Two-dimensional drive turntable for solar panels in the middle of dumbbell-shaped satellite structures

Abstract

The present invention discloses a two-dimensional solar sail panel drive turntable suitable for the middle of a dumbbell-shaped satellite structure. The structure is as follows: an azimuth axis assembly is installed in the middle of the satellite platform, connecting the upper and lower satellites and providing one-dimensional rotation along the axis of the shaft; left and right roll assemblies are connected to the outer rotor of the azimuth axis assembly by screws and rotate with the azimuth axis assembly; the left and right roll assemblies can achieve rolling rotation on their own axes; a housing is installed on the outside of the azimuth axis assembly drive motor and the left and right roll axes by screws, covering the protruding parts of the azimuth axis assembly and the protruding parts of the left and right roll assemblies; a cable bracket is fixedly connected to the left roll assembly housing in the housing by screws, and external cables are arranged on the cable bracket. By bundling the cables to the cable bracket, the cables will not get caught on the two-dimensional turntable during rotation. The present invention is placed in the middle of the satellite and, as part of the satellite body, not only meets the overall structural requirements of the satellite, but also realizes the two-dimensional solar orientation function.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical structure transmission devices, and relates to a two-dimensional drive turntable for solar panels suitable for the middle part of a dumbbell-shaped satellite structure, referred to as a "two-dimensional turntable". Background Art

[0002] The two-dimensional turntable is the actuator that enables small satellites to orient their solar panels toward the Sun. Through precise and stable servo control, the turntable drives the solar arrays for two-dimensional tracking of the Sun, maximizing the array's thermal-to-electricity conversion efficiency and ensuring the satellite's energy supply. It is a crucial component of the satellite. In the aerospace field, the most common solar array drive mechanisms currently exist primarily in single-axis configurations, with a limited number of dual-axis drive configurations. However, these drive mechanisms are limited in functionality, primarily focused on solar orientation, and the drive mechanism itself does not perform any structural function. The two-dimensional drive turntable described in this paper is located in the center of the satellite. Firstly, the turntable connects the upper and lower satellite bodies through its upper and lower end surfaces, giving the satellite a dumbbell-shaped overall shape and serving as the primary load-bearing component, maintaining its overall strength and rigidity. Secondly, the turntable uses high-precision drive control to drive the solar arrays on both sides for solar orientation.

[0003] The 2D turntable is a single-point device on a satellite. Operating in the harsh space environment of low pressure, weightlessness, cold darkness, and various electromagnetic radiation signals, it demands extremely high reliability. To avoid single-point failures and improve the reliability and lifespan of the 2D turntable during operation, reliability design is required to ensure that the overall function and performance of the device are not affected. Summary of the Invention

[0004] (1) Purpose of the invention

[0005] The purpose of the present invention is to provide a two-dimensional drive turntable for solar panels suitable for the middle part of a dumbbell-shaped satellite structure, so as to improve the reliability and life of the two-dimensional turntable during operation and ensure that the function and performance of the whole machine are not affected.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a two-dimensional drive turntable for solar panels suitable for the middle part of a dumbbell-shaped satellite structure, which includes: an azimuth axis assembly 3-1, a left roll assembly 3-2, a right roll assembly 3-3, a shell 3-4 and a cable bracket 3-5; the azimuth axis assembly 3-1 is the fixed part of the two-dimensional turntable, which is installed in the middle of the satellite platform, connects the upper and lower satellites and provides one-dimensional rotation along the axis of the shaft; the left roll assembly 3-2 and the right roll assembly 3-3 are connected to the outer rotor of the azimuth axis assembly 3-1 by screws, and rotate with the azimuth axis assembly 3-1 ...3 is connected to the outer rotor of the azimuth axis assembly 3-1 by screws, and rotates with the left roll assembly 3-1; the left roll assembly 3-3 is connected to the outer rotor of the azimuth axis assembly 3-1 by screws, and rotates with the left roll assembly 3-1; the left roll assembly 3-1 is connected to the outer rotor of the azimuth axis assembly 3-1 The rolling assembly 3-2 and the right rolling assembly 3-3 can achieve rolling rotation on their own axes; the shell 3-4 is installed on the outside of the azimuth axis assembly 3-1 driving motor and the left rolling axis 3-2 and the right rolling axis 3-3 by screws, and covers the protruding parts of the azimuth axis assembly 3-1 and the protruding parts of the left rolling assembly 3-2 and the right rolling assembly 3-3; the cable bracket 3-5 is fixedly connected to the left rolling assembly shell in the shell 3-4 by screws, and external cables are arranged on it. By bundling the cables on the cable bracket 3-5, the cables will not be hooked on the two-dimensional turntable during rotation.

