Solar rotation device with vibration-resistant structure

Abstract

The present invention discloses a solar rotation device having a vibration-resistant structure, which includes a first planetary gear set and a second planetary gear set arranged in the next stage of the first planetary gear set, and in which at least the outer peripheral surfaces of the second PL gear and second ring gear of the second planetary gear set have an inclined tooth profile formed thereon, thus forming a tapered structure.

Description

[Technical field]

[0001] This application claims priority to Korean Patent Application No. 10-2022-0006224, filed on January 14, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. The present invention relates to a solar rotation device having a vibration-resistant structure, and more particularly to a solar rotation device having a vibration-resistant structure that is attached to a pole and provides a rotational force to a solar panel. [Background technology]

[0002] Generally, a solar power generation system is constructed in the form of an complex in which a large number of solar panels are aggregated on a site such as forest land, fallow land, the roof of a building, a reservoir, or a salt field. When the site for solar power generation is forest or farmland, the site must be leveled by cutting trees and carrying out civil engineering work before the frame structure and solar panels can be installed, which inevitably results in environmental destruction due to the large-scale damage to trees and soil. Due to these side effects, it is difficult to use forests and other areas as sites for solar power generation, even if they meet the site conditions required for solar power generation. Patent Document 1 discloses a self-weight type solar power generation device that can be installed in a non-destructive manner on the rooftop of a building, on a bank, etc. The self-weight type solar power generation device includes a column assembly formed by continuously connecting at least one column, and a light collecting plate coupled to the upper part of the column assembly, and the column is provided with an inclined surface on the upper surface and a filler receiving space in which a filler is received. Patent Document 2 relates to a method for installing solar modules without occupying fields, and discloses a solar module and method for installing in a rice field, which includes a lower support base, an installation and fixing frame, and a support frame, so that the solar module can be easily installed in fields that are off-farmland after harvesting. Patent Document 2 also discloses a solar module in which multiple easy-to-install solar modules are stacked and connected to the installation and fixing frame of the easy-to-install solar module and one side of the protective frame of another easy-to-install solar module by hinge means, and which has a structure that allows them to be spread out and installed when in use. However, conventional solar power generation systems require a large amount of space for the frame structures that support the solar panels, and there is still a problem of serious natural damage occurring during construction, so alternative solutions are needed. In addition, conventional solar power generation systems have the disadvantage that the solar panels are usually fixedly installed, resulting in low solar power generation efficiency. Although a system that tracks the movement of the sun and moves the solar panels for solar power generation has been released, the equipment is complicated and expensive, making it difficult to build the system. In order to increase the efficiency of solar power generation, it is preferable to rotate the solar panel along a predetermined path taking into account the amount of sunlight. However, if the solar panel is placed at the top of a pole and the rotating shaft of the drive motor is simply connected to the solar panel to rotate it, the rotating shaft of the drive motor may be overloaded, and when an external force such as wind is applied, the connection between the rotating shaft and the solar panel may become misaligned or broken, causing a problem of wiring being disconnected at the rotating part, and a solution to this problem is required. In addition, when external forces such as wind are applied to the solar panel, backlash in the gear assembly installed between the drive motor and the solar panel can cause the solar panel to vibrate. In severe cases, the gear assembly can be damaged and the solar panel can fall over. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Korean Patent Publication No. 2011-0024887 [Patent Document 2] Korean Patent Publication No. 2016-0086729 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been devised in consideration of the above problems, and aims to provide a solar rotation device having a vibration-resistant structure that can prevent the occurrence of unnecessary backlash in the gear assembly provided in the rotation device. Another object of the present invention is to provide a solar rotating device having a vibration-resistant structure that can solve the problem of wiring being broken in the rotating part due to the connection parts between the rotating device and the solar panel being shifted or damaged by external forces such as wind. [Means for solving the problem]

