KR101714498B1 - Tracking photovoltaic power generation device - Google Patents

Abstract

The tracking solar photovoltaic generation apparatus includes a first support, a rotation shaft rotatably coupled to the first support, a rotation axis to which a toggle bar extending in a radial direction is fixedly mounted, a free end of the toggle bar, And a fixed support having a fixed length and having a length adjustable and fixed at one end thereof on the rotary shaft, and a second support rod A photovoltaic module hinged to the variable strut and the other end of the fixed strut of the photovoltaic module support bar and mounted obliquely with respect to the longitudinal direction of the rotating shaft; And a controller for controlling the rotation of the rotary shaft from the first position to the second position by rotating the toggle bar by controlling the driving of the power cylinder.

Description

[0001] The present invention relates to a tracking photovoltaic power generation device,

The present invention relates to a tracking solar photovoltaic power generation apparatus, and more particularly to a tracking solar power generation apparatus capable of automatically adjusting the solar altitude in response to a rapidly changing solar altitude, and manually adjusting the solar altitude during the year, The present invention relates to a tracking type photovoltaic device capable of greatly improving the efficiency of photovoltaic generation while simplifying the structure as much as possible.

The importance of electric energy in modern civilized society is unbelievably high, and stable supply of electric energy is an important axis in national energy policy. In addition, the problem of environmental destruction and environmental pollution must be solved in addition to the stable supply of electric energy. In this regard, it is necessary to solve the problems of renewable energy such as thermal power generation, nuclear power generation and hydroelectric power generation, Energy development is urgent.

Renewable energy refers to new energy such as liquefied coal, hydrogen energy, and energy that converts plants and animals into organic and renewable energy using sunlight, wind, water, and geothermal energy. Energy is a clean energy that can be supplied almost indefinitely, and it is attracting great attention because it can be practically used at the present level of technology.

Solar power generation uses solar energy that convert sun's radiant energy into heat energy and solar power that converts solar energy directly into battery energy. In particular, it uses solar cells made of materials such as semiconductors, dyes, and polymers Photovoltaic generation, which generates electricity directly in response to sunlight, is attracting attention as a technology best suited to future growth industries because its efficiency can be continuously improved with the development of materials.

However, since there is a limitation that solar power generation is greatly influenced by the topography condition and the amount of sunshine as well as the limit of the energy conversion efficiency itself, various methods are being sought to overcome this.

In addition, the efficiency of solar power generation is influenced not only by the amount of sunshine but also by the angle of the sunlight incident on the solar module, that is, the altitude of the sun. This is because when the angle of incidence of solar light on the surface of the solar module is at right angles, It can receive energy.

Here, because the altitude of the sun changes by the earth's orbit by season and by the rotation by the sunrise and sunset, it is necessary for the solar module to receive the sunlight vertically, An installation stand is required.

In this way, it is said that the method of installing the solar module to move along the sun is a tracking type. This method requires a separate power source for the automatic tracking operation, a sensing sensor, and a control program, so that the structure is complicated, There is a disadvantage in that it takes up a relatively large area due to an increase in burden and maintenance cost and a shading due to the movement of the photovoltaic module. In case of 2-axis tracking system, it takes more than twice the area due to the general shading problem than the fixed type. Therefore, in the case of large-capacity solar power plant, the power generation amount is less than 50% of the area. In other words, the tracking formula takes the sunlight at a right angle and increases the power generation efficiency by up to 35%. However, the installation area is more than 2 times in order to solve the shading problem, so the installation cost is expensive and the power generation efficiency is low. .

A semi-fixed type solar module has been developed which is able to manually adjust the solar module inclination angle on a monthly or season basis, ignoring changes in sunlight altitude due to the disadvantage of the tracking method (Patent Document 1) Fixed type fixed installation with the inclination angle which obtains the optimum efficiency when seeing as a whole in the place where influence is small is widely used.

However, since the tracking system is the most efficient in terms of the efficiency of photovoltaic power generation, the system structure is complicated, the maintenance and operation costs are high, and the problem of shading is minimized, so that if equally number of photovoltaic modules are installed in a fixed- It is possible to obtain the maximum efficiency per unit installation area by covering the tracing formula and it can be widely spread as the most preferable installation method.

