Cross-Field Inductor Layout for Uniform Sheet Edge Heating
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Solution Overview
Problem
Existing transverse field induction heating apparatuses often result in overheating of sheet edges due to uneven power distribution and induction of parasitic circular currents.
Innovation Solution
Dividing each inductor into two adjacently arranged partial induction loops series-connected and fed in opposite directions, with each loop having a hammer head geometry and parallel supply and return conductors, to achieve controlled edge heating and suppress parasitic currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single inductor is used for heating, then the structure is simple, but sheet edges overheat due to uneven power distribution
Solution Approach 1:
Each inductor is divided into two adjacently arranged partial induction loops that are series-connected and fed in opposite directions. This segmentation allows different regions of the sheet to receive different power densities, with the region between the loops receiving less power to prevent edge overheating while maintaining simple overall structure
Solution Approach 2:
The patent applies different current directions to different regions by dividing the inductor into partial loops fed in opposite directions. This creates localized heating zones where the center region receives higher power density and edge regions receive reduced power density, achieving uniform temperature distribution across the sheet
2Temperature
If inductors are arranged to provide even heating, then heating uniformity improves, but parasitic circular currents are induced in drive rollers
Solution Approach 1:
The patent prevents parasitic circular currents before they can form by designing the inductor configuration to compensate magnetic fields in the head region. The series-connected partial loops fed in opposite directions create opposing magnetic fields that cancel each other out, eliminating the condition that would induce circular currents in the drive rollers
3Productivity
If maximum power density is applied to the sheet, then heating efficiency increases, but sheet edges overheat
Solution Approach 1:
The inductor is segmented into partial loops that create zones of different power density. The series connection with opposite current directions ensures that maximum power density is applied to the center region for efficient heating, while edge regions receive reduced power density to prevent overheating
Solution Approach 2:
Different regions of the sheet receive locally optimized power density through the divided inductor configuration. The center region receives high power density for efficient heating, while edge regions receive lower power density, achieving both high productivity and temperature control
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 achieves high surface power density with minimal edge overheating and prevents circular current induction, ensuring even heating and reducing the risk of arcing between the sheet and drive rollers.
Implementation Method 1
transverse field induction heating apparatus for the inductive heating of sheet metal
Implementation Method 2
a circular current from being induced over the non-insulated drive rollers for the sheet
Implementation Method 3
the divided current in both loops is oriented in opposite directions, the resulting magnetic fields are compensated in the head region of the inductor
Data Source
AI summary
A transverse field induction heating apparatus for the inductive heating of sheet metal in a rolling mill includes an upper inductor and a lower inductor. The upper inductor includes two adjacently positioned upper partial induction loops which are series-connected and fed an electrical current in opposite directions. The lower inductor includes two adjacently positioned lower partial induction loops which are series-connected and fed an electrical current in opposite directions. The electrical current in both partial induction loops is oriented in an opposing direction. Each of the upper and lower partial induction loop is structured to be moved individually perpendicular to a sheet axis and includes a rounded head positioned adjacent to each other such that the rounded head is shaped as a hammer head.