Induction Heating Coil Base with Eddy Current Suppression
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Solution Overview
Problem
Induction heating cooking apparatuses face a temperature rise issue in the supporting base made of nonmagnetic metal due to eddy currents generated during heating of composite materials, such as frying pans with magnetic metal attachments, which affects heating efficiency and safety.
Innovation Solution
The induction heating cooking apparatus incorporates a supporting base with openings under the outer circumferential coil, made of nonmagnetic material, and adjusts the frequency of high-frequency power supplied to the coils to minimize eddy currents, specifically increasing the frequency for the outer coil to reduce temperature rise and improve heating efficiency for composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nonmagnetic metal supporting base is used under the heating coils, then the supporting base provides structural support and electrical insulation, but eddy currents are generated in the supporting base causing temperature rise
Solution Approach 1:
The supporting base is divided into a nonmagnetic base body and a separate magnetic shielding layer. The magnetic shielding layer is segmented into multiple regions: a first shielding layer under the inner circumferential coil and a second shielding layer under the outer circumferential coil, with different material compositions optimized for each heating zone.
Solution Approach 2:
The supporting base uses composite material structure combining nonmagnetic material (for structural support and electrical insulation) with magnetic shielding material (for eddy current suppression). The magnetic shielding layer contains magnetic particles dispersed in a nonmagnetic binder, creating a composite that provides both mechanical support and magnetic field management.
2Productivity
If the frequency of high-frequency power supplied to the outer circumferential coil is increased, then heating efficiency for nonmagnetic bodies is improved, but eddy currents in the supporting base increase causing temperature rise
Solution Approach 1:
Different regions of the supporting base are assigned different material properties: the first magnetic shielding layer under the inner coil uses magnetic shielding material for low-frequency operation, while the second magnetic shielding layer under the outer coil uses material optimized for high-frequency operation to suppress eddy currents at higher frequencies.
Solution Approach 2:
The magnetic shielding layer's material composition is adjusted by changing the concentration and type of magnetic particles in different regions. The second magnetic shielding layer has optimized particle concentration and size distribution to provide effective eddy current suppression at the higher frequencies used by the outer circumferential coil.
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 effectively reduces the temperature rise of the supporting base and enhances heating performance by optimizing the frequency distribution across the coils, ensuring efficient induction heating for composite materials while minimizing heat loss and maintaining safety.
Implementation Method 1
induction heating cooking apparatus including a plurality of heating coils
Implementation Method 2
an eddy current is generated in the supporting base
Implementation Method 3
a plurality of openings formed in part of the supporting base that is located below the outer circumferential coil
Data Source
AI summary
An induction heating cooking apparatus according to an embodiment of the present disclosure includes: a plurality of heating coils each including an inner circumferential coil provided on an innermost circumferential side and an outer circumferential coil provided on an outermost circumferential side; and a supporting base that is provided below the plurality of heating coils, and support the plurality of heating coils. The supporting base is formed in the shape of a flat plate and made of a nonmagnetic body, and has a plurality of openings under the outer circumferential coil.