CN103818566A - Modularization manufacturing method for triaxial magnetic torquer - Google Patents

Abstract

The invention discloses a modular manufacturing method of a three-axis magnetic torque device, which includes step 1, making a hollow coil; step 2, making a first magnetic rod coil and a second magnetic rod coil; step 3, making a first magnetic rod coil A connecting part and a thin plate of a second connecting part, step 4, fixing the first magnetic bar coil and the second magnetic bar coil on the thin plate through the first connecting part and a second connecting part respectively; step 5, fixing the air-core coil It is fixedly connected to the thin plate, and the hollow coil is parallel to the thin plate. The invention solves the difficulty of installation of the traditional magnetic torque device, the complicated debugging and wiring of the magnetic torque device and the attitude control circuit board, and occupies a large space, which is not conducive to the lightweight, miniaturization and modularization of micro-satellites.

Description

A modular manufacturing method for a three-axis magnetic torque device

technical field

The invention relates to the field of micro-satellite attitude control, in particular to a modular manufacturing method of a three-axis magnetic torque device.

Background technique

There are various attitude control methods for micro-satellites, among which the more commonly used method is to use the geomagnetic field to realize satellite attitude control. This method uses a magnetic torque device as an actuator, and uses the principle that a energized coil is subjected to a magnetic force in a magnetic field, and then generates a magnetic torque to realize physical movement. Because the magnetic torque device has the characteristics of light weight, low power consumption, no mass loss, and stable operation, it is widely used in the attitude control system of modern micro-satellites.

In the process of researching the attitude control of micro-satellites, the inventors found that since the traditional magnetic torquer (whether it is a magnetic rod-type magnetic torquer or a hollow magnetic torquer) is single-axis, the modern micro-satellite three In three-axis attitude control, it is necessary to set three independent magnetic torque devices on the microsatellite orthogonally to achieve the purpose of three-axis attitude control. However, such a setting, especially an orthogonal setting, is difficult to install and has low installation accuracy. The debugging and wiring of the magnetic torque device and the attitude control circuit board are complicated and occupy a large space, which is not conducive to the lightweight of the microsatellite. Miniaturization and modularization.

Contents of the invention

The purpose of the present invention is to provide a modular manufacturing method of a three-axis magnetic torque device, which solves the difficulty of installing three independent magnetic torque devices on a micro-satellite in a three-axis attitude control of modern micro-satellites. , the debugging and the wiring of the magnetic torque device and the attitude control circuit board are complicated, and occupy a large space, which is not conducive to the lightweight and miniaturization of micro-satellites.

The technical solution of the present invention is a modular manufacturing method of a three-axis magnetic torque device, comprising the following steps: Step 1, making an air-core coil; Step 2, making a first magnetic rod coil and a second magnetic rod coil; Step 3, making a thin plate with a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively used to fix the first magnetic rod coil and the second magnetic rod coil, and make the first magnetic rod The coil and the second magnetic rod coil are perpendicular to each other; step 4, fix the first magnetic rod coil and the second magnetic rod coil on the thin plate through the first connecting part and a second connecting part respectively; step 5, fix the air-core coil On the thin plate, and the hollow coil is parallel to the thin plate.

Further, the method further includes: setting connection holes in blank spaces of the thin plate.

Further, the hollow coil is rectangular, circular or square.

Further, the first connecting part and the second connecting part are arranged on the edge of the thin plate.

Further, the thin plate is a duralumin thin plate with a thickness of 1 mm.

Further, step 5 is specifically to bond the hollow coil to the thin plate by aviation glue.

Further, the first connecting part is a first card slot; the second connecting part is a second card slot.

The three-axis magnetic torque device designed by the present invention is a modular whole, which includes a hollow magnetic torque device with one axis and a magnetic rod type magnetic torque device with two axes. The module itself contains three orthogonal magnetic torque devices. Torquer, and the installation interface is reserved, the installation position can be designed according to the specific size and shape of the satellite, and it is allowed to be firmly installed by screw thread or rivet, etc. The three-axis magnetic torquer made by this method has the advantages of convenient installation, modular Chemical strength, convenient connection with the control board, etc.

Description of drawings

Fig. 1 is the schematic diagram of triaxial magnetic torque device;

Fig. 2 is the schematic diagram of air-core coil;

Fig. 3 is the schematic diagram of magnetic core;

Fig. 4 is a schematic diagram of a magnetic core wound with a coil.

