Evaluation of a non-contact power supply system with a figure-of-eight coil for railway vehicles

Ukita, Keigo; Kashiwagi, Takayuki; Sakamoto, Yasuaki; Sasakawa, Takashi

doi:10.1109/wow.2015.7132807

Cited by 27 publications

(6 citation statements)

References 2 publications

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“…Energies 2018, 11,1970 6 of 25 and (15) in which J 1 is the Bessel function of the first kind. Previous studies [28,33,34] presented analytical solutions for the inductance calculations for their respective specific configurations, and proposed an integral calculation that is faster and easier compared to FEM, not the scope of this work.…”

Section: Magnetic Analysismentioning

confidence: 99%

“…The designs differ in terms of the type of transformer shape and the operation. For WPT systems in which energy transfer occurs when the train is running or stopped, the primary coil design tends to have one or two very long turns occupying the whole space of the traction section [14][15][16][17][18] and ferromagnetic materials are positioned along the section to ensure the uniformity of the generated magnetic field. Different designs optimize different parameters, such as weight, power transfer, and loss reduction.…”

Section: Introductionmentioning

confidence: 99%

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Increase in Robustness against Effects of Coil Misalignment on Electrical Parameters Using Magnetic Material Layer in Planar Coils of Wireless Power Transfer Transformer

Dias

Miyatake

2018

Energies

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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.

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Section: Magnetic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increase in Robustness against Effects of Coil Misalignment on Electrical Parameters Using Magnetic Material Layer in Planar Coils of Wireless Power Transfer Transformer

Dias

Miyatake

2018

Energies

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“…Consequently, in order to apply a coreless-type ground power feeding line to WPT model, a derivation of an appropriate secondary pickup structure is necessary [36]. [37].…”

Section: B Magnetic Coupling and The Ipt Model For Rail Transitmentioning

confidence: 99%

Advances in inductively coupled power transfer technology for rail transit

Shi

Yin

Jiang

et al. 2017

Trans. Electr. Mach. Syst.

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Traditional power supply method for moving electric railway vehicles is based on contact type power collection technology. This sometimes cannot meet the requirements of modern rail transportation. A new wireless power transfer (WPT) technology can offer significant benefits in modern rail transportation particularly in some stringent environments. This paper reviews the status and the development of rail transit power supply technology, and introduces a new challenging technology-inductive power transfer (IPT) technology for rail transit. Tesla established the underpinning of IPT technology and creatively and significantly demonstrated power transfer by using highly resonant tuned coils long time ago. However, only in recent years the IPT technology has been significantly improved including the transfer air-gap length, transfer efficiency, coupling factor, power transfer capability and so on. This is mainly due to innovative semiconductor switches, higher control frequency, better coil designs and high performance material, new track and vehicle construction techniques. Recent advances in IPT for rail transit and major milestones of the developments are summarized in this paper. Some important technical issues such as coupling coil structures, power supply schemes, segmentation switching techniques for long-distance power supply, and bidirectional IPT systems for braking energy feedback are discussed. Index Terms-Bidirectional energy transfer, inductive power transfer (IPT), magnetic coupling, rail transit, segmented power supply, wireless power transfer (WPT).

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“…The transmitters are long bipolar coils, and "figure-8" coils are used as the matching pickups as shown in Figure 6. The system is able to transfer 50 kW of power across a 7.5-mm gap with 10-kHz frequency [6]. Bombardier Primove from Germany is currently leading in WPT technology for EV and ET.…”

Section: Introductionmentioning

confidence: 99%

A Review of Dynamic Wireless Power Transfer for In‐Motion Electric Vehicles

Song¹,

Koh²,

Zhu³

et al. 2016

Wireless Power Transfer - Fundamentals and Technologies

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Dynamic wireless power transfer system (DWPT) in urban area ensures an uninterrupted power supply for electric vehicles (EVs), extending or even providing an infinite driving range with significantly reduced battery capacity. The underground power supply network also saves more space and hence is important in urban areas. It must be noted that the railways have become an indispensable form of public transportation to reduce pollution and traffic congestion. In recent years, there has been a consistent increase in the number of high-speed railways in major cities of China, thereby improving accessibility. Wireless power transfer for train is safer and more robust when compared with conductive power transfer through pantograph mounted on the trains. Direct contact is subject to wear and tear; in particular, the average speed of modern trains has been increasing. When the pressure of pantograph is not sufficient, arcs, variations of the current, and even interruption in power supply may occur. This chapter provides a review of the latest research and development of dynamic wireless power transfer for urban EV and electric train (ET). The following key technology issues have been discussed: (1) power rails and pickups, (2) segmentations and power supply schemes, (3) circuit topologies and dynamic impedance matching, (4) control strategies, and (5) electromagnetic interference.

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Evaluation of a non-contact power supply system with a figure-of-eight coil for railway vehicles

Cited by 27 publications

References 2 publications

Increase in Robustness against Effects of Coil Misalignment on Electrical Parameters Using Magnetic Material Layer in Planar Coils of Wireless Power Transfer Transformer

Increase in Robustness against Effects of Coil Misalignment on Electrical Parameters Using Magnetic Material Layer in Planar Coils of Wireless Power Transfer Transformer

Advances in inductively coupled power transfer technology for rail transit

A Review of Dynamic Wireless Power Transfer for In‐Motion Electric Vehicles

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