Optimization And Experiment Of Inductive Power Tansfer For Electric Vehicles

With the increasingly serious energy crisis and environmental problems, electric vehicles have become a research hotspot because of its environmental advantages. However, the current cable charging mode problems limiting the promotion of electric vehicles. The inductive power transfer for electric vehicles has been increasing popular for its inherent convenience and safety factors. This paper develops the design of the inductive power transfer for electric vehicles based on circular electromagnetic coupling structure. This design realize a high power transmission using the fixed-frequency control with double-LCL resonant compensation topology.The main limiting factor is the performance of the magnetic structure that affects transfer power ef?ciently. This paper presents a method to design and optimize the circular magnetic structures. The simulation model is built by 3-D finite-element-analysis software called Ansoft. The key parameters such as the diameter, number of the coil and the length, width, thickness, number, the position of the ferrites are optimized based on the standards of power transmission capacity and coil/ferrites utilization. A 600 mm diameter optimized pad is constructed to verify the correctness and effectiveness of the proposed method by its vertical and horizontal offset performance of the simulation and experiment testThe electromagnetic coupling characteristics of the inductive power transfer for electric vehicles is analysed based on the mutual inductance model and the features of four basic resonant compensation topologies is simply introduced. Then the characteristics of the transmitting and receiving terminal in the double-LCL resonant compensation topology are discussed in detail under different horizontal and vertical misalignment conditions.The whole inductive power transfer for electric vehicles experimental system with the double-LCL resonant compensation topology is sutup using the optimized 600 mm circular pad. Then the characteristics of the transmitting and receiving terminal under different horizontal(200mm gap) and vertical misalignment(no horizontal misalignment) conditions are verified The experimental system can transfer the maximum output power about 7.26 kW with the highest efficiency of 95.37% when the gap is 200 mm.