Solar tracker having rotational friction reduction function for upward wind

Abstract

The present invention provides a solar tracker having a rotational friction reduction function for upward wind by including a first friction reduction member and a second friction reduction member, which reduce rotational friction when a load of a solar panel is applied, as well as reduce rotational friction in a situation in which wind blows upward.

Description

Solar tracker with rotational friction reduction function in upwind conditions

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0097560, filed July 23, 2024, and Korean Patent Application No. 10-2025-0085414, filed June 26, 2025, the entire disclosures of which are incorporated herein by reference.

[0002] The present invention relates to a solar tracker, and more particularly, to a solar tracker having a function of reducing rotational friction in an upward wind, which is installed on a pole supporting a solar panel and can perform solar tracking.

[0003] Typically, solar power generation systems are built in a complex form by grouping a number of solar panels on sites such as forests, fallow fields, building roofs, reservoirs, and salt pans.

[0004] When a solar power plant site is forested or farmland, clearing the site through logging or civil engineering work is required before installing the frame structure and solar panels. This inevitably leads to extensive damage to trees and soil, potentially damaging the environment. Due to these negative consequences, even if forested or farmland meets the site requirements for solar power generation, it's difficult to utilize them as solar power sites.

[0005] Korean Patent Publication No. 2011-0024887 discloses a self-weighting solar power generation device that can be installed non-destructively on a rooftop of a building or on an embankment. The self-weighting solar power generation device includes a column assembly formed by connecting at least one column in series, and a solar collector attached to the upper portion of the column assemblies, wherein the column has an inclined surface on its upper surface and a space for receiving a filler material therein.

[0006] Korean Patent Publication No. 2016-0086729 relates to a method for installing solar modules without occupying a field or paddies, and discloses a solar module and method for installing solar modules in a rice paddy equipped with a lower support, a fixed frame, and a support frame so that solar modules can be easily installed in a field or paddies during the fallow season after harvest.

[0007] However, conventional solar power generation systems still have the problem of serious damage to the natural environment during construction due to the large area occupied by the frame structure supporting the solar panels, so an alternative is required.

[0008] Furthermore, conventional solar power generation systems typically feature fixed-mounted solar panels, resulting in low solar power generation efficiency. Although systems that track the sun's movement and move solar panels for solar power generation are available, their complexity and high cost make system construction difficult.

[0009] To increase the efficiency of solar power generation, it is desirable to rotate the solar panels along a set path at a set speed considering the amount of sunlight.

[0010] However, if the solar panel is installed on the top of the pole and the rotational axis of the drive motor is simply connected to the solar panel and rotated, the rotational axis of the drive motor may be overloaded, and if an external force such as wind is applied, the connection between the rotational axis and the solar panel may become twisted or damaged, and the wiring at the rotating part may become disconnected, so countermeasures are required. These problems occur frequently when rotating the solar panel in an upward wind environment, where the wind blows upward from below the solar panel.

[0011] The present invention was created in consideration of the above problems, and provides a solar tracker having a function for reducing rotational friction in an upward wind, which can solve the problem of the rotational element being damaged, the connection between the rotational element and the solar panel being twisted, and the wiring being disconnected due to the wind applied upward from below the solar panel.

[0012] Another object of the present invention is to provide a solar tracker having a rotational friction reduction function in an upward wind, which is easy to manufacture and construct and reduces the cost of solar power generation facilities by simplifying the configuration and arrangement structure of rotating elements for rotating solar panels.

[0013] In order to achieve the above object, the present invention provides a solar tracker having a rotational friction reduction function in an upward wind, the solar tracker including: a fixed body having a pole fastening portion; a rotating body rotatably assembled on the upper portion of the fixed body and having a solar panel mounting portion provided on the upper portion; a catch portion provided between the fixed body and the rotating body to prevent the rotating body from being separated from the fixed body due to an upwardly applied wind; a first friction reduction member interposed between the fixed body and the rotating body and supporting a downward load applied by the solar panel while reducing rotational friction of the rotating body with respect to the fixed body; a second friction reduction member disposed between the catch portion and the rotating body and reducing rotational friction between the rotating body and the catch portion when the rotating body rotates while an upwardly applied wind force is applied; and a driving motor installed on one selected from the fixed body and the rotating body to provide a rotational force capable of slowly rotating the rotating body at a predetermined speed with respect to the fixed body.

