Abstract
Utilization of wireless power transfer in light rail transits is seen as one solution for electrification of lines. The main advantage of this supply system is the reduction of installation; moreover, the alignment between the transmitter coil in the track and the receiver coil in the train should be perfect in order not to affect the power transfer. To reduce the effects of misalignment on the input and output electric parameters of the system, a new planar core and coil design, called hybrid intercore coil, is proposed. The proposed design uses a magnetic material layer between the windings in the inner half of the coil to create a non-uniform magnetic field distribution, which makes the system more robust against the effects of coil misalignment on the system current and voltage. Simulations with finite element method software were conducted to compare designs. The results show that the proposed design is less susceptible to the effects of misalignment and is more efficient. Prototype cores were constructed to verify the simulation results. Measurements show a smaller input overcurrent and output overvoltage when operating in resonance mode. The proposed design reduced the effects of coil misalignment on electrical parameters.
Highlights
The adoption of clean energy sources has led to a reduction in the emission of greenhouse gases and will allow greener transportation
For the magnetic field representations, the color gradient has the same range for all models and misalignments
The results are discussed in view of the aim of this work, which was to design a wireless power transfer (WPT) transformer whose output electrical parameters are less sensitive to the effects of misalignment
Summary
The adoption of clean energy sources has led to a reduction in the emission of greenhouse gases and will allow greener transportation. Most mass transport systems (e.g., subways and commuter trains) are powered by electricity, but automobiles powered by internal combustion engines are still dominant for personal transport. To reduce the utilization of personal cars and buses in city centers, cities are installing light rail transit (LRT) systems [1]. LRT has been used since the initial use of electric traction in railways [2], lines have been removed in many cities to make more space for cars, buses, and trucks [3]. LRT uses a small train set that can run on a non-segregated track, where there is no separation between the road and the track, allowing various transportation systems to share the same space [4].
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