[0008] (3) Beneficial effects

[0009] The two-dimensional drive turntable for solar panels in the middle of a dumbbell-shaped satellite structure provided by the above technical solution has the following beneficial effects:

[0010] (1) The two-dimensional turntable adopts the satellite integration design concept and is placed in the middle of the satellite for the first time. As a part of the satellite body, it not only meets the overall structural requirements of the satellite, but also realizes the two-dimensional solar orientation function.

[0011] (2) As a load installation space of no less than φ290mm must be reserved inside the two-dimensional drive turntable, an ultra-large vacuum thin-walled bearing with an inner diameter of 300mm was used for the first time. This broke through the large interference nesting technology of magnesium alloy shafts and stainless steel rings, and has the characteristics of large hollowness and high rigidity, solving the problem of mismatched radial material expansion of the shaft system under vacuum environment.

[0012] (3) The two-dimensional turntable adopts a redundant design of hardware and software and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of two-dimensional turntable application.

[0014] Figure 2 Schematic diagram of the two-dimensional turntable structure.

[0015] Figure 3 This is a diagram of the two-dimensional turntable composition.

[0016] Figure 4It is a structural diagram of the azimuth axis assembly, and Figure A and Figure B are schematic diagrams of two different states respectively.

[0017] Figure 5 It is a cross-sectional view of the azimuth axis system.

[0018] Figure 6 This is the stator shaft structure diagram.

[0019] Figure 7 This is the rotor seat structure diagram.

[0020] Figure 8 This is the lower flange structure diagram.

[0021] Figure 9 This is the upper flange structure diagram.

[0022] Figure 10 This is the structural diagram of the roll axis system.

[0023] Figure 11 This is the structural diagram of the rolling gear.

[0024] Figure 12 This is the schematic diagram of zero calibration.

[0025] Figure 13 This is the structure diagram of the zero pressure ring.

[0026] Figure 14 The diagram below shows the cable layout.

[0027] Figure 15 This is the workflow diagram of the two-dimensional turntable. DETAILED DESCRIPTION

[0028] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0029] The 2D turntable is located in the middle of the satellite and adopts the design concept of satellite and turntable structure integration. The upper and lower ends of the azimuth axis of the 2D turntable are connected to the upper and lower satellite bodies, and the roll axes on both sides are connected to the solar array. Through servo control, the azimuth and roll two-dimensional directional movement towards the sun is performed. The overall layout is shown as follows Figure 1 As shown, on the one hand, the two-dimensional turntable serves as the main load-bearing component to connect the upper and lower satellite bodies, making the satellite dumbbell-shaped and maintaining overall rigidity; on the other hand, through precise servo control, the solar cell arrays on both sides are driven to always face the sun.

[0030] This embodiment develops a new type of two-dimensional driving turntable for dumbbell-type satellites. The turntable has a two-dimensional rotation function and high reliability. The structure is shown in the figure below. Figure 2 shown.

[0031] like Figure 3As shown, the solar sail panel two-dimensional drive turntable suitable for the middle part of the dumbbell-shaped satellite structure includes an azimuth axis component 3-1, a left roll component 3-2, a right roll component 3-3, a shell 3-4 and a cable bracket 3-5.

[0032] The azimuth axis assembly 3-1 is the fixed portion of the 2D turntable, mounted in the center of the satellite platform. Its primary function is to connect the upper and lower satellites and provide one-dimensional rotation along the central axis. The left and right roll assemblies 3-2 and 3-3 are screwed to the outer rotor of the azimuth axis assembly 3-1 and rotate with it. The left and right roll assemblies 3-2 and 3-3 can roll around their own axes. The housing 3-4 is screwed to the drive motor of the azimuth axis assembly 3-1 and the outer sides of the left and right roll axes 3-2 and 3-3. Its primary function is to cover the protruding portions of the azimuth axis assembly 3-1, as well as the protruding portions of the left and right roll assemblies 3-2 and 3-3, protecting them from external contaminants. The cable bracket 3-5 is screwed to the left roll assembly housing within the housing 3-4. Its primary function is to route external cables. By bundling the cables to the cable bracket 3-5, the 2D turntable will not snag during rotation.

