 60C has its own electric motor 45A, 45B, 45C for its respective blades 16A, 16B, 16C, and each electric motor 45A, 45B. And 45C) and their respective central planetary reduction gears 50A, 50B, 50C interposed between the respective blades 16A, 16B, 16C.

Description

Wind Power Generator Blade Pitch Control Assembly {WIND POWER GENERATOR BLADE PITCH CONTROL ASSEMBLY}

The present invention relates to a blade pitch control assembly of a wind generator.

As is known, wind generators,

Pylons,

Mounted on a pylon, the front is equipped with a conventional three-blade rotor that houses the main components of the wind generator, including overdrive, electric generators, inverters and controls and controls, and converts wind power into mechanical power. It includes a nacelle to be fitted.

The rotor is connected to the main shaft of the generator and, in addition to the three blades, has a blade pitch control assembly, which has a hollow central hub that acts as a structural member to which the blade is attached. Each blade is connected to the hollow central hub by a central bearing which adjusts the angle of incidence of the blade profile with respect to the wind direction and causes the blade to rotate about its axis in order to make the best use of wind power.

In fact, as is known, rotation about the axis of the blade is essential for achieving maximum efficiency for each wind speed in terms of the conversion of wind power to mechanical power.

The bearings currently used to support the blades, in addition to supporting the blades, are provided with two rings (one fixed and one rotated with the blade) between which the rotor (ball or roller) is sandwiched. It is a central bearing that also allows rotation of the blades.

The fixed ring is integral with the hollow central hub, the rotating ring is integral with the blade, and has a gear tooth that engages with a pinion fitted to a motor reducer powered by an electric motor and fixed to an attachment integral with the central hub. .

In this case, the motor speed reducer is arranged at a point along the periphery of the circular seat on which the center bearing is fixed, so that the pinion mate with the gear of the center bearing.

The operation of the motor reducer rotates the geared ring, thus the blade by an angle.

The rotation about the axis of the blade is controlled by a signal proportional to the characteristics of the wind, which is continuously recorded by the anemometer in the generator, which is processed by an electronic central control unit with dedicated software to drive the inverter. Inverter controls the electric motor to rotate the blade.

However, blade pitch control assemblies of conventional wind generators of this type have problems that are caused by the overalization of large diameter geared central bearings, and have proved incomplete matching with pinions. Moreover, it is difficult to determine the mating clearance (an important factor in ensuring correct blade adjustment and preventing vibration) by being dependent on the required parts, in particular the manufacturing tolerances of the central bearing and the pinion-bearing center distance. The pinion-bearing center distance is determined by the tolerance of the sheet formed in the hollow central hub, which is always important in view of the large size of the necessary parts.

Geared central bearings of this type of blade pitch control assembly are expensive manufacturing parts due to the necessary materials and the cost of forming, machining and heat treating gear teeth.

Another important point to note is that gear teeth are formed along the entire circumference of the center bearing, even if only 1/4 of the gear teeth are actually used. In other words, the central bearing has an actual angle of rotation of 90 °, but for structural reasons, the gear is formed over an angle of 360 °, ie the entire circumference, to avoid stress between the toothed portion and the other non-rigid part.

This kind of assembly also has the problem of lubricating the central bearing and pinion gear, which is generally done with grease because the geared connection is "open", ie it is not housed inside the casing.

It is therefore an object of the present invention to provide a blade pitch control assembly of a wind generator which is configured to obviate or at least partially obviate the aforementioned disadvantages, while at the same time being cheap and easy to manufacture.

According to the present invention there is provided a blade pitch control assembly of a wind generator as claimed in claim 1 or in any of the claims that directly or indirectly refer to claim 1.

Non-limiting embodiments of the present invention will be described as examples with reference to the accompanying drawings.

The main advantage of the blade pitch control assembly of the wind power generator according to the present invention is that the pitch control system of each blade has a reliable central planetary speed reduction gear, which is powered by its own electric motor, and thus the obvolution of the pivot ( And as a result eliminates the need for lubricating the pivot gears and any errors caused by poor registration of the pivot gears and pinions).