Korean Patent Laid-Open Publication No. 2014-0119281 (published Oct. 10, 2014)

The present invention relates to a method of installing a fully automated tracking type photovoltaic module and a semi-fixed type photovoltaic module, thereby installing a photovoltaic module having the same area and the same area as a fixed photovoltaic installation area, And an object thereof is to provide a photovoltaic power generation device.

A tracking photovoltaic device according to the present invention includes: a first support; a rotation shaft rotatably coupled to the first support, the rotation axis of which a toggle bar extending in the radial direction is fixedly mounted; And a fixed support having a fixed length and being fixed at one end thereof on the rotary shaft and a fixed support having a fixed length, A photovoltaic module support bar hinged to the variable strut and the other end of the fixed strut of the photovoltaic module support bar and mounted obliquely to the longitudinal direction of the rotating shaft; And a controller for controlling the rotation of the rotary shaft from the first position to the second position by rotating the toggle bar by controlling the driving of the power cylinder.

According to another aspect of the present invention, there is provided an electronic apparatus comprising: a first support; a rotation shaft rotatably coupled to the first support, the rotation axis of which a toggle bar extending in the radial direction is fixedly mounted; A power cylinder rotatably mounted on the first support and having a telescopic rod hinged to a free end, a variable length adjustable strut having one end fixed to the rotating shaft, A photovoltaic module support bar hinged to the variable strut and the other end of the fixed strut of the photovoltaic module support bar and mounted obliquely with respect to the longitudinal direction of the rotating shaft; And a controller for controlling the rotation of the rotary shaft from the first position to the second position by rotating the toggle bar by controlling the driving of the power cylinder.

In one embodiment of the present invention, the first position of the rotation axis is a position at which the solar module observes the sun in the present invention, and the second position is a position at which the solar module looks at the sun at sunset.

Here, it is preferable that the surface of the photovoltaic module in the first and second positions is perpendicular to the above-described aspect.

Meanwhile, the controller includes a GPS sensor, calculates a sunrise and sunset time according to latitude, longitude information and time information received by the GPS sensor, and controls the rotation axis for the time from the calculated sunrise time to sunset time, 1 position to the second position.

Here, the controller may control the rotation axis to rotate at a constant speed from the first position to the second position.

On the other hand, the variable strut includes a variable strut table fixed on the rotating shaft and a variable strut mounted to be slidable with respect to the variable strut table, An identifier indicative of the fixed position of the variable support rod that makes it perpendicular to the sun in the month may be displayed.

According to an embodiment of the present invention, there is provided a plurality of solar module supporting rods and solar modules, wherein the first supporting rods support the intermediate portion of the rotating shaft rotatably, and at both ends of the rotating shaft, And an auxiliary support for rotatably supporting the support is provided.

The photovoltaic module includes two photovoltaic modules arranged in series along the longitudinal direction of the photovoltaic module. The photovoltaic module is connected to the other end of the variable strut and the fixed strut, And may be arranged obliquely with respect to the longitudinal direction.

The photovoltaic module may further include a supplementary fixture for fixing the two photovoltaic modules crossing each other.

Here, the auxiliary fixing table is formed by intersecting two plates in an X shape, and the other end of the variable support and the fixed support may be coupled to any one of the plates.

In addition, at least one universal joint may be provided on the rotary shaft, and the universal joint may be a constant velocity joint.

The tracking solar photovoltaic device of the present invention has a semi-fixed type that can be manually adjusted for the daytime solar altitude at which the sun altitude is changing rapidly, and can be manually adjusted for the yearly sun altitude, which changes relatively slowly according to the earth's orbit By grafting, the efficiency of solar power generation can be greatly improved while simplifying the structure as much as possible.

In addition, the present invention can be applied to a solar module, which is based on a sunrise / sunset time that is automatically calculated by a GPS signal without applying a sensor or a complicated control program for detecting the position of the sun when automatically tracking the sun's altitude So that the configuration is simpler than that of the prior art, and the installation and maintenance cost is greatly reduced.

