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An ultraslim S-type power supply rail, which has a width of only 4 cm, for roadway-powered electric vehicles (RPEVs) is proposed in this paper. The cross section of the core has a thin S-shape, and a vertically-wound multiturn coil is displaced inside the core. In this way, the most slim power supply rail is designed, which is crucial for the commercialization of RPEVs. The construction of roadway infrastructure, which is responsible for more than 80% of the total deployment cost for RPEVs, can be much easier when the width of the power supply rail is so small. To increase portability and to minimize construction time, a foldable power supply module is also proposed in which flexible power cables connect each foldable power supply module such that no connectors are needed during deployment. An effective winding method for minimizing the cable length is proposed, and an optimum core thickness of the proposed power supply rail is determined by FEA simulations and verified by a prototype power supply module. By virtue of the ultraslim shape, a large lateral displacement of 30 cm at an air gap of 20 cm was experimentally obtained, which is 6 cm larger than that of the I-type power supply rail. In addition to the larger lateral displacement, it is estimated that the S-type one has lower EMF than the I-type one because the width of the S-type one is narrower than that of I-type one. The maximum efficiency, excluding the inverter, was 91%, and the pick-up power was 22 kW.Index Terms-Foldable power supply module, inductive power transfer system (IPTS), roadway-powered electric vehicle (RPEV), S-type power supply rail.

Abstract-A narrow-width power invariant inductive power transfer system (IPTS) along the driving direction is newly proposed in this paper. The conventional I-type power supply rail for on-line electric vehicles (OLEVs) has a very narrow power supply rail with 10cm width and exposes pedestrians to a very low electro-magnetic field due to its alternatively arranged magnetic poles along the driving direction of electric vehicles; however, it has a major drawback: sinusoidal variation of the induced pickup voltage depending on pick-up positions on the power supply rail along driving direction. To overcome this disadvantage, a dqpower supply rail fed by two high frequency AC currents of the dphase and q-phase is introduced in this paper. The d-phase and qphase magnetic poles are alternatively arranged in a line; hence, the induced voltage of a pick-up becomes spatially uniform. The power invariant characteristic of the proposed IPTS for OLEV has been verified by analysis, simulations, and experiments. A practical winding method is suggested, as well.Index Terms-wireless power; IPTS; inductive coupling, dqpower supply rail, on-line electric vehicle R Changbyung Park is with

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