A dual-degree-of-freedom sun-orientation drive device for Pina satellite solar panels

Abstract

The present invention discloses a dual-degree-of-freedom sun-orienting drive device for a Pina satellite solar panel, and relates to the field of aerospace. A piezoelectric material-carbon fiber composite material is used as a motor stator to achieve lightweight; an ultrasonic motor is installed in two orthogonal planes to achieve two-degree-of-freedom rotation of the panel, so as to track the sun and improve power generation efficiency. It includes a base for connecting the Pina satellite, a solar panel support structure for connecting the solar panel, and a pitch axis base connected therebetween; it also includes two ultrasonic motors, which are a yaw axis motor and a pitch axis motor. The two-degree-of-freedom rotation of the panel is achieved to track the sun, so as to improve power generation efficiency. Under the same energy demand, the weight of the solar panel device can be greatly reduced and the system structure of the Pina satellite can be simplified.

Description

Technical Field

[0001] The invention relates to the field of aerospace, and in particular to an optimized design of an ultrasonic motor, a reasonable design of a structure, and an application in a solar sailboard of a Pina satellite. Background Art

[0002] The solar array drive assembly (SADA) consists of a solar array drive mechanism and a solar array drive line. Its main functions are to support the solar array, drive the solar array to orient itself toward the sun, and transmit electrical power and signals between the solar array and the aircraft.

[0003] 1) Most of the current solar panels have a large and heavy drive system, so they cannot be used in PINA satellites.

[0004] 2) The current solar panel drive device has low precision and cannot meet the stability and precision requirements of the PINA satellite.

[0005] Ultrasonic motor is a new concept of micro motor. Its working principle is to use the inverse piezoelectric effect of piezoelectric materials to stimulate the elastic body to vibrate slightly in the ultrasonic frequency band, and convert it into the rotation (linear) motion of the rotor (motor) through the friction between the stator and the rotor. Ultrasonic motors are favored by aerospace practitioners for their small size, light weight, strong environmental adaptability, and good electromagnetic compatibility. They can easily cope with environments such as large temperature differences between day and night, solar magnetic storms, and space radiation, so they are ideal driving components for aircraft. Summary of the invention

[0006] In view of the above problems, the present invention proposes a dual-degree-of-freedom sun-orienting drive device for Pina satellite solar panels, which aims to improve the power generation efficiency of the solar panels for Pina satellites. Ultrasonic motors are installed in two orthogonal planes to achieve two-degree-of-freedom rotation of the panels, thereby tracking the sun and improving the power generation efficiency.

[0007] The technical solution of the present invention is as follows: the dual-degree-of-freedom solar orientation driving device comprises a base 1 for connecting a Pina satellite, a solar sail panel support structure 6 for connecting a solar sail panel, and a pitch axis base 3 connected therebetween, the pitch axis base 3 is rotatably connected to the base 1, and the solar sail panel support structure 6 is rotatably connected to the pitch axis base 3;

[0008] The dual-degree-of-freedom solar orientation drive device also includes two ultrasonic motors, which are a yaw-axis motor 2 and a pitch-axis motor 4. The stator of the yaw-axis motor 2 is connected to the base 1, and the rotor of the yaw-axis motor 2 is connected to the pitch-axis base 3; the stator of the pitch-axis motor 4 is connected to the pitch-axis base 3, and the rotor of the pitch-axis motor 4 is connected to the solar panel support structure 6.

[0009] The ultrasonic motor includes a motor stator 7 and a motor rotor 8; the motor stator 7 includes a motor body 10, a ceramic column 11 and a pair of support seats;

[0010] The motor body 10 in the motor stator 7 is made of a piezoelectric material-carbon fiber composite material;

[0011] The support seat includes an L-shaped fixing seat, a guide bolt and a spring. The fixing seat is fixedly connected to the base 1 or the pitch axis base 3. The guide bolt is threadedly connected to the fixing seat. The spring is sleeved on the guide bolt.

[0012] The motor body 10 is arranged between a pair of support seats, and guide sliders 9 are fixedly connected to both sides of the motor body 10, the guide sliders 9 are loosely sleeved on the guide bolts, and the spring is between the guide slider 9 and the fixed seat, and the guide bolts and the spring provide restraint force and preload force for the motor body 10;

[0013] The motor rotor 8 is fixedly connected to the pitch axis base 3 or the solar sail panel supporting structure 6;

[0014] The motor body 10 has a groove parallel to the axial direction of the motor rotor 8 on one side surface facing the motor rotor 8. The ceramic column 11 is installed in the groove and contacts the motor rotor 8. The motor rotor 8 rotates through the contact and interaction force between the ceramic column 11 in the motor stator 7 and the motor rotor 8.

