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Optimization, Test and Diagnostics of Miniaturized Hall Thrusters
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Stabilizing low-frequency oscillation with two-stage filter in Hall thrusters.

Liqiu Wei1, Liang Han1, Yongjie Ding1

  • 1Harbin Institute of Technology, Harbin, Hei Longjiang 150001, People's Republic of China.

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Summary

A novel two-stage filter effectively suppresses low-frequency oscillations in Hall thrusters. This filter reduces electromagnetic interference and controls discharge current fluctuations, improving thruster performance.

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Area of Science:

  • Plasma Physics
  • Electric Propulsion
  • Spacecraft Engineering

Background:

  • Low-frequency discharge current oscillations are a common issue in Hall thrusters.
  • Existing RLC network filters primarily reduce electromagnetic interference (EMI) returning to the power processing unit.
  • Recent studies highlight the potential of filters to actively control oscillations, not just passively filter EMI.

Purpose of the Study:

  • To propose and design a two-stage filter capable of both EMI filtering and discharge current oscillation control.
  • To investigate the effectiveness of this novel filter design in Hall thruster applications.
  • To provide detailed design methodologies for the proposed two-stage filter.

Main Methods:

  • Development of a two-stage filter integrating EMI filtering and active oscillation control functionalities.
  • Experimental verification of the filter's performance using various capacitance and inductance configurations.
  • Analysis of discharge current oscillation attenuation and standard deviation reduction.

Main Results:

  • The proposed two-stage filter successfully attenuated current oscillations by a factor of 10.
  • The control stage of the filter significantly reduced the standard deviation of low-frequency oscillations from 3 A to 1 A.
  • Experimental results validated the design and effectiveness of the two-stage filter.

Conclusions:

  • A two-stage filter design effectively addresses both EMI filtering and discharge current control in Hall thrusters.
  • This integrated approach offers a more comprehensive solution for managing oscillations compared to traditional filters.
  • The demonstrated performance improvements suggest practical applications for enhanced Hall thruster stability and reliability.