CN103899488A - Wind Turbines - Google Patents

Abstract

The wind driven generator comprises blades (1), a generator rotor (2), a generator stator (3), a brake disc (4), a linkage mechanism (5), a tail wing (6) and an electromagnetic brake device (8), wherein the blades (1) and the generator rotor (2) are arranged on the motor stator (3); the brake disc (4) is arranged opposite to the generator rotor (2) and is connected with the linkage mechanism (5); the brake disc (4), the linkage mechanism (5) and the tail wing (6) form a first brake system; the electromagnetic brake device (8) forms a second brake system which is connected with the generator stator (3); the wind driven generator is braked by one of the first brake system and the second brake system. The wind driven generator is provided with two sets of brake systems, when braking is needed, one of the first brake system and the second brake system can be used for braking, even if one brake system breaks down, the other brake system can be used for braking, and the running safety of the fan is improved.

Description

Wind Turbines

technical field

The invention relates to wind power generation technology, in particular to design a wind power generator with a brake system with simple structure and high stability.

Background technique

Wind turbines are usually installed in areas rich in wind resources, such as high-altitude areas or coastal areas, where the wind speed is usually relatively high, while traditional wind turbines often fail due to overload under strong winds because there is no speed limit or braking device. The generator is damaged.

In order to prevent wind turbines from being damaged due to overload under strong winds, the technical means usually adopted by technicians is to install speed limiting devices or braking devices for wind turbines. For example, the Chinese Utility Model Patent No. CN200920116665.3 discloses a brake device for wind power generators, which can force the brake disc to stop rotating when the speed of the wind wheel exceeds the rated speed through an elastic pressing device, so that the wind turbine The wheel shaft stops rotating, and then the wind generator stops working, so as to prevent the wind generator from being damaged by strong wind. However, it has been found that this braking device is not only complex in structure, but also has a long-term braking reliability limited by the fatigue strength of the elastic body due to its simple elastic mechanical braking method.

Contents of the invention

In view of the above problems, the present invention provides a wind power generator with a braking system with a simple structure and high stability.

The wind power generator provided by the present invention includes a blade (1), a generator rotor (2), a generator stator (3), a brake disc (4), a linkage mechanism (5), an empennage (6) and an electromagnetic brake device (8) , wherein the blades (1) and the generator rotor (2) are arranged on the generator stator (3); the brake disc (4) is arranged opposite to the generator rotor (2), and The linkage mechanism (5) is connected; the brake disc (4), the linkage mechanism (5) and the empennage (6) constitute the first braking system; the electromagnetic braking device (8) constitutes the second braking system, which is connected with the The generator stator (3) is connected; the wind generator is braked by one of the first braking system and the second braking system.

The wind power generator provided by the present invention has two sets of brake systems. When braking is required, one of the first brake system and the second brake system can be used for braking. Even if one of the brake systems fails, the other can be used for braking. Braking brakes increase the safety of fan operation.

As an example, the linkage mechanism (5) pushes the brake disc (4) to move forward along the axial direction of the generator stator (3) under the action of the empennage (6) to prevent the generator Rotor (2) rotates

According to this embodiment, when the wind speed is very high, under the action of the wind force, the empennage rotates around the axis of rotation and acts on the linkage mechanism to push the brake disc close to the generator rotor through the linkage mechanism, and through the contact between the brake disc and the generator rotor Friction brakes to prevent wind turbines from being damaged by strong winds.

As an embodiment, the above linkage mechanism (5) includes: a base (50), which is fixed on the generator stator (3), and a rotating shaft (51) is arranged on the base (50); a swing rod (52 ), which is fixed on the rotation shaft (51) and can rotate around the rotation shaft (51), the swing rod (52) has a swing rod push column (53) at one end; the connecting rod (54), Its one end is connected with the swing rod (52) and can rotate relative to the swing rod (52); the crank slider mechanism (55) has one end connected with the connecting rod (54) and the other end connected with the The brake disc (4) is connected.

According to this embodiment, the braking system of the wind turbine is simplified by setting a linkage mechanism with a simple structure, and the stability of the braking system is improved.

