Energy transfer cooking device accessory, method of manufacturing an energy transfer cooking device accessory and cooking device
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Solution Overview
Problem
Existing wireless energy transfer methods for cooking devices face inefficiencies due to the conductive cooking chamber wall, which prevents high-power transfer at high frequencies and requires large coils or thermal insulation, increasing costs and complexity.
Innovation Solution
A plastically deformed metal sheet, such as stainless steel, is used to create a magnetically permeable coupling point between the primary and secondary circuits, allowing for efficient non-resonant inductive power transfer without additional materials, reducing the need for large coils and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If resonant power transfer units with high frequency are used to transfer power through the cooking chamber wall, then wireless power transfer is enabled, but electrical losses increase quadratically and the majority of power remains in the wall
Solution Approach 1:
The invention applies local quality by creating a magnetically permeable coupling point at a specific location on the cooking chamber wall through plastic deformation. This localized treatment area allows magnetic flux to pass through the wall efficiently at that specific point, while the rest of the wall maintains its original properties. The plastically deformed region has altered grain structure that increases magnetic permeability, enabling effective power transfer without treating the entire wall surface.
Solution Approach 2:
The invention changes the magnetic properties parameter of the cooking chamber wall by plastically deforming a localized region. The plastic deformation process alters the microstructure and magnetic characteristics of the metal sheet, transforming it from a state that blocks magnetic flux to one that permits efficient magnetic coupling. This parameter change enables the wall to function as a magnetic flux path at the deformed location.
2Reliability
If non-resonant magnetic power transfer with transformer and common core is used, then good magnetic coupling is achieved, but the cooking chamber wall interrupts the core forming gaps that reduce coupling efficiency
Solution Approach 1:
The invention extracts the magnetic coupling function from the traditional transformer core structure and transfers it to the cooking chamber wall itself. By plastically deforming a localized region of the wall, the invention creates a magnetically permeable path that serves as the coupling medium, eliminating the need for separate core structures that would be interrupted by the wall. The wall becomes an integral part of the magnetic circuit.
Solution Approach 2:
The invention merges the cooking chamber wall with the magnetic coupling function. Instead of having separate components (transformer, core, and wall), the plastically deformed wall region combines the structural wall function with the magnetic flux path function. This integration eliminates gaps and reduces coupling losses by making the wall itself the magnetic coupling medium.
3Adaptability or versatility
If connector plugs are installed inside the cooking chamber to provide electrical power, then removable cooking accessories can be connected, but electrical insulation problems arise under cooking chamber conditions
Solution Approach 1:
The invention replaces the mechanical electrical connection system (cables and plugs) with a wireless electromagnetic power transfer system. By creating a magnetically permeable coupling point in the wall, the invention enables power transfer through magnetic induction without physical electrical contacts penetrating the cooking chamber. This substitution eliminates insulation problems while maintaining the ability to power removable accessories.
4Reliability
If thermal insulation is added to the cooking chamber wall to prevent atmosphere escape and temperature rise, then cooking chamber integrity is maintained, but installation and manufacturing costs increase significantly
Solution Approach 1:
The invention applies local quality by treating only a small localized region of the cooking chamber wall with plastic deformation to create the magnetically permeable coupling point. This localized treatment maintains the overall wall structure and its thermal insulation properties without requiring additional insulation materials or complex modifications to the entire wall assembly, thereby avoiding increased manufacturing costs.
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 enables cost-effective and efficient wireless energy transfer through the cooking chamber wall, reducing electrical losses and manufacturing costs while maintaining hygienic and stable surfaces for easy cleaning.
Implementation Method 1
the plastically deformed metal sheet is arranged between the primary circuit and secondary circuit and forms a magnetically permeable coupling point for the primary circuit and secondary circuit, so that a magnetic flux from the primary circuit to the secondary circuit via the plastically deformed metal sheet is guaranteed
Implementation Method 2
a transformer-like power transfer unit, having a primary circuit and a secondary circuit
Implementation Method 3
the plastically deformed metal sheet has a deformation region which has a locally considerably increased magnetic permeability by comparison with the remainder of the metal sheet in the non-plastically deformed region
Data Source
AI summary
An energy transfer cooking device accessory is described which includes a plastically deformed metal sheet (and a transformer-like power transfer unit which has a primary circuit and a secondary circuit. The plastically deformed metal sheet is arranged between said primary circuit and said secondary circuit. Simultaneously said plastically deformed metal sheet forms a magnetically permeable coupling point for said primary circuit and said secondary circuit, so that a magnetic flux from said primary circuit to said secondary circuit via said plastically deformed metal sheet is guaranteed. Furthermore, a method of manufacturing an energy transfer cooking device accessory and a cooking device are described.