A magnetic circuit structure of a multi-ring magnetically permeable pillar Hall thruster

Abstract

A magnetic circuit structure of a Hall thruster with multi-ring magnetic pillars, including a bottom plate, an inner iron core, a magnetic pole piece, N groups of channel magnetic shield rings and several magnetic pillars; the inner iron core and the N group of channel magnetic shield rings consist of It is set concentrically to the outside, and between the magnetic shield rings of two adjacent channels and on the outside of the magnetic shield rings of the Nth group of channels, there are a plurality of magnetically conductive columns evenly arranged along the circumferential direction to form an equivalent magnetically conductive ring. The inner iron core, N A group of channel magnetic shield rings and a plurality of magnetically conductive columns are connected to the bottom plate, and coils are wound around the inner iron core and the magnetically conductive columns. Each group of channel magnetic shield rings is a double-ring structure with an open top. Vertical, the top of the inner iron core and the top of each magnetic conduction ring are connected with magnetic pole pieces, wherein the inner iron core and the magnetic pole pieces arranged on the top of the inner iron core are both hollow structures; the through holes on each magnetic pole piece are connected with the corresponding guide The magnetic columns are arranged at intervals. The invention can effectively improve the heat dissipation capacity of the magnetic circuit of the multi-ring Hall thruster, thereby reducing the temperature of the magnetic circuit, and improving reliability and discharge stability.

Description

technical field [0001] The invention relates to a Hall thruster, in particular to a magnetic circuit structure of a Hall thruster with multi-ring magnetic conducting columns. Background technique [0002] The Hall thruster is a propulsion device that uses orthogonal electromagnetic fields to ionize and accelerate working fluid. It has the advanced features of space propulsion devices such as simple structure, high specific impulse, high efficiency, long life, and good reliability. The traditional Hall thruster has a single-ring discharge chamber, and its power level is generally in the kW range. It is currently widely used in various tasks such as position maintenance and attitude control of spacecraft. It is the electric propulsion device with the highest technological maturity. However, with the proposal of "Moon Base" and "Mars Landing", space missions such as "Earth-Moon", "Earth-Fire" cargo transportation and orbital transfer in the future will require high-thrust power...

AI Technical Summary

Problems solved by technology

However, compared with the traditional single-ring Hall thruster, the concentric multi-ring nested Hall thruster is not mature enough. The specific performance is: there is mutual interference between its adjacent discharge channels, and it is difficult to decouple; multi-channel sharing One cathode, the lack of electrons entering the outer ring leads to poor cathode coupling effect and reduced thruster efficiency; its multi-ring ultra-high power mode requires a super-high-current hollow cathode to maintain discharge, and the emission current demand of the supporting hollow cathode reaches hundreds of amperes, but currently Hundred-ampere ultra-high current hollow cathode takes up a lot of space and technology maturity is insufficient

In addition, the magnetic circuit is a closed chamber structure, which has the problems of serious heat generation and difficult heat dissipation. Especially, the magnetic circuit structure between two adjacent channels is in the high-temperature radiation environment of two adjacent discharge channels, and the problem of difficult heat dissipation is particularly prominent.

Images