[0033] like Figure 4 As shown, the azimuth axis assembly 3-1 includes an azimuth axis system assembly 4-1, an azimuth motor assembly 4-2, an azimuth potentiometer assembly 4-3 and an azimuth switch assembly 4-4.

[0034] Azimuth shaft assembly 4-1 provides azimuth rotational freedom and connects the upper and lower satellites. Azimuth motor assembly 4-2 is fixed to the rotor of azimuth shaft assembly 4-1 via two sets of screws. During installation and pre-tightening, the motor mount is trimmed to adjust the meshing between azimuth motor assembly 4-2 and azimuth shaft assembly 4-1, ensuring smooth and uninterrupted transmission. The drive motor of azimuth motor assembly 4-2 utilizes a permanent magnet stepper motor with redundant windings. It also employs a high-reduction-ratio planetary reducer, whose gears are coated with vacuum grease to reduce vacuum volatility, ensuring sufficient drive torque margin and a long lifespan. A multi-turn, wire-wound azimuth potentiometer assembly 4-3 serves as the primary position feedback element and is fixed to the rotor of azimuth shaft assembly 4-1 via screws. During installation and pre-tightening, the potentiometer mount is trimmed to adjust the meshing between azimuth potentiometer assembly 4-3 and azimuth shaft assembly 4-1, ensuring smooth and uninterrupted transmission.

[0035] This embodiment utilizes an azimuth potentiometer for angle measurement, offering the advantages of small size, light weight, and high accuracy. By performing multi-point calibration on the azimuth potentiometer prior to commissioning and fitting its actual resistance-angle curve, the angle measurement accuracy is improved to 0.5°. Furthermore, leveraging the constant step angle of the azimuth motor, angle position feedback is provided by counting motor steps to prevent the system from losing angle measurement after a potentiometer failure. Step-counting angle measurement also presents the problem of data loss after a power outage. When the system is powered back on, the step-counting angle measurement starts from zero, which is inconsistent with the mechanical zero position, rendering the step-counting angle measurement ineffective. Two solutions can be employed. First, zero-position calibration is performed using azimuth switch assembly 4-4. When the two-dimensional turntable is powered back on, the rotor rotates to the mechanical zero position, triggering azimuth switch 4-4. Upon triggering, the step-counting angle is reset to zero, achieving consistency with the mechanical zero position. Second, during operation, the two-dimensional turntable continuously reports the step-counting angle value to the satellite control computer. Upon powering back on, the satellite control computer reassigns the step-counting angle value, ensuring uninterrupted step counting.

[0036] like Figure 5 As shown, the azimuth shaft assembly 4-1 provides azimuth freedom and supports the upper and lower satellites. It consists of a stator shaft 5-1, a rotor base 5-2, a lower flange 5-3, an upper flange 5-4, a wire housing 5-5, an outer ring 5-6, an angular contact bearing 5-7, and an inner ring 5-8. The stator shaft 5-1 is a fixed shaft. The inner ring 5-8 is mounted on the upper and lower stepped surfaces of the stator shaft 5-1 with a large interference fit. The bearing mating surface of the inner ring 5-8 is finished secondary, and the outer surface of the second-finished inner ring 5-8 mates with the inner ring of the angular contact bearing 5-7. Similarly, the outer ring 5-6 is mounted on the inner step of the rotor base 5-2 with a large interference fit. The bearing mating surface of the outer ring 5-6 is finished secondary, and the inner surface of the second-finished outer ring 5-6 mates with the outer ring of the angular contact bearing 5-7. Angular contact bearings 5-7 are installed back-to-back, with the lower flange 5-3 and upper flange 5-4 screwed to the upper and lower ends of the stator shaft 5-1. During installation, the bearing surfaces of the lower and upper flanges 5-3 and 5-4 can be trimmed to ensure secure preload, ensuring smooth and stable rotation of the azimuth shaft 4-1. The stator shaft 5-1 is made of magnesium alloy. To address the thermal expansion mismatch between the magnesium alloy and the stainless steel bearing material, a stainless steel inner ring 5-7 is installed on the stator shaft 5-1. The stainless steel inner ring 5-7 and the bearing have an interference fit. During installation, the stator shaft 5-1 is placed in a -70°C temperature chamber, and the stainless steel inner ring 5-7 is placed in a 100°C temperature chamber. Special tooling is used to ensure proper installation. After installation, secondary finishing is performed. The rotor seat 5-2 and outer ring 5-6 are similarly designed. Angular contact bearings 5-8 are installed in pairs, back-to-back, to improve radial support stiffness. The rotating bearing steel balls and polyimide cages are treated with solid molybdenum disulfide coating to prevent vacuum cold welding.