Detailed ways

A modular manufacturing method for a three-axis magnetic torque device, comprising the steps of:

Step 1. Make a hollow coil;

The air-core coil is rectangular, circular or square. The purpose of the air-core coil is to generate a magnetic field perpendicular to the thin plate after it is energized. Therefore, its shape is not limited to the shapes listed above. As long as the above-mentioned purpose can be achieved, it is under the protection of the present invention. within range.

Step 2, making a first magnetic rod coil and a second magnetic rod coil;

Step 3, making a thin plate with a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively used to fix the first magnetic rod coil and the second magnetic rod coil, and make the first magnetic rod the coil and the second magnetic bar coil are perpendicular to each other;

In this embodiment, the thin plate is a duralumin thin plate with a thickness of 1 mm. In addition, in order to make the layout more compact and reasonable, usually, the first connecting part and the second connecting part are arranged on the edge of the thin plate. More specifically, the first connecting part is a first card slot; the second connecting part is a second card slot. The purpose of the three-axis magnetic torque device is to generate magnetic torque in three directions orthogonal to each other, therefore, the first magnetic bar coil and the second magnetic bar coil are perpendicular to each other is a necessary condition for realizing the above purpose. If the Cartesian coordinate system is established on the plane where the thin plate is located, the air-core coil generates magnetic moments in the Z-axis direction, and the first magnetic rod coil and the second magnetic rod coil generate magnetic moments in the X-axis and Y-axis directions.

Step 4, fixing the first magnetic rod coil and the second magnetic rod coil on the thin plate through the first connecting part and a second connecting part respectively;

Step 5. The air-core coil is fixedly connected to the thin plate, and the air-core coil is parallel to the thin plate. Specifically, the hollow coil is bonded to the thin plate by aviation glue.

In order to install the manufactured three-axis magnetic torque device on the micro-satellite conveniently, a connecting hole can be opened in the blank space of the thin plate to facilitate the connection. Obviously, this connection method is not the main invention point of the present invention. If other connection methods are adopted, for example, the three-axis magnetic torque device is embedded in the micro-satellite by using the card slot provided on the satellite, or the three-axis magnetic torque device is inserted into the micro satellite by glue. The above-mentioned purpose of connection can be achieved by bonding the magnetic torquer to the micro-satellite. Fig. 1 is a schematic diagram of a three-axis magnetic torque device, wherein the mark 1 is a thin plate, the mark 2 is a connecting hole, the mark 3 is a first magnetic rod coil, the mark 4 is a second magnetic rod coil, and the mark 5 is an air-core coil.

The parameters of the air-core coil, the first magnetic rod coil and the second magnetic rod coil are calculated according to the specific requirements of the microsatellite. The specific design and production examples are given below. It should be noted that the following example is only an illustration , air-core coils, first magnetic rod coils, and second magnetic rod coils obtained by other means are all within the protection scope of the present invention. For the convenience of calculation, the first magnetic rod coil and the second magnetic rod coil are made as the same magnetic rod coil:

In the first step, the formulas of the mass, power consumption and magnetic moment of the magnetic torquer derived from the principles of physics are shown below.

First define the symbols to be used as follows: the magnetic moment of the magnetic torque device coil is M, the mass is m, the power consumption is P, the supply voltage is U, the current intensity of the current is I, and the resistance R of the magnetic torque device coil is perpendicular to The unit normal vector n of the coil surface, the average side length of the magnetic torque device coil is a, the volume of the magnetic torque device coil is V, the average area surrounded by the magnetic torque device is A, the resistivity of the wire is ρ, and the density of the wire is is γ, the section radius of the wire is r, the length of the wire used for the magnetic torque device coil is l, and the number of turns of the wire is N.

The magnetic moment of the magnetic torquer coil:

The mass of the magnetic torquer coil:

Power consumption of the magnetic torquer coil:

Before analyzing the magnetic moment of a bar magnet, the following definitions of the symbols to be used are given:

The magnetic moment of the magnetic rod is M, the mass is m, the power consumption is P, the supply voltage is U, the current intensity of the current is I, the resistance of the magnetic rod is R, the length of the magnetic core is l, the radius of the magnetic core is r, and the density of the magnetic core is Y _1. The radius of the entire coil is R _w , the volume of the coil is V, the length of the coil is l _w , the resistivity of the wire is ρ, the radius of the wire is a, the density of the wire is Y ₂ , the number of turns of the wire is N, and the magnetization The vector is M _d .