[0005] In order to achieve the above object, one aspect of the present invention includes a first tubular body connected to a solar panel array, a second tubular body coupled to a lower portion of the first tubular body and fixed to an upper end of a pole, a gear unit including at least two planetary gear sets and transmitting a reduced rotational force to the first tubular body, and a drive motor fixed inside the second tubular body and providing a rotational force to the gear unit, the gear unit including a first sun gear receiving the rotational force generated by the drive motor, a plurality of first PL gears arranged at predetermined intervals around the first sun gear and meshed therewith, and a first ring gear meshed with the outer sides of the plurality of first PL gears. a first planetary gear set having a first PL gear, a second planetary gear set arranged next to the first planetary gear set to receive rotational force, and having a second sun gear, a plurality of second PL gears arranged at predetermined intervals around the second sun gear and meshed therewith, and a second ring gear meshed with the outside of the plurality of second PL gears and outputting a reduced rotational force to the first tubular body, wherein at least the peripheral surfaces of the second PL gear and the second ring gear have inclined teeth formed thereon to have a tapered structure. It is preferable that the inclined tooth profile is formed on all of the outer peripheral surface of the second sun gear, the outer peripheral surface of the second PL gear, and the inner peripheral surface of the second ring gear, so that a predetermined clearance is secured at the gear contact surface during rotation, and that at the end of rotation, the tapered structure allows the gears to tightly mesh with each other, preventing the occurrence of backlash. When the rotation is completed, a force may be applied to the second PL gears due to their own weight in a direction in which they are inserted into the second sun gear and the second ring gear. The first ring gear and the second ring gear may each comprise an assembly of an upper ring gear and a lower ring gear. By connecting the first ring gear to the second sun gear, or by connecting the first ring gear to a portion of the carrier of the second PL gear, rotational force can be transmitted from the first planetary gear set to the second planetary gear set. Another aspect of the present invention provides a multi-stage compound gear assembly for a solar rotation device, comprising: a first sun gear that receives a rotational force generated by a drive motor; a plurality of first PL gears arranged at predetermined intervals around the first sun gear and meshed therewith; and a first ring gear meshed with the outside of the plurality of first PL gears; and a second planetary gear set that is arranged next to the first planetary gear set to receive the rotational force, and comprises a second sun gear, a plurality of second PL gears arranged at predetermined intervals around the second sun gear and meshed therewith, and a second ring gear that meshes with the outside of the plurality of second PL gears and outputs a reduced rotational force, wherein at least the peripheral surfaces of the second PL gear and the second ring gear have inclined teeth formed thereon to have a tapered structure. Effect of the Invention

[0006] The solar rotation device having a vibration-resistant structure according to one aspect of the present invention provides the following effects. First, the multi-stage compound gear assembly ensures a sufficient reduction ratio and can generate the appropriate clearance (backlash) required for rotation at the contact surfaces between the gears. When rotation is completed, the second PL gear, second sun gear and second ring gear come into tight contact with each other due to their tapered structure, preventing the occurrence of backlash, thereby preventing vibration and shaking of the solar panel due to wind, etc. By providing a second bearing and an assembly of the first tubular body and the second tubular body, the solar panel array attached to the pole can be firmly supported and the rotational force can be transmitted stably without shaking due to various vibrations, wind, or other external forces. Third, even if the diameters of the first tubular body and the second tubular body are designed to be the same or similar to the diameter of the pole, smooth rotation is achieved by the bearings interposed between the first tubular body and the second tubular body, making it possible to precisely control the rotation in seconds. Fourth, since the rotating device can be miniaturized and the configuration is simple, the investment can be recovered quickly and the problems of frequent breakdowns and high costs, which are disadvantages of conventional solar tracking devices, can be eliminated. Fifth, since the solar panels are supported by poles, they are sufficiently separated from the ground and allow for smooth ventilation, which can prevent the temperature of the solar panels from rising and improve the efficiency of solar power generation. Sixth, if the solar power generation site is in a mountainous area or forest, the trees around the poles supporting the solar panels can be left as they are, minimizing natural damage. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a rear perspective view showing the exterior of a solar rotation device having a vibration-resistant structure according to a preferred embodiment of the present invention. [Diagram 2] FIG. 2 is a partially enlarged view of the rotating device shown in FIG. [Diagram 3] 3 is an exploded perspective view showing an internal configuration of the rotating device shown in FIG. 2. [Figure 4] 4 is a perspective view showing a part of the gear unit and the drive motor shown in FIG. 3 in a cutaway view. FIG. [Diagram 5] 5 is a partial cross-sectional view showing the configuration of a gear portion shown in FIG. 4. [Figure 6] FIG. 6 is a cross-sectional view showing a modified embodiment of FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view showing a modified embodiment of FIG. 5. [Figure 8] FIG. 6 is a cross-sectional view showing a modified embodiment of FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] FIG. 1 is a rear perspective view showing the appearance of a solar rotation device having a vibration-resistant structure according to a preferred embodiment of the present invention, FIG. 2 is a partially enlarged view of the rotation device shown in FIG. 1, FIG. 3 is an exploded perspective view showing the internal configuration of the rotation device shown in FIG. 2, and FIG. 4 is a perspective view showing a cut-away portion of the gear section and drive motor configuration shown in FIG. 3.