[0014] The above-mentioned catch may include a circular rib that is provided integrally with the fixture at the end of the fixture and protrudes inwardly from the fixture.

[0015] The first friction reducing member may be arranged on the upper surface of the catch portion, and the second friction reducing member may be arranged on the lower surface of the catch portion.

[0016] The above first friction reducing member and the above second friction reducing member may each be a thrust bearing in which the engaging portion and the hollow center are aligned in a straight line.

[0017] The lower part of the above-mentioned rotating body penetrates the hollow of the first friction reducing member, the engaging member, and the second friction reducing member, and a ring gear is fixed to the lower part of the above-mentioned rotating body so as to be able to rotate integrally with the above-mentioned rotating body, and the ring gear can come into contact with the second friction reducing member.

[0018] The wire connected to the solar panel extends downward through the hollow of the first friction reducing member, the catch, and the second friction reducing member, and the driving motor can perform an operation of rotating the rotating body in a direction opposite to the solar tracking direction after sunset.

[0019] The above solar tracker can perform solar tracking by controlling the driving motor based on GPS and rotation count values.

[0020] It may further include a rotation counter connected to the ring gear and capable of integral rotation, and having light-transmitting portions and light-blocking portions alternately arranged at a set interval in the circumferential direction; and a light sensor portion arranged around the rotation counter.

[0021] The above-mentioned optical sensor unit includes a first optical sensor and a second optical sensor that are adjacently arranged corresponding to one pitch interval of the light-transmitting unit and the light-blocking unit, and the first optical sensor and the second optical sensor can simultaneously output the same on / off detection signal for at least one selected from among the counting start point and the counting end point of the rotation counter, and can alternately output the opposite on / off detection signals corresponding to the light-transmitting unit and the light-blocking unit in a rotation amount detection section between the counting start point and the counting end point.

[0022] The upper surface of the above-mentioned catch portion may have a circular groove formed with its center aligned in a straight line with the center of the catch portion, the first friction reducing member may be a steel ball disposed within the groove and performing a rolling motion when the rotating body rotates, and the second friction reducing member may be a thrust bearing with the catch portion and the hollow center aligned in a straight line.

[0023] The present invention further includes a slip ring provided at a joint portion between the rotating body and the fixed body to transmit power and / or an electric signal between the rotating body and the fixed body, wherein the slip ring is disposed within the hollow portion of the second friction reducing member and the engaging portion, and a portion of the slip ring can rotate together with the rotating body.

[0024] The solar tracker having a function of reducing rotational friction in an upward wind according to the present invention has the following effects.

[0025] First, by means of the first friction-reducing member and the second friction-reducing member arranged above and below the catch, rotational friction can be reduced when a load is applied to the solar panel, as well as rotational friction in a situation where the wind blows upward.

[0026] Second, by arranging the first friction-reducing member and the second friction-reducing member on the upper and lower surfaces of the catch, respectively, the joint structure can be simplified and production costs can be reduced.

[0027] Third, the rotational amount of the rotating body can be detected more precisely through the new structure of the rotation counter and optical sensor.

[0028] Fourth, since there are no bulky and complex components at the joint between the fixed body and the rotating body, the outer diameter of the solar tracker can be made smaller than before, thereby expanding the scope of application.

[0029] FIG. 1 is a cross-sectional view illustrating the configuration of a solar tracker having a function for reducing rotational friction in an upward wind according to a first embodiment of the present invention.

[0030] Figure 2 is a perspective view illustrating in detail the configuration of the rotation counter and light sensor unit in Figure 1.

[0031] Figure 3 is a partial enlarged view of “A” in Figure 1.

[0032] FIG. 4 is a cross-sectional view illustrating the configuration of a solar tracker having a function for reducing rotational friction in an upward wind according to a second embodiment of the present invention.

[0033] Fig. 5 is a cross-sectional view showing an example of a solar panel separated from Fig. 4.

[0034] Fig. 6 is a rear view illustrating an example of use of a solar tracker having a function for reducing rotational friction in an upward wind according to the present invention.

