Demagnetization Coil System for Multilayer Shielding
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Solution Overview
Problem
Multilayer shielding apparatuses face challenges in achieving complete demagnetization due to differences in demagnetization current requirements across layers and interference between demagnetization coils, leading to unsaturated or supersaturated shielding bodies and inefficient demagnetization.
Innovation Solution
A demagnetization method using a demagnetization coil system with multiple turns of coils wound on each layer, connected through a power supply module with a controller to apply varying demagnetization currents layer by layer and in different directions, ensuring a closed magnetic flux circuit and controlled demagnetization sequence to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single demagnetization coil winds through all layers of shielding bodies and applies the same demagnetization current to all layers, then the device complexity is reduced, but the demagnetization precision deteriorates because different layers cannot achieve complete demagnetization due to different saturation requirements
Solution Approach 1:
The patent divides the single demagnetization coil into multiple independent demagnetization coils, with each coil wound around a specific layer of shielding bodies. This segmentation allows each coil to be independently controlled with customized demagnetization currents, enabling complete demagnetization of each layer according to its specific saturation requirements while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The patent applies different demagnetization currents to different layers of shielding bodies based on their local characteristics. Each layer receives a customized current magnitude tailored to its specific saturation requirements, ensuring optimal demagnetization precision for each local region rather than using a uniform current approach.
2Productivity
If demagnetization coils in different layers and directions are activated simultaneously, then the demagnetization speed is improved, but the demagnetization precision deteriorates due to mutual interference between coils
Solution Approach 1:
The patent employs periodic sequential activation of demagnetization coils in different layers and directions. Instead of simultaneous activation, each coil is activated in a controlled sequence with appropriate time intervals, eliminating mutual interference while maintaining efficient demagnetization speed through optimized periodic operation cycles.
Solution Approach 2:
The patent applies preliminary demagnetization actions in specific directions and layers before proceeding to others. By preparing and demagnetizing certain layers or directions first, the system establishes a foundation that prevents subsequent interference, ensuring precise demagnetization throughout the multi-layer structure.
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
This method effectively reduces residual static magnetic fields, improving demagnetization efficiency and supporting applications in biomagnetism, aeromagnetic detection, and geomagnetic anomaly detection by ensuring all layers are demagnetized uniformly and minimizing magnetic field interference.
Implementation Method 1
a demagnetization coil system, which comprises a plurality of turns of demagnetization coils... applying a corresponding demagnetization current to each demagnetization coil... providing corresponding demagnetizing magnetic fields
Data Source
AI summary
A demagnetization method for a multilayer shielding apparatus is provided. In the demagnetization method, the demagnetization is realized on the basis of a demagnetization coil system. The demagnetization coil system includes a plurality of turns of demagnetization coils (2), a plurality of connection wires and a power supply module. The multilayer shielding apparatus includes at least two layers of shielding bodies (1); all the layers of shielding bodies (1) are sleeved layer by layer from inside to outside; a plurality of turns of demagnetization coils (2) are wound on each layer of shielding bodies (1) at intervals; and one half of each turn of demagnetization coils (2) is located inside the wound shielding bodies (1), and the other half is located outside the wound shielding bodies (1). Each demagnetization coil (2) is connected to the power supply module through the corresponding connection wire.