Induction Heating Coil Soft Magnetic Flux Guide
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Solution Overview
Problem
Induction heating devices often result in temperature deviations between the outer peripheral and central portions of a heating object due to concentrated magnetic flux, which is particularly pronounced in large-diameter objects.
Innovation Solution
Incorporating a member with soft magnetic materials at the axial end portions of the induction heating coil, which guides the magnetic flux to reduce concentration on the outer periphery, thereby minimizing temperature differences across the heating object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If induction heating coil is used to heat the heating object, then the heating object can be heated without thermal contact, but temperature deviation occurs between the outer peripheral portion and the central portion of the heating object
Solution Approach 1:
A magnetic flux guiding member made of soft magnetic material is introduced as an intermediary between the induction heating coil and the heating object. This member guides and distributes the magnetic flux more uniformly across the heating object's cross-section, preventing concentration at the outer peripheral portion while maintaining the contactless heating capability of induction heating.
Solution Approach 2:
The magnetic flux guiding member is strategically positioned at specific locations (axial end portions or circumferential surface) where magnetic flux concentration occurs. By placing soft magnetic material locally at these critical positions, the magnetic flux is redirected toward the central portion of the heating object, achieving uniform temperature distribution without modifying the entire heating system.
2Area of stationary object
If the heating object has a large diameter, then the heating capacity is increased, but the temperature deviation between outer peripheral and central portions becomes more pronounced
Solution Approach 1:
For large-diameter heating objects, the magnetic flux guiding member extends in the axial direction (perpendicular to the cross-sectional plane) to create a three-dimensional flux distribution pattern. This axial extension allows the soft magnetic material to guide magnetic flux from multiple levels, ensuring uniform heating across the entire large cross-section by addressing the flux distribution problem in an additional dimensional space.
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
The use of soft magnetic materials effectively reduces temperature deviations between the outer peripheral and central portions of the heating object, enhancing heating uniformity, especially for larger diameter objects.
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
a member comprising at least one soft magnetic material, the at least one soft magnetic material being disposed at or on an outer side of each of axial end portions of the induction heating coil... guides the magnetic flux to reduce concentration on the outer periphery
Data Source
AI summary
An induction heating device according to the present invention includes: an induction heating coil 10 with a conductor 100 wound around a predetermined axis line AL; a member 11 including at least one soft magnetic material 110, the at least one soft magnetic material 110 being disposed at or on an outer side of each of axial end portions 102 of the induction heating coil 10 in an extending direction of the axis line AL; and a heating object 2 disposed on an inner side of the induction heating coil 10 and the member 11, the heating object 2 being configured to be heatable by induction heating using a magnetic flux from the induction heating coil 10.