Induction Coil Base Plate Layout for Uniform Hob Heating
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Solution Overview
Problem
Induction coils for induction cooking hobs often result in non-uniform heat distribution due to varying winding concentrations, leading to inefficiencies in heating ferromagnetic materials.
Innovation Solution
The induction coil design incorporates a base plate with conductive and non-conductive portions, where the conductive material reacts to high winding concentrations to reduce magnetic coupling and the non-conductive material, such as mica or slots, maintains coupling at low winding concentrations, ensuring uniform heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the winding arrangement has different winding concentrations to satisfy geometric conditions, then the induction coil can adapt to various shapes and sizes, but the heat distribution becomes non-uniform
Solution Approach 1:
The base plate is divided into different regions with varying properties: conductive portions positioned over high winding concentration areas and non-conductive portions over low winding concentration areas. This local differentiation compensates for the non-uniform magnetic field distribution, ensuring uniform heat generation across the entire heating zone while maintaining geometric adaptability of the winding arrangement.
2Loss of energy
If the base plate is made entirely of conductive material, then the magnetic coupling is reduced in high concentration areas, but the heat distribution remains non-uniform due to lack of compensation in low concentration areas
Solution Approach 1:
The base plate incorporates spatially varying material properties: conductive materials (such as aluminum or copper) are applied only in regions corresponding to high winding concentration areas where magnetic coupling reduction is needed, while non-conductive regions are maintained in low concentration areas to preserve magnetic field strength and coupling, achieving uniform heat distribution across the heating zone.
Solution Approach 2:
The base plate is segmented into multiple functional zones with different electrical conductivity characteristics. This segmentation allows independent optimization of magnetic field interaction in different regions, enabling the system to compensate for non-uniform winding distribution and achieve uniform heating performance.
3Reliability
If the base plate is made entirely of non-conductive material, then the magnetic coupling is preserved, but the coupling cannot be reduced in high concentration areas to achieve uniform heat distribution
Solution Approach 1:
The base plate structure combines both conductive and non-conductive materials in specific spatial arrangements. Non-conductive portions are strategically placed in low winding concentration regions to maintain strong magnetic coupling and field penetration, while conductive portions are placed in high concentration regions to reduce excessive coupling and prevent hot spots, thereby achieving uniform heat distribution while preserving overall magnetic coupling efficiency.
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 achieves uniform heat distribution across ferromagnetic materials by managing magnetic field interactions, enhancing cooking efficiency and consistency.
Implementation Method 1
The conductive portion of the base plate reacts locally to the magnetic field generated by the portion of high winding concentration of the winding arrangement, so that the coupling between the magnetic field and matter being heated by said magnetic field is reduced.
Implementation Method 2
An induction coil is provided for heating up ferromagnetic matter by eddy currents.
Data Source
AI summary
The present invention relates to an induction coil for an induction heating appliance, in particular for an induction cooking hob. The induction coil comprises at least one base plate (10) and at least one winding arrangement (12). The winding arrangement (12) includes at least one portion of high winding concentration (18) and at least one portion of low winding concentration (20). The base plate (10) is arranged above one or more winding arrangements (12). The base plate (10) includes at least one conductive portion (14) and at least one non-conductive portion (16). At least one conductive portion (14) of the base plate (10) is arranged above at least one portion of high winding concentration (18) of the winding arrangement (12). At least one non-conductive portion (16) of the base plate (10) is arranged above at least one portion of low winding concentration (20) of the winding arrangement (12). The conductive portion (14) of the base plate (10) is made by at least one conductive material. The non-conductive portion (16) of the base plate (10) is made by at least one non-conductive material and/or formed by at least one cut-out in the base plate (10). Further, the present invention relates to an induction heating appliance. Moreover, the present invention relates to an induction cooking hob.