[0009] 1 to 4. A solar rotating device 100 having a vibration-resistant structure according to a preferred embodiment of the present invention includes a first tubular body 101 connected to the back surface of a solar panel array 15, a second tubular body 106 assembled to the lower part of the first tubular body 101 and having a lower end fixed to a pole 10, a drive motor 107 attached to the inside of the second tubular body 106 to provide a rotational force to the first tubular body 101, and a gear unit 109 to transmit the rotational force provided by the drive motor 107 to the first tubular body 101. Preferably, the solar rotating device 100 includes contact units 102, 103, and 104 having at least three contact points attached to the joining portion between the first tubular body 101 and the second tubular body 106. The solar panel array 15 is configured by connecting a plurality of solar panels 15a in series with each other. The solar panel array 15 is attached to an inclined surface formed on the upper end of the first tubular body 101, and is installed so as to be inclined with respect to the ground. The installation angle of the solar panel array 15 is determined according to the angle of the inclined surface. The pole 10 is installed vertically to the ground and the lower end is fixed to the ground by fastening means such as an anchor bolt, etc. Preferably, the pole 10 is a metal tubular body with a round outer periphery like a typical street light pole, but may be made of various other materials and shapes. The first tubular body 101 is a pipe-shaped structure having a circular peripheral surface and a waterproof cover 105 provided on an inclined upper surface. The waterproof cover 105 is removably fastened so that the internal space of the first tubular body 101 can be opened and closed. The second tubular body 106 is assembled so as to be located below the first tubular body 101, and is a pipe-shaped structure having a circular peripheral surface. A space is provided at the lower end of the second tubular body 106 into which the upper end portion of the pole 10 can be fitted. By fitting the pole 10 in, the second tubular body 106 is fixed to the upper end of the pole. In order to enhance the connection between the rotating device 100 and the pole 10 and form a structurally stable assembly, the diameters of the first tubular body 101 and the second tubular body 106 can be designed to be the same as or similar to the diameter of the pole. Between the first tubular body 101 and the second tubular body 106, a gear portion 109 including a predetermined bearing (see reference numeral 116 in FIG. 5) is interposed. The gear unit 109 for reducing the rotational force provided by the drive motor 107 at a sufficient ratio and transmitting it to the first tubular body 101 is composed of a multi-stage compound gear assembly including at least two planetary gear sets. Hereinafter, the configuration of the invention will be described focusing on an embodiment in which the gear unit 109 is composed of an assembly of two-stage planetary gear sets. The gear unit 109 includes a first planetary gear set that receives the rotational force provided from the rotary shaft of the drive motor 107, and a second planetary gear set assembled in the next stage to the first planetary gear set. Here, when the gear unit 109 includes a planetary gear set of three or more stages, a planetary gear set is added and disposed in front of the first planetary gear set.

