CN106401891A - Annular magnetic steel installation structure of ion thruster - Google Patents

Abstract

The invention discloses an annular magnetic steel installation structure of an ion thruster, and belongs to space technologies and the vacuum technical field. The structure comprises a magnetic steel box, a magnetic steel cover, magnetic steel, a pole shoe and a coupling screw assembly. By means of the installation structure, the problems in achievement of large-diameter annular magnetic steel are solved, and the problem that small magnetic steel is in mutual repulsion and is difficult to install when the small magnetic steel is used for achieving the annular magnetic steel is solved; and meanwhile, through the design that a magnetic steel ring is installed on the shell, the requirement of the ion thruster for high temperature using performance of the magnetic steel is reduced.

Description

An ion thruster ring magnet installation structure

technical field

The invention discloses an annular magnetic steel installation structure of an ion thruster, which belongs to the fields of aerospace technology and vacuum technology.

Background technique

As an advanced space propulsion technology, electric propulsion technology has been widely used in various space application fields, including attitude control, north-south position keeping, orbit transfer, atmospheric damping compensation, deep space exploration main propulsion, etc. Especially in deep space exploration missions, electric propulsion technology, with its high specific impulse and long life, can greatly save the amount of propellant carried and increase the payload ratio of the spacecraft, which has strong advantages.

The discharge chamber of the tangential field ion thruster has the advantages of high discharge efficiency, good beam straightness, and weak magnetic induction intensity of the required permanent magnet. Large-diameter ring magnets are not easy to process and magnetize. Usually, the method of splicing small pieces of magnets is used to prepare magnet rings. This method is difficult to arrange closely because of the repulsion between magnets, and assembly is difficult. At the same time, the high temperature generated by the ion thruster puts forward higher requirements on the temperature resistance of the magnetic steel. The invention solves the problem of mutual repulsion in the process of assembling a plurality of small pieces of magnetic steel into ring-shaped magnets and the problem of assembling the ring-shaped magnets on the thruster, and reduces the high-temperature usability requirements of the ion thruster on the magnets .

Contents of the invention

The technical problem to be solved by the present invention is to provide an ion thruster annular magnetic steel installation structure for the problems in the prior art. Arrangement and installation problems, through the design of the installation position of the magnetic steel, the high-temperature usability requirements of the ion thruster for the magnetic steel are reduced.

Adopt following technical scheme for solving technical problem of the present invention:

An ion thruster ring-shaped magnetic steel installation structure, including magnetic steel and pole shoes, the pole shoes and the magnetic steel are placed in the magnetic steel box, and the magnetic steel is attracted by the pole shoes to the magnetic steel when the magnetic steel is assembled into the magnetic steel box The compact arrangement of small pieces of magnetic steel is realized by force, and the magnetic steel box is sealed with a magnetic steel cover, and the magnetic steel box and the magnetic steel cover are installed on the thruster shell through a connecting screw assembly.

The magnetic steel box and the magnetic steel cover are made of duralumin or titanium alloy non-magnetic material.

The material of the pole shoe is precision alloy or electric pure iron magnetic material.

The thickness of the magnetic steel cover near the anode side of the ion thruster is less than 1.5mm.

The outer surface of the magnetic steel cover is plasma-sprayed with aluminum oxide coating.

The distance between the magnetic steel and the anode of the ion thruster is less than 4mm.

The ring magnet installation structure of the ion thruster of the present invention, on the premise of not affecting the strength and distribution of the magnetic field, through the design of the pole shoe, solves the problem of mutual repulsion and tight arrangement in the process of assembling ring magnets from multiple small pieces of magnets. Difficulty in cloth installation. The design of installing the magnetic steel ring on the casing reduces the high temperature usability requirements of the ion thruster on the magnetic steel.

Description of drawings

Figure 1 is a schematic diagram of the installation structure of the ion thruster ring magnet of the present invention;

In the figure: 1-magnetic steel cover, 2-magnetic steel box, 3-magnetic steel, 4-pole shoe, 5-screw assembly, 6-thruster shell, 7-ion thruster anode.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but is not limited thereto.