As an embodiment, the wind generator further includes: a wind turbine speed detection unit, a control unit (7) and an electromagnetic brake device (8), wherein the wind turbine speed detection unit is used to detect the speed of the wind power generator, and The detected fan speed is sent to the control unit; the control unit (7) is used to control the electromagnetic brake device (8) to brake according to the detected fan speed.

According to this embodiment, the fan speed is detected by the fan speed detection unit, and when the fan speed suddenly increases (that is, the wind speed suddenly increases), the electromagnetic brake device can be used to brake, so as to prevent the wind turbine from being damaged by strong wind. By arranging the electromagnetic braking device, it can cooperate with the aforementioned mechanical braking device to better protect the wind power generator.

Description of drawings

Fig. 1 is a schematic structural view of a wind generator according to an embodiment of the present invention;

Fig. 2 is a top view of the wind generator shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the linkage mechanism.

Detailed ways

In order to enable those skilled in the art to better understand the technical solution of the present invention, the wind power generator provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. In these drawings, the same reference numerals are attached to the same or corresponding parts.

The structure of an embodiment of the wind power generator of the present invention is described with reference to FIGS. 1 to 3 . The following is only the best embodiment of the wind power generator of the present invention, and the present invention is not limited to the following structures.

Fig. 1 is a schematic structural diagram of a wind power generator according to an embodiment of the present invention. Fig. 2 is a top view of the wind power generator shown in Fig. 1 . As shown in FIG. 1 and FIG. 2 , the wind power generator includes a blade 1 , a generator rotor 2 and a generator stator 3 . The blade 1 and the generator rotor 2 are set on the generator stator 3 and can rotate around the generator stator 3 . The blade 1 rotates under the action of the wind, and drives the generator rotor 2 to rotate. There is a strong permanent magnet inside the generator rotor, so that the magnetic field of the generator rotates. The coil in the generator stator 3 cuts the magnetic field lines to generate electric energy. Thereby converting wind energy into electrical energy and realizing wind power generation.

In order to prevent the wind power generator from being damaged by strong wind, the wind power generator of the present invention is provided with a first braking system and a second braking system, i.e. a mechanical braking system and an electromagnetic braking system, through which the wind power generator can be effectively protected, Protect from damage by strong winds.

The mechanical braking system of the wind power generator of the present invention includes a brake disc 4, a linkage mechanism 5 and an empennage 6, the brake disc 4 is arranged relative to the generator rotor 2 and is connected with the linkage mechanism 5, and the empennage 6 can rotate around the rotating shaft 7 under the action of wind force, And when the empennage 6 is in contact with the linkage mechanism 5 , it can push the brake disc 4 to move axially along the generator stator 3 to approach the generator rotor 2 .

As shown in FIG. 1 , the brake disc 4 is mounted in a hollow disc and is sleeved on the generator stator 3 .

As shown in FIG. 3 , the linkage mechanism 5 of the mechanical braking system of the wind power generator of the present invention includes a base 50 , a swing rod 52 , a connecting rod 54 and a slider crank mechanism 55 . The base 50 is fixed on the stator 3 of the generator, and a rotating shaft 51 is arranged on the base 50 . The swing rod 52 is connected to the rotating shaft 51 and can rotate around the rotating shaft 51 . The connecting rod 54 is respectively connected with the swing rod 52 and the slider crank mechanism 55 , and the connecting rod 54 is movably connected with the swing rod 52 and the slider crank mechanism 55 . The slider crank mechanism 55 is connected with the brake disc 4 .

The empennage 6 is installed at the eccentric position of the wind generator, and when the wind blows, the wind pressure on both sides of the empennage is different, causing the empennage to produce a torque towards the central position. This torque drives the linkage to brake and simultaneously drives the windward side of the wind turbine away from the positive wind direction.

The braking process of the mechanical braking system of the wind power generator of the present invention is as follows: under the action of wind force, the empennage 6 rotates around the axis of rotation. The rod 52 rotates, the swing rod 52 rotates to drive the connecting rod 54 to rotate, and the rotation of the connecting rod 54 drives the slider 55 to move forward, so that the slider 55 pushes the brake disc 4 close to the generator rotor 2, and the brake disc 4 and the generator rotor The friction force between 2 realizes braking.