[0037] like Figure 6As shown, stator shaft 5-1 is made of magnesium alloy and features a hollow design with an inner diameter of φ290mm, leaving space for satellite payload installation. The inner ring is evenly distributed with reinforcing ribs to enhance rigidity and features circular holes for weight reduction. The stator shaft has two annular surfaces in the middle, forming an interference fit with the inner ferrule 5-7. Threaded holes connect the upper and lower flanges to the upper and lower end surfaces.

[0038] like Figure 7 As shown, the rotor base 5-2 is a hollow aluminum alloy with upper and lower end surfaces that form an interference fit with the outer ring 5-6. Circular holes are located on both sides of the end surfaces for connection to the roll shaft system. Limiting posts are located outside the holes to provide mechanical stops for the roll shaft system. Mounting ports for the drive motor assembly, goniometer assembly, and switch assembly are located on both sides. Triangular weight-reducing holes are located on the outside of the rotor base 5-2, ensuring rigidity while reducing structural weight.

[0039] like Figure 8 As shown, the lower flange 5-3 primarily serves to preload the bearing and connect to the lower satellite. The outer side is evenly distributed with reinforced diagonal ribs and weight-reducing circular holes, and both ends have parallel cuts to meet the requirements for satellite installation.

[0040] like Figure 9 As shown, upper flange 5-4 primarily serves to preload the bearings and connect to the upper satellite. The outer periphery of the upper flange is designed with spur gears, featuring a module of 1, 330 teeth, and a 6mm tooth width. The gear surface is coated with a molybdenum disulfide solid lubricant film to prevent vacuum cold welding. The spur gears feature half-circle teeth with a ±90° rotation range and mesh with the active pinion of azimuth motor 4-2. The pinion has a module of 1, 30 teeth, and a 6mm tooth width. The gears have limit bosses at both ends, reinforced with diagonal ribs and weight-reducing circular holes evenly distributed on the outside, and parallel cross-sections at both ends to meet the requirements for satellite installation.

[0041] like Figure 10As shown, the left and right roll assemblies 3-2 and 3-3 share the same structural components. Taking the left roll assembly 3-2 as an example, the roll axis system 3-2 primarily consists of the roll stator base 10-1, the roll rotor base 10-2, the inner pressure ring 10-3, the outer pressure ring 10-4, the drive gear 10-5, the roll potentiometer 10-6, the roll motor 10-7, and the roll switch 10-8. The roll stator base 10-1 is screwed to the corresponding mating holes in the rotor base 5-2. The roll rotor base 10-2 is mounted on the roll stator base 10-1 using angular contact bearings. Back-to-back preload is achieved by the inner pressure ring 10-3 and the outer pressure ring 10-4, enhancing radial support stiffness. The bearing balls and polyimide retainer are treated with a solid molybdenum disulfide coating. The drive gear 10-5 is screwed to the rear of the roll rotor base 10-2, forming an integral part of the base. The roll motor 10-7 and roll potentiometer 10-6 are mounted on either side of the shaft system and fixed to the azimuth rotor base 5-2, forming a 63° angle with the shaft system. The mounting brackets for roll potentiometer 10-6 and roll motor 10-7 should be adjusted to ensure smooth and stable meshing of the potentiometer gear, motor gear, and drive gear 10-5. The roll shaft system primarily connects the solar arrays on both sides, achieving ±135° reciprocating oscillation around the roll axis. The drive motor utilizes an open-loop permanent magnet stepper motor with backup windings. The angle measurement principle is the same as the azimuth shaft system, using a multi-turn wirewound potentiometer assembly 10-6 as primary feedback and step angle measurement as backup. The roll switch assembly 10-8 is fixed to the azimuth rotor base 5-2 with screws. It triggers when the roll axis rotates to the mechanical zero position, performing zero calibration. Furthermore, the satellite control computer can reassign angle values ​​after a system power outage and restart, ensuring uninterrupted step angle measurement.

