Transformer Enclosure With Segmented Isolation Barriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current transformer assembly methods require costly and time-consuming hand winding due to the need for a center isolation barrier, limiting manufacturing efficiency and increasing the risk of voids during encapsulation, which can lead to thermal issues with the transformer core.
Innovation Solution
A transformer assembly design that allows for machine winding by removing the center isolation barrier and enabling encapsulation or potting of the transformer core after winding, using a cup and lid with larger center holes and a clip for secure mounting to a substrate, facilitating efficient and cost-effective assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a center isolation barrier is provided in the cup to meet UL standards, then electrical isolation is improved, but the center hole diameter is reduced to about 2 mm requiring hand winding which increases manufacturing cost and time
Solution Approach 1:
The isolation barrier is segmented into multiple smaller barriers positioned at different locations around the cup rather than a single center barrier. This allows the center hole to maintain a larger diameter for machine winding while still providing adequate electrical isolation through the distributed barriers.
Solution Approach 2:
The isolation function is extended from a single center barrier to multiple barriers distributed in different spatial dimensions around the cup. This dimensional distribution maintains isolation effectiveness while preserving winding access.
2Strength
If the transformer core is encapsulated or potted before winding the transformer windings, then the transformer core is secured within the cup, but voids are created in the encapsulant which can cause the transformer core to break due to thermal expansion
Solution Approach 1:
The core cup structure with integrated isolation barriers is prepared in advance, allowing the core to be positioned and secured before encapsulation. The pre-configured structure enables subsequent encapsulation without creating voids, as the core is already firmly held in place.
Solution Approach 2:
Instead of encapsulating the core first and then attempting to wind around it, the process is inverted: the core is positioned in the pre-prepared cup with isolation barriers, then windings are added, and finally encapsulation is performed. This reversal eliminates void formation.
3Reliability
If additional encapsulating or potting processes are performed after winding the transformer windings or after mounting the transformer assembly to a substrate, then voids are eliminated, but manufacturing efficiency is reduced and cost is increased
Solution Approach 1:
The core cup with integrated isolation barriers is prepared in advance with proper positioning features. This preliminary preparation allows the core to be securely positioned before winding, enabling a single encapsulation process after winding that eliminates voids without requiring additional post-winding or post-mounting encapsulation steps.
Data Source
AI summary
A transformer assembly includes a transformer core, a cup that receives the transformer core, a lid that engages with the cup and covers the transformer core, and a winding wound around the cup and the lid. The cup and/or the lid include at least one hole through which the transformer core is exposed to an exterior of the cup and the lid when the lid is engaged with the cup.