The electromagnetic braking system of the present invention includes a fan speed detection unit, a control unit 7 and an electromagnetic brake device 8, wherein the fan speed detection unit is used to detect the speed of the wind generator, and sends the detected fan speed to the control unit 7; The unit 7 is used to control the electromagnetic braking device 8 to perform braking according to the fan speed. The electromagnetic braking device 8 is used to limit the rotational speed of the generator rotor (2), and its essence is to automatically short-circuit the output line of the generator when receiving the braking command from the control unit, so that the wind turbine is in the state of electromagnetic braking.

In the wind power generator of the present invention, when the wind force increases instantaneously, the electromagnetic braking system automatically connects the excitation braking circuit, so that the instantaneous braking torque of the generator is increased to ensure the stability of the fan speed; when the wind force increases steadily to a certain speed At the same time, the mechanical brake system adopts the yaw system to automatically adjust the windward angle of the fan, reduce the effective wind driving torque, and stabilize the running speed of the fan, thereby effectively protecting the generator from damage at the same time. During the operation of the fan, the mechanical brake system and the electromagnetic brake control system control the brake of the fan at the same time. Therefore, if one of the systems fails, there is still another system to control the fan, thus ensuring the safe and reliable operation of the fan.

The above embodiments are only exemplary embodiments adopted to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (8)

1. a wind-driven generator, is characterized in that, comprises blade (1), generator amature (2), generator unit stator (3), brake disc (4), linking mechanism (5), empennage (6) and electromagnetic brake device (8), wherein

Described blade (1) and generator amature (2) are arranged on described generator unit stator (3);

Described brake disc (4) and described generator amature (2) opposite disposed, and be connected with described linking mechanism (5);

Described brake disc (4), linking mechanism (5) form first brake system with, empennage (6);

Described electromagnetic brake device (8) forms the second brake system, and it is connected with described generator unit stator (3);

By described first brake system and the second brake system, one of them brakes described wind-driven generator.

2. wind-driven generator as claimed in claim 1, it is characterized in that, described linking mechanism (5) described empennage (6) effect lower promote described brake disc (4) along described generator unit stator (3) axially move forward stop described generator amature (2) to rotate.

3. wind-driven generator as claimed in claim 1, is characterized in that, described electromagnetic brake device (8) brakes by the rotating speed of restriction generator amature (2).

4. the wind-driven generator as described in claim 1-3 any one, is characterized in that, described brake disc 4 is hollow disc dress, and it is sleeved on described generator unit stator (3).

5. the wind-driven generator as described in claim 1-3 any one, is characterized in that, described linking mechanism (5) comprising: base (50), fork (52), connecting rod (54) and slidercrank mechanism (55), wherein

It is upper that described base (50) is fixed on described generator unit stator (3), and on described base (50), be provided with running shaft (51);

Described fork (52) is fixed on described running shaft (51) above and can be around described running shaft (51) rotation, and described fork (52) is formed with fork and pushes away post (53) in one end;

Described connecting rod (54) one end is connected with described fork (52), and the other end is connected with described slidercrank mechanism (55), and described connecting rod (54) is and is flexibly connected with described fork (52) and described slidercrank mechanism (55);

It is mobile that described slidercrank mechanism (55) promotes described brake disc (4) under described fork (52) and connecting rod (54) effect.

6. wind-driven generator as claimed in claim 5, it is characterized in that, described crank block (55) comprises slide block and guide rail, described guide rail is fixed on described generator unit stator (3), described slide block is connected with described connecting rod, and under described connecting rod effect, slide along described guide rail, thereby near or away from described brake disc (4).

7. the wind-driven generator as described in claim 1-3 any one, it is characterized in that, described empennage (6) can rotate around running shaft (9) under wind-force effect, and it is mobile with close described generator amature (2) in the time that described empennage (6) contacts with described linking mechanism (5), can to promote described brake disc (4).

8. the wind-driven generator as described in claim 1-3 any one, is characterized in that, also comprises rotation speed of fan detection unit, control unit (7), wherein

Described rotation speed of fan detection unit is for detection of the rotating speed of wind-driven generator, and detected rotation speed of fan is sent to described control unit (7);

Described control unit (7) is for braking according to electromagnetic brake device (8) described in detected rotation speed of fan control.

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