KR101995905B1 - Wind turbine and generator thereof - Google Patents

Abstract

The present invention provides a wind power generator and a power generation motor of a wind power generator capable of increasing initial maneuver performance of a wind power generator. The power generation motor of a wind power generator comprises: a main power generation unit including a main permanent magnet connected to a rotation shaft of a wind power generator to be rotatable, a main rotator providing a main electromagnet, and a main stator providing the main electromagnet to generate an electromotive force by rotation of the main rotator; and a sub power generation unit including a sub rotator providing a sub electromagnet connected to the rotation shaft to be rotatable, and a sub stator providing a sub permanent magnet where electromagnetic induction with the sub rotator is performed. The sub rotator can provide current to the main rotator to make the main electromagnet to be the main electromagnet during rotation of the rotation shaft.

Description

WIND TURBINE AND GENERATOR THEREOF <br> <br> <br> Patents - stay tuned to the technology WIND TURBINE AND GENERATOR THEREOF

The present invention relates to a power generating motor for a wind power generator and a wind power generator, which is capable of generating power even in a windy environment by minimizing cogging torque, .

The wind turbine generator is classified into a horizontal type and a vertical type according to the installation shape of the blade. Among these, the vertical type wind turbine has the advantage that it can generate power irrespective of the wind direction.

Since the wind turbine has a very large change in the relative angle of attack of the blade section rotating with respect to the direction of the wind, it is generally desirable to adopt an airfoil structure capable of maximizing the force of the direction vector component rotating the blade in the generated aerodynamic load component to be. In particular, permanent magnet generators requiring low RPM and high torque are widely used in wind power generation where output fluctuation is severe.

However, in the case of the conventional permanent magnet generator, since the cogging torque is high due to the high magnetic flux density of the permanent magnet and the magnetic field unbalance between the core and the permanent magnet, initial start-up may be difficult.

Accordingly, there is a demand for a technique capable of starting a power generation motor at a low wind speed by minimizing the cogging torque at the time of the initial start and realizing a stable operation of the power generation motor.

Patent Publication No. 10-2012-0131827 (2012.12.05 published)

Embodiments of the present invention provide wind turbines and wind turbine generators capable of improving the initial maneuverability of the wind turbine even in a windy environment.

According to an aspect of the present invention, a power generating motor of a wind power generator includes a main rotor that provides a main permanent magnet and a main electromagnet rotatably connected to a rotating shaft of a wind turbine generator, A main power generating unit including a main stator for providing a main electromagnet so as to be in contact with the main stator; And a sub-generator unit including a sub-stator for providing a sub-electromagnet rotatably connected to the rotation shaft, and a sub-stator for providing a sub-permanent magnet for electromagnetic induction with the sub-rotor, The rotor may provide a current to the main electromagnet for electromagnetizing the main electromagnet upon rotation of the rotating shaft.

At this time, the power generation motor includes a power generation case; Wherein the sub-stator is fixed to the inner side of the sub-stator so that the sub-stator is opposed to the main stator and the main rotor is fixed to the outer side of the rotary stator so as to be opposed to the main stator, ; A sensor for measuring a frequency value generated by the main permanent magnet when the rotating shaft rotates; And a control unit that determines that a failure has occurred in the power generation motor when the frequency value measured by the detection sensor is lower than a predetermined lower limit value when the rotation shaft rotates and if the frequency value measured by the detection sensor is higher than a predetermined upper limit value , And a controller that determines that the rotating shaft is in an overspeed state.

Further, the power generation motor may include a display for indicating whether the power generation motor is malfunctioning or not; And a caliper for providing a frictional force to the rotating shaft for stopping the rotating shaft, wherein the controller displays a failure state of the power generation motor through the display when it is determined that the power generation motor is in a failure state, And provide a stop signal to the caliper to stop the rotating shaft if it is determined that the shaft is overspeed.

