Segmented Electromagnetic Coils for Uniform Heating
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Solution Overview
Problem
Existing electromagnetic heating devices in cooking appliances suffer from inadequate effective heating area and heating over-concentration due to eddy-current concentration of the magnetic field, leading to inefficient cooking experiences.
Innovation Solution
The arrangement of multiple first electromagnetic coils on a coil disk, with a second coil between and a third coil surrounding them, enhances magnetic field strength and coverage, forming multiple heating centers and increasing the effective heating area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a circular magnetic field heating coil is used, then the heating appliance has a circular heating area, but the heating area cannot cover the projection area of the appliance and the heating area is smaller than the effective area of the coil surface
Solution Approach 1:
The patent divides the single circular heating coil into multiple segmented coil units arranged in a matrix pattern. This segmentation allows the magnetic field to be distributed across multiple discrete heating zones, enabling the heating area to cover the entire projection area of the appliance while maintaining efficient heat generation through each coil segment.
2Shape
If the heating coil is wound in circle, then the cooking appliance has a circular heating area, but eddy-current concentration occurs leading to heating over-concentration
Solution Approach 1:
By segmenting the continuous circular coil into discrete coil units arranged in a matrix, the patent eliminates the continuous circular path that causes eddy-current concentration. Each segmented coil generates its own localized magnetic field, distributing eddy currents across multiple independent zones and preventing harmful concentration effects while maintaining the overall circular heating area shape.
3Stability of the object's composition
If multiple first electromagnetic coils are distributed and spaced apart, then heating uniformity is improved, but the effective heating area may be reduced
Solution Approach 1:
The patent combines multiple spaced-apart first electromagnetic coils with second electromagnetic coils positioned in the gaps between them. This merging of coil systems creates a continuous magnetic field coverage across the entire heating area, ensuring both heating uniformity through distributed coils and sufficient effective heating area through the complementary second coils that fill the spaces between first coils.
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 improves heating uniformity and power by increasing the coupling coefficient between the magnetic field and the cooking appliance, resulting in a larger effective heating area and enhanced cooking performance.
Implementation Method 1
magnetic field heating coil widely used
Implementation Method 2
eddy-current concentration of the magnetic field
Implementation Method 3
heating over-concentration
Data Source
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AI summary
Disclosed are an electromagnetic heating device and a cooking appliance. The electromagnetic heating device includes a coil disk and electromagnetic coils arranged on the coil disk. The electromagnetic coils includes first electromagnetic coils distributed and spaced on the coil disk to correspondingly form multiple magnetic field centers. The problem of heating over-concentration can be solved. And the electromagnetic coils further includes a second electromagnetic coil and/or a third electromagnetic coil. The second electromagnetic coil is arranged in a space area between the first electromagnetic coils, and the third electromagnetic coil is wound around at least two of the first electromagnetic coils. Heating power can be further increased by arranging the second electromagnetic coil and/or the third electromagnetic coil.