Research On Electromagnetic Coupling Part Of Contless Power Supply In Rail Transport

Serious urban traffic congestion and increasingly serious air pollution are the problems those are difficult to avoid in today’s society. To improve this problem, city public transport has entered a period of rapid development.Modern trams are on the rise worldwide because of its low cost, no emissions, little noise, etc. Catenary can be not used where new energy storage, and the third rail power supply and contactless power supply are adopted. Thus it can reduce the impact on the urban landscape environment, and it is the trend of modern trams development. Contactless power supply is the way that power is transmitted to the vehicles by electromagnetic induction, it’s also a safe, reliable and promising power supply mode. In this paper, based on the modern streetcar contactless power supply system, have the core loosely coupled transformer design optimization research.First, according to the rail traffic background theoretical analysis the three loosely coupled structure of electromagnetic induction, and select the structure that primary with non-core and secondary with magnetic core. Based on mutual inductance circuit, choose the way that series capacitor resonant primary and secondary’s inductances to improving the transmission efficiency. While the optimal coupling parameters can be got with the performance integrated indicators, but in the long term benefits the best parameters is high efficiency that got by changing the mutual inductance, switching frequency and input voltage after analysis.Then, select ferrite core according to the frequency range of electromagnetic induction power supply. Using Maxwell Ansoft electromagnetic simulation software to simulate and theoretical analysis the affects on mutual inductance, which are bought by the core’s shape, former vice-side windings location, distance, former secondary winding methods. Choose the condition that former secondary with the same size and relatively static as the as the basis for the experimental model simulation and estimate the final experimental model and data with saving and convenient are taken into account.Finally, build an experimental model, measure inductance and calculate the resonant capacitor. According to the experimental parameters, get simulation waveforms from the joint simulation of Ansoft and Simplorer, the simulation efficiency from Matlab simulation. The experimental results are basically consistent with the simulation waveforms and simulation efficiency and the theoretical efficiency. Theoretical analysis and simulation analysis are verified correct.