Multi-phase Transformer with Adjustable Windings
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Solution Overview
Problem
Existing multi-phase transformers that convert 3-phase AC to 9-phase AC power require additional windings to compensate for output voltage drops, increasing system size and cost.
Innovation Solution
A transformer design with adjustable coils, where each coil has multiple serial windings forming a polygon or hexagon, allowing for adjustable turns ratios without extra windings, enabling operation as a step-up or step-down transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a step-up transformer is externally coupled to the multi-phase transformer to compensate for output voltage drops, then the output power is maintained, but the system cost and size increase
Solution Approach 1:
The transformer is designed to perform multiple functions: it converts 3-phase AC to multi-phase AC power while simultaneously functioning as a step-up or step-down transformer through adjustable turns ratios. This eliminates the need for separate external step-up transformers, reducing system complexity and cost while maintaining output power
Solution Approach 2:
The transformer incorporates adjustable turns ratios that can be modified based on system requirements. By changing the number of turns in the windings, the transformer can adapt to different voltage compensation needs, providing dynamic voltage adjustment capability within a single device
2Reliability
If extra windings are added to the transformer to compensate for output voltage drops, then the voltage compensation is achieved, but the transformer size and cost increase
Solution Approach 1:
The transformer windings are designed to serve dual purposes: they perform the primary 3-phase to multi-phase power conversion while also providing voltage compensation functionality. The same windings can be configured to act as step-up or step-down windings, eliminating the need for separate compensation windings and reducing transformer size
Solution Approach 2:
The transformer utilizes adjustable turns ratios as a key parameter to achieve voltage compensation. By modifying the number of turns in the windings, the transformer can compensate for voltage drops without requiring additional windings, thus maintaining a compact size while achieving the desired voltage regulation
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
Enables voltage ratio adjustment without additional windings, reducing system costs and size, and compensating for output voltage drops, while maintaining desired output power levels.
Implementation Method 1
a transformer for converting 3 phase AC to 9 phase AC power includes first, second and third coils
Data Source
AI summary
A transformer for converting 3 phase AC to 9 phase AC power is provided. The transformer includes first, second and third coils, each coil having a plurality of serial windings coupled together to form a polygon. The transformer further includes first, second and third input terminals each linked to a respective winding of the first, second and third coils. The input terminals are configured to receive a first, second and third phases of input AC power and at least one selected input terminal of the first, second and third input terminals is adjustable to alter a number of turns of the respective winding of the corresponding first, second or third coil on either side of the selected input terminal. The transformer further includes first through ninth output terminals linkable to first through ninth output power lines.