According to an aspect of the present invention, there is provided a wind turbine including a rotating shaft, at least one main blade rotatably installed on the rotating shaft, and a wind turbine including a power generating motor for generating electric energy using the rotating force of the rotating shaft A generator body; And a tower for supporting the main body of the wind power generator, wherein the power generation motor includes a main rotor for providing a main permanent magnet and a main electromagnet rotatably connected to the rotation shaft, A main power generating unit including a main stator for providing a main electromagnet to be generated; And a sub-generator unit including a sub-stator for providing a sub-electromagnet rotatably connected to the rotation shaft, and a sub-stator for providing a sub-permanent magnet for electromagnetic induction with the sub-rotor, The rotor may provide a current to the main electromagnet for electromagnetizing the main electromagnet upon rotation of the rotating shaft.

At this time, the power generation motor includes a power generation case; Wherein the sub-stator is fixed to the inner side of the sub-stator so that the sub-stator is opposed to the main stator and the main rotor is fixed to the outer side of the rotary stator so as to be opposed to the main stator, ; A sensor for measuring a frequency value generated by the main permanent magnet when the rotating shaft rotates; And a control unit that determines that a failure has occurred in the power generation motor when the frequency value measured by the detection sensor is lower than a predetermined lower limit value and if the frequency value measured by the detection sensor is higher than a predetermined upper limit value, It is possible to further include a controller for judging that there is a difference.

The embodiments of the present invention can minimize the cogging torque and enable the start-up of the power generation motor even at low wind speed, so that there is an advantage that the power generation efficiency of the power generation motor can be improved.

The embodiments of the present invention can promptly cope with an emergency situation by quickly detecting a failure of a power generation motor or an overspeed of a rotary shaft without a separate device for measuring the rpm of the rotary shaft, .

1 is a perspective view illustrating a wind turbine according to an embodiment of the present invention.
FIG. 2 is an enlarged perspective view of the power generating motor of the wind power generator shown in an enlarged scale of the "A" portion of FIG.
3 is a cross-sectional view cut along the line BB of Fig.
FIG. 4 is a cutaway perspective view of a power generating motor of a wind turbine according to an embodiment of the present invention.
5 is a block diagram illustrating control logic of a wind turbine in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention. However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

And terms including ordinals such as first, second, etc. may be used to describe various elements, but the constituent elements are not limited by such terms. These terms are used only to distinguish one component from another. It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

1 is a perspective view illustrating a wind turbine according to an embodiment of the present invention.

1, a wind power generator according to an embodiment of the present invention may include a rotating shaft 10, a wind power generator main body 1, and a tower 60. As shown in Fig. At this time, the main body 1 of the wind turbine generator 1 may include a rotating shaft 10, a main blade 20, a sub blade 30, a generator motor 100 and a stationary bracket 50.

Specifically, the rotary shaft 10 can be vertically installed via the generator motor 100 so as to be rotatable at the top of the tower 60. [ Since the main blade 20 and the sub blade 30 are symmetrically connected to the rotating shaft 10 with respect to the center of rotation, they can be smoothly rotated corresponding to various wind directions.

The rotating shaft 10 can be drive-connected to the power generation motor 100. Accordingly, when the rotating shaft 10 is rotated by the wind force, the rotational force of the rotating shaft 10 can be converted into electric energy through the electric power generating motor 100. [

The main blades 20 may be provided at a plurality of positions located at the same radial distance from the rotating shaft 10. The plurality of main blades 20 can be spaced equidistantly in the circumferential direction of the rotary shaft 10 while maintaining the same distance from the rotary shaft 10. [

The main blade 20 may be pultruded to produce a winged airfoil having a rounded head and a sharp tail. At this time, since the material of the main blade 20 is made of a magnesium alloy which is lighter than an aluminum alloy material, energy efficiency due to weight reduction in wind power generation can be improved.

The sub-blade 30 may be provided with a plurality of links connecting the rotating shaft 10 and the main blade 20. [ The plurality of sub-blades 30 can stably support the main blade 20 at the rotary shaft 10 by connecting the rotary shaft 10 and the main blade 20 in the form of a truss structure.

At this time, the sub-blade 30 is disposed in a direction opposite to the head of the main blade 20, thereby increasing the lift force or increasing the drag in accordance with the wind direction. The stationary bracket 50 can connect between the end of the sub-blade 30 and the outer surface of the main blade 20.