[0035] FIG. 1 is a cross-sectional view showing the configuration of a solar tracker having a function for reducing rotational friction in an upward wind according to a first embodiment of the present invention, FIG. 2 is a perspective view showing in detail the configuration of a rotation counter and a light sensor unit in FIG. 1, and FIG. 3 is a partial enlarged view of “A” in FIG. 1.

[0036] Referring to FIGS. 1 to 3, a solar tracker (10) having a function of reducing rotational friction in an upward wind according to a first embodiment of the present invention includes a fixed body (23) having a pole fastening portion that can be fixed to the upper end of a pole (1), a rotating body (11) that is rotatably assembled on the upper end of the fixed body (23) and has a solar panel mounting portion (24) having an inclined shape on the upper end, a driving motor (22) that is arranged inside the fixed body (23) and provides rotational force, a catch (30) that is arranged between the fixed body (11) and the rotating body (11) and that suppresses the rotating body (11) from being separated from the fixed body (23) by an upwardly applied wind (upward wind), and a first friction reducing member (12) and a second friction reducing member (13) that are arranged above and below the catch (30), respectively.

[0037] The pole (1) can be erected vertically on the ground of the solar power generation site. As shown in Fig. 6, the pole (1) can be formed of a metal tubular body with a round outer surface like a typical streetlight pole, and can be formed of various other materials and shapes. Even if the solar power generation site is located in a place where trees exist, such as a mountainous area, forest, or fallow field, when constructing the solar power generation system, multiple poles (1) can be placed at a set interval from each other to allow for trees to be located around them.

[0038] The fixture (23) may have a lower opening into which the upper end of the pole (1) can be fitted, as shown in Fig. 1, and a pole fastening portion including fastening members such as a bolt fastening hole. The fixture (23) may be fastened to the upper end of the pole (1) through the pole fastening portion. The fixture (23) may be a cylindrical tubular body having an outer diameter similar to or slightly larger than that of the pole (1).

[0039] The rotating body (11) is a cylindrical tubular body having an outer diameter approximately the same as that of the fixed body (23), and its upper end can be directly (or indirectly) connected to the back surface of the solar panel (P). A solar panel mounting portion (24) having an inclined shape corresponding to the inclination angle of the solar panel (P) can be assembled to the upper end of the rotating body (11). The back surface of the solar panel (P) can be connected to the solar panel mounting portion (24) by means of bolt fastening or the like, and can be arranged to be inclined at an inclined angle for solar power generation. The lower part of the rotating body (11) extends downward so as to penetrate the hollow portions of the first friction reducing member (12), the engaging member (30), and the second friction reducing member (13) which will be described later, and a ring gear (21c) can be fixed to the lower part.

[0040] The drive motor (22) can be fixed to one selected from the rotating body (11) and the fixed body (23), preferably inside the fixed body (23). The drive motor (22) provides a rotational force that can rotate one of the rotating body (11) and the fixed body (23) relative to the other. The rotation of the drive motor (22) can be controlled based on the output values ​​of the GPS module (25) and the rotation counter (26). In addition, the rotation control of the drive motor (22) may reflect the value of the light sensor, the rotation setting time for each season, etc.

[0041] The driving motor (22) is fixed inside the fixture (23), and when power is supplied, it rotates the rotor (11) with respect to the fixture (23). To supply power to the driving motor (22), electricity generated from the solar panel (P) and electricity from the KEPCO commercial power grid can be used in combination. That is, the operating power of the driving motor (22) can be provided by the solar panel (P) itself during the generation time. In addition, when the sun sets or the weather is cloudy, the operating power of the driving motor (22) can be provided through the KEPCO commercial power grid. In the case of using the KEPCO commercial power grid, there is an advantage in that the driving motor (22) can be operated for a longer period of time, that is, until late at night, to rotate the solar panel (P), compared to when power is provided only by the solar panel (P).

[0042] The gear unit (21) is arranged inside the fixed body (23) and is connected to the rotational shaft of the driving motor (22) to reduce the rotational force and transmit it to the rotating body (11). Specifically, the gear unit (21) may include a reduction gear (21a) that reduces the rotational force provided from the driving motor (22), a spur gear (21b) arranged at the output end of the reduction gear (21a), and a ring gear (21c) that is capable of rotating by meshing with the spur gear (21b) and is connected to the lower end of the rotating body (11) to be capable of rotating integrally with the rotating body (11).

