Three-Phase Transformer with Rotation-Symmetric Iron Core
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Solution Overview
Problem
Existing three-phase transformers face challenges with asymmetrical iron core structures leading to uneven magnetic flux density, heat generation, leakage flux, and reduced mutual inductance, which affect efficiency and safety, particularly in large transformers.
Innovation Solution
A three-phase transformer design featuring a first and second plate iron core with rotation-symmetrically arranged columnar iron cores and coils, allowing for balanced phases, reduced leakage flux, and increased mutual inductance, achieved through the strategic placement and connection of columnar iron cores and coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an asymmetrical iron core structure is used, then the transformer can be manufactured with simpler structure, but the magnetic flux density becomes uneven and leakage flux increases
Solution Approach 1:
The patent applies asymmetry in reverse - it deliberately creates a symmetrical three-phase iron core structure where all three phases have equal magnetic path lengths and equal cross-sectional areas. This symmetry ensures uniform magnetic flux density distribution across all phases, preventing the leakage flux problems that arise from asymmetrical structures while maintaining manufacturing feasibility through standardized components.
Solution Approach 2:
The patent ensures that each phase of the iron core has identical local properties - equal cross-sectional areas, equal magnetic path lengths, and equal numbers of winding turns. This local quality uniformity across all three phases guarantees equal magnetic flux density and eliminates the harmful effects of asymmetry while allowing for efficient manufacturing.
2Ease of manufacture
If the magnetic path lengths are not equalized, then the structure can be simpler to manufacture, but heat generation increases and efficiency decreases
Solution Approach 1:
The patent deliberately implements symmetry in the magnetic path lengths of all three phases. By ensuring that each phase has an equal magnetic path length, the transformer achieves balanced operation with uniform current distribution, which minimizes eddy current losses and heat generation while maintaining structural simplicity through standardized design.
Solution Approach 2:
The patent creates equipotential conditions for the magnetic paths by equalizing the magnetic reluctance of all three phases through identical path lengths and cross-sectional areas. This equipotentiality ensures that magnetic flux distributes evenly across phases, preventing localized overheating and reducing overall energy losses.
3Ease of manufacture
If the iron core is made from wound thin plates, then manufacturing is easier, but magnetic flux does not flow in minimum route and mutual inductance decreases
Solution Approach 1:
The patent segments the iron core into three distinct columnar cores, each with its own winding, arranged symmetrically around a central axis. This segmentation allows each phase to have its own optimized magnetic path while maintaining overall symmetry, ensuring that magnetic flux flows efficiently through each columnar core in its minimum route and achieves the required mutual inductance between phases.
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
This design balances the three phases, reduces leakage flux, and enhances efficiency by effectively utilizing magnetic flux, leading to improved performance and safety in transformer operations.
Implementation Method 1
coils including a plurality of primary coils and a plurality of secondary coils, the number of the primary coils being an integer multiple of 3, the number of the secondary coils being an integer multiple of 3, the primary coils and the secondary coils being wound on the individual columnar iron cores
Implementation Method 2
the columnar iron cores being disposed rotation-symmetrically with respect to an axis equidistant from central axes of the columnar iron cores
Data Source
AI summary
A three-phase transformer according to an embodiment includes a first plate iron core and a second plate iron core disposed opposite each other; a plurality of columnar iron cores disposed between the first plate iron core and the second plate iron core so as to be connected to the first plate iron core or the second plate iron core, the number of the columnar iron cores being an integer multiple of 3, the columnar iron cores being disposed rotation-symmetrically with respect to an axis equidistant from central axes of the columnar iron cores; and coils including a plurality of primary coils and a plurality of secondary coils, the number of the primary coils being an integer multiple of 3, the number of the secondary coils being an integer multiple of 3, the primary coils and the secondary coils being wound on the individual columnar iron cores.