Magnetic Flux Concentration Technology Based on Soft Magnets and Superconductors
Abstract
:1. Introduction
2. Simulation and Results
2.1. Soft Magnetic Flux Concentrators
2.1.1. Principles and Simulation Model
2.1.2. Simulation Results
2.2. Superconducting FC
2.2.1. Principle and Simulation Model
2.2.2. Simulation Results
3. Experimental Results and Discussion
4. Conclusions
- 1
- The main factors affecting the magnetic field amplification performance of the soft magnetic FC include permeability, demagnetizing factor, and gap width. First, the magnetic field amplification factor of the soft magnetic FC increases with the addition in permeability and starts to saturate when the permeability exceeds 5000. Secondly, enlarging the aspect ratio of the soft magnetic FC can effectively reduce the demagnetization factor and improve the magnetic field gain factor. Finally, the air gap should be minimized to reduce magnetic leakage. In practical applications, the size and gap width of the soft magnetic FC should be reasonably designed according to the size requirements of the sensor and the magnetic-sensitive element.
- 2
- The main factors affecting the magnetic field amplification performance of the superconducting FC include the effective area, the self-inductance of the superconducting loop, and the width of the constriction. With the external dimensions of the superconducting FC determined, the ratio of the inner to outer radii of the superconducting loop should be set to 1:2, while minimizing the width of the constriction as much as possible. It should be noted that reducing the width of the constriction decreases the magnetic field amplification area and reduces the magnetic field range. In practical applications, the width of the constriction and other parameters should be reasonably designed according to the size requirements of the sensor and the magnetic-sensitive element (e.g., the size of the TMR junction region).
- 3
- At the same size, the superconducting FC exhibits superior magnetic field amplification performance. Additionally, since the superconducting FC operates in a low-temperature environment, the thermal noise of the magnetic-sensitive element (TMR) can be effectively reduced, thereby enhancing magnetic field resolution. However, it is important to note that the superconducting FC requires low-temperature cooling equipment (such as refrigerators or liquid nitrogen). Therefore, in practical applications, the choice of flux concentrator should be made based on the specific application scenarios.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Parameters | Dm1 | Dm2 | Lm | hm1 | hm2 | wm |
---|---|---|---|---|---|---|
Unit (mm) | 20 | 2 | 10 | 1 | 1 | 1 |
Parameters | DS1 | DS2 | hs | ds | ws |
---|---|---|---|---|---|
Unit (mm) | 20 | 10 | 0.001 | 2 | 1 |
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Wu, Y.; Xiao, L.; Han, S.; Chen, J. Magnetic Flux Concentration Technology Based on Soft Magnets and Superconductors. Crystals 2024, 14, 747. https://doi.org/10.3390/cryst14080747
Wu Y, Xiao L, Han S, Chen J. Magnetic Flux Concentration Technology Based on Soft Magnets and Superconductors. Crystals. 2024; 14(8):747. https://doi.org/10.3390/cryst14080747
Chicago/Turabian StyleWu, Yue, Liye Xiao, Siyuan Han, and Jiamin Chen. 2024. "Magnetic Flux Concentration Technology Based on Soft Magnets and Superconductors" Crystals 14, no. 8: 747. https://doi.org/10.3390/cryst14080747