[0010] 4 and 5, the first planetary gear set includes a first sun gear 110 that is substantially connected to a rotating shaft of the driving motor 107 to receive a rotational force, a plurality of first PL gears 111 that are arranged at predetermined intervals around the first sun gear 110 and meshed therewith, a first ring gear 112 that is arranged outside the plurality of first PL gears 111 and meshed therewith, and a motor cover 117 that encloses the first ring gear 112. Here, when the gear unit 109 includes a planetary gear set having, for example, three or more stages, a ring gear (not shown) provided in another planetary gear set located in front of the first planetary gear set may be connected to the first sun gear 110 to transmit a rotational force. The second planetary gear set includes a second sun gear 113 connected to the first ring gear 112 to receive the rotational force, a plurality of second PL gears 114 arranged at predetermined intervals around the second sun gear 113 and meshed therewith, a second ring gear 115 meshed with the outer sides of the second PL gears 114 and fixed to the first tubular body 101, and a cross roller bearing 116 interposed in the second ring gear 115. A part of the lower end of the second sun gear 113 is fitted and fixed to the first ring gear 112, and rotates together with the first ring gear 115 to receive the rotational force. Alternatively, a part (e.g., a carrier pin) of a carrier 118 supporting the plurality of second PL gears 114 may be connected to the first ring gear 112 to receive the rotational force. In this case, a variant in which the second sun gear 113 is omitted is also possible. Both the first ring gear 112 and the second ring gear 115 may be comprised of an assembly of an upper ring gear 112a, 115a and a lower ring gear 112b, 115b. Since the second planetary gear set is a part that outputs the reduced rotational force to the first tubular body 101, at least the second PL gear 114 and the second ring gear 115 have a tapered structure (see the ellipse in FIG. 5) with inclined teeth formed on the peripheral surfaces. Most preferably, as shown in FIG. 4 and FIG. 5, the outer peripheral surface of the second sun gear 113, the outer peripheral surface of the second PL gear 114, and the inner peripheral surface of the second ring gear 115 all have inclined teeth formed at a predetermined pitch along the outer periphery to form a tapered structure. In this case, the second sun gear 113 is composed of a tapered first part and a second part that is not tapered and is fitted and fixed to the first ring gear 115. According to the configuration in which the tapered structure is formed, when the planetary gear set rotates, a predetermined clearance required for smooth rotation is ensured on the gear contact surfaces of the second sun gear 113, the second PL gear 114, and the second ring gear 115, and when the rotation is completed, the gears (the second sun gear 113, the second PL gear 114, and the second ring gear 115) return to their original positions by their own weight, and the tapered structure allows them to closely mesh with each other, so that the occurrence of unnecessary backlash can be efficiently suppressed. A spring that imparts elasticity to one side of the gear portion 109 may be added so that the gears (the second sun gear 113, the second PL gear 114, and the second ring gear 115) can be returned more quickly when the rotation is completed. The tapered structure as described above is formed at least at the contact portion between the second PL gear 114 and the second ring gear 115, which has the effect of preventing the rotating device 100 from swinging due to external forces such as wind. If the second sun gear 113 is also formed with a tapered structure, the second PL gear 114 is stably supported by the second sun gear 113 located at its center, which makes it possible to more effectively prevent the rotating device from swinging due to external forces. When a predetermined backlash of several millimeters is required on the contact surface between the gears (second sun gear 113, second PL gear 114, second ring gear 115) during rotation of the second planetary gear set, the second PL gears 114 move upward slightly while overcoming their own weight by the rotational force, so that the backlash necessary for smooth rotation can be secured. Meanwhile, when the rotation of the second planetary gear set ends, the second PL gears 114 return downward to their original positions by their own weight, and are tightly meshed with the second sun gear 113 and the second ring gear 115 by the tapered structure, so that the rotating device 100 is prevented from shaking due to external forces such as wind, and thus the solar panel array 15 can be prevented from shaking.

[0011] According to a modified embodiment of the present invention, the gears having the tapered structure among the second sun gear 113, the second PL gear 114, and the second ring gear 115 may be variously combined. Specifically, as shown in Fig. 6, the inclined teeth forming the tapered structure may be formed only on the outer peripheral surface of the second PL gear 114 and the inner peripheral surface of the second ring gear 115, and the outer peripheral surface of the second sun gear 113 may be configured to have a non-tapered tooth profile. In this case, the upper second ring gear 115a and the lower second ring gear 115b constituting the second ring gear 115 have different inner diameters corresponding to the inclined surface of the second PL gear 114. As another variation, the inclined teeth forming the tapered structure may be formed only on the inner peripheral surface of the second ring gear 115 as shown in FIG. 7, and the second sun gear 113 and the second PL gear 114 may be configured to have non-tapered teeth. As yet another variation, the inclined teeth forming the tapered structure may be formed only on the outer peripheral surface of the second PL gear 115 as shown in FIG. 8, and the second sun gear 113 and the second ring gear 115 may be configured to have non-tapered teeth. The drive motor 107 is fixedly installed upright inside the second tubular body 106 , preferably coaxially with the second tubular body 106 , and provides a rotational force to the gear portion 109 .

