Photovoltaic tracking system and speed reducer thereof
By employing gear sets and self-locking mechanisms in the photovoltaic tracking system, the problems of complexity and high cost of worm gear transmission are solved, enabling efficient angle adjustment and locking of photovoltaic modules, and reducing the difficulty and cost of equipment manufacturing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-04-10
AI Technical Summary
In existing photovoltaic tracking systems, worm gear transmission devices are complex to manufacture, require high precision, and are costly, making equipment manufacturing difficult.
The system employs a gear set and a self-locking mechanism. The gear set includes a first gear and a second gear with different diameters. The self-locking mechanism, through the cooperation of a locking disc, a drive shaft, a housing, and a locking component, enables the angle adjustment and locking of the photovoltaic module, preventing external forces from affecting it.
This technology enables efficient angle adjustment and locking of photovoltaic modules, reducing equipment precision requirements and costs while improving system stability and efficiency.
Smart Images
Figure CN224111112U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of photovoltaic tracking systems, in particular to a photovoltaic module tracking system and a speed reducer thereof. BACKGROUND
[0002] A photovoltaic tracking system is a device that can automatically adjust the angle of a photovoltaic module as the position of the sun changes. Its basic principle is to sense the position information of the sun, such as the altitude angle and azimuth angle of the sun, through a sensor, and then transmit this information to a controller. The controller drives the actuator according to the received signal, thereby adjusting the angle of the photovoltaic module so that it always remains perpendicular or nearly perpendicular to the sunlight. In this way, the maximum amount of solar radiation can be received, and the power generation of the photovoltaic system can be improved. The actuator includes a motor and a transmission device. The motor is the power source that drives the photovoltaic module to rotate according to the instructions of the controller. The transmission device transmits the rotational motion of the motor to the photovoltaic module to achieve angle adjustment.
[0003] In related technologies, the transmission device includes a worm gear transmission mechanism. Worm gear transmission can achieve a large reduction ratio and has a self-locking function.
[0004] However, the machining angle of the worm gear is complex, the precision of the equipment is high, and the cost is high. CONTENT OF THE INVENTION
[0005] Therefore, it is necessary to provide a speed reducer to solve the problems of high precision requirement and high cost of equipment when worm gears are used for transmission.
[0006] A speed reducer, comprising:
[0007] a gear set, including at least a first gear and a second gear connected in transmission, the diameter of the first gear being larger than that of the second gear, the first gear being used to connect with a photovoltaic module; and
[0008] a self-locking mechanism, including a driving shaft, a housing, and a locking disc, the locking disc being connected with the second gear, the driving shaft being used to connect with a motor, the driving shaft being able to drive the locking disc to rotate; a containing groove being formed on the locking disc, the containing groove containing a locking piece and at least a part of an elastic piece, the housing being sleeved outside the locking disc, the locking disc and the housing defining a locking groove; the elastic piece being used to make the locking piece pop into the locking groove from the containing groove along the circumferential direction of the locking disc, and in the locking groove, the locking piece abuts against the housing on the outer side of the locking disc in the radial direction, and the locking piece abuts against the locking disc on the inner side of the locking disc in the radial direction.
[0009] In one of the embodiments, one end of the driving shaft is provided with a pawl, the locking disc comprises an inner disc and at least two protrusions arranged at intervals outside the inner disc, the pawl extends into the space between two adjacent protrusions, and at least part of the pawl is in abutment with the protrusions along the circumference of the locking disc.
[0010] In one of the embodiments, the accommodating slot is formed on the protrusion, and the slot opening of the accommodating slot is located on the side of the protrusion away from the inner disc, and the locking slot is located between the protrusion and the pawl, and the accommodating slot and the locking slot are communicated through the slot opening.
[0011] In one of the embodiments, the gap between two adjacent protrusions gradually decreases along the inward radial direction of the locking disc, and the pawl has a first end close to the inner disc, and the two sides of the first end along the circumference of the locking disc are in abutment with the corresponding protrusions, respectively.
[0012] In one of the embodiments, two accommodating slots are sequentially formed on each protrusion along the circumference of the locking disc, and the locking member is arranged in each accommodating slot, respectively.
[0013] In one of the embodiments, two adjacent accommodating slots are connected through a through hole, the elastic member is arranged in the through hole, and the locking member is arranged in each accommodating slot, respectively, and the two ends of the elastic member are in abutment with the corresponding locking members, respectively.
