Resin-Molded Inductor Gap Structure for Thermal Expansion Stability
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Solution Overview
Problem
Conventional inductors face structural defects due to thermal expansion of magnetic bodies, which have a higher thermal expansion coefficient than the resin material, leading to cracks and instability.
Innovation Solution
The inductor design incorporates a gap between the resin material and the magnetic body surfaces, allowing for thermal expansion to be absorbed, thereby preventing the resin from being pressed against the expanded magnetic bodies and reducing structural defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the magnetic body is tightly embedded in the resin material, then the structural integrity is improved, but thermal expansion causes cracks and structural defects
Solution Approach 1:
The patent introduces a gap between the magnetic body and resin material before thermal expansion occurs. This gap acts as a cushioning space that absorbs the dimensional changes during thermal expansion, preventing the magnetic body from pressing against and cracking the resin material. The gap is deliberately designed with specific dimensions to accommodate the expected thermal expansion range.
Solution Approach 2:
The gap functions as an intermediary space between the magnetic body and resin material, mediating the thermal expansion interaction. Instead of direct contact that causes stress concentration and cracking, the gap allows the magnetic body to expand freely while maintaining structural integrity of the overall assembly.
2Reliability
If a gap is provided between the resin material and magnetic body, then thermal expansion is accommodated, but the structural integrity may be compromised
Solution Approach 1:
The patent optimizes the gap dimensions as a critical parameter to balance thermal expansion accommodation and structural integrity. By carefully controlling the gap width and positioning, the design achieves sufficient space for thermal expansion while maintaining adequate structural strength for practical applications.
3Manufacturing precision
If the magnetic body is tightly fixed in the resin material, then positioning precision is improved, but inductance varies due to thermal expansion
Solution Approach 1:
The gap is designed to accommodate thermal expansion that would otherwise cause inductance variations. By providing this expansion space beforehand, the magnetic body can change dimensions with temperature without altering its functional performance, maintaining stable inductance 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
The design effectively suppresses structural defects by accommodating thermal expansion, maintaining inductance stability and reducing variations, while also reducing the number of components in DC-DC converters.
Implementation Method 1
the magnetic body may thermally expand inside the resin material... a gap is provided between the resin material and at least one first surface of the magnetic body... allowing for thermal expansion to be absorbed
Data Source
AI summary
An inductor includes a coil conductor, a magnetic body, and a resin material including the coil conductor and the magnetic body therein, and a gap is provided between the resin material and at least one first surface of the magnetic body.