[0012] Further referring to Fig. 3, a first contact 102, a second contact 103, and a third contact 104 for transmitting power and / or signals are provided at or around the coupling portion or contact portion between the first tubular body 101 and the second tubular body 106. Although not shown, according to a variant of the present invention, a rotating device having more than three contacts may be provided. The first contact 102 and the second contact 103 are each composed of a contact pair of conductor rings 102a, 103a fixed to be substantially connected to the second tubular body 106, and conductor blocks 102b, 103b that slide against the upper surfaces of the conductor rings 102a, 103a and continuously maintain contact during relative rotation between the first tubular body 101 and the second tubular body 106. The conductor ring 102a of the first contact 102 and the conductor ring 103a of the second contact 103 are arranged concentrically with each other. One of the first contact 102 and the second contact 103 is a negative terminal, and the other is a positive terminal. Both ends of the entire output section of the multiple solar panels 15a are connected to the first contact 102 and the second contact 103, respectively. The power output through the first contact 102 and the second contact 103 is supplied to a power generation inverter 108 and used for power generation. The third contact 104 is composed of a contact pair consisting of a conductor ring 104a fixed to a rotating portion of the gear unit 109 on the upper side of the first contact 102 and the second contact 103 and rotating integrally with the first tubular body 101, and a conductor block 104b that slides and maintains contact with the lower surface of the conductor ring 104a during relative rotation between the first tubular body 101 and the second tubular body 106. The third contact 104 is electrically connected to a positive terminal drawn from a part of output sections (e.g., an output end of one solar panel 15a) of the multiple solar panels 15a constituting the solar panel array 15. The power output through the third contact 104 is used as a power source for driving the driving motor 107 and a predetermined PCB (Printed Circuit Board). The third contact 104 is preferably disposed relatively radially inward from the rotation axis of the rotating device, ie, closer to the drive motor 107, than the second contact 103, to supply power to the drive motor 107 and the PCB. The first contact 102 is preferably used as a negative common terminal for the second contact 103 and the third contact 104. The electrical polarities given to the first contact 102, the second contact 103 and the third contact 104 are not limited to the above-mentioned embodiment, and may of course be modified in various ways. The solar rotating device 100 having the above-mentioned configuration provides the rotational force of the drive motor 107 to the gear unit 109 to rotate the first tubular body 101, gradually rotating the solar panel array 15 fixed to the upper end of the first tubular body 101. The first tubular body 101 rotates relative to the second tubular body 106 fixed to the pole 10 while stably supporting the solar panel 15a. Since a bearing is interposed between the first tubular body 101 and the second tubular body 106, the structure is stable and can rotate smoothly. It is preferable that the rotation path of the solar panel 15a is set so that it is exposed to the sun as much as possible, taking into account the amount of sunlight. By rotating the solar panel 15a at a constant speed for a set time, the amount of solar power generation can be increased compared to the case where the solar panel 15a is placed in a stationary state so as to face one direction, without using a separate solar tracking device with a complex structure. Furthermore, in addition to the solar panel array 15, the present invention may also be equipped with a lift-up lighting unit and a lift-up CCTV (Closed Circuit Television) camera unit. In this case, the lighting unit and the CCTV camera unit are lifted by winding up the first and second lift-up cords due to the forward rotation drive of the drums built into the main body of each unit, and when they are coupled to the respective main bodies located at the top of the pole 10, the upper and lower contact parts built into the respective main bodies come into contact with each other, so that power can be supplied to the lighting unit and the CCTV camera unit. Here, power for driving the lighting unit and the CCTV camera unit may be provided, for example, through the first contact.

[0013] In the solar rotation device 100 according to the present invention, the rotational force of the drive motor 107 during operation rotates the first tubular body 101 through the gear unit 109, so that the solar panel array gradually rotates. The first tubular body 101 rotates relative to the second tubular body 106 fixed to the pole while stably supporting the solar panel array. The gear unit 109 is composed of a planetary gear set including a first planetary gear set and a second planetary gear set, and reduces the rotational force of the drive motor 107 and outputs it to the first tubular body 101. The first tubular body 101 rotates integrally with the solar panel array 15 fixed to the upper surface thereof. The rotational force of the drive motor 107 is transmitted to the first planetary gear set and the second planetary gear set in a chain manner. When the second planetary gear set rotates, a predetermined clearance required for smooth rotation is ensured on the gear contact surfaces of the second sun gear 113, the second PL gear 114, and the second ring gear 115, and when the rotation ends, the gears return to their original positions by their own weights, and the tapered structure allows them to closely mesh with each other, preventing the occurrence of unnecessary backlash. Here, it is most preferable that the tapered structure is formed on all of the second sun gear 113, the second PL gear 114, and the second ring gear 115, but even if the tapered structure is formed on only the second PL gear 114 and the second ring gear 115, the effect of reducing the occurrence of unnecessary backlash can be obtained. The assembly in which the assembly of the first tubular body 101 and the second tubular body 106 is coupled to the solar panel 15a can transmit a rotational force more stably than the conventional technology in which the rotational shaft of the drive motor is simply connected to the solar panel and rotated, since the diameters of the first tubular body 101 and the second tubular body 106 are larger than the diameter of the rotational shaft of the drive motor 107. In other words, even if external forces such as vibrations generated by the drive motor or wind are applied, the rotational force of the drive motor can be transmitted to the solar panel 15a without error.

