Transverse Flux Induction Heating Shielding Plate
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Solution Overview
Problem
Transverse flux induction heating devices face challenges in achieving uniform temperature distribution across the width of conductive sheets, particularly at the side ends, and are difficult to adapt to changes in sheet width or meandering motion, leading to uneven heating patterns.
Innovation Solution
The introduction of a shielding plate with protruded portions that form a closed loop, allowing eddy currents to flow along the edges and reduce temperature differences by canceling out main magnetic flux-induced currents, and optionally housing non-conductive soft magnetic materials within the depressed portions to enhance magnetic fields and current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a plain shielding plate is provided between the coil and both side ends of the conductive sheet, then the eddy current distribution is modified, but the eddy current density becomes large at both side ends due to current confinement, resulting in overheating and poor temperature distribution smoothness
Solution Approach 1:
The shielding plate is segmented by providing recessed portions at both side ends, dividing the plate into different functional zones. The recessed portions create localized regions where eddy currents can circulate within the shielding plate itself, preventing current confinement at the sheet edges while maintaining shielding effectiveness in the central heating zone.
Solution Approach 2:
The shielding plate has non-uniform structure with recessed portions only at the side ends, while the central portion remains flat. This local modification allows eddy currents to be redirected into the recessed regions at the edges, creating different current flow patterns in different zones of the shielding plate, thereby preventing side end overheating without affecting central heating performance.
2Adaptability or versatility
If the sheet width of the conductive sheet is changed, then different heating patterns are required, but the coil must be reset depending on the sheet width, requiring a complex moving mechanism
Solution Approach 1:
The shielding plate is designed with recessed portions that can be independently adjusted in position and depth. This segmentation allows the shielding effect to be optimized for different sheet widths by adjusting only the shielding plate parameters, while the coil remains stationary, eliminating the need for complex coil moving mechanisms.
3Temperature
If the conductive sheet moves in a meandering manner, then the temperature distribution uniformity in the width direction deteriorates
Solution Approach 1:
The recessed portions are strategically positioned at the side ends of the shielding plate where meandering-induced temperature variations are most problematic. By creating localized eddy current paths in these recessed regions, the shielding plate compensates for position variations, maintaining stable temperature distribution even when the sheet moves meanderingly.
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 configuration significantly reduces temperature unevenness across the width of the conductive sheet and minimizes changes in temperature distribution when the sheet meanders, ensuring more uniform heating and improved adaptability to varying sheet widths.
Implementation Method 1
The induction heating device generates Joule heat based on an eddy current which is induced in the conductive sheet by an alternating magnetic field (an alternating-current magnetic field) generated from a coil
Implementation Method 2
The induction heating device generates Joule heat based on an eddy current which is induced in the conductive sheet
Implementation Method 3
a movable plain shielding plate made of a non-magnetic metal is provided between a coil and each of both side ends of a conductive sheet of a heating target
Implementation Method 4
a shielding plate having a width equal to or larger than that of a magnetic pole comprising plural magnetic segments in an electromagnet, formed movably inward and outward in the carrying direction of a thin plate between the magnetic pole and the thin plate, and formed of a non-magnetic metal for adjusting the magnetic field from the magnetic pole
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3
AI summary
The transverse flux induction heating device allows an alternating magnetic field to intersect the sheet face of a conductive sheet which is conveyed in one direction, thereby inductively heating the conductive sheet. The transverse flux induction heating device includes a heating coil disposed such that a coil face faces the sheet face of the conductive sheet; a core around which the heating coil is coiled; and a shielding plate formed of a conductor and disposed between the core and a side end portion in a direction perpendicular to the conveyance direction of the conductive sheet, wherein the shielding plate has a protruded portion, and the side surface of the protruded portion represents a closed loop when viewed from a direction perpendicular to the coil face.