[0043] A catch (30) is provided between the fixed body (11) and the rotating body (11) to prevent the rotating body (11) from being pulled out and separated from the fixed body (23) by an upwardly applied wind. The catch (30) is provided integrally with the fixed body (23) at the upper end of the fixed body (23) and may include a circular rib protruding inwardly of the fixed body (23). As shown in Fig. 1, the circular rib may be implemented by a structure in which a circular edge portion of the fixed body (23) is bent inward at a right angle.

[0044] The first friction reducing member (12) is interposed between the fixed body (23) and the rotating body (11) and supports a load applied downward by the solar panel (P) or an external force such as a downward wind, while reducing the rotational friction of the rotating body (11) with respect to the fixed body (23). The loads of the solar panel (P) and the rotating body (11) can be applied to the first friction reducing member (12) through a part of the rotating body (11). For this purpose, the upper surface of the first friction reducing member (12) can come into contact with a part of the rotating body (11). It is preferable that a thrust bearing be employed as the first friction reducing member (12), but it is not limited to this example and various rolling means having a rotational friction reducing function can be employed. The first friction reducing member (12) can be arranged so that the center of the hollow part and the engaging part (30) are aligned in a straight line, and its lower surface is in contact with the upper surface of the engaging part (30).

[0045] The second friction reducing member (13) is arranged between the engaging member (30) and the rotating body (11) and reduces the rotational friction between the rotating body (11) and the engaging member (30) when the rotating body (11) rotates while the wind force is applied upward. As with the first friction reducing member (12), it is preferable that a thrust bearing be employed as the second friction reducing member (13), but the present invention is not limited to this example and various other rolling means having a rotational friction reducing function may be employed. The second friction reducing member (13) may be arranged so that the engaging member (30) and the hollow center are aligned in a straight line and at the same time come into contact with the lower surface of the engaging member (30). As described above, a ring gear (21c) is fixed to the lower portion of the rotating body (11) so as to rotate integrally with the rotating body (11). At this time, the ring gear (21c) is in contact with the lower surface of the second friction reducing member (13) and can rotate together, and the force of the wind applied upwards makes the ring gear (21c) come into closer contact with the second friction reducing member (13), so that rotational friction can be reduced.

[0046] The rotation counter (26) and the light sensor unit (27) arranged around it are for detecting the rotation amount of the rotating body (11) and the solar panel (P) or performing rotation control. As shown in FIGS. 2 and 3, the rotation amount detection section has a structure in which light-transmitting portions (26a) and light-blocking portions (26b) are arranged alternately at set intervals in the circumferential direction. The rotation counter (26) may be provided with a bolt insertion hole (26c) so that the rotation counter (26) can be bolted to the lower end of the rotating body (11) together with the ring gear (21c) and rotated as a whole. Here, the light sensor unit (27) may have a light emitting portion and a light receiving portion arranged with the rotation counter (26) in between, but is not limited to this example and may be modified to a type in which light emission and light reception are performed on one side of the rotation counter (26).

[0047] The light sensor unit (27) may include a first light sensor (27a) and a second light sensor (27b) that are arranged adjacent to each other in correspondence to a pitch interval between a light transmitting unit (26a) and a light blocking unit (26b) provided in the rotation counter (26).

[0048] The first light sensor (27a) and the second light sensor (27b) can output the same on / off detection signal when outputting the detection signal for the count start point (S) and / or the count end point (F) of the rotation counter (26). As a specific example, in FIG. 2, since there is an empty space between the light emitting unit and the light receiving unit of both the first light sensor (27a) and the second light sensor (27b) at the count start point (S) of the rotation counter (26), they can output the same digital off signal "0" at the same time. In addition, when the rotation counter (26) rotates clockwise by one pitch and the count end point (F) finally reaches the light sensor unit (27), the light blocking unit (26b) is positioned between the corresponding light emitting unit and the light receiving unit of both the first light sensor (27a) and the second light sensor (27b), so they can output the same digital on signal "1" at the same time. This operation can be implemented by placing two or more light-transmitting portions (26a) that are connected to each other at the counting start point (S) and the counting end point (F) of the rotation counter (26), or two or more light-blocking portions (26b) that are connected to each other.