[0015] The dual-degree-of-freedom solar orientation driving device further comprises two angular displacement sensors 5 for measuring the rotation angle of the rotor of the ultrasonic motor.

[0016] The axes of the rotors of the two ultrasonic motors are orthogonal.

[0017] The base 1, the pitch axis base 3, and the solar sail panel supporting structure 6 are all made of nylon material. At the same time, the base 1 and the pitch axis base 3 are hollowed out.

[0018] The base 1 is provided with a first boss, the pitch axis base 3 is rotatably connected to the first boss via a bearing, and a gap is left between the pitch axis base 3 and the base 1;

[0019] Similarly, a second boss is provided on the pitch axis base 3 , and the solar sail panel supporting structure 6 is rotatably connected to the second boss via a bearing, and a gap is also left between the pitch axis base 3 and the solar sail panel supporting structure 6 .

[0020] The present invention aims to improve the power generation efficiency of solar panels for Pina satellites. It is a dual-degree-of-freedom sun-orientation drive device that can achieve two-dimensional 360-degree rotation. The device installs ultrasonic motors in two orthogonal planes and connects the panels and motors with bearings to achieve two-degree-of-freedom rotation of the panels, thereby tracking the sun and improving power generation efficiency. Under the same energy demand, the weight of the solar panel device can be greatly reduced and the system structure of the Pina satellite can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the structural diagram of this case.

[0022] Figure 2 This is the structural diagram of the pitch axis motor in this case.

[0023] Figure 3 This is the structural diagram of the yaw axis motor in this case.

[0024] Figure 4 This is a top view of the ultrasonic motor in this case.

[0025] Figure 5 is a three-dimensional diagram of the ultrasonic motor in this case.

[0026] Figure 6 It is a schematic diagram of the implementation method of this case.

[0027] Figure 7 It is a structural schematic diagram of the motor stator in this case.

[0028] In the figure: 1. base, 2. yaw axis motor, 3. pitch axis base, 4. pitch axis motor, 5. angular displacement sensor, 6. solar panel supporting structure, 7. motor stator, 8. motor rotor, 9. guide slider, 10. motor body, 11. ceramic column, 12. piezoelectric ceramic layer, 13. carbon fiber composite material layer. DETAILED DESCRIPTION

[0029] In order to clearly illustrate the technical features of this patent, this patent is elaborated in detail below through a specific implementation method and in combination with its accompanying drawings.

[0030] The present invention Figure 1-7As shown, the dual-degree-of-freedom solar orientation drive device comprises a base 1 for connecting the Pina satellite, a solar sail panel support structure 6 for connecting the solar sail panel, and a pitch axis base 3 connected therebetween, the pitch axis base 3 is rotatably connected to the base 1, the solar sail panel support structure 6 is rotatably connected to the pitch axis base 3, and the two rotatable rotation axes are perpendicular to each other;

[0031] The dual-degree-of-freedom solar orientation driving device further includes two ultrasonic motors, which are respectively a yaw axis motor 2 and a pitch axis motor 4. The stator of the yaw axis motor 2 is connected to the base 1, and the rotor of the yaw axis motor 2 is connected to the pitch axis base 3; the stator of the pitch axis motor 4 is connected to the pitch axis base 3, and the rotor of the pitch axis motor 4 is connected to the solar sail panel support structure 6. In this way, the pitch axis base 3 and the solar sail panel support structure 6 can be driven to rotate by the two ultrasonic motors, thereby realizing dual-degree-of-freedom rotation drive of the solar sail panel.

[0032] The ultrasonic motor includes a motor stator 7 and a motor rotor 8; the motor stator 7 includes a motor body 10, a ceramic column 11 and a pair of support seats;

[0033] The motor body 10 in the motor stator 7 is made of a piezoelectric material-carbon fiber composite material, which includes alternately stacked piezoelectric ceramic layers 12 and carbon fiber composite materials 13, so as to achieve lightweight and reduce the overall weight of the mechanism;

[0034] The support seat includes an L-shaped fixing seat, a guide bolt and a spring. The fixing seat is fixedly connected to the base 1 or the pitch axis base 3. The guide bolt is threadedly connected to the fixing seat. The spring is sleeved on the guide bolt.

