Magnetic circuit structure of high-excitation-performance post-loading magnetic field Hall thruster and design method

Abstract

The invention discloses a magnetic circuit structure of a high-excitation-performance post-loading magnetic field Hall thruster and a design method, the structure comprises an inner magnetic pole, an inner iron core, an inner coil, an inner magnetic screen, a bottom plate, a shell, an outer coil, an outer magnetic screen, an outer magnetic pole, an inner permanent magnet and an outer permanent magnet, the inner permanent magnet is fixed on the upper surface of the inner magnetic pole, and the outer permanent magnet is fixed on the upper surface of the outer magnetic pole; according to the method, a magnetic circuit structure is assembled, magnetic fields of an inner permanent magnet and an outer permanent magnet are in the axial direction of the thruster and are opposite in direction, a post-loading magnetic field can be provided in the fixed magnetic line direction of the permanent magnets, a main magnetic field with a certain post-loading degree is formed through permanent magnet excitation, and an adjusting magnetic field with the same post-loading degree is formed through coil excitation. The maximum magnetic field intensity in the channel is adjusted through coil excitation. The magnetic saturation degree in a magnetic circuit can be reduced, and the design freedom degree of the post-loading magnetic field Hall thruster is increased.

Description

technical field [0001] The invention relates to a Hall thruster, in particular to a magnetic circuit structure and a design method of a Hall thruster with a high excitation performance after loading a magnetic field. Background technique [0002] Hall thruster is an electric propulsion device that uses orthogonal electromagnetic field to ionize and accelerate working medium gas to generate thrust, and is mainly used in the field of aerospace propulsion. The Hall thruster forms an orthogonal electromagnetic field inside the channel, and the electrons emitted by the cathode are bound by the magnetic field in the process of reaching the anode at the bottom of the channel, and make a Larmor gyration around the magnetic field line. The propellant is injected from the bottom of the channel, and neutral atoms and electrons collide and ionize in the channel, generating a large number of ions and electrons. The ions are ejected at high speed under the action of the axial electric fi...

AI Technical Summary

Problems solved by technology

[0007] However, in the traditional Hall thruster, the degree of postloading of the magnetic field is determined by the flux leakage gap between the magnetic poles and the magnetic screen. To increase the degree of afterloading, the height of the magnetic screen must be increased to reduce the leakage between the two. Magnetic gap, forcing the magnetic lines of force to concentrate on the outside of the channel exit

On the one hand, under the same excitation current, the magnetic field in the channel will decrease, which reduces the excitation efficiency and increases the excitation loss; on the other hand, a large number of magnetic lines of force gather in the magnetic circuit, resulting in aggravated magnetic saturation in the magnetic circuit structure

The two restrict each other, which greatly restricts the size of the thruster and the peak value of the magnetic field strength, resulting in a reduction in the design freedom of the Hall thruster

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