Induction Windings Magnetic Coupling Element
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Solution Overview
Problem
Conventional induction cooking hearths with multiple individual windings suffer from inhomogeneous temperature distribution, particularly between and around the windings, due to inadequate magnetic field focusing and coupling.
Innovation Solution
The introduction of a magnetic conductive element that magnetically couples adjacent individual windings, increasing overall impedance and reducing the number of turns needed, thereby improving temperature distribution and reducing material and manufacturing costs by optimizing the magnetic coupling between windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple individual windings are arranged side by side in conventional induction cooking hearths, then the heating coverage area is increased, but the temperature distribution becomes inhomogeneous, particularly in the zones between the windings
Solution Approach 1:
A magnetic conductive element is introduced as an intermediary component positioned between adjacent individual windings. This element acts as a magnetic flux guide that couples the magnetic fields of neighboring windings, directing magnetic flux into the previously underheated zones between windings and thereby improving temperature distribution uniformity across the heating surface
2Power
If the number of turns in individual windings is increased to improve magnetic field strength, then the heating effectiveness is improved, but the quantity of copper material and manufacturing cost increase
Solution Approach 1:
The magnetic conductive element merges the magnetic field generation function across multiple windings by providing a shared magnetic flux path. This allows the system to achieve the required magnetic field strength through more efficient flux utilization rather than simply increasing the number of turns in each individual winding, thereby reducing copper material quantity while maintaining heating effectiveness
3Power
If the number of turns in individual windings is increased to improve impedance, then the magnetic field strength is improved, but the heat losses in the windings increase due to longer copper wire length
Solution Approach 1:
The magnetic conductive element serves as a mediator that enhances the magnetic coupling between windings, increasing the overall system impedance through mutual inductance effects rather than through increased self-inductance of individual windings. This approach achieves the required impedance level while maintaining shorter copper wire lengths and reducing resistive heat losses
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 solution enhances temperature uniformity in cooking vessels by generating additional induced currents at the magnetic coupling points, while minimizing copper usage and heat losses, thus improving the efficiency and cost-effectiveness of the induction cooking process.
Implementation Method 1
magnetic conductive elements extending under the winding and having the function of focusing the magnetic field generated by the individual winding towards a container to be heated
Implementation Method 2
The circulation of this current in the individual winding has the effect of creating a magnetic field. The circulation of this magnetic field in a culinary container placed on a support above the inductor causes the circulation of induced currents in the ferromagnetic bottom of this container
Implementation Method 3
These induced currents have the effect of directly heating the cooking vessel
Data Source
Figure 1~3
Figure 4~7
Figure 8a~9b
AI summary
The invention relates to an induction device for an induction heating plate (5), which is adapted in such a way as to be arranged beneath a vitroceramic plate and comprises at least first and second individual electroconductive windings (3A et 3B) which are arranged next to each other in a first plane. Said device comprises a magnetic conductive element (6) forming a coupling means which extends beneath the first individual winding (3A) and the second individual winding (3B) in such a way as to magnetically couple said first and second individual windings (3A et 3B). The invention can be especially used in an induction cooking surface.