Plasma Thruster Variable Magnetic Field Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current plasma thrusters lack the ability to precisely control the direction and position of thrust, limiting their effectiveness in applications such as space probe and satellite control.
Innovation Solution
A plasma thruster system with a magnet system comprising alternating polarity electromagnets around the thruster axis, allowing for variable magnetic field generation and control by a controller to adjust the thrust direction and position, utilizing a plasma chamber with an anode and cathode to produce an electric field and a propellant inlet for thrust generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional plasma thrusters with fixed magnetic field configuration are used, then the thruster structure is simple, but the ability to control thrust direction and position is limited
Solution Approach 1:
The patent applies dynamics by making the magnetic field configuration adjustable and variable. The magnet system includes multiple magnets (e.g., four magnets with alternating polarity) that can be independently controlled to change the magnetic field distribution in the plasma chamber. This allows the thrust direction and position to be dynamically adjusted during operation, transforming a static system into a controllable one without requiring complete redesign of the thruster architecture.
Solution Approach 2:
The magnet system is segmented into multiple independent magnets rather than using a single fixed magnetic field source. Each magnet can be controlled separately, allowing independent adjustment of magnetic field regions. This segmentation enables precise control over where electrons are confined and where ions are accelerated, thereby controlling thrust direction and position while maintaining a relatively simple overall structure.
2Adaptability or versatility
If the magnetic field is made variable to control thrust direction, then thrust vectoring capability is enhanced, but the device complexity increases
Solution Approach 1:
The variable magnetic field system serves multiple functions: it confines electrons, directs ion acceleration, controls thrust direction, and enables thrust vectoring. By making the magnet system multi-functional, the patent achieves high adaptability without proportionally increasing complexity. The same magnetic field configuration that confines electrons also determines thrust direction, eliminating the need for separate control mechanisms.
Solution Approach 2:
The patent changes magnetic field parameters (strength, distribution, polarity arrangement) to achieve different thrust vectoring capabilities. By adjusting the current in individual electromagnets or the arrangement of permanent magnets, the system can vary the magnetic field configuration to produce thrust in different directions and positions, achieving versatility through parameter adjustment rather than structural complexity.
3Manufacturing precision
If multiple magnets with alternating polarity are used around the thruster axis, then electron confinement and ion acceleration control is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent uses asymmetric magnet arrangements with alternating polarity (e.g., N-S-N-S pattern around the chamber) to create specific magnetic field configurations. This asymmetry in magnet polarity arrangement allows precise control over electron confinement regions and ion acceleration paths, enabling accurate thrust center positioning. The alternating pattern creates magnetic cusps at specific locations that guide plasma flow and determine thrust direction with high precision.
Data Source
Figure 1~2
Figure 3~5b
Figure 6a~7c
AI summary
A plasma thruster comprises a plasma chamber having first and second axial ends, the first of which is open, an anode located at the second axial end, and a cathode. The cathode and anode are arranged to produce an electric field having at least a component in the axial direction of the thruster. A magnet system comprising a plurality of magnets is spaced around the thruster axis, each magnet having its north and south poles spaced around the axis.