Inductive Susceptor Temperature Control via Curie Point Regulation
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Solution Overview
Problem
Conventional techniques for forming composite articles, such as autoclaves and tooling, have large thermal masses that result in slow heating and cooling times, poor temperature control, and inefficient energy use, making it difficult to achieve optimal mechanical properties in thermoplastic articles.
Innovation Solution
A system and method using an induction coil and ferromagnetic susceptor face sheets to inductively heat a workpiece, with a current controller adjusting the alternating current to control temperature and heating rate, allowing for rapid and uniform heating and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If autoclaves and conventional tooling are used to heat preforms, then the preform can be heated to the desired temperature, but the heating and cooling times are significantly prolonged due to large thermal mass
Solution Approach 1:
The system divides the heating function into separate components: induction coils for rapid heating and active cooling systems for quick temperature reduction. This segmentation allows each component to be optimized independently, eliminating the need for large thermal mass autoclaves and enabling rapid thermal cycling of the preform.
Solution Approach 2:
The patent replaces the mechanical thermal mass-based heating system (autoclave) with an electromagnetic induction heating system. The induction coils generate electromagnetic fields that directly induce currents in the preform, heating it rapidly without requiring large thermal mass, thereby significantly reducing heating and cooling times.
2Temperature
If autoclaves and conventional tooling are used, then heating can be performed, but temperature control and uniform heat distribution are poor due to large thermal mass
Solution Approach 1:
The induction coils are positioned to provide localized heating zones within the mold cavity, allowing different regions of the preform to be heated uniformly and independently. This local quality approach ensures consistent temperature distribution across the preform surface, improving manufacturing precision.
Solution Approach 2:
The system incorporates temperature sensors and control systems that continuously monitor preform temperature and adjust induction coil power in real-time. This feedback mechanism maintains precise temperature control and uniform heat distribution, preventing overheating or uneven heating that would occur with conventional autoclave methods.
3Temperature
If autoclaves and conventional tooling are used for heating, then the preform can be heated, but energy consumption is high due to large thermal mass
Solution Approach 1:
The patent replaces the energy-intensive mechanical autoclave heating system with efficient electromagnetic induction heating. The induction coils transfer energy directly to the preform through electromagnetic fields, eliminating the energy waste associated with heating large thermal mass autoclave walls and achieving the same heating effect with significantly lower electrical power consumption.
Solution Approach 2:
The induction heating system enables the preform to heat itself through induced currents within its own material structure. This self-heating mechanism eliminates the need for external thermal mass to transfer heat, resulting in highly efficient energy utilization and reduced electrical power consumption compared to conventional autoclave methods.
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 approach provides high temperature controllability, reduces heating and cooling times, and ensures uniform heat distribution, optimizing mechanical properties while being energy-efficient and cost-effective.
Implementation Method 1
The induction coil may be configured to conduct an alternating current and generate a magnetic field in response to the alternating current. The susceptor face sheet may be formed of a ferromagnetic alloy having a Curie temperature and being inductively heatable to an equilibrium temperature approaching the Curie temperature in response to the magnetic field.
Implementation Method 2
The susceptor face sheet may be formed of a ferromagnetic alloy having a Curie temperature and being inductively heatable to an equilibrium temperature approaching the Curie temperature in response to the magnetic field.
Implementation Method 3
The susceptor face sheet may be formed of a ferromagnetic alloy having a Curie temperature and being inductively heatable to an equilibrium temperature approaching the Curie temperature
Data Source
AI summary
A system for inductively heating a workpiece may include an induction coil, at least one susceptor face sheet, and a current controller coupled. The induction coil may be configured to conduct an alternating current and generate a magnetic field in response to the alternating current. The susceptor face sheet may be configured to have a workpiece positioned therewith. The susceptor face sheet may be formed of a ferromagnetic alloy having a Curie temperature and being inductively heatable to an equilibrium temperature approaching the Curie temperature in response to the magnetic field. The current controller may be coupled to the induction coil and may be configured to adjust the alternating current in a manner causing a change in at least one heating parameter of the susceptor face sheet.