[0014] In one of the embodiments, the width of the pawl along the circumference of the locking disc gradually increases along the outward radial direction of the locking disc.
[0015] In one of the embodiments, the size of the locking slot along the radial direction of the locking disc gradually decreases along the circumference of the locking disc.
[0016] A photovoltaic tracking system comprises a motor, a horizontal support and a speed reducer, the motor is installed at the bottom of the support, the axial direction of the motor is along the length direction of the horizontal support, the output shaft of the motor is connected with the driving shaft, the first gear is connected with the bottom of the photovoltaic module, and the motor is used to drive the photovoltaic module to rotate through the speed reducer.
[0017] The photovoltaic module tracking system and the speed reducer thereof, the locking disc rotates synchronously with the second gear, the driving shaft rotates synchronously with the motor, the driving shaft can drive the locking disc to rotate, that is, when the motor drives the driving shaft to rotate, the driving shaft can drive the locking disc to rotate, the locking disc drives the second gear to rotate, the second gear transmits the power to the first gear, and then the first gear drives the photovoltaic module to rotate, so as to adjust the angle of the photovoltaic module and facilitate the maximum reception of solar radiation. When the motor drives the photovoltaic module to adjust to the preset angle, the motor stops rotating, at this time, the angle of the photovoltaic module is easy to change (for example, it is blown by the wind) under the action of external force, which causes the photovoltaic module to not well receive the solar radiation. Therefore, when the motor stops rotating, the photovoltaic module should be able to be locked at the preset angle. In the present application, the self-locking mechanism includes a containing groove and a locking groove in communication with each other, a locking piece and an elastic piece are arranged in the containing groove, under the action of the elastic force, the locking piece can be popped out of the containing groove to at least partially enter the locking groove, and because the size of at least part of the locking groove is smaller than the size of the locking piece along the elastic force direction of the elastic piece, when the locking piece is popped into the locking groove, the locking piece can abut against the inner wall of the locking groove, and then the locking piece is locked between the locking disc and the shell to realize self-locking and prevent the photovoltaic module from rotating under the action of external force. That is, the speed reducer of the present application adopts the self-locking mechanism for locking, without using the worm and worm shaft self-locking, the precision requirement of the equipment is low, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the speed reducer in an embodiment.
[0019] Figure 2 It is a structural schematic diagram of the speed reducer in an embodiment.
[0020] Figure 3 It is an exploded structural schematic diagram of the self-locking mechanism in an embodiment.
[0021] Figure 4 It is an internal structural schematic diagram of the self-locking mechanism in an embodiment.
[0022] Figure 5 It is a sectional schematic diagram of the self-locking mechanism in an embodiment.
[0023] Figure 6 It is a structural schematic diagram of the photovoltaic module tracking system in an embodiment.
[0024] 10, speed reducer; 20, motor; 30, photovoltaic module; 40, support; 50, housing; 60, transmission shaft; 110, first gear; 120, second gear; 200, self-locking mechanism; 210, driving shaft; 211, pawl; 220, housing; 230, locking disc; 231, inner disc; 232, protrusion; 233, accommodating groove; 234, through hole; 240, locking groove; 250, elastic member; 260, locking member. DETAILED DESCRIPTION
[0025] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.
[0026] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0027] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.
[0028] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0029] In the present application, unless specifically defined otherwise, if there is a description of the first feature "on" or "below" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is less than the second feature in horizontal height.
[0030] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.
[0031] Reference Figures 1-5The reducer 10 provided by the embodiment of the application comprises a gear set and a self-locking mechanism 200, the gear set at least comprises a first gear 110 and a second gear 120 connected in transmission, the diameter of the first gear 110 is greater than that of the second gear 120, and the first gear 110 is used for being connected with the photovoltaic module 30; the self-locking mechanism 200 comprises a driving shaft 210, a housing 220 and a locking disc 230, the locking disc 230 is connected with the second gear 120, the driving shaft 210 is used for being connected with the motor 20, and the driving shaft 210 can drive the locking disc 230 to rotate; the locking disc 230 is provided with a containing groove 233, the containing groove 233 contains a locking piece 260 and at least a part of an elastic piece 250, the housing 220 is sleeved outside the locking disc 230, the locking disc 230 and the housing 220 define a locking groove 240, the elastic piece 250 is used for enabling the locking piece 260 to be elastically inserted into the locking groove 240 from the containing groove 233 along the circumferential direction of the locking disc 230, and the locking piece 260 abuts against the housing 220 on the outer side along the radial direction of the locking disc 230 and abuts against the locking disc 230 on the inner side along the radial direction of the locking disc 230 in the locking groove 240.
