Multi-Phase Transformer Core Layout for Balanced Magnetic Resistance
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Solution Overview
Problem
Conventional multi-phase transformers experience an imbalance in magnetic resistance due to differences in magnetic path lengths and joint portion gaps in the electromagnetic steel sheets, leading to uneven magnetic flux distribution and performance issues.
Innovation Solution
A multi-phase transformer design featuring a centrally-disposed first core and multiple second cores arranged in a loop-shaped magnetic path configuration, with primary and secondary windings wound on each second core, ensuring balanced magnetic resistance across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional three-phase transformer cores are arranged linearly symmetrically with respect to a center line, then the transformer structure is simple and easy to manufacture, but the side cores have different magnetic path lengths causing imbalance in magnetic resistance
Solution Approach 1:
The patent applies asymmetry by arranging the three-phase winding cores in a triangular configuration rather than linear symmetry. The cores are positioned at vertices of an equilateral triangle, creating asymmetric spatial relationships that result in equal magnetic path lengths from each core to the central yoke, thereby achieving balanced magnetic resistance despite the asymmetric layout
Solution Approach 2:
The patent transitions from a linear one-dimensional arrangement to a two-dimensional triangular configuration. By positioning cores in a plane rather than along a line, the magnetic flux paths are equalized through geometric symmetry in the plane, solving the magnetic resistance imbalance problem while maintaining manufacturing simplicity
2Device complexity
If joint portions of electromagnetic steel sheets are assembled together, then the transformer structure is formed, but gaps at joint portions generate air layers that constitute large magnetic resistance causing imbalance
Solution Approach 1:
The patent merges the magnetic paths of all three phases through a common central yoke structure. By providing a centralized magnetic path that all three winding cores connect to equally, the design ensures that joint portion gaps affect all phases uniformly, maintaining magnetic resistance balance despite the presence of gaps in the assembled steel sheets
3Reliability
If directive electromagnetic steel sheets are used in the transformer, then the magnetic performance is improved, but assembly at joint portions becomes difficult
Solution Approach 1:
The patent segments the transformer into modular components: three separate winding cores, a central yoke, and end yokes. This segmentation allows directive electromagnetic steel sheets to be used within each module where precise assembly is critical, while the modular design simplifies overall assembly by allowing modules to be constructed and then connected together with standardized interfaces
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 achieves balanced magnetic resistance between phases, eliminating imbalances in voltage, current, and magnetic flux, thereby enhancing the transformer's performance and reducing harmonic imbalances.
Implementation Method 1
A multi-phase transformer includes a centrally-disposed first core, a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, and a primary winding and a secondary winding wound on each of the second cores
Data Source
AI summary
A multi-phase transformer includes a centrally-disposed first core, a plurality of second cores each provided outside the first core so as to constitute a loop-shaped magnetic path with respect to the first core, and a primary winding and a secondary winding wound on each of the second cores.