The power generation motor 100 is a rotor assembly that generates electricity through an electromagnetic induction action between a rotor and a stator, and can generate electrical energy using the rotational force of the rotating shaft 10. [ Details of the power generation motor 100 will be described later.

At this time, since the power generation motor 100 is located at the center of gravity of the wind power generator, the structural stability of the wind power generator can be secured from the strong wind. In addition, since the length of the rotating shaft 10 that transmits the rotating force can be relatively short, the weight of the rotating shaft 10 can be made lighter, as compared with the case where the power generating motor is located at the bottom of the wind power generator.

The tower 60 may be composed of a plurality of support pipes successively and vertically connected to a support for supporting the rotating shaft 10, the main blade 20, the sub-blade 30 and the power generation motor 100. The tower 60 can be connected to the rotary shaft 10 via the power generation motor 100.

Fig. 2 is an enlarged perspective view of a power generating motor of a wind turbine shown in an enlarged scale in Fig. 1, and Fig. 3 is a cross-sectional view cut along the line BB of Fig. FIG. 5 is a block diagram illustrating a control logic of a wind turbine generator according to an embodiment of the present invention. Referring to FIG.

2 to 5, a power generation motor 100 according to an embodiment of the present invention includes a power generation case 130, a main power generation unit 110, a sub power generation unit 120, a rotation piece 150 ), A sensing sensor 160, a display 180, a caliper 190, and a controller 170.

Specifically, the power generating case 130 is a housing for protecting electronic components for converting the rotational force of the rotating shaft 10 into electric energy, and may be installed between the lower end of the rotating shaft 10 and the upper end of the tower 60 have.

The power generation case 130 may be provided with an inner space in which the lower end of the rotating shaft 10 is rotatably mounted. The main power generation unit 110, the sub power generation unit 120, the rotation piece 150, the detection sensor 160, and the controller 170 may be provided in the inner space. A caliper 190 may be mounted on the lower portion of the power generation case 130.

The main power generation unit 110 can convert the kinetic energy of the rotating shaft 10 into electrical energy when the rotating shaft 10 rotates. The main generator unit 110 includes a main rotor 111 rotatably connected to the rotary shaft 10 of the wind power generator and a main stator 112 for generating electromotive force by rotation of the main rotor 111. [ ).

In particular, the main rotor 111 may comprise a main electromagnet 111b and a main permanent magnet 111a providing a minimum cogging torque. The main permanent magnet 111a is smaller than the main electromagnet 111b and provides a minimum cogging torque, so that the start-up of the power generation motor 100 is possible even at a low wind speed.

For example, when the rotating shaft 10 of the power generation motor 100 is slowly rotated, the torque does not smoothly return but varies nonuniformly. At this time, the difference between the maximum torque variation and the smallest torque variation can be defined as caulking torque Generally, the larger the cogging torque, the larger the output. However, if the cogging torque is large, it may be difficult to start the motor at low wind speed. Therefore, by configuring the main permanent magnet 111a that provides the minimum cogging torque with at least a portion of the main rotor 111, it is possible to improve the initial maneuverability of the wind turbine even in a windy environment.

The main power generating unit 110 can output the minimum frequency value using the main permanent magnet 111a without supplying current from the sub rotors 121 when the rotating shaft 10 rotates.

Accordingly, when the main power generator unit 110 outputs the minimum frequency value by the main permanent magnet 111a at the time of rotation (start) of the rotary shaft 10, the controller 170 causes the power generator motor 100 to malfunction (For example, when the sub power generation unit 120 is damaged). This is because power is not generated in the main electromagnet 111b when the sub power generation unit 120 is damaged, so that the main power generation unit 110 can generate power only by the main permanent magnet 111a.

Since the frequency value output by the main permanent magnet 111a is proportional to the RPM of the rotating shaft 10 when the rotating shaft 10 rotates, the main power generating unit 110 rotates at a rotational speed of the rotating shaft 10 It is possible to output the frequency value of the main permanent magnet 111a proportional thereto.