[0032] In the embodiment, the locking disc 230 rotates synchronously with the second gear 120, the driving shaft 210 rotates synchronously with the motor 20, and the driving shaft 210 can drive the locking disc 230 to rotate, that is, when the motor 20 drives the driving shaft 210 to rotate, the driving shaft 210 can drive the locking disc 230 to rotate, the locking disc 230 drives the second gear 120 to rotate, the second gear 120 transmits the transmission to the first gear 110, and then the first gear 110 drives the photovoltaic module 30 to rotate, so that the angle of the photovoltaic module 30 is adjusted, and the photovoltaic module 30 is facilitated to receive the solar radiation to the maximum extent.
[0033] When the motor 20 drives the photovoltaic module 30 to adjust to the preset angle, the motor 20 stops rotating, at this time, the angle of the photovoltaic module 30 is easy to change (for example, is blown by the wind) under the action of external force, resulting in that the photovoltaic module 30 cannot well receive solar radiation, therefore, when the motor 20 drives the photovoltaic module 30 to adjust to the preset angle and stops rotating, the photovoltaic module 30 should be able to be locked at the preset angle to prevent the angle from changing under the action of external force. In the present application, the self-locking mechanism 200 includes a containing groove 233 and a locking groove 240 which are in communication with each other, and the locking piece 260 and at least part of the elastic piece 250 are located in the containing groove 233. Under the action of the elastic force, the locking piece 260 can be ejected out of the containing groove 233 to at least partially enter the locking groove 240. When the locking piece 260 is ejected into the locking groove 240, the locking piece 260 abuts against the housing 220 along the outer side of the radial direction of the locking disc 230, and the locking piece 260 abuts against the locking disc 230 along the inner side of the radial direction of the locking disc 230, thereby clamping the elastic piece 250 between the locking disc 230 and the housing 220. At this time, through the friction force between the elastic piece 250 and the locking disc 230, the locking disc 230 can be prevented from continuing to rotate, that is, the self-locking of the speed reducer can be achieved, and the photovoltaic module 30 under the action of external force can be prevented from rotating. That is, the speed reducer 10 of the present application is locked by using the self-locking mechanism 200, without using a worm self-locking mechanism, the precision requirement of the equipment is low, and the cost is low.
[0034] Further, along the elastic force direction of the elastic piece 250, the size of the locking groove 240 along the radial direction of the locking disc 230 gradually decreases, and the minimum size of the locking groove 240 along the radial direction of the locking disc 230 is smaller than the maximum size of the locking piece 260 along the radial direction of the locking disc 230. When the locking piece 260 moves along the circumferential direction of the locking disc 230 under the elastic action of the elastic piece 250, the locking piece 260 is gradually clamped between the locking disc 230 and the inner wall of the housing 220.
[0035] Specifically, the locking piece 260 is a roller, which facilitates reducing the friction between the locking piece 260 and the inner wall of the housing 220. The elastic piece 250 is a spring.
[0036] Of course, in other embodiments, along the elastic force direction of the elastic piece 250, the size of the locking groove 240 along the radial direction of the locking disc 230 can also be suddenly changed, as long as the locking piece 260 abuts against the housing 220 along the outer side of the radial direction of the locking disc 230 and abuts against the locking disc 230 along the inner side of the radial direction of the locking disc 230 when the locking piece 260 is in the locking groove 240.
[0037] In combination Figure 1 , the speed reducer 10 further includes an outer shell 50, and the gear set and the self-locking mechanism 200 are arranged in the outer shell 50. The first gear 110 is arranged outside the transmission shaft 60, and the speed reducer 10 is connected with the photovoltaic module 30 through the transmission shaft 60.
[0038] In some embodiments, the combination of 3 and Figure 4 One end of the driving shaft 210 is provided with a pawl 211, the locking disc 230 includes an inner disc 231 and at least two protrusions 232 arranged at intervals outside the inner disc 231, the pawl 211 extends into between two adjacent protrusions 232, and the pawl 211 abuts against the protrusions 232 along the circumference of the locking disc 230.
