Induction Cooking Coil Height Adjustment for Magnetic Field Control
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Solution Overview
Problem
Cooking appliances using the induction heating method face low heating efficiency for non-magnetic vessels and risk of working coil damage due to excessive magnetic field coupling with intermediate heating elements.
Innovation Solution
A cooking appliance with a coil height controller that adjusts the height of the working coil based on the type of vessel, concentrating the magnetic field either on the object or the intermediate heating element to enhance heating efficiency and prevent coil damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working coil is positioned close to the object to be heated to increase heating efficiency of magnetic substance, then heating efficiency is improved, but the working coil is positioned close to the intermediate heating element causing excessive magnetic field coupling and potential coil damage
Solution Approach 1:
The patent implements a movable working coil that can dynamically adjust its height position between different operational states. The coil transitions from a first position (closer to the intermediate heating element) for heating non-magnetic objects to a second position (farther from the intermediate heating element) for heating magnetic objects, allowing the system to optimize performance while avoiding harmful effects in each mode.
2Adaptability or versatility
If an intermediate heating element is added to enable heating of non-magnetic substances, then heating capability for non-magnetic materials is improved, but heating efficiency for magnetic substances decreases due to magnetic field coupling
Solution Approach 1:
The system uses dynamic positioning of the working coil to control magnetic field coupling with the intermediate heating element. When heating magnetic substances, the coil is positioned in the second position to minimize coupling and maximize direct heating efficiency. When heating non-magnetic substances, the coil moves to the first position to enable coupling through the intermediate element, thus achieving versatility without sacrificing efficiency in either mode.
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
Improves heating efficiency for both magnetic and non-magnetic vessels by optimizing magnetic field distribution and reduces the risk of working coil damage by adjusting the coil height and current flow accordingly.
Implementation Method 1
a working coil for generating a magnetic field passing through at least one of the objects to be heated and the intermediate heating element
Implementation Method 2
The induction heating method is a method for heating an object to be heated itself by generating an eddy current in the object to be heated made of a metal component by using magnetic field generated around a coil
Implementation Method 3
by generating an eddy current in the object to be heated made of a metal component by using magnetic field generated around a coil
Data Source
AI summary
A cooking appliance includes a coil height adjustor configured to adjust a height of a working coil or a plurality of working coils located at different height and an inverter configured to control the current flow through the working coil or at least one working coil of the plurality of working coils.