In addition, when manually adjusting the installation angle of the photovoltaic module with respect to the solar altitude during the year, it can be adjusted to the mark indicated by the monthly mark, so that it is easy to intuitively adjust the installation angle without needing to make a measurement measurement or calculation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing the overall configuration of a tracking type photovoltaic apparatus according to the present invention. FIG.
2 is a schematic view of a tracking solar power generation apparatus according to another embodiment of the present invention.
3 is a view showing a configuration in which the tracking photovoltaic device of FIG. 1 is rotated from a first position to a second position;
4 is a view showing a configuration for adjusting the installation angle of the solar module in the tracking type solar power generator of FIG. 1;
5 is a view showing an embodiment in which the tracking type photovoltaic device of the present invention includes eight solar modules.
6 is a view showing a structure for connecting a solar module to an X-shaped auxiliary fixing table.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments of the present invention, a description of well-known structures that can be easily understood by those skilled in the art will be omitted so as not to obscure the gist of the present invention. In addition, when referring to the drawings, it should be considered that the thicknesses of the lines and the sizes of the constituent elements shown in the drawings may be exaggerated for clarity and convenience of explanation.

FIG. 1 is a view showing the overall structure of a tracking type photovoltaic device 10 according to the present invention, and will be described in detail with reference to FIG.

The tracking type photovoltaic apparatus 10 according to the present invention includes a first support 100, a rotation shaft 300 rotatably coupled to the first support 100, a rotatably mounted power cylinder 400, A solar module support rod 500 provided on the rotating shaft 300, a solar module 600, and a controller 700. The second support block 200 includes a second support block 200,

The first support 100 supports the rotating shaft 300 so that the rotating shaft 300 can freely rotate. A toggle bar 310 is fixedly mounted on the rotating shaft 300 so as to have a predetermined length in the radial direction.

The second support platform 200 is disposed adjacent to the first support platform 100 and the power cylinder 400 having the expansion and contraction rod 410 whose protrusion length is varied by external power is rotated Respectively. Hydraulic, pneumatic, electric cylinder or the like can be applied as the power cylinder 400, and the end of the extensible rod 410 is hinged to the free end of the toggle bar 310.

The first support 100 and the second support 200 are fixed to the ground or a foundation floor prepared in advance and are fixed to the first support 100 and the toggle bar 300 of the rotary shaft 300 mounted on the second support 200 The extension rod 410 of the power cylinder 400 and the extension rod 410 of the power cylinder 400 are hinge-connected at three points. When the length of the extension rod 410 is changed, the toggle bar 310 connected thereto is pushed or pulled The rotary shaft 300 rotates clockwise / counterclockwise. The movement of the rotary shaft 300 will be described in more detail with reference to FIG.

In the illustrated embodiment, the first support 100 and the second support 200 are configured as separate structures. The first and second supports 100 and 200 may be configured as a single structure Here, the first support 100 and the second support 200 should be understood as supporting structures in which the rotary shaft 300 and the power cylinder 400 are mounted, respectively.

2, instead of omitting the second support 200, one end of the power cylinder 400 is rotatably mounted on the first support 100 while the other end of the power cylinder 400 is mounted on the first support 100, It is also possible to implement the same operation of rotating the rotary shaft 300 clockwise / counterclockwise by hinging the extensible rod 410 to the free end of the toggle bar 310. That is, when the extensible rod 410 of the power cylinder 400 is extended on the drawing of FIG. 2, the rotary shaft 300 rotates in the counterclockwise direction and conversely, when the extensible rod 410 shrinks, it rotates clockwise.

A solar module support rod 500 for supporting the solar module 600 is fixedly mounted on the rotary shaft 300. The solar module support rod 500 is mounted on the rotary shaft 300 with a length Adjustable variable struts 510 and fixed length struts 520 having a constant length. The variable strut 510 makes a difference in height with respect to the fixed struts 520 so that the desired inclination of the solar module 600 installed in the solar module supporting rod 500, And the length thereof is adjusted so as to be formed.

The variable strut 510 of the photovoltaic module support bar 500 and the other end of the fixed strut 520 are hinged to the solar module 600 because the inclination of the variable strut 510 changes according to the length of the variable strut 510 This is because the connecting portion needs to be rotatable.

Here, the solar module 600 is mounted so as to be inclined obliquely with respect to the longitudinal direction of the rotary shaft 300, as in the embodiment of FIG. 5 to be described later, a plurality of solar modules 600 are arrayed along the rotary shaft 300 The installation area can be minimized. Accordingly, the tracking photovoltaic apparatus 10 of the present invention can minimize the installation area thereof, and can be efficiently installed in an area having a high land value.