[0049] The light transmitting portion (26a) and the light blocking portion (26b) can output on / off detection signals that are opposite to each other in the rotation amount detection section between the counting start point (S) and the counting end point (F) of the rotation counter (26). In the rotation amount detection section, the first light sensor (27a) and the second light sensor (27b) can alternately output digital on / off signals that are opposite to each other simultaneously, for example, (1,0), (0,1), (1,0), (0,1)... as the rotation counter (26) rotates by one pitch. This operation can be implemented by a structure in which the light transmitting portion (26a) and the light blocking portion (26b) are alternately arranged one by one between the counting start point (S) and the counting end point (F) of the rotation counter (26).

[0050] According to the above configuration, the count start point (S) and the count end point (F) of the rotation counter (26) can be accurately detected using the first light sensor (27a) and the second light sensor (27b). Therefore, after sunrise, the driving motor (22) is controlled to slowly rotate the rotating body (11) and the solar panel (P) while performing solar tracking, and after sunset, the driving motor (22) is controlled to simultaneously rotate the rotating body (11) and the solar panel (P) in the opposite direction of the solar tracking direction, thereby preventing twisting of the wire (C) and positioning the solar panel (P) at the point where solar tracking starts the next day.

[0051] The count start point (S) and the count end point (F) of the rotation counter (26) can be set to correspond to the positions where solar tracking starts and ends, respectively, for the solar panel (P). In addition, an upper anti-twist bump (28) that can rotate together with the rotation body (28) may be provided on one inner side of the rotation body (28), and a lower anti-twist bump (29) on which the upper anti-twist bump (28) can be caught may be provided at at least two points of the fixed body (23) so as to mechanically limit the rotation body (28) from rotating beyond a predetermined angle. At this time, the lower anti-twist bumps (29) at the two points may be arranged to correspond to the count start point (S) and the count end point (F) of the rotation counter (26). In addition, the ring gear (21c) may also be configured to have gear teeth only in the section corresponding to the rotation amount detection section between the count start point (S) and the count end point (F) of the rotation counter (26), and no gear teeth in other sections.

[0052] When power is supplied to the driving motor (22), the rotating body (11) and the solar panel (P) can perform a solar tracking function by slowly rotating at a set speed with respect to the fixed body (23). At this time, the rotation counter (26), the ring gear (21c), and the rotating body (11) rotate as one unit with respect to the fixed body (23), and the wire (C) connected to the solar panel (P) can extend downward to pass through the hollow of the rotating body (11), the ring gear (21c), and the rotation counter (26) to transmit power and signals.

[0053] As described above, the solar tracker (10) having a function of reducing rotational friction in an upward wind according to the present invention has a remarkable effect of reducing rotational friction when a load is applied to the solar panel, as well as reducing rotational friction in an upward wind situation, by the first friction reducing member (12) and the second friction reducing member (13) arranged above and below the catch (30).

[0054] In addition, by arranging two thrust bearings as the first friction reducing member (12) and the second friction reducing member (13) above and below the engaging member (30) in a substantially in-line type, the joint structure can be simplified and production costs can be reduced.

[0055] FIG. 4 is a cross-sectional view illustrating a configuration of a solar tracker having a function for reducing rotational friction in an upward wind according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating an example in which a solar panel is separated in FIG. 4.

[0056] Referring to FIGS. 4 and 5, a solar tracker (10) having a function of reducing rotational friction in an upward wind according to a second embodiment of the present invention comprises: a fixed body (23) having a pole fastening part that can be fixed to the upper end of a pole (1); a rotating body (11) that is rotatably assembled on the upper end of the fixed body (23) and has a solar panel mounting part (24) of an inclined shape on the upper end; a driving motor (22) that is arranged inside the fixed body (23) and provides rotational force; a slip ring (17) that is arranged in a hollow space of a joint portion between the fixed body (23) and the rotating body (11); a catch (30) that is arranged between the fixed body (11) and the rotating body (11) and suppresses the rotating body (11) from being separated from the fixed body (23) by an upwardly applied wind; a first friction reducing member (14) and a second friction reducing member (18) that are arranged above and below the catch (30), respectively; and a second It includes a friction reduction member (18).

