Magnetic Device Thermal Expansion Management
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Solution Overview
Problem
Magnetic devices experience reliability issues due to thermal expansion mismatch between magnetic cores and other components, leading to core fractures from being squeezed by other components during operation.
Innovation Solution
A magnetic device design with a housing, bobbin, and magnetic core structure that includes a heat conductive glue and gaps between components for effective heat dissipation and reduced mechanical constraint, allowing the magnetic core to displace rather than fracture when temperatures rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If magnetic cores are tightly constrained by other components in the magnetic device, then structural stability is improved, but magnetic cores will fracture when temperature rises due to thermal expansion mismatch
Solution Approach 1:
The patent introduces a cushioning structure (elastic component or gap) between the magnetic core and other components before thermal expansion occurs. This cushioning element absorbs the thermal expansion stress when temperature rises, preventing the magnetic core from fracturing while maintaining structural stability during normal operation.
Solution Approach 2:
The patent modifies the structural parameters by introducing adjustable gaps or elastic elements that can accommodate thermal expansion. The gap size or elastic component properties are designed to change with temperature, allowing the magnetic core to expand freely when heated while maintaining tight constraints during normal operation.
2Manufacturing precision
If magnetic cores are tightly constrained by other components, then assembly precision is improved, but heat dissipation becomes difficult causing temperature rise
Solution Approach 1:
The patent segments the housing or support structure into multiple parts that can independently adjust to accommodate thermal expansion. This segmentation creates thermal pathways that facilitate heat dissipation while maintaining precise assembly positioning, preventing heat accumulation that would otherwise occur with tight constraints.
Solution Approach 2:
The patent introduces an intermediary component (such as a thermal interface material or heat dissipation structure) between the magnetic core and housing. This intermediary facilitates heat transfer from the magnetic core to the housing while maintaining the necessary mechanical constraints, solving both the heat dissipation and assembly precision requirements.
3Volume of moving object
If components are tightly assembled to reduce size, then device compactness is improved, but thermal expansion causes magnetic core fracture
Solution Approach 1:
The patent employs a nested structure where the magnetic core is positioned within a recess or cavity in the housing. This nesting arrangement allows the magnetic core to expand radially when heated without contacting other components, while the overall device volume remains compact. The nested design provides thermal expansion space without increasing external dimensions.
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 enhances heat dissipation and prevents magnetic core fractures by allowing thermal expansion without mechanical constraint, thereby improving the reliability of the magnetic device.
Implementation Method 1
heat conductive glue potted into the space
Implementation Method 2
thermal expansion coefficient of magnetic cores is not consistent with thermal expansion coefficients of other components in the magnetic devices
Data Source
AI summary
A magnetic device includes a housing, a bobbin, a coil, and a magnetic core. The housing has a side plate and a bottom plate. The side plate stands on the bottom plate and forms a space with the bottom plate. The bobbin is at least partially located in the space. The bobbin has a cylinder. The coil is wound around the cylinder. The coil has a portion facing the bottom plate. The magnetic core includes a center column, a side column, and a connecting portion. The center column is located in the cylinder. The side column is located outside the coil and away from the bottom plate, such that the coil is located between the side column and the bottom plate. The connecting portion connects the center column and the side column.