Dielectric Heating Coil Layout for Resonance Without Field Loss
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Solution Overview
Problem
Existing dielectric heating devices face challenges in increasing coil inductance for resonance frequency adjustment without enlarging the coil size, which leads to increased unnecessary electromagnetic fields and reduced heating efficiency.
Innovation Solution
The dielectric heating device designs a coil with a specific linear distance configuration and shape, ensuring the distance between coil ends is equal to or smaller than the distance to its central portion, and optionally incorporates a core with a hollow structure to prevent unnecessary electromagnetic field generation while maintaining heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of windings or cross-sectional area of the coil is increased to adjust resonance frequency, then the inductance of the coil is improved, but the size of the coil and the range of unnecessary electromagnetic field are increased
Solution Approach 1:
The patent introduces a new dimensional constraint by specifying that the linear distance between coil ends (L) must be equal to or smaller than the linear distance from one end to the central portion in the magnetic path direction (Dm/2). This geometric relationship creates a compact coil configuration that achieves high inductance without proportionally increasing the overall coil volume, thus resolving the contradiction between inductance and coil size.
Solution Approach 2:
The patent changes the geometric parameters of the coil by establishing a specific relationship between the linear distance between ends (L) and the magnetic path length (Dm). By controlling these parameters to satisfy L ≤ Dm/2, the patent optimizes the coil's inductance-to-volume ratio, allowing increased inductance while limiting the increase in coil size and unnecessary electromagnetic field range.
2Object-generated harmful factors
If the output of electric power is reduced to prevent unnecessary electromagnetic field, then the harmful electromagnetic field is reduced, but heating efficiency of the object to be heated decreases
Solution Approach 1:
The patent resolves this contradiction by introducing a geometric constraint in the coil configuration (L ≤ Dm/2) that fundamentally changes the electromagnetic field distribution. This dimensional constraint ensures that the coil generates necessary electromagnetic fields for heating while minimizing unnecessary field radiation, allowing high power output without proportionally increasing harmful electromagnetic fields.
Solution Approach 2:
The patent converts the potentially harmful effect of electromagnetic field radiation into a beneficial configuration by using the coil's geometric shape (L ≤ Dm/2) to direct electromagnetic energy primarily toward the heating target. The coil configuration itself becomes the mechanism that distinguishes useful heating fields from harmful radiation, eliminating the need to reduce power output.
3Use of energy by moving object
If the coil size is increased to adjust resonance frequency, then the inductance is improved, but the range of unnecessary electromagnetic field is increased
Solution Approach 1:
The patent applies dimensional analysis by comparing the linear distance between coil ends (L) with the magnetic path length (Dm). By enforcing the relationship L ≤ Dm/2, the patent creates a compact coil geometry that achieves high inductance while confining the electromagnetic field primarily within the coil structure, thus reducing the range of unnecessary electromagnetic field radiation.
Solution Approach 2:
The patent optimizes the coil's geometric parameters by establishing a specific relationship between the linear dimensions (L) and the magnetic path length (Dm). This parameter optimization allows the coil to achieve high inductance values while maintaining a compact size that limits the propagation range of unnecessary electromagnetic fields, resolving the contradiction between inductance and field range.
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 prevents unnecessary electromagnetic field radiation, allowing for increased coil size without reducing power output, thus maintaining or enhancing heating efficiency.
Implementation Method 1
generates an electromagnetic field between the first electrode and the second electrode by applying a high-frequency voltage to the first electrode and the second electrode
Implementation Method 2
heats and dries ink adhering to a recording medium by dielectric heating of the generated electric field
Implementation Method 3
the coil serves to adjust a resonance frequency of the electromagnetic wave generation unit
Data Source
AI summary
A dielectric heating device includes a first electrode and a second electrode that face an object to be heated and to which an AC voltage is applied, and a coil that is electrically coupled in series to the first electrode. A linear distance between one end and the other end of the coil is equal to or smaller than a linear distance between the one end and a central portion of the coil in a magnetic path direction of the coil.