1 is a perspective view of a wind generator fitted with a blade pitch control assembly according to the present invention.
2 is a perspective view of main parts of the nacelle forming part of the wind power generator of FIG.
3 illustrates a hollow central hub forming section of the blade pitch control assembly.
4 is a cross-sectional view of a portion of a blade pitch control assembly in accordance with the present invention.

Reference numeral 10 in FIG. 1 designates a wind generator as a whole, characterized by the main blade pitch control assembly of the present invention as described below.

The wind generator 10 has a pylon 11 which is fixed in the ground GR and in which the nacelle 12 is fitted in the upper end 11A.

As shown in more detail in FIG. 2, the nacelle 12 is housed in an elliptical housing 13 with a substantially cylindrical bottom collar 14.

The upper end 11A of the pylon 11 is inserted into the bottom collar 14, and the bearing (not shown) between the bottom collar 14 and the upper end 11A of the pylon 11 is substantially symmetrical to the pylon 11. Allow rotation of nacelle 12 about a vertical vertical axis X that is a line (FIGS. 1 and 2).

Nacelle 12 accommodates mechanical components as described below.

In the right side of Fig. 2, the blade pitch control assembly 15 comprises three blades 16A, 16B, 16C at intervals of 120 °; FIG. 2 includes a substantially spherical hollow central hub 15A (see also FIG. 3) into which only blades 16A and 16C are shown.

The hollow central hub 15A is covered by the first portion 13A of the housing 13. As described in more detail below, the action of the wind on the blades 16A, 16B, 16C is such that the hollow central hub 15A and the first portion 13A of the housing 13 are substantially symmetrical lines of the housing 13. Rotate around the vertical axis (Y).

As shown in FIGS. 2 and 3, the shaft 20 is integral with the hollow central hub 15A and extends from the hollow central hub to drive the electric generator 21 at the rear of the housing 13.

Routinely, overdrive 21A is disposed immediately upstream from the electric generator 21.

Antenna 22 protrudes from housing 13 and anemometer 23 is collected to collect information about wind speed and wind direction for blade pitch control assembly 15 to control the pitch of blades 16A, 16B, and 16C. It is installed.

Wind data collected by the anemometer 23 is transmitted to the electronic central control unit CC in the nacelle 12 for the purpose described in detail below.

The shaft 20, the electric generator 21 and the electronic central control unit CC are accommodated in the second part 13B of the housing 13.

As will be described in more detail below, the wind on the blades 16A, 16B, 16C rotates the first portion 13A of the housing 13 relative to the second portion 13B.

As mentioned, the blade pitch control assembly 15 comprises a hollow central hub 15A (FIG. 3), which comprises three main openings 18A, 18B and 18C, From the opening the respective blades 16A, 16B and 16C are fitted respectively and three sleeves 30A, 30B and 30C having their respective axes of rotation and substantially symmetry lines Z1, Z2 and Z3 protrude.

The following observations refer to the sleeve 30A and the respective blades 16A, but also apply to the other two sleeves 30B and 30C and the respective blades 16B and 16C.

The sleeve 30A is freely rotated about its own axis Z1 and supported on its respective bearing 40A inserted in the main opening 18A (FIGS. 3 and 4).

As shown in FIGS. 3 and 4, the sleeve 30A is coupled with its own electric motor 45A, and the output shaft of the electric motor is mechanically connected to the sun gear of its central planetary reduction gear 50A. .

Without departing from the scope of the present invention, it is evident that the central planetary reduction gear may have a rotating body or be configured differently if it performs the same function. For example, any other type of planetary reduction gear with a fixture and a rotary output shaft can be used.

More specifically, two pairs of spokes 61A, 62A are connected to an actuating system 61A of the sleeve 30A (including an electric motor 45A directly connected to the central planetary reduction gear 50A).

As shown in more detail in FIG. 4, the spokes 61A serve to secure the reduction gear 50A to the hollow central hub 15A, and the spokes 62A serve as the rotor of the central planetary reduction gear 50A. To mechanically connect the inner wall of the sleeve 30A.

As a variant of the two pairs of spokes 61A, 62A, if performing the same function, the central planetary reduction gear 50A is hollowed out by any other equivalent system of different geometry, such as a rigid or flexible fixing disk. It may be fixed to the sleeve 30A of the mold central hub 15A and the blade 16A.

