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Electromagnetic System Optimization

> Research > Electromagnetic System Optimization



Electromagnetics is a branch of physics that explores the electric and magnetic phenomena. Maxwell's equations provide how electric and magnetic fields are generated, propagated, and interacted by each other and are influenced by objects. The optimal design for the electromagnetic systems such as wireless power transfer (WPT), electric motors can be determined by electromagnetic analysis.


The goal of our research group is to develop the optimization frameworks for the electromagnetic systems and to apply them to the real-world systems. In order to optimize the systems, it is necessary to determine the appropriate design variables, objective function, and constraint functions. The optimization module determines the optimized design to extremize the objective function while satisfying all the constraints with multiple design variables. The analysis module analyses the target model based on the principles of electromagnetics. Through iterations, the design variables are updated, thereby determining the optimized design at the end of optimization. 

RESEARCH AREA 1Wireless Power Transfer System


Size and shape optimization
An optimization framework for real-world WPT systems is developed through connecting commercial electromagnetic field analysis software and an optimization module using in-house codes. The developed design framework is experimentally validated under the same working conditions.
* S. B. Lee, S. Ahn, and I. G. Jang, “Development of the Optimization Framework for Low-Power Wireless Power Transfer Systems,” IEEE Trans. Microw. Theory Tech., vol. 63, no. 3, pp. 813-820, Mar. 2015.
Layout (or topology) optimization
In this research, a novel layout optimization is proposed to determine the optimal layout of the secondary coils when the primary coils are given. To develop the proposed method, the analysis module is built to evaluate electromagnetic field-related measures and coil related measures. Then, the analysis module is connected with the optimization module. As an example, a portable wireless charger is optimized to maximize the induced voltage while satisfying a mass constraint and the optimized design is validated.
* S. B. Lee and I. G. Jang, “Layout Optimization of the Secondary Coils for Wireless Power Transfer Systems,” IEEE Trans. Microw. Theory Tech. under review.
RESEARCH AREA 2: Electric Motor
  Electric motors, which are applied to various fields, consume about 45% of the global electricity. In particular, the market share of electric and hybrid electric vehicles (EVs and HEVs) rapidly increases due to enforced environmental regulations. However, most customers still hesitate to purchase EVs and HEVs due to high price. Our research aims to improve the performance and reduce the cost of various types of motors based on design optimization.  Design optimization is an effective method to maximize or minimize the objective function while satisfying multiple constraints. Understading of finite element analysis and optimization algorithm is essential to build the script-based shape and topology optimization framework.