In addition, if the solar module 600 is installed obliquely with respect to the longitudinal direction of the rotary shaft 300, shaded regions of shadows that may occur between the plurality of solar modules 600 can be reduced, It becomes effective. That is, when the solar altitude in the vicinity of sunrise and sunset is low, the plurality of solar modules 600 located on the left and right (reference in FIG. 1) of the rotary shaft 300 have the smallest overlapping area when viewed from the sun, The shaded area can also be kept at a minimum because all the solar modules 600 receive the sunlight almost at the front even when they are located at the center of the rotary shaft 300 at the highest noon.

Accordingly, the arrangement in which the photovoltaic module 600 is installed obliquely with respect to the longitudinal direction of the rotary shaft 300 is an efficient construction for both installation cost (in particular, land value) and power generation efficiency.

The tracking photovoltaic apparatus 10 of the present invention includes a controller 700. The controller 700 controls the driving of the power cylinder 400, that is, the movement of the extensible rod 410, The control unit 310 controls the rotation of the rotation shaft 300 from the first predetermined position P1 to the second predetermined position P2.

Here, the first position P1 of the rotary shaft 300 is a position where the solar module 600 looks at the sun in the present invention, and the second position P2 is the sun It is most preferable to adjust the position of the solar module 600 supported on the rotary shaft 300 over the entire daylight hours when the sun is floating.

In particular, when the photovoltaic module support rods 500 are arranged so that the surface of the photovoltaic module 600 is perpendicular to the above-described direction (meaning that the sunlight is incident vertically) when in the first and second positions P1 and P2, It is more preferable to arrange the position of the lens.

The movement of the rotary shaft 300 from the first position P1 to the second position P2 will be described with reference to FIG.

As shown in the drawing, when the retractable rod 410 of the power cylinder 400 is in the longest state with reference to the arrangement structure in which the second support 200 is positioned on the right side with respect to the first support 100 The solar module 600 fixed to the solar module support rod 500 on the rotary shaft 300 is in a position to look to the right (east) and thus looks at the sunrise (see, for example, When the position of the support is on the left side of the first support, the stretching movement of the stretching rod is reversed).

In response to this, the controller 700 controls the driving of the power cylinder 400 to shrink the extensible rod 410 to rotate the rotary shaft 410. In this case, 300 are rotated counterclockwise so that the solar module 600 can track the sun and maintain a vertical state in which maximum solar energy can be obtained.

When the retractable rod 410 continues to contract continuously, when the solar module 600 continues to track the sun, it finally reaches the second position P2 at which the sun at sunset is viewed, At night, the controller 700 controls the photovoltaic module 600 to return to the first position P1 again to wait for the next day to be released, which is also implemented in the embodiment of FIG.

As described above, the tracking photovoltaic apparatus 10 of the present invention includes the fixed first support 100 and the toggle bar 310 of the rotary shaft 300 mounted on the second support 200 and the power cylinder 400 ) Can be hinged at three points, so that it is possible to follow the change of the sun altitude according to the movement of the sun.

In addition, the present invention can further include a structure for more precisely and actively tracking the sun in response to a change in sunrise and sunset time depending on a change in the season. In particular, It is characterized in that it is configured to implement this tracking function without control algorithm.

That is, the present invention implements a more precise solar tracking function by including the GPS sensor 710, which is already popular, in the controller 700. The principle of the present invention is based on the latitude and longitude information and the time information received by the GPS sensor 710 The sunrise and sunset times are calculated and the rotation axis 300 is controlled to rotate from the first position P1 to the second position P2 during the period from the calculated sunrise time to the sunset time.

An algorithm, a program, and an application (app) for calculating the sunrise time and the sunset time from the geographical information such as the latitude and the longitude are well-known technologies. For example, Korean Patent No. 10-0678049 .01), "Mobile communication terminal sunrise and sunset time display method" also discloses such technology.

Therefore, it is very easy to calculate the sunrise and sunset times using the GPS sensor 710. When the sunrise and sunset times are calculated as described above, the sunrise and sunset times are calculated by comparing the sunrise and sunset times with the current time information received by the GPS sensor 710, It is possible to control the rotation axis 300 to move from the first position P1 to the second position P2 in accordance with the sunrise time and the sunset time of the rotary shaft 300. [

Further, since the circumferential rotation speed of the earth is almost constant and the circumferential movement of the sun also takes place at almost constant speed, it is possible to control the rotation axis 300 to rotate at a constant speed from the first position P1 to the second position P2, So that the tracking solar photovoltaic device 10 of the present invention has the advantage that it can implement the solar tracking function with great accuracy without directly tracking the position of the sun.