As shown in the figure, an ion thruster annular magnetic steel installation structure includes a magnetic steel 3, a pole piece 4, the pole piece 4 and the magnetic steel 3 are placed in the magnetic steel box 2, and the pole shoe 4 is installed in the magnetic steel box 2 On the side far away from the anode of the ion thruster, when the magnetic steel 3 is assembled to the magnetic steel box 2, the attraction force of the pole piece 4 to the magnetic steel 3 is used to realize the close arrangement of small pieces of magnetic steel 3, and the box-type installation of the magnetic steel box 2 is used. The structure splices small pieces of magnetic steel 3 into a magnetic steel ring, which solves the problem of mutual repulsion and difficulty in tight arrangement during the process of assembling a ring-shaped magnetic steel from multiple small pieces of magnetic steel. The magnetic steel box 2 is packaged with a magnetic steel cover 3, and the magnetic steel box 2 and the magnetic steel cover 1 are installed on the thruster shell 6 through the connecting screw assembly 5, which solves the assembly problem of the ring magnet on the thruster. Wherein the magnetic steel box 2 and the magnetic steel cover 1 are made of duralumin or titanium alloy non-magnetic material. The pole shoe 4 is made of precision alloy or electric pure iron magnetic material. The thickness of the magnetic steel cover 1 near the anode 7 of the ion thruster is less than 1.5 mm. The outer surface of the magnetic steel cover 1 is plasma-sprayed with aluminum oxide coating, and the aluminum oxide coating not only improves the surface emissivity of the magnetic steel cover, but also ensures the electrical insulation between the magnetic steel cover 1 and the ion thruster anode 7; The distance between the anodes 7 of the ion thruster is less than 4mm.

The ring-shaped magnetic steel 3 assembly of the structure of the present invention is fixed on the thruster shell 6 by the screw assembly 5, and is isolated from the ion thruster anode 7; its installation structure transfers the heat conduction between the ion thruster anode 7 and the magnetic steel 3 by the traditional thruster The heat conduction of the thruster is converted into radiation conduction, and the heat conduction between the thruster shell 6 and the magnetic steel 3 is changed from the radiation conduction of the traditional thruster to the heat conduction. When the temperature of the thruster casing 6 is lower than that of the ion thruster anode 7, the transformation of the conduction mode reduces the high-temperature usability requirements of the ion thruster on the magnetic steel 3 .

The present invention includes but is not limited to the above embodiments, and any equivalent replacement or partial improvement under the principle of the spirit of the present invention will be considered within the protection scope of the present invention.

Claims (6)

1. An ion thruster annular magnetic steel installation structure, characterized in that it includes a magnetic steel (3), a pole piece (4), and the pole piece (4) and the magnetic steel (3) are placed in the magnetic steel box (2 ), when the magnet steel (3) is assembled into the magnet steel box (2), the attraction force of the pole shoe (4) to the magnet steel (3) is used to realize the close arrangement of small pieces of magnet steel (3), and the magnet steel The box (2) is sealed with a magnetic steel cover (3), and the magnetic steel box (2) and the magnetic steel cover (1) are installed on the thruster casing (6) through a connecting screw assembly (5). 2. The annular magnetic steel installation structure of the ion thruster according to claim 1, characterized in that: the magnetic steel box (2) and the magnetic steel cover (1) are made of duralumin or titanium alloy non-magnetic material. 3. An ion thruster annular magnetic steel installation structure according to claim 1 or 2, characterized in that: the pole shoe (4) is made of precision alloy or electric pure iron magnetic material. 4. An ion thruster annular magnetic steel installation structure according to claim 1 or 2, characterized in that the thickness of the magnetic steel cover (1) near the ion thruster anode (7) is less than 1.5 mm. 5. An ion thruster annular magnetic steel installation structure according to claim 1 or 2, characterized in that: the outer surface of the magnetic steel cover (1) is plasma-sprayed with aluminum oxide coating. 6. An ion thruster annular magnetic steel installation structure according to claim 5, characterized in that the distance between the magnetic steel (3) and the ion thruster anode (7) is less than 4mm.