[0035] The motor body 10 is arranged between a pair of support seats, and guide sliders 9 are fixedly connected to both sides of the motor body 10, the guide sliders 9 are loosely sleeved on the guide bolts, and the spring is between the guide slider 9 and the fixed seat, and the guide bolts and the spring provide the motor body 10 with appropriate restraining force and preload force;

[0036] The motor rotor 8 is fixedly connected to the pitch axis base 3 or the solar sail panel supporting structure 6;

[0037] The motor body 10 has a groove parallel to the axial direction of the motor rotor 8 on one side surface facing the motor rotor 8. The ceramic column 11 is installed in the groove and contacts the motor rotor 8. The motor rotor 8 rotates through the contact and interaction force between the ceramic column 11 in the motor stator 7 and the motor rotor 8.

[0038] Specifically, the motor body 10 is mainly composed of a large rectangular block and two small rectangular blocks. The large rectangular block mainly determines the vibration mode of the motor. The small rectangular block is a guide slider with a light hole drilled thereon, which is mainly used to fix the motor in a supporting manner. A circular groove is opened on one side of the short side of the motor body 10 for installing a ceramic column 11. The ceramic column 11 is a cylinder and is glued into the groove of the motor body 10.

[0039] The yaw-axis motor 2 and the pitch-axis motor 4 are fixed to the motor support structure by bolts and springs, and then respectively fixed to the base 1 or the pitch-axis base 3 by bolts and nuts, and the bolts and springs provide the motor with appropriate restraint force and preload force, and the contact and interaction force between the ceramic column 11 of the motor stator and the motor rotor 8 enables the motor to work normally; the yaw-axis motor 2 controls the relative rotation, i.e. yaw, between the base 1 and the pitch-axis base 3, and the pitch-axis motor 4 controls the relative rotation, i.e. pitch, between the pitch-axis base 3 and the solar panel support structure 6.

[0040] The dual-degree-of-freedom solar orientation drive device further includes two angular displacement sensors 5 for measuring the rotation angle of the rotor of the ultrasonic motor. The two angular displacement sensors are used to measure the angular displacement of the yaw axis and the pitch axis, and provide feedback data for the control system; the needle-shaped contact of the angular displacement sensor is made of brass gold-plated material, and two resistance wires with circular cross-sections are arranged in parallel, and the contact slides therein, and the pre-pressure applied to the contact comes from the deformation of the cantilever beam structure above the contact.

[0041] The solar panel support structure 6 is connected to the entire device through bolts, and the solar panel is fixed to the dual-degree-of-freedom sun-oriented drive device through the cooperation of bolts and nuts to transmit the movement of two degrees of freedom. The solar panel support structure consists of a solar panel clamp and a solar panel support. The solar panel clamp has two parts, the lower part is mainly in the shape of a rectangular parallelepiped with four through holes, and the upper part is a complex geometric body composed of multiple circles with three through holes for clamping the solar panel. The solar panel support has a main shape of a thin shell truncated cone with six isosceles trapezoidal weight-reducing holes. Four through holes are provided on the upper side, which can be connected to the solar panel clamp through ordinary bolts. The inner side of the lower annular boss 1 is glued to the outer side of the bearing outer ring, and the lower annular boss 2 is glued to the upper side of the bearing outer ring, which plays an axial positioning role.

[0042] The axes of the rotors of the two ultrasonic motors are orthogonal, thereby providing yaw rotation and pitch rotation respectively. The method of directly mounting the pitch axis base on the rotor of the yaw axis motor avoids the addition of additional transmission components, making the drive device more compact and smaller in size to the greatest extent.

[0043] The base 1, the pitch axis base 3, and the solar sail panel supporting structure 6 are all made of nylon material suitable for rapid prototyping. At the same time, unnecessary parts of the base 1 and the pitch axis base 3 are hollowed out to minimize the overall mass of the drive device.

[0044] The appearance features of the base 1 are: the main shape is an octagonal plate with four through holes drilled for connecting to the inside of the star body, a first boss is provided on the base 1, the pitch axis base 3 is rotatably connected to the first boss through a bearing, and a gap is left between the pitch axis base 3 and the base 1 to prevent friction.

