Coaxial Smart Susceptor for Composite Heating
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Solution Overview
Problem
Conventional heating equipment for composite structures fails to maintain a uniform temperature across rework areas, particularly when heat sinks are present, leading to overheating or underheating, and lacks effective temperature regulation over a broad range of temperatures.
Innovation Solution
A coaxially arranged smart susceptor system comprising a core and shells with different Curie temperatures, combined with induction heating using alternating currents to generate magnetic fields and eddy currents, ensuring uniform heat distribution and temperature control from 70° F to 350° F.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional resistive heating blankets are used, then heating capability is provided, but temperature uniformity across the rework area deteriorates due to heat sinks and construction variations
Solution Approach 1:
The patent utilizes the Curie temperature parameter of magnetic materials to fundamentally change the heating mechanism. By selecting magnetic materials with specific Curie temperatures (e.g., 200°F, 250°F, 300°F), the heating blanket automatically adjusts its thermal output based on the temperature reached, providing self-regulating temperature uniformity without complex control systems
Solution Approach 2:
The magnetic material's Curie temperature effect provides inherent feedback control: as the blanket temperature approaches the Curie point, the magnetic properties change, automatically reducing further heating and preventing overheating. This self-regulating mechanism ensures reliable temperature control across the entire rework area, compensating for heat sinks and construction variations
2Temperature
If multi-zone blanket systems or feedback loop systems are added to conventional heating blankets, then temperature control capability is improved, but device complexity increases substantially
Solution Approach 1:
The heating blanket employs self-service through the intrinsic Curie temperature property of magnetic materials. The material automatically regulates heating at its Curie point without requiring external sensors, controllers, or multi-zone systems. This eliminates complex feedback loops and control electronics while maintaining effective temperature regulation across a broad range (e.g., 70°F to 350°F)
Solution Approach 2:
By changing the Curie temperature parameter of the magnetic material, the entire temperature regulation capability is adjusted. Different magnetic materials or compositions can provide regulation at different temperature points, offering broad temperature control capability without adding system complexity or requiring multiple heating zones
3Adaptability or versatility
If conventional heating blankets are used, then heating function is provided, but adaptability to different temperature requirements and heat sink conditions deteriorates
Solution Approach 1:
The patent achieves adaptability by selecting magnetic materials with different Curie temperature parameters. This allows the heating blanket to be tailored for specific temperature requirements (e.g., 200°F, 250°F, 300°F) while maintaining effective temperature control. The parameter change approach provides versatility without complicating the control mechanism
Solution Approach 2:
The inherent feedback mechanism at the Curie temperature ensures that the heating blanket adapts to various heat sink conditions and thermal variations. The automatic regulation at the Curie point compensates for heat drawn by heat sinks and maintains temperature control effectiveness across different application scenarios
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 system provides consistent and uniform heating across composite structures, compensating for heat sinks and maintaining temperature uniformity, preventing overheating or underheating, while allowing for broad temperature regulation.
Implementation Method 1
applying an alternating current to the first conductor; generating a magnetic field in response to the alternating current applied to the first conductor; generating eddy currents that travel circumferentially in the coaxial susceptor in response to the magnetic field generated by the first conductor
Implementation Method 2
generating eddy currents that travel circumferentially in the coaxial susceptor in response to the magnetic field generated by the first conductor; generating eddy currents in the coaxial susceptor in response to the magnetic field generated by the second conductor
Implementation Method 3
heating the coaxial susceptor as a result of the generated eddy currents so as to heat the structure to a uniform temperature
Implementation Method 4
a smart susceptor core comprising an alloy having a first Curie temperature point and a first smart susceptor shell coaxially arranged around the smart susceptor core. The first smart susceptor shell comprising a second Curie temperature point that is different than the first Curie temperature point of the smart susceptor core
Data Source
AI summary
A coaxially arranged smart susceptor conductor, comprising a smart susceptor core comprising an alloy having a first Curie temperature point and a first smart susceptor shell coaxially arranged around the smart susceptor core. The first smart susceptor shell comprising a second Curie temperature point that is different than the first Curie temperature point of the smart susceptor core. In one arrangement, the second Curie temperature point of the first smart susceptor shell is lower than the first Curie temperature point of the smart susceptor core. In another arrangement, the smart susceptor conductor further comprises a second smart susceptor shell disposed about the first smart susceptor shell. The second smart susceptor shell comprising a third Curie temperature point.