Multi-phase Transformer Cooling Duct Placement
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Solution Overview
Problem
Multi-phase transformers, such as 9-phase transformers, experience unbalanced leakage inductance due to winding and air duct placement, leading to increased total harmonic distortion and excessive heat generation, which can be mitigated but at the cost of increased size and expense with additional cooling ducts.
Innovation Solution
A transformer design with a laminated core and coils constructed around it, featuring multiple windings and strategically placed cooling ducts between the core and adjacent windings to minimize leakage inductance and enhance cooling efficiency, while maintaining a compact and cost-effective structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple cooling ducts are added to reduce heat generation, then cooling efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies local quality by placing cooling ducts specifically between the core and adjacent windings where heat generation is most intense, rather than uniformly distributing them throughout. This targeted approach provides effective cooling at the critical heat generation zone while minimizing the total number of ducts required, thus reducing device complexity and cost.
2Manufacturing precision
If windings are constructed in multiple layers to reduce leakage inductance, then leakage inductance balance is improved, but heat generation increases
Solution Approach 1:
The patent introduces cooling ducts as intermediary elements between the core and windings. These ducts serve as mediators that facilitate heat dissipation from the winding structures, enabling the use of multi-layer windings for better leakage inductance balance while compensating for the increased heat generation through enhanced cooling.
3Temperature
If the number of cooling ducts is increased to improve cooling, then temperature control is improved, but transformer size increases
Solution Approach 1:
The patent segments the cooling function by placing discrete cooling ducts at specific critical locations between the core and windings, rather than using a single large cooling structure. This segmentation allows effective heat dissipation from high-temperature zones while maintaining a compact overall transformer size.
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 leakage inductance imbalance, minimizes heat generation, and optimizes cooling, thereby improving the transformer's performance and reducing costs by efficiently dissipating heat and maintaining a compact size.
Implementation Method 1
Cooling ducts are typically employed to dissipate the heat generated by the transformer
Implementation Method 2
Cooling ducts are provided in each coil, wherein at least one cooling duct is disposed between the laminated core and an adjacent winding of the respective coil
Data Source
AI summary
A transformer for converting 3 phase AC to 9 phase AC power is provided. The transformer comprising a laminated core, first, second and third coils constructed on the laminated core, each coil including several windings. Cooling ducts are provided in each coil, wherein at least one cooling duct is disposed between the laminated core and an adjacent winding of the respective coil. The transformer further includes first, second and third input terminals each linked to the first, second and third coils, and configured to receive a first, second and third phases of input AC power and first through ninth output terminals linkable to first through ninth output power lines.