Induction Cooking Coil with Variable Winding Density
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Solution Overview
Problem
Induction-type cooking apparatuses are limited in use due to restrictions on the size and position of the working coil, leading to increased power consumption and potential failure if a cooking container is not placed correctly, resulting in inefficient cooking and stress on the power module.
Innovation Solution
A cooking apparatus with a cooking plate and working coils having different winding densities and configurations, allowing for flexible placement of cooking containers and efficient heating across various sizes and positions, including overlapping sub-cooking areas with varying heating capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single working coil with uniform winding density is used, then the coil structure is simple and easy to manufacture, but the cooking apparatus is restricted in use according to the size and position of the working coil
Solution Approach 1:
The working coil is divided into multiple portions with different winding densities. The first portion has a first winding density and the second portion has a second winding density different from the first. This local variation in winding density allows different regions of the coil to serve different cooking needs, enabling flexible placement of cooking containers of various sizes and positions while maintaining manufacturability.
Solution Approach 2:
The working coil is segmented into multiple portions along its length, where each portion has a distinct winding density. This segmentation allows the coil to be designed with specific functional zones - for example, higher winding density in regions requiring stronger magnetic fields and lower density in regions where gentler heating is needed or where cooking containers of different sizes will be placed.
2Device complexity
If the working coil size and position are fixed, then the coil structure is simple, but power consumption increases and stress on the power module increases when cooking containers are not placed correctly
Solution Approach 1:
By creating portions with different winding densities, the coil can efficiently adapt to various cooking container placements. When a cooking container is placed on a portion with higher winding density, the stronger magnetic field ensures effective heating, preventing the power module from operating under excessive stress. This local optimization maintains simple overall coil structure while improving reliability.
3Device complexity
If a single working coil is used, then the device structure is simple, but cooking efficiency is reduced when cooking containers of various sizes need to be accommodated
Solution Approach 1:
The working coil incorporates portions with different winding densities optimized for different cooking scenarios. Portions with higher winding density provide stronger heating for smaller containers or specific cooking tasks, while portions with lower winding density are suitable for larger containers. This allows the single coil structure to maintain high cooking efficiency across various cooking container sizes without increasing device complexity.
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
Enables cooking containers of various sizes to be placed at desired positions, improving cooking efficiency and preventing damage to the power module by optimizing the heating process through the use of coils with distinct winding densities and configurations.
Implementation Method 1
The induction heating device heats food using heat generated by eddy current loss and hysteresis loss caused in a cooking container disposed within an alternating magnetic field
Implementation Method 2
The induction heating device heats food using heat generated by eddy current loss and hysteresis loss caused in a cooking container disposed within an alternating magnetic field
Implementation Method 3
at least one working coil disposed under the cooking plate to inductively heat the cooking container
Data Source
AI summary
A cooking apparatus performing cooking with a cooking container disposed at any desired position on a cooking plate, and a heating device thereof. The cooking apparatus includes a cooking plate to receive a cooking container thereon, and at least one working coil disposed under the cooking plate to heat the cooking container, the at least one working coil including a first portion and a second portion having a different winding structure of a conducting wire which forms the working coil so that a winding density of the conducting wire at one of the first portion and the second portion is relatively higher than the other of the first portion and the second portion.