[0014] As described above, the present invention has been described using limited embodiments and drawings. However, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the scope of the technical spirit of the present invention and the equivalent scope of the claims. [Industrial Applicability]

[0015] When the present invention is applied, solar power generation can be performed with high efficiency by stably rotating the solar panel attached to the upper end of the pole.

Claims

1. A solar rotation device having a vibration-resistant structure that is attached to the upper end of a pole and rotates a solar panel array, a first tubular body coupled to the solar panel array; a second tubular body coupled to a lower portion of the first tubular body and fixed to an upper end of a pole; a gear section including at least two planetary gear sets for transmitting a reduced rotational force to the first tubular body; a drive motor fixed inside the second tubular body to provide a rotational force to the gear portion; The gear portion is a first planetary gear set including a first sun gear receiving a rotational force generated by the drive motor, a plurality of first PL gears arranged at predetermined intervals around the periphery of the first sun gear and meshing with the first sun gear, and a first ring gear meshing with the outer sides of the plurality of first PL gears; a second planetary gear set disposed next to the first planetary gear set to receive a rotational force, the second planetary gear set including a second sun gear, a plurality of second PL gears disposed at predetermined intervals around the periphery of the second sun gear and meshed therewith, and a second ring gear meshed with the outer sides of the plurality of second PL gears to output a reduced rotational force to the first tubular body, At least the second PL gear and the second ring gear have a tapered structure formed on their peripheral surfaces with inclined teeth. A solar rotation device with vibration-resistant structure.

2. The solar rotating device having a vibration-resistant structure according to claim 1, wherein the inclined tooth profile is formed on all of the outer peripheral surface of the second sun gear, the outer peripheral surface of the second PL gear, and the inner peripheral surface of the second ring gear, thereby ensuring a predetermined clearance at the gear contact surface during rotational operation, and at the end of rotation, the tapered structure tightly meshes with each other to prevent the occurrence of backlash.

3. 3. The solar rotation device having a vibration-resistant structure as described in claim 2, wherein when rotation is completed, a force is applied to the multiple second PL gears due to their own weight in a direction in which they are inserted into the second sun gear and the second ring gear.

4. 2. The solar rotation device having a vibration-resistant structure according to claim 1, wherein the first ring gear and the second ring gear each comprise an assembly of an upper ring gear and a lower ring gear.

5. 2. A solar rotating device having a vibration-resistant structure as described in claim 1, wherein the first ring gear and the second sun gear are connected to each other, or the first ring gear and a part of the carrier of the second PL gear are connected to each other, thereby transmitting rotational force from the first planetary gear set to the second planetary gear set.

6. 1. A multi-stage compound gear assembly for a solar rotation device for rotating a solar panel array, comprising: a first planetary gear set including a first sun gear receiving a rotational force generated by a drive motor, a plurality of first PL gears arranged at predetermined intervals around the periphery of the first sun gear and meshing with the first PL gears, and a first ring gear meshing with the outer sides of the plurality of first PL gears; a second planetary gear set disposed next to the first planetary gear set to receive a rotational force, the second planetary gear set including a second sun gear, a plurality of second PL gears disposed at predetermined intervals around the periphery of the second sun gear and meshed therewith, and a second ring gear meshed with the outer sides of the second PL gears to output a reduced rotational force, At least the second PL gear and the second ring gear have a tapered structure formed on their peripheral surfaces with inclined teeth. Multi-stage compound gear assembly for solar rotation device.

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