[0039] In the embodiment, the pawl 211 extends into between two adjacent protrusions 232, and the pawl abuts against the protrusions 232 along the circumference of the locking disc 230, so that when the motor 20 drives the driving shaft 210 to rotate, the driving shaft 210 can directly drive the protrusions 232 to rotate through the pawl 211, and then drive the locking disc 230 to rotate, the transmission efficiency of the driving shaft 210 is high, and the transmission is stable.
[0040] Specifically, the locking disc 230 is a circular structure, the locking disc 230 includes four protrusions 232, and one pawl 211 is inserted between each two adjacent protrusions 232, each pawl 211 abuts against two adjacent protrusions 232 on both sides along the circumference of the locking disc 230, when the pawl rotates, the pawl can directly push the protrusions 232, and then push the locking disc 230 to rotate. Four pawls 211 act on the locking disc 230 at the same time, the four pawls 211 are uniformly stressed, and damage to the pawl 211 can be avoided when a single pawl 211 is stressed too much.
[0041] Of course, in other embodiments, the number of pawls 211 and protrusions 232 can be three, five, six, etc., which is not limited here.
[0042] In some embodiments, the protrusion 232 is provided with a containing groove 233, the groove opening of the containing groove 233 is located on the side of the protrusion 232 away from the inner disc 231, the locking groove 240 is located between the protrusion 232 and the pawl 211, and the containing groove 233 and the locking groove 240 are communicated through the groove opening.
[0043] In the embodiment, the containing groove 233 is arranged on the protrusion 232, the groove opening of the containing groove 233 is located on the side of the protrusion 232 away from the inner disc 231, the containing groove 233 and the locking groove 240 are communicated through the groove opening, the elastic member 250 can push the locking member 260 from the containing groove 233 into the locking groove 240 through the groove opening, the outer side of the locking member 260 abuts against the inner wall of the shell 220, and the inner side of the locking member 260 abuts against the locking disc 230, that is, the locking member 260 is stuck in the locking groove 240.
[0044] Specifically, the protrusion 232 is a rectangular structure, and the groove opening of the containing groove 233 is arranged on the corner of the rectangular structure.
[0045] In some embodiments, the gap between two adjacent protrusions 232 gradually narrows along the radial inward direction of the locking disc 230, and the pawl 211 has a first end near the inner disc 231, the first end abutting against the corresponding protrusions 232 on both sides of the circumferential direction of the locking disc 230.
[0046] Specifically, the pawl 211 has a first end and a second end arranged radially outward along the locking disc 230. The first end of the pawl 211 is adapted to the curvature of the inner disc 231 and the two fit together. The second end of the pawl 211 is adapted to the curvature of the inner wall of the housing 220 so that the pawl 211 can rotate within the housing 220.
[0047] The pawl 211 abuts against the protrusions 232 on both sides only through the first end, and along the radial outward of the locking disc 230, the gap between two adjacent protrusions 232 gradually increases, so that there is still a certain gap between the pawl 211 and the two protrusions 232, which is convenient to use the gap as the locking groove 240.
[0048] In some embodiments, along the circumference of the locking disc 230, two receiving grooves 233 are sequentially provided on each protrusion 232, and a locking member 260 is respectively provided in each receiving groove 233.
[0049] In this embodiment, along the circumference of the locking disc 230, each receiving groove 233 is provided with a locking member 260. The two locking members 260 are used to lock the locking disc 230 when it rotates counterclockwise and when it rotates clockwise.
[0050] Furthermore, two adjacent receiving slots 233 are connected by a through hole 234, and an elastic element 250 is disposed in the through hole 234. Each receiving slot 233 is provided with a locking element 260, and the two ends of the elastic element 250 abut against the corresponding locking element 260.
[0051] In this embodiment, the elastic member 250 is disposed in the through hole 234 and is used to simultaneously push the two locking members 260 on the same protrusion 232 so that when the reducer 10 is stationary, the parts of the two locking members 260 can be locked in the locking groove 240, thereby achieving the locking of the reducer 10.
[0052] In some other embodiments, each receiving slot is provided with an elastic element and a locking element, and each elastic element is used to push the corresponding locking element so that the locking element can move from the receiving slot into the locking slot.
[0053] In some embodiments, the pawl 211 gradually increases in width along the circumferential direction of the locking disc 230 as it extends radially outward from the locking disc 230.
