Abstract
The magnetic core is an important part of the magnetic coupling system in wireless power transmission (WPT) for EVs. It helps to increase the coupling coefficient and reduce magnetic field leakage. However, it also brings additional core loss. While the traditional core loss model cannot be used directly due to the uneven distribution of the magnetic flux density, this paper focuses on the flux density distribution in the disk core of a WPT system. Based on a finite element analysis (FEA) simulation and a theoretical magnetic flux density distribution analysis, a mathematical model of magnetic flux density distribution is built, which is regarded as a quadratic function. Through this model, the flux density distribution can be calculated by the electrical and mechanical specifications of the magnetic coupling system. Combining the model of flux density distribution, the disk core loss model of the WPT system is proposed—the idea of which is dividing the disk core into several circle sheets firstly, and then summing the core loss of all circle sheets. Finally, the FEA simulation results verify the proposed model as being correct and flexible.
Highlights
College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116, China; Abstract: The magnetic core is an important part of the magnetic coupling system in wireless power transmission (WPT) for EVs
This paper focuses on the magnetic flux density distribution in the disk core of the WPT system
Magnetic coupling systems, while a disk structure is used as the magnetic core structure
Summary
To ease the shortage of fossil energy and the problem of environmental pollution, electric vehicles have been adopted in recent years [1,2]. In [18,19,20], the two-winding method is adopted to calculate the product of the measured current of the power winding and the measured voltage of the auxiliary winding to obtain the core loss of the magnetic component. The magnetic flux density in the ferrite inductor and the transformer of the switching mode power supply (the air gap is generally small and the coupling coefficient is close to 1) is basically uniform; the Steinmetz formula calculation result can effectively characterize the core loss of inductors and transformers [26,27].
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