Flattened Induction Coil Geometry for Faster Susceptor Heating
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Solution Overview
Problem
Existing induction heating systems for aerosol-generating devices face challenges in achieving a sufficient temperature level within a short period, particularly when operated intermittently, such as on a user's demand, due to inefficient heating of flat or sheet-like susceptors.
Innovation Solution
The use of a cylindrical-helical induction coil with a non-circular flattened transverse cross-sectional shape, comprising two opposing flat sections connected by opposing curved sections, to reduce the radial distance between the coil and the susceptor, enhancing magnetic field strength and heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional circular induction coil is used, then the device structure is simple and easy to manufacture, but the heating efficiency is insufficient and the heating time is long when operating intermittently
Solution Approach 1:
The induction coil is designed with a flattened transverse cross-section instead of a conventional circular shape. This asymmetric geometry allows the coil to be positioned closer to the flat susceptor surface, reducing the radial distance and enhancing magnetic field strength at the heating location, thereby improving heating efficiency during intermittent operation
Solution Approach 2:
The coil structure is optimized locally at the transverse cross-section to match the flat geometry of the susceptor. By concentrating the magnetic field generation in the region where the susceptor is located, the system achieves more effective heating without requiring complex overall device modifications
2Temperature
If the induction coil is positioned farther from the susceptor, then the coil structure is simpler and easier to manufacture, but the magnetic field strength at the susceptor location is reduced
Solution Approach 1:
The flattened transverse cross-section of the induction coil enables closer positioning to the flat susceptor while maintaining manufacturing feasibility. This geometric adaptation allows the coil to achieve stronger magnetic field coupling with the susceptor without requiring complex precision positioning mechanisms
3Productivity
If the radial distance between the induction coil and susceptor is reduced, then the magnetic field strength and heating efficiency are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The flattened coil geometry inherently accommodates the reduced radial distance requirement by matching the flat susceptor shape. This design approach distributes the positioning tolerance more favorably compared to circular coils, as the flat geometry provides better geometric compatibility and more forgiving alignment characteristics
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 allows for faster heating of flat or sheet-like susceptors to achieve a desired temperature level within a shorter period, improving heating efficiency and ensuring homogeneous magnetic field generation.
Implementation Method 1
at least one cylindrical-helical induction coil for generating an alternating magnetic field allowing to inductively heat a susceptor within an interior space of the induction coil
Implementation Method 2
The field is used to induce at least one of heat generating eddy currents or hysteresis losses in a susceptor which is arranged in thermal proximity or direct physical contact with an aerosol-forming substrate that is capable to form inhalable aerosols upon heating
Data Source
AI summary
An induction heating module for an inductively heating aerosol-generating device is provided, the module including: a cylindrical-helical induction coil to generate an alternating magnetic field allowing to inductively heat a susceptor within an interior space of the coil to heat an aerosol-forming substrate in thermal contact or thermal proximity with the susceptor; and a coil support to support the coil and including a support tube, an outer circumference of the tube has a non-circular flattened transverse cross-sectional shape including two opposing flat sections connected by two opposing at least partially curved sections, the coil being wound around the outer circumference such that a transverse cross-sectional shape of the coil follows the shape of the outer circumference, and the shape of the outer circumference includes major and minor axes of symmetry.