[0045] Similarly, a second boss is provided on the pitch axis base 3, and the solar sail panel supporting structure 6 is rotatably connected to the second boss via a bearing, and a gap is also left between the pitch axis base 3 and the solar sail panel supporting structure 6, so as to prevent friction.

[0046] Specifically, the appearance characteristics of the pitch axis base 3 are as follows: it is mainly composed of a cylinder and a rectangular block with rounded corners, the cylindrical part is used to connect with the yaw axis bearing, and the rectangular block part is used to connect with the pitch axis bearing.

[0047] The invention can be applied in the field of aerospace, using ultrasonic motors made of piezoelectric ceramic-carbon fiber composite materials to drive solar panels of Pina satellites, giving full play to the advantages of long-term low-speed operation of ultrasonic motors and light weight of carbon fiber composite materials.

[0048] There are many specific implementation ways of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A dual-degree-of-freedom sun-orientation drive device for a Pina satellite solar panel, characterized in that: The dual-degree-of-freedom solar orientation drive device comprises a base (1) for connecting to a Pina satellite, a solar panel support structure (6) for connecting to a solar panel, and a pitch axis base (3) connected therebetween, wherein the pitch axis base (3) is rotatably connected to the base (1), and the solar panel support structure (6) is rotatably connected to the pitch axis base (3); The dual-degree-of-freedom solar orientation drive device further comprises two ultrasonic motors, the two ultrasonic motors being respectively a yaw axis motor (2) and a pitch axis motor (4); the stator of the yaw axis motor (2) is connected to the base (1), and the rotor of the yaw axis motor (2) is connected to the pitch axis base (3); the stator of the pitch axis motor (4) is connected to the pitch axis base (3), and the rotor of the pitch axis motor (4) is connected to the solar sail panel support structure (6); The ultrasonic motor comprises a motor stator (7) and a motor rotor (8); the motor stator (7) comprises a motor body (10), a ceramic column (11) and a pair of support seats; The motor body (10) in the motor stator (7) is made of a piezoelectric material-carbon fiber composite material; The support seat comprises an L-shaped fixing seat, a guide bolt and a spring, the fixing seat is fixedly connected to the base (1) or the pitch axis base (3), the guide bolt is threadedly connected to the fixing seat, and the spring is sleeved on the guide bolt; The motor body (10) is disposed between a pair of support seats, and guide sliders (9) are fixedly connected to both sides of the motor body (10), the guide sliders (9) are loosely sleeved on the guide bolts, and the spring is located between the guide slider (9) and the fixed seat, providing a restraining force and a pre-tightening force for the motor body (10) through the guide bolts and the spring; The motor rotor (8) is fixedly connected to the pitch axis base (3) or the solar sail panel support structure (6); A groove parallel to the axial direction of the motor rotor (8) is provided on a surface of the motor body (10) on one side facing the motor rotor (8); the ceramic column (11) is installed in the groove and contacts the motor rotor (8); the motor rotor (8) rotates through contact and interaction force between the ceramic column (11) in the motor stator (7) and the motor rotor (8).

2. A dual-degree-of-freedom sun-orientation drive device for a Pina satellite solar panel according to claim 1, characterized in that: The dual-degree-of-freedom solar orientation drive device further comprises two angular displacement sensors (5) for measuring the rotation angle of the rotor of the ultrasonic motor.

3. A dual-degree-of-freedom sun-orientation drive device for a Pina satellite solar panel according to claim 1, characterized in that: The axes of the rotors of the two ultrasonic motors are orthogonal.

4. A dual-degree-of-freedom sun-orientation drive device for a Pina satellite solar panel according to claim 1, characterized in that: The base (1), the pitch axis base (3), and the solar sail panel support structure (6) are all made of nylon material. At the same time, the base (1) and the pitch axis base (3) are hollowed out.

5. The dual-degree-of-freedom sun-orientation drive device for a Pina satellite solar panel according to claim 1, characterized in that: The base (1) is provided with a first boss, the pitch axis base (3) is rotatably connected to the first boss via a bearing, and a gap is left between the pitch axis base (3) and the base (1); Similarly, a second boss is provided on the pitch axis base (3), and the solar sail panel support structure (6) is rotatably connected to the second boss via a bearing, and a gap is also left between the pitch axis base (3) and the solar sail panel support structure (6).

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