[0057] The fixed body (23), rotating body (11), driving motor (22), catch (30), rotation counter (26), etc. are substantially the same as those in the above-described embodiment, so a detailed description will be omitted.

[0058] The slip ring (17) is a rotary connector that is arranged at the center of the rotating body (11) and the stationary body (23) and transmits power and / or an electric signal, i.e., at least one selected from among the power and the electric signal, between the rotating body (11) and the stationary body (23). A rotation counter (26) for detecting the amount of rotation may be arranged around the lower portion of the slip ring (17). The slip ring (17) may be arranged to penetrate the hollow portion of the second friction reducing member (18) and may be fixed to the rotating body (11) together with a lower bracket (20) that is fastened to the lower portion of the rotating body (11). Therefore, a portion of the slip ring (17) may rotate together with the rotating body (11) when the rotating body (11) rotates.

[0059] The first friction reducing member (14) is interposed between the fixed body (23) and the rotating body (11) and supports a load applied downward by the solar panel (P) and the rotating body (11) or an external force such as a downward wind, while reducing the rotational friction of the rotating body (11) with respect to the fixed body (23). The first friction reducing member (14) may be a steel ball. The steel ball may be replaced with a predetermined cylindrical rotating roller. At this time, a circular groove (15, 16) is formed on the upper surface of the engaging portion (30) and the inner surface of the rotating body (11) opposite thereto, the center of which is aligned in a straight line with the center of the engaging portion (30), and the first friction reducing member (14) is arranged in the groove (15, 16) so as to perform a rolling motion when the rotating body (11) rotates.

[0060] The second friction reducing member (18) is arranged between the catch (30) and the rotating body (11) and reduces the rotational friction between the rotating body (11) and the catch (30) when the rotating body (11) rotates while the wind force is applied upward. In addition, the second friction reducing member (18) suppresses the twisting between the rotating body (11) and the fixed body (23) due to the wind applied upward from the bottom of the solar panel (P). The second friction reducing member (18) may be a thrust bearing in which the catch (30) and the hollow center are aligned in a straight line.

[0061] The lower bracket (20) may be arranged to be opposite to the catch (30) with the second friction reducing member (18) in between. This structure can obtain resistance to the load of the solar panel (P) as well as strong wind acting upward from the bottom of the solar panel (P). The lower bracket (20) may have a lower bracket horizontal portion (20a) that contacts the lower flat surface of the second friction reducing member (18), a first lower bracket vertical portion (20b) that extends upward from one side of the lower bracket horizontal portion (20b) and is connected to the rotating body (11), and a second lower bracket vertical portion (20c) that extends downward from the other side of the lower bracket horizontal portion (20a). In order to reduce the number of parts and minimize the rotational force transmission path, the ring gear (21c) may be formed by molding the inner surface of the second lower bracket vertical portion (20c) itself by metal sintering or the like.

[0062] When power is supplied to the driving motor (22), the rotating body (11) and the solar panel (P) can perform a solar tracking function by slowly rotating at a set speed with respect to the fixed body (23). At this time, the lower bracket (20), the rotation counter (26), the ring gear (21c), the slip ring (17), and the rotating body (11) can rotate as one unit with respect to the fixed body (23).

[0063] The first friction reducing member (14) is a steel ball placed in a circular groove (15, 16) provided on the upper surface of the engaging portion (30) and the inner surface of the rotating body (11) facing it, and can reduce rotational friction by performing a rolling motion while supporting the load when the rotating body (11) rotates.

[0064] In addition, the second friction reducing member (18) can have the function of reducing rotational friction when the rotating body (11) rotates while a force is applied by wind applied upward from the bottom of the solar panel (P).

[0065] When the present invention is applied to solar tracking, it is possible to support the load of solar panels and strong external forces such as upward wind while smoothly rotating the rotating body and solar panels relative to the fixed body. Therefore, it is possible to prevent a decrease in solar power generation or damage to solar power generation equipment due to strong winds.

