| In recent years,the demand for intelligent and automated operation of the storage system has caused the contactless charging system to generate new application value in the guided vehicles operation scenario.Combining existing theoretical systems and analysis methods of loosely coupled magnetic coupling system to explore the design methods applied to tightly coupled magnetic coupling system of guided vehicless has far-reaching theoretical and practical significance.This thesis has carried out the following research on the design of the magnetic coupling system in the guided vehicles application scenario.Firstly,from the perspective of universality,the circuit model construction and analysis of the magnetic coupling system are carried out,and three measures to improve system efficiency are summarized.Based on the guided vehicles application scenario,combined with circuit modeling and finite element simulation methods,two major challenges for the design of the magnetic coupling system are proposed.Aiming at the electromagnetic environment safety problem of the magnetic coupling mechanism,the magnetic shielding mechanism of the high-permeability and high-conductivity materials is analyzed,and the influence of the high-conductivity materials on the contactless charging system is analyzed from the perspective of circuit transmission performance.The above can provide theoretical guidance for the design of magnetic coupling system.Secondly,in order to reduce the reactive power loss of the system,the compensation topology is selected and the parameters are designed.The equivalent circuit method and superposition theorem are used to analyze the characteristics of the bilateral LCC and SS compensation networks respectively.It is pointed out that both compensation topologies have constant frequency operating characteristics and can achieve constant current output.The parameter design of two compensation topologies is studied.By introducing the coefficient r _I that measures the input and output parameters,the system energy efficiency characteristics are optimized.By creating an inductive condition for the input impedance of the resonant network,two methods for adjusting the parameters of compensation topologies are discussed to realize zero-voltage switching(ZVS)of the primary-side inverter.The output characteristics of the system under the two compensation methods are verified by simulation.Comprehensive analysis is made from the aspects of the detuned state's influence on the two compensation topologies,the system efficiency and the compactness of the structure.Finally,the compensation method of the system is determined.Based on the finite element model construction and simulation method,the anti-offset characteristics of three commonly used magnetic coupling coil structures are compared and analyzed,and a suitable coil structure is selected.Taking into account the limited space of the chassis of the guided vehicles,the anti-offset characteristics of five sets of magnetic coupling coils with the same area and less than 200mm in length and width are analyzed to determine the size of the secondary coil.With reference to the design method of the primary coil of the tram,the size design proposal of the primary coil in the magnetic coupling system is given.By establishing a magnetic circuit model,the magnetic resistance distributed in the mutual coupling region and the self-coupling region is optimized.On this basis,a convolute core structure is proposed.Based on the electromagnetic safety protection standards,the magnetic shielding structure of the magnetic coupling mechanism is designed,and the effectiveness of the shielding method is verified by simulation.Finally,an experimental platform for a contactless charging system with an output power of 2k W is established.The parameters of the magnetic coupling system,the effect of magnetic shielding and the energy efficiency characteristics of the system can be verified by experiments.Figures:96,Tables:13,References:75. |
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