The sub power generation unit 120 may include a sub stator 121 rotatably connected to the rotating shaft 10 and a sub stator 122 through which electromagnetic induction with the sub rotors 121 is performed. At this time, the sub rotors 121 are composed of sub electromagnets, and the sub stator 122 may be composed of sub-permanent magnets. The sub-rotor 121 may be connected to the main rotor 111 through a rectifier.

The sub rotator 121 can supply the electric current generated through the electromagnetic induction with the sub stator 122 to the main electromagnet 111b of the main rotor 111 and the main rotor 111 can rotate the sub- And can be electroplated using the current supplied from the electron 121.

The rotation piece 150 may be rotatably disposed in the power generation case 130 so as to be rotated in conjunction with the rotation shaft 10. A sub rotator 121 may be fixed to the inside of the rotating piece 150 so as to face the sub stator 122 and a main rotor 111 Can be fixedly installed.

The detection sensor 160 may be constituted by a sensor for measuring a frequency value generated by the main permanent magnet 111a when the rotation shaft 10 rotates. The sensing sensor 160 may apply the measured frequency value from the main permanent magnet 111a to the controller 170. [

The display 180 may receive an operation signal from the controller 170 and inform the user of the operation. To this end, the display 180 may be provided in various forms for indicating an operating signal of the controller 170 (for example, a current state of the power generation motor, a failure state, or the like). For example, the display 180 may be provided in the form of an LED plate, a warning light or an indicator light.

The caliper 190 may receive a stop signal from the controller 170 and provide a frictional force to the disk 11 of the rotary shaft 10 to stop the rotary shaft 10. [ Since the caliper 190 corresponds to a conventional caliper structure for selectively restraining the disk 11 of the rotary shaft 10, a detailed description thereof will be omitted.

The controller 170 can entirely control the configuration of the power generation motor 100 for generating kinetic energy of the rotating shaft 10 as electric energy. Particularly, when the rotating shaft 10 rotates, the controller 170 determines whether the generator motor 100 is malfunctioning (for example, when the generator 100 is in the off-state or not) via the frequency value of the main permanent magnet 111a measured by the detection sensor 160 The failure of the power generation unit) and the overspeed state of the rotating shaft 10 can be determined.

For example, the controller 170 determines that a failure has occurred in the power generation motor 100 when the frequency value measured by the detection sensor 160 is lower than a predetermined lower limit value, Can be displayed. Here, the predetermined lower limit value is understood as a frequency value output from the main permanent magnet 111a only when the main electromagnet 111b fails to generate power due to a failure of the power generation motor 100 (damage of the sub power generation unit) .

The controller 170 determines that the rotation shaft 10 is in the overspeed state when the frequency value measured by the detection sensor 160 is higher than the preset upper limit value and sends a stop signal for stopping the rotation shaft 10 to the caliper 10. [ (Not shown). Here, the predetermined upper limit value can be understood as a frequency value expected to be outputted from the main power generation unit 110 at the time of over-speed rotation (start-up) of the rotary shaft 10. [

For example, when the maximum frequency (upper limit) of the main permanent magnet 111a is set to 70 rpm (93 rpm), if the frequency of the main permanent magnet 111a exceeds 70 Hz due to overspeed of the rotating shaft , 93 Hz), the controller 170 provides a stop signal to the caliper 190 to stop the rotating shaft 10 after determining that the rotating shaft 10 is in an overspeed state.

Hereinafter, the operation of the present invention will be described.

First, when the rotating shaft 10 is rotated by the wind, the sub power generating unit 120 can generate current through electromagnetic induction between the sub rotator 121 and the sub stator 122. The electric current generated by the sub power generation unit 120 is supplied to the main electromagnet 111b of the main rotor 111 to electromagnetize the main electromagnet 111b.