The power consumption of the magnetic stick:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; u</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; \&rho;N</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; )</span>}$

The magnetic moment of the bar magnet:

$\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&pi;r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; Ni</span>}}{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}$

in, $k_1=\frac{1}{{\mathrm{\&mu;}}_r}+N_d,$ $N_d=\frac{4(\ln \frac{l}{r}-1)}{{\left(\frac{l}{r}\right)}^2-4\ln \left(\frac{l}{r}\right)}$

The quality of the magnetic rod:

m=γ ₂ π ² N(R _w +r)a ² +γ ₁ lπr ²

The second step: give the processing method of the three-axis magnetic torque device

A. For the air-core coil, firstly, according to the design size of the air-core coil, combined with the thickness requirements of the air-core coil, use the duralumin plate to process the corresponding mold, and round the four corners of the mold with a certain size to prevent scratches during winding. To break the wire, open a through hole in the center of the mold that matches the winding machine to fix the mold and the winding machine. Select two splints that are 1-2mm larger than the mold, clamp the two splints on the mold on the winding machine to form a clamping groove, and wind the hollow coil along the groove, as shown in Figure 2.

B. For the magnetic rod coil, firstly select the iron-nickel alloy with larger magnetic permeability, larger saturation magnetic induction intensity and smaller coercive force as the magnetic core material. The length and section radius of the magnetic rod are selected according to the size requirements (this step adopts The parameters of the magnetic core are: the relative permeability is 20000, the saturation magnetic induction is 1.5 Tesla, and the coercive force is 0.15 Oersted). In order to connect the magnetic core and the winding machine, it is necessary to make a frame for connecting the magnetic core and the winding machine. One end of the frame has a threaded hole matching the winding machine to connect the winding machine, and the other end has a hole matching the magnetic core to fasten the magnetic core. At the same time, two 1-2mm splints are placed at both ends of the magnetic core to form a clamping groove, and the magnetic bar coil is wound along the groove, as shown in Figure 3 and Figure 4. Fig. 3 is a schematic diagram of a magnetic core; Fig. 4 is a schematic diagram of a magnetic core wound with a coil.

C. During the winding process, epoxy resin is continuously applied to cure the wire. In order to prevent excess epoxy resin from accumulating on one side of the coil, the excess epoxy resin should be cleaned up in time during the winding process.

The three-axis magnetic torque device designed by the present invention is a modular whole, which includes a hollow magnetic torque device with one axis and a magnetic rod type magnetic torque device with two axes. The module itself contains three orthogonal magnetic torque devices. Torquer, and the installation interface is reserved, the installation position can be designed according to the specific size and shape of the satellite, and it is allowed to be firmly installed by screw thread or rivet, etc. The three-axis magnetic torquer made by this method has the advantages of convenient installation, modular Chemical strength, convenient connection with the control board, etc.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention shall be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (7)

1. A modular manufacturing method of a triaxial magnetic torquer is characterized by comprising the following steps:

step 1, manufacturing an air-core coil;

step 2, manufacturing a first magnetic bar coil and a second magnetic bar coil;

step 3, manufacturing a thin plate with a first connecting part and a second connecting part, wherein the first connecting part and the second connecting part are respectively used for fixing a first magnetic bar coil and a second magnetic bar coil and enabling the first magnetic bar coil and the second magnetic bar coil to be perpendicular to each other;

step 4, fixing the first magnetic bar coil and the second magnetic bar coil on the thin plate through the first connecting part and the second connecting part respectively;

and 5, fixedly connecting the hollow coil on the thin plate, wherein the hollow coil is parallel to the thin plate.

2. The method of claim 1, further comprising: and arranging a connecting hole at the blank of the thin plate.

3. The modular manufacturing method of the triaxial magnetic torquer of claim 2, wherein the air core coil is rectangular, circular or square.

4. The method of claim 3, wherein the first and second connecting portions are disposed at edges of the thin plate.

5. The method of claim 4, wherein the thin plate is a 1 mm thick hard aluminum thin plate.

6. The method of claim 5, wherein step 5 comprises adhering the air-core coil to the sheet by an air adhesive.

7. The modular manufacturing method of any one of the three-axis magnetic torquers of claims 1-6, wherein the first connecting portion is a first slot; the second connecting part is a second clamping groove.

Images