In the following description, the installation angle of the solar module 600 according to the altitude change according to the performance of the sun is set to < RTI ID = 0.0 > The configuration for manual adjustment will be described.

As described above, according to the present invention, the length of the variable strut 510 of the photovoltaic module support bar 500 is adjustable to make a height difference with respect to the fixed strut 520, To be perpendicular to the vertical axis. The height difference of the variable strut 510 with respect to the fixed strut 520 is determined according to the latitude at which the tracking photovoltaic power generation apparatus 10 is installed. For example, The height of the variable strut 510 must be greater when there is a variable strut 510 on the north side.

As described above, according to the present invention, the change of the length of the variable strut 510 is manually controlled. This is because the altitude change due to the sun's movement is very slow compared to the circumferential movement, Is low. In other words, it is not a technical problem to fully automate a variable strut 510 by applying a configuration (for example, a linear actuator) that automatically changes the length of the variable strut 510 while utilizing the GPS sensor 710, And therefore, these modifications are also within the scope of the technical idea of the present invention.

Here, the present invention makes it possible to include an arrangement for allowing an appropriate length change of the variable strut 510, that is, an installation angle of the photovoltaic module 600 to be intuitive and easy.

4, the variable strut 510 includes a variable strut table 512 fixed on the rotary shaft 300 and a variable strut 514 slidably mounted on the variable strut table 512, And the variable supporting bar 514 is fixed at a predetermined position by a fixing means such as a rotary knob. Here, the installation angle of the solar module 600 is perpendicular to the sun in the corresponding month The identifier 516 indicating the specific fixed position of the variable support bar 514 to form the variable support bar 514 is displayed on the variable support bar 512. [

Accordingly, if the user fixes the variable support bar 514 in accordance with the identifier 516 indicating the current month, the solar module 600 is fixed to have a vertical angle in accordance with the sun altitude at the corresponding month It can be adjusted intuitively and easily without the need for separate measurement tools or calculations.

Depending on the embodiment, the displayed month may indicate the installation angle at the first day of the month, allowing the user to adjust the interval at a predetermined interval, or the displayed month may be set at the installation angle Middle value), and so on.

It is natural that various identifiers can be applied to represent the position of the sun according to the solar power, such as displaying a more detailed 24 seasons instead of displaying the corresponding month, and therefore, the meaning of displaying the "month" It should be understood that it is wider than meaning.

FIG. 5 shows an embodiment in which a plurality of (eight) solar module supporting rods 500 and a plurality of solar modules 600 are provided. When a plurality of solar modules 600 are installed, The first support 100 rotatably supports the middle portion of the rotary shaft 300 and the auxiliary support 300 rotatably supports the rotary shaft 300 at both ends of the rotary shaft 300. [ (800).

In addition, while the solar module 600 includes two solar modules 610 arranged in series along the longitudinal direction thereof, each solar module 610 includes a variable strut 510 and a fixed strut 520, The solar module 600 is inclined relative to the longitudinal direction of the rotary shaft 300 so as to be coupled to the other end of the rotary shaft 300 so that the two solar modules 610 are supported by the pair of variable struts 510 and the fixed struts 520 .

Here, the reason why the two solar modules 610 are configured is that a small solar module is relatively inexpensive and easy to handle, so that one solar module having the same length is applied instead of the two solar modules 610 Of course it is possible.

The solar module 600 may further include an auxiliary fixture 620 that fixes the two solar modules 610 to each other to reinforce the support structure of the solar module 600.

6, the two ends of the variable strut 510 and the fixed strut 520 are connected to each other by X And may be coupled to any one of the plate-shaped auxiliary supports 620.

When the plurality of solar modules 600 are installed on one rotary shaft 300, the length of the rotary shaft 300 becomes long and the coaxiality of both ends of the rotary shaft 300 with respect to the middle portion supported by the first support 100 Excessive tolerances can lead to mechanical damage or noise. Construction of the coaxial system to maintain a constant level of installation leads to an increase in installation costs.

