Low-Stress Magnetic Body Structure for Durable Thermoelectric Elements
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Solution Overview
Problem
Thermoelectric generation devices utilizing the magnetothermoelectric effect face durability issues in high temperature and high humidity environments due to potential disconnections in thin wires, which can impair their functionality.
Innovation Solution
A thermoelectric conversion element with a magnetic body on a substrate, having ferromagnetism or antiferromagnetism and internal stress of 900 MPa or less, which reduces the likelihood of defects and cracks, ensuring high durability even in harsh environments and under bending stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If thin wires are used to connect generator elements in series, then high electromotive force is generated, but disconnection due to cracks occurs more easily
Solution Approach 1:
The patent changes the physical state and mechanical properties of the magnetic body by controlling its internal stress parameter. By adjusting the internal stress to be 900 MPa or less, the magnetic body becomes more resistant to crack propagation and disconnection, thereby improving reliability while maintaining the thin-wire series connection structure for high electromotive force generation
2Power
If the magnetic body is made thicker to increase electromotive force, then power generation increases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of increasing the thickness of the magnetic body to boost electromotive force, the patent changes the internal stress parameter of the existing thin magnetic body structure. By optimizing the internal stress to 900 MPa or less, the device achieves improved performance without increasing structural complexity or manufacturing difficulty
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 thermoelectric conversion element exhibits high durability in high temperature and high humidity environments and maintains functionality even when subjected to bending stress, with the ability to generate increased electromotive force without the need for excessive thickness, enhancing its operational reliability.
Implementation Method 1
Thermoelectric conversion elements that utilize magnetothermoelectric effect have been known
Implementation Method 2
the magnetic body has an internal stress of 900 MPa or less
Data Source
AI summary
A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. The magnetic bodies have an internal stress of 900 MPa or less.