Design of ferrite core based on dynamic wireless power transfer in EV

Abstract

Electric vehicle (EV) is leading to green future transportation. Instead of it helps to reduce gas emission to the environment, EV technology cut the cost of petrol prices. However, consumers are still suffering from the range anxiety and refuelling time. The range anxiety is the limited driving range. This is due to the limited numbers of EV charging stations available throughout Malaysia cause a big problem for consumers to travel across city if they are running out of battery. The long charging time for a full battery charge also is another factor. The standard charging time for a full battery is about 12 to 30 minutes. Thus, wireless charging is an alternative recharging option. Wireless charging is the contactless connection between grid and vehicle which can be established in a few seconds. Static wireless charging allows recharging process to take place once the vehicles is located at the above charging plate and must be in static. Whilst, dynamic wireless charging is better for recharging process where recharging the battery pack is done in motion. However, the biggest elements that must be tolerated with the dynamic wireless charging system is the airgap and misalignment. Even though many studies show the effectiveness of wireless pad design using ferrite core, they rarely proposed an effective method to solve the problems by varying the geometric shape of ferrite shape. Therefore, this thesis will propose a few combinations of ferrite core shapes on wireless power transfer (WPT) system on EV. This works is divided into three technical tests. The first and second tests will be on simulation analysis. The third test is on experimental work. The design that improves the coil coupling is the main contribution of this study. From the simulation and experiment analysis, ferrite pair that have high magnetic flux density delivered more power transfer.