When the main electromagnet 111b is electromagnetized by the sub rotor 121, the main stator 112 can generate electromotive force through electromagnetic induction between the main electromagnet 111b and the main permanent magnet 111a. Particularly, even when the wind speed is low and the wind speed is low, the main permanent magnet 111a only provides the minimum caulking torque, so that the main power unit 110 can be rotated by the main stator 112 and the main rotor (111). &Lt; / RTI &gt;

On the other hand, when the power generation motor 100 fails (for example, when the sub power generation unit fails), only the main permanent magnet 111a can generate power. At this time, ), The controller 170 can determine that a failure has occurred in the power generation motor 100. In this case, If it is determined that a failure has occurred in the power generation motor 100, the controller 170 can display the failure state of the power generation motor 100 through the display 180. [

If the frequency value outputted through the main permanent magnet 111a is higher than the predetermined upper limit value when the rotating shaft 10 is in the overspeed state and the controller 170 determines that the rotating shaft 10 is in the overspeed state, And provide a stop signal to the caliper 190 to stop the rotating shaft 10. [

As described above, according to the present embodiment, the cogging torque can be minimized and the starting of the power generation motor can be started even at a low wind speed, so that the power generation efficiency of the power generation motor can be improved. It is possible to promptly detect a failure or an overspeed of the rotating shaft, to cope with an emergency situation promptly, and to realize stable power generation.

It is to be understood that the embodiments described above are merely illustrative of some examples of the technical idea and the scope of the technical idea is not limited to the described embodiments, It will be understood that various changes, substitutions, and alterations may be made therein without departing from the spirit and scope of the invention.

100: power generation motor 110: main power generation unit
111: main rotor 112: main stator
120: Sub power generation unit 121: Sub-
122: Sub-stator 130: Power generation case
160: Detection sensor 170: Controller
180: display 190: caliper

Claims (5)

A main stator for providing a main electromagnet for generating an electromotive force by rotation of the main rotor, and a main stator for providing a main electromagnet for generating an electromotive force by rotation of the main rotor, ;
A sub-generator unit including a sub-stator for providing a sub-electromagnet rotatably connected to the rotating shaft, and a sub-stator for providing a sub-permanent magnet for electromagnetic induction with the sub-rotor;
Generating case;
Wherein the sub-stator is fixed to the inner side of the sub-stator so that the sub-stator is opposed to the main stator and the main rotor is fixed to the outer side of the rotary stator so as to be opposed to the main stator, ;
A sensor for measuring a frequency value generated by the main permanent magnet when the rotating shaft rotates; And
When a frequency value measured by the detection sensor is lower than a predetermined lower limit value when the rotation shaft rotates, it is determined that a failure has occurred in the power generation motor. If the frequency value measured by the detection sensor is higher than a predetermined upper limit value, And a controller that determines that the rotating shaft is in an overspeed state. The method according to claim 1,
And the sub-rotor provides a current for electromagnetizing the main electromagnet to the main electromagnet when the rotation shaft rotates. The method according to claim 1,
A display for indicating whether the power generation motor is faulty; And
Further comprising a caliper for providing a frictional force to the rotating shaft to stop the rotating shaft,
The controller
Wherein the control unit displays a failure state of the power generation motor through the display when it is determined that the power generation motor is in a failure state and outputs a wind signal to the caliper to stop the rotation shaft when the rotation shaft is determined to be in an overspeed state. Generating motor of generator. At least one main blade rotatably installed on the rotary shaft, and a generator motor for generating electric energy by using the rotational force of the rotary shaft; And
And a tower for supporting the wind power generator main body,
The power generation motor
A main rotor for providing a main permanent magnet and a main electromagnet rotatably connected to the rotary shaft, and a main stator for providing a main electromagnet to generate an electromotive force by rotation of the main rotor;
A sub-generator unit including a sub-stator for providing a sub-electromagnet rotatably connected to the rotating shaft, and a sub-stator for providing a sub-permanent magnet for electromagnetic induction with the sub-rotor;
Generating case;
Wherein the sub-stator is fixed to the inner side of the sub-stator so that the sub-stator is opposed to the main stator and the main rotor is fixed to the outer side of the rotary stator so as to be opposed to the main stator, ;
A sensor for measuring a frequency value generated by the main permanent magnet when the rotating shaft rotates; And
Wherein when the measured frequency value is lower than a predetermined lower limit value, it is determined that a failure has occurred in the power generation motor. If the frequency value measured by the detection sensor is higher than a predetermined upper limit value, The wind turbine generator comprising: 5. The method of claim 4,
The sub-
And provides the main electromagnet with a current for electromagnetizing the main electromagnet when the rotation shaft rotates.

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