The ends of the spokes 61A, 62A (or any other equivalent system) are secured to the hollow central hub 15A and the sleeve 30A, or simplify the installation and with the axis of rotation Z1 of the blade 16A. It can be fixed in a manner that corrects any errors in the alignment of the assembly axis (not shown) of the planetary reduction gear.

The reduction ratio between the steps of the central planetary reduction gear 50A and the number of reduction steps are selected according to the characteristics of the electric motor 45A, the sleeve 30A, and the blade 16A integral with the sleeve 30A.

The blade 16A (and the respective sleeve 30A integral with the blade) are rotated about the axis Z1 as follows.

[A] Wind data is immediately recorded by the anemometer 23.

[B] Wind data is sent to the electronic central control unit (CC) for processing.

[C] The electronic central control unit CC transmits a signal relative to the power unit (inverter) of the electric motor 45A, and the power unit is started and the spoke 62A (via the central planetary reduction gear 50A) and , The sleeve 30A and thus the blade 16A are rotated.

The rotation of the blade 16A about the rotational axis Z1 by the central planetary reduction gear 50A should be, for example, for positioning the profile of the blade 16A so as to make the best use of the wind, and its parameters. As mentioned, is recorded in advance by the anemometer 23 and processed by the electronic central control unit CC.

The main advantage of the blade pitch control assembly of the wind power generator according to the present invention is that the pitch control system of each blade has a reliable central planetary speed reduction gear, which is powered by its own electric motor, and thus the obvolution of the pivot ( And as a result eliminates the need for lubricating the pivot gears and any errors caused by poor registration of the pivot gears and pinions).

10: wind power generator 11: pylon
11A: Top 12: Nacelle
13: housing 14: bottom collar
15: Assembly 15A: Hollow Central Hub
16A, 16B, 16C: Blade 21: Electric Generator
22: antenna 23: anemometer
45A, 45B, 45C: electric motor
50A, 50B, 50C: Central planetary reduction gear
60 A, 60 B, 60 C: Operating system 61 A, 62 A: Spoke

Claims (3)

As assembly 15 for pitch control of blades 16A, 16B, 16C of wind generator 10,
The assembly 15 has a number of operating systems 60A, 60B, 60C acting on the blades 16A, 16B, 16C to position the blades 16A, 16B, 16C in a manner that makes maximum use of the wind. It has a hollow central hub (15A) to be coupled,
Each operating system 60A, 60B, 60C has its own electric motor 45A, 45B, 45C for its respective blades 16A, 16B, 16C, and each electric motor 45A, 45B, 45C with its own Each of the central planetary reduction gears 50A, 50B, 50C interposed between the blades 16A, 16B, 16C
Each blade 16A, 16B, 16C is coupled with its own electric motor 45A, 45B, 45C, and the output shaft of the electric motor is mechanically coupled to the sun gears of its respective central planetary reduction gears 50A, 50B, 50C. Connected to the
The assembly 15 has a first pair and a second pair of spokes 61A, 62A coupled to the actuation system of each blade 16A, 16B, 16C, the first pair of spokes 61A being a central planetary planet. The reduction gears 50A, 50B, 50C are fixed to the hollow central hub 15A, and the second pair of spokes 62A carry the planetary carriers of the central planetary reduction gears 50A, 50B, 50C to their respective blades 16A. Assembly mechanically connected to an inner wall of the sleeve (30A, 30B, 30C) to which 16B, 16C is fixed. The assembly according to claim 1, wherein said operating system (60A, 60B, 60C) is controlled by electronic means (CC). As the wind generator 10,
Pylon (11),
A nacelle 12 fitted to an upper end 11A of the pylon 11 and having an assembly 15 for controlling the pitch of the blades 16A, 16B, 16C of the wind generator,
A shaft 20 integrated with the assembly 15 and powering the electric generator 21;
Means 23 for recording a specific wind parameter and electronic means CC for processing said specific wind parameter,
The wind generator (10) is a wind generator, characterized in that the assembly (15) is an assembly (15) according to claim 1 or 2.

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