Hall Thruster Magnetic Pole Structure for Uniform Field Distribution
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Solution Overview
Problem
Existing Hall thruster magnetic circuit structures face issues with insufficient magnetic conductivity, magnetic saturation, and non-uniform magnetic field distribution, leading to performance limitations and heat dissipation challenges.
Innovation Solution
A magnetic pole structure featuring wide-envelope outer magnetic poles, a pagoda-shaped inner magnetic pole, and a magnetic bridge, which provides a semi-open design with improved magnetic flux distribution, enhanced heat dissipation, and reduced thermal load, ensuring magnetic conductivity remains above the Curie temperature threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If discrete outer magnetic poles are used, then the structure is simple, but the magnetic flux area is reduced leading to insufficient magnetic conductivity
Solution Approach 1:
The outer magnetic pole is divided into multiple discrete components arranged circumferentially, allowing the magnetic flux to be distributed across multiple segments rather than a single continuous structure. This segmentation increases the total magnetic flux area while maintaining structural simplicity.
Solution Approach 2:
The magnetic pole structure extends into the circumferential dimension with multiple discrete poles arranged around the discharge channel. This dimensional arrangement increases the magnetic flux area by utilizing the circumferential space, resolving the contradiction between structural simplicity and magnetic conductivity.
2Productivity
If the Hall thruster is extended, then the thrust capability increases, but the risk of magnetic saturation increases
Solution Approach 1:
The magnetic pole structure parameters are optimized by adjusting the number, size, and spacing of discrete outer magnetic poles. This allows the magnetic flux distribution to be tailored for extended thruster configurations, increasing thrust capability while preventing magnetic saturation through proper parameter selection.
3Device complexity
If the magnetic field distribution is non-uniform, then the magnetic circuit is simpler, but the electron distribution and ionization rate become non-uniform affecting performance
Solution Approach 1:
Each discrete outer magnetic pole is designed with specific local characteristics including optimized spacing, size, and positioning. This local quality optimization ensures that the magnetic field contribution from each pole creates a collectively uniform magnetic field distribution across the discharge channel, improving electron distribution and ionization rate uniformity.
4Temperature
If the outer magnetic pole structure is wide-envelope, then the heat dissipation capacity improves, but the magnetic flux area may be reduced
Solution Approach 1:
The wide-envelope outer magnetic pole is segmented into multiple discrete circumferential components with spacing between them. This segmentation creates open spaces that facilitate heat dissipation through convection and radiation, while the individual pole segments maintain sufficient magnetic flux area for effective magnetic conductivity.
Solution Approach 2:
The discrete circumferential arrangement of outer magnetic poles creates a porous-like structure with gaps between poles. This porous configuration enhances heat dissipation capacity by allowing thermal convection and radiation through the openings, while preserving the magnetic flux area of the individual pole structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves uniform magnetic field distribution, improved heat dissipation, increased magnetic conductivity, and reduced thermal load, resulting in enhanced performance and efficiency of the Hall thruster, including improved ionization and specific impulse.
Implementation Method 1
the area of the magnetic flux is reduced, leading to insufficient magnetic conductivity
Implementation Method 2
The heat of the inner magnetic pole structure is mainly transferred to the outer magnetic pole, the top plate, and the bottom plate through conduction
Implementation Method 3
the semi-open structure greatly improves the heat dissipation capacity of the Hall thruster
Data Source
AI summary
A magnetic pole structure for a Hall thruster is provided. The magnetic pole structure includes: multiple wide-envelope outer magnetic pole components, a magnetic bridge, a pagoda-shaped inner magnetic pole component, a top plate, and a bottom plate, where the multiple wide-envelope outer magnetic pole components are arranged on an outer edge of the Hall thruster, symmetrical about the pagoda-shaped inner magnetic pole component, and enclose a semi-open structure; the magnetic bridge is located between each of the wide-envelope outer magnetic pole components and the pagoda-shaped inner magnetic pole component; the bottom plate is attached to a bottom part of each of the wide-envelope outer magnetic pole components and a bottom part of the pagoda-shaped inner magnetic pole component; and the top plate is attached to an upper part of each of the wide-envelope outer magnetic pole components.