Therefore, the present invention allows at least one universal joint 320 on the rotary shaft 300 to allow slight variations in coaxiality. At this time, when the constant velocity joint is applied to the universal joint 320, the rotational speed of the entire rotary shaft 300 can be maintained to be the same.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be possible. Accordingly, the scope of the present invention will be determined by the appended claims and their equivalents.

10: Tracking Photovoltaic Device
100: first support frame 200: second support frame
300: rotating shaft 310: toggle bar
320: universal joint 400: power cylinder
410: stretching rod 500: photovoltaic module support bar
510: variable strut 512: variable strut
514: Variable support bar 516: Identifier
520: stationary support 600: solar module
610: Photovoltaic module 620: auxiliary fixture
700: Controller 710: GPS sensor
800: Secondary support
P1: first position P2: second position

Claims (13)

A first support for rotatably supporting an intermediate portion of the rotary shaft;
A shaft rotatably coupled to the first support, the rotation shaft having a toggle bar fixed thereto mounted in the radial direction;
A second support member to which a power cylinder having a telescopic rod hinged to the free end of the toggle bar is rotatably mounted;
An auxiliary support provided at both ends of the rotary shaft and rotatably supporting the rotary shaft;
A photovoltaic module support bar including a plurality of solar modules corresponding to the number of solar modules, a variable strut length whose one end is fixed on the rotary shaft, and a fixed strut having a fixed length;
A pair of solar modules each of which is hingedly coupled to the other end of the fixed strut and the other of the pair of solar control modules, the pair of solar modules being arranged to be inclined with respect to the longitudinal direction of the rotary shaft Solar modules;
Two pairs of solar modules are formed to intersect with each other in an X-shape so that the pair of solar modules are fixed to each other across the pair of solar modules, and the variable strut and the other end of the fixed strut A second retainer coupled to the second retainer; And
A controller for controlling the rotation of the rotation shaft from the first position to the second position by rotating the toggle bar by controlling the driving of the power cylinder;
Wherein the photovoltaic device is a photovoltaic device. A first support for rotatably supporting an intermediate portion of the rotary shaft;
A shaft rotatably coupled to the first support, the rotation shaft having a toggle bar fixed thereto mounted in the radial direction;
A power cylinder rotatably mounted on the first support with a telescopic rod hinged to a free end of the toggle bar;
An auxiliary support provided at both ends of the rotary shaft and rotatably supporting the rotary shaft;
A photovoltaic module support bar including a plurality of solar modules corresponding to the number of solar modules, a variable strut length whose one end is fixed on the rotary shaft, and a fixed strut having a fixed length;
A pair of solar modules each of which is hingedly coupled to the other end of the fixed strut and the other of the pair of solar control modules, the pair of solar modules being arranged to be inclined with respect to the longitudinal direction of the rotary shaft Solar modules;
Two pairs of solar modules are formed to intersect with each other in an X-shape so that the pair of solar modules are fixed to each other across the pair of solar modules, and the variable strut and the other end of the fixed strut A second retainer coupled to the second retainer; And
A controller for controlling the rotation of the rotation shaft from the first position to the second position by rotating the toggle bar by controlling the driving of the power cylinder;
Wherein the photovoltaic device is a photovoltaic device. 3. The method according to claim 1 or 2,
Wherein the first position of the rotation axis is a position at which the solar module looks at a sunrise and the second position is a position at which the solar module looks at the sun at sunset. Device. The method of claim 3,
Wherein the surface of said photovoltaic module at said first and second locations is perpendicular to said sun. The method of claim 3,
The controller includes a GPS sensor to calculate a sunrise and sunset time according to latitude, longitude information and time information received by the GPS sensor, and the rotation axis is moved to the first position To rotate to a second position. 6. The method of claim 5,
Wherein the controller controls the rotation axis to rotate at a constant speed from the first position to the second position. 3. The method according to claim 1 or 2,
Wherein the variable strut includes a variable strut table fixed on the rotating shaft and a variable strut mounted on the variable strut table so as to be slidable with respect to the variable strut table, Wherein an identifier indicating a fixed position of the variable support rods is formed so as to be perpendicular to a sun in the track. delete delete delete delete 4. The method according to any one of claims 1 to 3,
Wherein the rotary shaft is provided with at least one universal joint. 13. The method of claim 12,
Wherein the universal joint is a constant velocity joint.

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