[0042] like Figure 11 As shown, bevel gears are distributed on the surface of the large roll drive gear, with a module of 0.5, 120 teeth and a tooth width of 4 mm.

[0043] like Figure 12 As shown in the figure, a zeroing ring 12-1 is installed on the back of the roll gear. The zeroing ring 12-1 works together with the zeroing switch to complete the zero position calibration of the roll axis system.

[0044] like Figure 13 As shown, the zeroing pressure ring 12-1 has a cylindrical surface feature 13-1, which interacts with the switch pressure rod. The cylindrical surface is coated with a molybdenum disulfide solid lubricant coating to prevent cold welding. The cylindrical surface has a boss feature 13-2, which compresses the switch to trigger the zeroing signal. The cylindrical surface also has a leg feature 13-3, which forms a ±135° rotation range with the azimuth rotor base 5-2.

[0045] According to the thermal control design requirements, the stator, rotor and protective shell of the turntable are sprayed with thermal control white paint. The surface of white paint has high thermal stability and low absorption rate, which can also reduce temperature fluctuations.

[0046] When the two-dimensional turntable drives the solar cell array to track the sun, the cables swing with the azimuth and roll. It is necessary to prevent the cables from getting hooked. The cables are divided into left and right axis cables, which pass through from under the left roll axis. There are cable interfaces on the surface of the two-dimensional turntable and the interface of the solar cell array. The cables rotate in azimuth by ±90°. During the rotation of the two-dimensional turntable, the cables can move freely without causing pulling. In order to prevent the components on the surface of the two-dimensional turntable from getting hooked on the cables, protective shells are added to the motors, potentiometers and other devices. At the same time, the shell surface adopts large rounded transitions, and countersunk screws and other measures are adopted. The protruding parts of the outer periphery of the turntable are covered as a whole with a metal shell, and the corners are rounded, such as Figure 14 shown.

[0047] To improve system reliability, the system adopts a redundant design. The hardware system utilizes a complete cold and hot backup design. The cold and hot hardware sets have identical functions and principles and are physically isolated. The hot engine primarily utilizes thoroughly screened, standard military-grade and industrial-grade components, reducing costs. The cold engine utilizes aerospace-grade components or components with satellite experience to ensure reliability. Hot backup is implemented for key modules in both the cold and hot units, such as the core driver and communication module. Upon power-up, the hot engine operates. If a hardware failure occurs during rotation, the satellite control computer can control the cold engine switchover without impacting the entire satellite mission. The software system utilizes a multi-mode voting mechanism to prevent erroneous instructions from being issued due to register flips caused by radiation.

[0048] After the two-dimensional turntable is launched into orbit, the satellite computer supplies power to the main circuit board and starts communicating. After the circuit board passes the self-check, it reports the correct information to the satellite computer. At the same time, it receives the motion instructions from the satellite computer, and the servo system drives the azimuth and pitch axis positions to zero, and reports the zeroing status; after the zeroing is completed, it waits for the next instruction from the satellite computer. Depending on the motion instructions received, it enters different working modes (stop and hold, tracking, capture). During the normal operation of the two-dimensional turntable, the position and speed control information of the satellite computer is received in real time, and the azimuth and roll closed-loop control is performed to complete the orientation to the sun. The workflow is as follows Figure 15 shown.

[0049] The two-dimensional drive turntable has four working modes under normal conditions: tracking, capturing, zeroing and stop holding.

[0050] (1) Tracking mode

[0051] Tracking mode is the most common operating state for the 2D drive turntable. In tracking mode, the satellite control computer sends data instructions, including operating speed and position, via the CAN data bus. The servo drive module plans a trajectory based on the tracking algorithm, controlling the 2D turntable to drive the solar arrays on both sides to track the sun at a constant speed. In tracking mode, the 2D drive turntable's speed fluctuations are minimal.

