Segmented Transformer Core Structure for Thermal Stress Relief
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Solution Overview
Problem
In transformer cores, particularly those with E-shaped configurations, uneven cooling leads to temperature gradients and stress, increasing heat generation and loss, which can damage the core due to fixed contact points and non-uniform thermal expansion.
Innovation Solution
A core design featuring a winding part surrounded by separate, movable wall parts that can relieve stress through thermal expansion, reducing heat generation and loss by allowing parts to slide along the direction of applied stress, and improving cooling efficiency by spacing heat-generating components away from cooling areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the core is cooled by a cooling part, then the temperature is reduced, but a temperature gradient occurs between cooled portions and other portions, causing stress and increased loss
Solution Approach 1:
The core is divided into multiple independent legs that can expand and contract independently. This segmentation allows each leg to accommodate thermal expansion differently, reducing stress concentration and minimizing the negative effects of temperature gradients on core loss.
Solution Approach 2:
The core structure is designed to be dynamically adaptable to thermal changes. The legs can move relative to each other, allowing the core to adjust its configuration in response to thermal expansion, thereby maintaining structural integrity and reducing stress-induced losses during cooling operations.
2Stability of the object's composition
If components are fixed to maintain relative positions, then structural stability is achieved, but stress concentration occurs at fixed contact points, potentially damaging the core
Solution Approach 1:
The core structure is segmented into multiple legs that are not rigidly fixed to each other. This segmentation allows each leg to move independently, distributing stress throughout the structure rather than concentrating it at fixed contact points, thereby maintaining both stability and strength.
Solution Approach 2:
The core employs a dynamic structure where legs can move relative to one another in response to thermal expansion and contraction. This dynamic capability prevents stress concentration at fixed points while maintaining overall structural stability during thermal cycles.
3Temperature
If the temperature gradient increases, then cooling effectiveness is improved, but stress between legs increases, potentially damaging the core
Solution Approach 1:
The core is divided into separate legs that can expand and contract independently. This segmentation allows each leg to accommodate thermal expansion without transmitting excessive stress to adjacent legs, enabling effective cooling while preventing stress-induced damage.
Solution Approach 2:
The dynamic structure allows the core to adapt to temperature gradients by permitting relative movement between legs. This flexibility enables the core to maintain strength even when significant temperature gradients exist, as the structure can adjust rather than fracture under differential thermal expansion.
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 reduces heat generation and loss by mitigating stress-induced thermal expansion, preventing core damage and enhancing cooling performance, while simplifying the structure by eliminating the need for additional fixing components like bobbins.
Implementation Method 1
a temperature gradient occurs between a portion cooled by the cooling part and other portions. As a result, a stress is applied to the core due to heat generation in the core
Data Source
AI summary
A core includes a winding part, and a wall part including a first wall part, a second wall part spaced apart from the first wall part and disposed opposite to the first wall part, a third wall part in contact the first wall part, and a fourth wall part disposed opposite to the third wall part. The wall part surrounds the winding part.