Segmented Ferromagnetic Shielding for High-Power Inductor Thermal Management
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Solution Overview
Problem
Existing electromagnetic shielding technologies for high-power and high-frequency induction systems face challenges such as excessive thermal losses, mass, and size issues, as well as difficulties in integration and maintenance, particularly in environments with high ionizing radiation and complex geometries, leading to inefficiencies and non-uniform heating.
Innovation Solution
A shielded electromagnetic inductor design featuring ferromagnetic columns separated by insulating spacings, with a conductive envelope, reduces thermal losses and maintains electrical parameter consistency, allowing for compact, lightweight shielding that can be integrated into existing systems without significant modifications, using soft ferrites and adaptive parts for efficient cooling and mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional field concentrators (laminated iron sheets or solid ferromagnetic parts) are used for high-frequency applications, then magnetic field confinement is improved, but thermal losses become excessive and the device mass and size increase significantly
Solution Approach 1:
The field concentrator is divided into multiple discrete ferromagnetic elements (plates, bars, or blocks) arranged in a specific pattern around the inductor, rather than using a continuous solid ferromagnetic structure. This segmentation reduces the volume of ferromagnetic material, thereby reducing thermal losses while maintaining effective magnetic field confinement through the distributed arrangement of elements.
2Object-affected harmful factors
If solid ferromagnetic parts are used for frequency ranges above 100 kHz, then magnetic field confinement is improved, but manufacturing difficulty increases due to hardness and brittleness
Solution Approach 1:
The invention uses composite structures combining ferromagnetic elements with non-magnetic supports or spacers. The ferromagnetic components can be manufactured separately (taking advantage of their specific properties) and then assembled into the final configuration, avoiding the need to machine complex solid ferromagnetic parts and reducing manufacturing difficulty.
3Object-affected harmful factors
If field concentrators are used to confine magnetic field, then electromagnetic shielding is improved, but the device bulk becomes incompatible with integration constraints
Solution Approach 1:
The field concentrator is divided into multiple discrete ferromagnetic elements (plates, bars, or blocks) arranged in a specific pattern around the inductor, rather than using a continuous solid ferromagnetic structure. This segmentation reduces the volume of ferromagnetic material, thereby reducing mass while maintaining effective magnetic field confinement through the distributed arrangement of elements.
Solution Approach 2:
Ferromagnetic elements are positioned locally at specific locations where magnetic field confinement is most needed, rather than using a uniform continuous structure. This allows the shielding mass to be optimized by placing material only where it provides the most benefit, reducing overall mass while maintaining effectiveness.
4Object-affected harmful factors
If conventional field concentrators are installed near high-power inductors, then magnetic field confinement is improved, but electrical parameter shifts become significant
Solution Approach 1:
The segmented configuration of discrete ferromagnetic elements creates a more distributed and balanced magnetic circuit, reducing concentrated flux paths that cause significant parameter shifts. The segmentation allows for better control of magnetic flux distribution, maintaining more stable electrical parameters under high-power operation.
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 significant reduction in thermal losses and magnetic field leakage, maintaining electrical parameter consistency and allowing for efficient, long-lasting operation in high-frequency and high-power applications, including environments with high radioactivity, with reduced maintenance needs.
Implementation Method 1
said concentrator comprising ferromagnetic columns of which a main direction of elongation coincides with a direction of a main component of magnetic field lines propagated by the inductor
Implementation Method 2
an inductor arranged in front of a load to be heated by electromagnetic induction
Implementation Method 3
using soft ferrites and adaptive parts for efficient cooling
Implementation Method 4
allowing for efficient, long-lasting operation in high-frequency and high-power applications
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The electromagnetic shielding of the inductor comprises a main field-concentrating shielding (12) composed of vertical columns (13), and the columns are composed of ferromagnetic blocks (14) separated by non-magnetic gaps (15) which contribute to increasing the magnetic reluctance in order to strongly reduce the heat losses. The main shielding is supplemented by an outer conductive casing (1) which confines the residual field that has escaped from the main shielding. The shielding is compact, the mass of ferromagnetic material to be used is modest, autonomous cooling of the main shielding is unnecessary and the electromagnetic coupling between the casing and the main shielding reduces or even eliminates the effects on the electrical characteristics of the equipment.