Segmented Magnetic Shield Layout for Cooler Induction Equipment
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Solution Overview
Problem
Conventional stationary induction apparatuses experience heating issues due to eddy currents produced by leakage flux in the electromagnetic steel plates, leading to increased temperature.
Innovation Solution
A stationary induction apparatus design featuring a core, winding, and magnetic shields with a nonmagnetic support and fixing portions, where the magnetic shields are aligned with gaps to shorten the eddy current path and prevent leakage flux from passing through the support, thereby reducing heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic shields are made with continuous electromagnetic steel plates, then magnetic shielding effectiveness is improved, but eddy current heating increases
Solution Approach 1:
The magnetic shield is segmented into multiple electromagnetic steel plates stacked in the axial direction with insulating material layers between them. This segmentation breaks the continuous eddy current path into shorter segments, reducing eddy current heating while maintaining magnetic shielding effectiveness through the cumulative effect of multiple plates.
Solution Approach 2:
Insulating material layers are selectively placed between adjacent electromagnetic steel plates at specific locations where eddy currents are generated. This local application of insulating material interrupts eddy current paths without compromising the overall magnetic shielding function of the shield structure.
2Volume of moving object
If magnetic shields are positioned close to the support, then space utilization is improved, but leakage flux passes through the support causing heating
Solution Approach 1:
An insulating material layer is introduced as an intermediary between the magnetic shield and the support structure. This intermediary prevents leakage flux from directly passing through the support, thereby reducing support heating while allowing the magnetic shield to maintain its protective function.
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 design effectively suppresses heating in both the electromagnetic steel plates and the support, leading to a reduced temperature increase in the apparatus.
Implementation Method 1
each of the magnetic shields is formed with a plurality of electromagnetic steel plates stacked in a direction vertical to each of the axial direction and the normal direction to the shield support surface
Implementation Method 2
eddy current is produced by leakage flux incident from the stacking direction of the electromagnetic steel plates that constitute the magnetic shield
Data Source
AI summary
A plurality of magnetic shields are arranged to be aligned in an axial direction with a gap there between. Each of a plurality of magnetic shields is formed with a plurality of electromagnetic steel plates stacked in a direction vertical to each of the axial direction and a normal direction to a shield support surface. The shortest spacing distance between each of a plurality of magnetic shields and a support is twice or more the length of the gap between magnetic shields adjacent to each other in a plurality of magnetic shields.