Claims

1. In a solar tracker that is installed on the top of a pole and rotates a solar panel, A fixture having a pole fastening member; A rotating body that is rotatably assembled on the upper part of the above-mentioned fixed body and has a solar panel mounting portion provided on the upper part; A catch provided between the fixed body and the rotating body to prevent the rotating body from being separated from the fixed body by an upwardly applied wind; A first friction reducing member interposed between the fixed body and the rotating body and supporting a load applied downward by the solar panel while reducing rotational friction of the rotating body with respect to the fixed body; A second friction reducing member arranged between the above-mentioned catch and the above-mentioned rotating body and reducing rotational friction between the above-mentioned catch and the above-mentioned rotating body when the above-mentioned rotating body rotates while an upward wind force is applied; and A solar tracker having a function of reducing rotational friction during an upward wind, comprising a drive motor installed on one of the fixed body and the rotating body and providing a rotational force capable of slowly rotating the rotating body at a set speed with respect to the fixed body.

2. In paragraph 1, A solar tracker having a function of reducing rotational friction during an upward wind, characterized in that the above-mentioned catch is provided integrally with the fixture at the end of the fixture and includes a circular rib protruding inwardly of the fixture.

3. In paragraph 2, A solar tracker having a rotational friction reduction function in an upward wind, characterized in that the first friction reduction member is arranged on the upper surface of the catch portion and the second friction reduction member is arranged on the lower surface of the catch portion.

4. In paragraph 3, A solar tracker having a function of reducing rotational friction during an upward wind, characterized in that the first friction reducing member and the second friction reducing member are each thrust bearings in which the engaging portion and the hollow center are aligned in a straight line.

5. In paragraph 4, The lower part of the above-mentioned rotating body penetrates the hollow of the first friction reducing member, the catch, and the second friction reducing member, A solar tracker having a function of reducing rotational friction during upward wind, characterized in that a ring gear is fixed to the lower portion of the above-mentioned rotating body and can rotate integrally with the above-mentioned rotating body, and the ring gear is in contact with the second friction reducing member.

6. In paragraph 5, The wire connected to the solar panel extends downward through the hollow portion of the first friction reducing member, the catch, and the second friction reducing member, A solar tracker having a function of reducing rotational friction during an upward wind, characterized in that the above driving motor performs an operation of rotating the rotor in the opposite direction to the solar tracking direction after sunset.

7. In paragraph 1, A solar tracker having a function for reducing rotational friction during an upward wind, characterized in that it performs solar tracking by controlling the driving motor based on GPS and rotation count values.

8. In paragraph 7, A rotation counter connected to the above ring gear and capable of rotating as a whole, with light transmitting and light blocking sections arranged alternately at a set interval in the circumferential direction; and A solar tracker having a rotational friction reduction function during an upward wind, further comprising a light sensor unit arranged around the rotation counter.

9. In paragraph 8, The above-mentioned optical sensor unit includes a first optical sensor and a second optical sensor that are arranged adjacent to each other corresponding to one pitch interval of the light transmitting unit and the light blocking unit, The above first light sensor and the above second light sensor, Simultaneously outputting the same on / off detection signal for at least one selected from among the count start point and count end point of the above-mentioned rotation counter, A solar tracker having a function for reducing rotational friction during an upward wind, characterized in that in a rotation amount detection section between the count start point and the count end point, opposing on / off detection signals are alternately output in response to the light transmitting portion and the light blocking portion.

10. In paragraph 3, A circular groove is formed on the upper surface of the above-mentioned catch portion, the center of which is aligned in a straight line with the center of the above-mentioned catch portion. The above first friction reducing member is a steel ball that is placed in the groove and performs a rolling motion when the rotating body rotates. A solar tracker having a function of reducing rotational friction during upward wind, characterized in that the second friction reducing member is a thrust bearing in which the engaging portion and the hollow center are aligned in a straight line.

11. In paragraph 10, It further includes a slip ring provided at a joint portion between the above-mentioned rotating body and the above-mentioned fixed body to transmit power and / or electric signals between the above-mentioned rotating body and the above-mentioned fixed body; A solar tracker having a function of reducing rotational friction during upward wind, wherein the slip ring is positioned within the hollow of the second friction reducing member and the engaging portion and a portion thereof is rotatable together with the rotating body.

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