Transformer Design Reducing Phase Shift Angles and Core Cross-Sections
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Solution Overview
Problem
The existing transformer designs for AC motor drives require a large number of unique winding phase-shift angles and core cross-sections to accommodate variable output voltages and currents, leading to increased manufacturing costs and complexity.
Innovation Solution
A method is developed to optimize transformer design by simulating transformer models with reduced unique phase shift angles (no more than three) and standardizing the transformer core cross-section, using computer simulations to determine optimal phase angles and core dimensions that meet acceptable levels of current total harmonic distortion (THD), allowing for fewer design variations and standardized components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple secondary windings with different phase shift angles are used to accommodate variable output voltages and currents, then the transformer can support different AC motor drive configurations, but the number of unique winding phase-shift angles increases from 3 to 16 and core cross-sections from 2 to 5, leading to increased manufacturing complexity and cost
Solution Approach 1:
The patent applies universality by designing a single standardized transformer core cross-section and a limited set of three unique winding phase-shift angles that can serve multiple AC motor drive configurations. Instead of creating 16 different phase-shift angles and 5 different core cross-sections to accommodate various output voltages and currents, the invention uses one universal core design and three universal phase-shift angles (0°, ±30°) that can be combined in different ways to achieve the required electrical characteristics for different drive applications.
2Adaptability or versatility
If 16 unique winding phase-shift angles and 5 unique core cross-sections are manufactured to meet all AC motor drive requirements, then all output voltage and current configurations can be supported, but manufacturing costs and production complexity increase significantly
Solution Approach 1:
The patent applies parameter changes by maintaining a fixed standardized core cross-section and instead achieving different electrical characteristics through variations in winding parameters such as the number of turns, winding configurations, and the selection from three standard phase-shift angles (0°, +30°, -30°). This approach changes the adjustable parameters from core geometry and numerous phase-shift angles to winding-specific parameters, which are easier and more cost-effective to manufacture and assemble.
3Ease of manufacture
If a standardized transformer design with reduced phase shift angles and core cross-sections is used, then manufacturing cost and complexity are reduced, but the ability to accommodate variable output voltages and currents must be maintained
Solution Approach 1:
The patent applies segmentation by dividing the transformer into modular components: a standardized core cross-section and multiple secondary windings that can be independently configured. Each secondary winding can be assigned one of three standard phase-shift angles (0°, +30°, -30°), and by selectively connecting and combining these segmented windings, the transformer can provide various output voltage and current configurations without requiring 16 different phase-shift angles or 5 different core designs.
Data Source
AI summary
A method for designing a transformer using three secondary winding phase shift angles and a minimized core cross-sections. The method includes receiving an indication of an acceptable level of total harmonic distortion (THD) for the transformer, identifying a desired number of secondary windings per output phase of the transformer, simulating performance of various models for the transformer various potential phase shift angles, wherein each of the various models includes a set of phase shift angles for the secondary windings of the transformer. The method further includes identifying, based on the simulation, a transformer model that both has no more than three unique phase shift angles in the set and exhibits a primary side THD that is within the acceptable level, identifying an optimized core cross-sections, and reporting the identified transformer model having the three unique phase shift angle and the optimized core cross-sections.