Induction Heating Coil End Wall Portions for Flux Concentration
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Solution Overview
Problem
Induction heating coils experience excessive heat generation at their end portions, leading to decreased heating efficiency and cooling challenges, as the magnetic field becomes extremely large at these areas, causing the coil itself to overheat.
Innovation Solution
The use of end wall portions made of soft magnetic material to cover at least part of the end portions of the induction heating coil, which attracts the magnetic flux and reduces the magnetic field intensity at these areas, thereby suppressing extreme heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the induction heating coil is used to heat the heating object, then the heating object can be heated by electromagnetic induction, but the magnetic field becomes extremely large at the end portions of the induction heating coil, causing extreme heat generation at these portions
Solution Approach 1:
A magnetic flux concentrating member made of soft magnetic material is introduced as an intermediary between the induction heating coil and the heating object. This member concentrates the magnetic flux in the axial direction, preventing excessive magnetic field intensity at the coil's end portions. As a result, the harmful self-heating of the coil ends is reduced while maintaining effective heating of the target object, thereby resolving the energy loss issue.
2Reliability
If the end portions of the induction heating coil generate abnormal heat, then the heating efficiency decreases, but it becomes difficult to cool the induction heating coil
Solution Approach 1:
The magnetic flux concentrating member serves as a mediator that redistributes the magnetic flux density along the coil's axial length. By concentrating flux through the soft magnetic material, the peak temperatures at the coil ends are reduced to manageable levels, enabling effective cooling systems to function properly and improving the overall reliability of the heating device.
3Power
If the magnetic field intensity is increased at the end portions of the induction heating coil, then the heating effect is enhanced, but the electrical resistance increases due to extreme heat generation
Solution Approach 1:
The soft magnetic flux concentrating member acts as an intermediary that guides and concentrates magnetic flux uniformly along the axial direction. This prevents the formation of extremely high magnetic field intensities at the coil ends that would otherwise cause excessive heat generation and increased electrical resistance. The result is maintained heating power with reduced energy losses.
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 ensures uniform heat generation across the induction heating coil, reducing electrical resistance and preventing local overheating, thus enhancing heating efficiency and facilitating better cooling.
Implementation Method 1
induction heating is known to heat a heating object by electromagnetic induction. The induction heating is performed by placing an induction heating coil near a heating object containing magnetic and/or conductive materials and generating a magnetic field near the induction heating coil.
Implementation Method 2
end wall portions made of a soft magnetic material, the end wall portions being disposed to cover at least a part of end portions on both sides of the induction heating coil in an axial direction
Implementation Method 3
The magnetic field can be generated by passing an electric current through the induction heating coil. The current flowing through the induction heating coil can be a large current obtained by amplifying alternating current from a high-frequency inverter with a transformer.
Data Source
AI summary
An induction heating coil unit 2 according to the present invention is an induction heating coil unit 2being configured to be able to heat a heating object 1 by induction heating, wherein the induction heating coil unit 2 includes: an induction heating coil 20 wherein conductors 200 are wound around a predetermined axis line AL; and end wall portions 21 made of a soft magnetic material, the end wall portions 21 being disposed to cover at least a part of end portions on both sides of the induction heating coil 20 in an axial direction, and wherein each of the conductors 200 has an opposing surface 201 opposing to an outer peripheral surface or an inner peripheral surface of the heating object 1, and wherein the opposing surface 201 includes a parallel portion 201a extending parallel to the axis line AL.