[0054] In the embodiment, the pawl 211 gradually increases in width along the circumference of the locking disc 230 radially outward, for example, the cross section of the pawl 211 along the axial direction is approximately trapezoidal structure. And since the pawl 211 only abuts against the protrusion 232 through the first end, when the motor 20 starts, the main shaft first drives the pawl 211 to rotate, the pawl 211 can rotate a small angle relative to the locking disc 230, so as to increase the abutting area with the locking disc 230, facilitate driving the locking disc 230 to rotate, and when the pawl 211 can rotate relative to the locking disc 230, the pawl 211 can also push the locking piece 260 to move, so that the locking piece 260 is unlocked.
[0055] In combination Figure 6 , the embodiment of the present application also provides a photovoltaic tracking system, the photovoltaic tracking system comprises the motor 20, the support 40 and the speed reducer 10, the motor 20 is installed at the bottom of the support 40, and the axial direction of the motor 20 is along the length direction of the support 40, the output shaft of the motor 20 is connected with the driving shaft 210, the first gear 110 is connected with the bottom of the photovoltaic module 30, and the motor 20 is used for driving the photovoltaic module 30 to rotate through the speed reducer 10.
[0056] In the embodiment, compared with the motor 20 being vertically arranged on the support 40 in the related art, the axial direction of the motor 20 is along the length direction of the support 40, and the arrangement of the motor 20 does not affect the swing of the photovoltaic module 30 on the support 40, that is, the swing angle of the photovoltaic module 30 can be increased.
[0057] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that the combinations are within the scope of the present application.
[0058] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation to the patent application scope. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.
Claims
1. A speed reducer characterized by, The speed reducer comprises: a gear set comprising at least a first gear and a second gear connected in transmission, the first gear having a larger diameter than the second gear, the first gear being used to connect with a photovoltaic module; and a self-locking mechanism comprising a driving shaft, a housing and a locking disc, the locking disc being connected with the second gear, the driving shaft being used to connect with a motor, the driving shaft being capable of driving the locking disc to rotate; the locking disc is provided with a receiving groove, the receiving groove containing a locking member and at least a partial elastic member, the housing being sleeved outside the locking disc, the locking disc and the housing defining a locking groove; the elastic member is used to make the locking member jump from the receiving groove into the locking groove along the circumferential direction of the locking disc, and in the locking groove, the locking member abuts against the housing on the outer side of the locking disc along the radial direction of the locking disc, and the locking member abuts against the locking disc on the inner side of the locking disc along the radial direction of the locking disc.
2. The speed reducer according to claim 1, characterized by One end of the driving shaft is provided with a pawl, the locking disc comprises an inner disc and at least two protruding portions spaced apart outside the inner disc, the pawl extends into between two adjacent protruding portions, and along the circumferential direction of the locking disc, the pawl abuts against the protruding portions.
3. The speed reducer according to claim 2, characterized by The protruding portions are provided with the receiving grooves, and the grooves of the receiving grooves are located on the side of the protruding portions away from the inner disc, the locking groove is located between the protruding portions and the pawl, and the receiving groove and the locking groove are communicated through the grooves.
4. The speed reducer according to claim 2, characterized by In the direction of the radial direction of the locking disc, the gap between two adjacent protruding portions gradually decreases, the pawl has a first end close to the inner disc, and the two sides of the first end along the circumferential direction of the locking disc abut against the corresponding protruding portions, respectively.
5. The speed reducer according to claim 2, characterized by Along the circumferential direction of the locking disc, two receiving grooves are sequentially provided on each protruding portion, and the locking member is arranged in each receiving groove, respectively.
6. The speed reducer according to claim 5, characterized by Two adjacent receiving grooves are connected through a through hole, the elastic member is arranged in the through hole, and the locking member is arranged in each receiving groove, respectively.
7. The speed reducer according to claim 2, characterized by Along the radial direction of the locking disc, the width of the pawl along the circumferential direction of the locking disc gradually increases.
8. The speed reducer of claim 1, wherein Along the elastic force direction of the elastic member, the size of the locking groove along the radial direction of the locking disc gradually decreases, and the minimum size of the locking groove along the radial direction of the locking disc is smaller than the maximum size of the locking member along the radial direction of the locking disc.
9. The speed reducer of claim 1, wherein The locking member is a roller.
10. A photovoltaic tracking system characterized by, The speed reducer comprises a motor, a horizontal support and the speed reducer according to any one of claims 1-9, the motor is installed at the bottom of the support, the axial direction of the motor is along the length direction of the horizontal support, the output shaft of the motor is connected with the driving shaft, the first gear is connected with the bottom of the photovoltaic module, and the motor is used to drive the photovoltaic module to rotate through the speed reducer.