[0052] (2) Capture mode

[0053] The 2D drive turntable maintains tracking mode under normal conditions. When the satellite control computer detects a significant angular deviation between the normal direction of the sailboard and the direction of sunlight, it transmits the position to the 2D drive turntable. The servo drive system then increases its rotational speed to quickly capture the sun. The capture mode flow chart is the same as the tracking mode flow chart.

[0054] (3) Zeroing mode

[0055] After the satellite is launched into orbit, the solar panels unfold normally and return to their initial mechanical zero position, which serves as the starting point for two-dimensional motion. The process of the two-dimensional drive turntable driving the solar array back to its initial mechanical zero position is called zeroing mode.

[0056] (4) Stall and hold

[0057] After the two-dimensional drive turntable receives the stop and hold command from the satellite computer, the azimuth and pitch motors are both in the power-on hold state. At this time, the position of the solar sail panel relative to the star is fixed.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A two-dimensional drive turntable for solar panels suitable for the middle part of a dumbbell-shaped satellite structure, characterized in that: include: The invention relates to an azimuth axis assembly (3-1), a left roll assembly (3-2), a right roll assembly (3-3), a shell (3-4) and a cable bracket (3-5); the azimuth axis assembly (3-1) is the fixed part of the two-dimensional turntable, which is installed in the middle of the satellite platform, connects the upper and lower satellites and provides one-dimensional rotation along the axis of the axis; the left roll assembly (3-2) and the right roll assembly (3-3) are connected to the outer rotor of the azimuth axis assembly (3-1) by screws and rotate with the azimuth axis assembly (3-1); the left roll assembly (3-2) and the right roll assembly (3-3) can realize rolling on their own axis. The housing (3-4) is mounted on the outside of the azimuth axis assembly (3-1) driving motor and the left and right roll assemblies (3-2 and 3-3) by screws, and covers the protruding portion of the azimuth axis assembly (3-1) and the protruding portions of the left and right roll assemblies (3-2 and 3-3); the cable bracket (3-5) is fixedly connected to the left roll assembly housing in the housing (3-4) by screws, and external cables are arranged on the bracket. By bundling the cables on the cable bracket (3-5), the cables are prevented from getting caught on the two-dimensional turntable during its rotation.

2. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 1, characterized in that: The azimuth axis assembly (3-1) comprises an azimuth axis assembly (4-1), an azimuth motor assembly (4-2), an azimuth potentiometer assembly (4-3) and an azimuth switch assembly (4-4); the azimuth axis assembly (4-1) provides azimuth rotation freedom and connects upper and lower satellites; the azimuth motor assembly (4-2) is fixedly mounted on the rotor of the azimuth axis assembly (4-1) by two sets of upper and lower screws; when pre-tightened during installation, the azimuth motor assembly (4-2) is adjusted by trimming the motor seat. ) and the azimuth shaft assembly (4-1) to ensure smooth transmission; the azimuth motor assembly (4-2) drive motor adopts a permanent magnet stepper motor with winding backup; the multi-turn wire-wound azimuth potentiometer assembly (4-3) serves as the main position feedback element and is fixed to the rotor of the azimuth shaft assembly (4-1) by screws; when installing pre-tightening, the degree of engagement between the azimuth potentiometer assembly (4-3) and the azimuth shaft assembly (4-1) is adjusted by trimming the potentiometer seat.

3. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 2, characterized in that: The azimuth shaft assembly (4-1) provides azimuth freedom and supports upper and lower stars, and comprises a stator shaft (5-1), a rotor seat (5-2), a lower flange (5-3), an upper flange (5-4), a wire protection shell (5-5), an outer ring (5-6), an angular contact bearing (5-7) and an inner ring (5-8); the stator shaft (5-1) is a fixed shaft, and the inner ring (5-8) is installed on the upper and lower step surfaces of the stator shaft (5-1) through a large interference fit, and the bearing mating surface of the inner ring (5-8) is subjected to secondary fine processing, and is used The outer surface of the inner ring (5-8) after secondary processing is matched with the inner ring of the angular contact bearing (5-7); the outer ring (5-6) is installed on the inner step of the rotor seat (5-2) with a large interference fit, and the bearing matching surface of the outer ring (5-6) is subjected to secondary fine processing; the inner surface of the outer ring (5-6) after secondary processing is matched with the outer ring of the angular contact bearing (5-7); the angular contact bearing (5-7) is installed back to back, and the lower flange (5-3) and the upper flange (5-4) are fixed to the upper and lower end surfaces of the stator shaft (5-1) by screws.

4. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 3, characterized in that: The stator shaft (5-1) is made of magnesium alloy and has a hollow design, which reserves installation space for satellite payloads; the inner ring is evenly distributed with reinforcing ribs and is designed with weight-reducing circular holes.

5. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 4, characterized in that: The middle of the stator shaft (5-1) has two layers of annular surfaces, which form an interference fit with the inner ring (5-8); the upper and lower end surfaces are evenly distributed with threaded holes connected to the upper flange (5-4) and the lower flange (5-3).

6. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 5, characterized in that: The rotor seat (5-2) is designed to be hollow in aluminum alloy, with upper and lower end faces inside, forming an interference fit with the outer ring (5-6); the end faces on both sides are provided with matching circular holes, connected to the transverse rolling shaft system; the outer sides of the circular holes are provided with limiting columns, forming a mechanical limit with the transverse rolling shaft system; the two sides are provided with installation interfaces for the drive motor assembly, the angle measuring potentiometer assembly, and the switch assembly; and the outer side of the rotor seat (5-2) is provided with a triangular weight-reducing hole.

7. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 6, characterized in that: The lower flange (5-3) is used for pre-tightening the bearing and is connected to the lower star body; the outer side is evenly distributed with strengthening oblique ribs and weight-reducing circular holes, and both ends have parallel sections to meet the installation requirements of the star body.

8. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 7, characterized in that: The upper flange (5-4) is used to preload the bearing and is connected to the upper star body; the outer periphery of the upper flange (5-4) is designed with spur teeth, the gear module is 1, the number of teeth is 330, and the tooth width is 6mm; the gear surface is plated with a molybdenum disulfide solid lubricating film layer; the spur gear is a half-circle tooth, the rotation range meets ±90°, and is engaged with the active pinion of the azimuth motor assembly (4-2) for transmission; the pinion has a module of 1, the number of teeth is 30, and the tooth width is 6mm.

9. The solar sail panel two-dimensional drive turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 8, characterized in that: The left roll assembly (3-2) and the right roll assembly (3-3) have the same structural composition; the left roll assembly (3-2) comprises a roll stator seat (10-1), a roll rotor seat (10-2), an inner pressure ring (10-3), an outer pressure ring (10-4), a driving gear (10-5), a roll potentiometer (10-6), a roll motor (10-7) and a roll switch (10-8); the roll stator seat (10-1) is fixed to the corresponding matching hole of the rotor seat (5-2) by screws, the roll rotor seat (10-2) is mounted on the roll stator seat (10-1) by an angular contact bearing, and the inner pressure ring (10-3) and the outer pressure ring are used to fix the roll stator seat (10-1) and the roll rotor seat (10-2) to the roll stator seat (10-1). (10-4) realizes back-to-back pre-tightening; the driving gear (10-5) is fixedly connected to the rear of the roll rotor seat (10-2) by screws to form an integral part thereof; the roll motor (10-7) and the roll potentiometer (10-6) are separately installed on both sides of the shaft system and fixedly connected to the azimuth rotor seat (5-2), with an angle of 63° with the shaft system; the height of the mounting bracket of the roll potentiometer (10-6) and the roll motor (10-7) is adjusted to ensure that the potentiometer gear, the motor gear and the driving gear (10-5) are smoothly engaged; the roll switch (10-8) is fixedly connected to the azimuth rotor seat (5-2) by screws and is triggered when the roll axis rotates to the mechanical zero position to perform zero position calibration.

10. The solar sail panel two-dimensional driving turntable suitable for the middle part of a dumbbell-shaped satellite structure according to claim 9, characterized in that: A return-to-zero pressure ring (12-1) is installed on the back of the driving large gear (10-5), and the return-to-zero pressure ring (12-1) and the return-to-zero switch work together to complete the zero position calibration of the rolling axis system.

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