In this paper, a 600-km/h-class high-speed train with wheel-rail support and linear synchronous motor (LSM) propulsion system is being considered. Prior to the development of superconducting LSM for trains, preperformance validation through small-scale prototype required. Therefore, 7-kW-class air-core-type was designed, one that includes magnet two poles. High-temperature wire Gd-Ba-Cu-O series used magnet. Next, various characteristics designed model were estimated numerical approach,...

This paper deals with the design and property analysis of 7kW-class small-scaled superconducting Linear Synchronous Motor (LSM) testing equipment for a number performance pre-tests prior to development coreless-type LSM suitable 600㎞/h very high speed train. First, basic are conducted before developing model 2-pole electromagnets, additionally cost-down electromagnets is use less high-Tc wire. Finally, magnet coil span selected at 120㎜, input ground armature current 670Aturns required...

The recent focus on greenhouse gas emissions from fossil fuel usage has led to strengthened regulations carbon emissions. Consequently, research electric vehicles (EV), which have higher energy efficiency compared internal combustion engine vehicles, is actively being pursued. With advancements in the technology of electronic components there a growing trend demand for higher-rated capacities Low DC-DC Converter (LDC) that possess wide input-output voltage range. Furthermore, restricted...

Recently, an interest in a hybrid system combining only the merits of conventional wheel-rail and Maglev propulsion is growing as alternative to high-speed maglev train. This hybrid-type based on method, but it enables overcome speed limitation by adhesion because operated non-contact method using linear motor reduce overall construction costs its compatibility with railway systems. Therefore, design characteristic analysis coreless-type superconducting Linear Synchronous Motor (LSM) for...

As a new concept of energy transmission systems out the existing catenary and pantograph method, Inductive Power Transmission System (IPTS) has been studied on variety applications in field railway recently, but there are still lot technical issues to solve order apply IPTS system large such as high-speed system. For applications, will transfer while train stops at station for around 30 seconds. The airgap is larger than one home appliance coupling coefficient decrease due ; consequently...

Two types of antenna topology are proposed to identify a high speed RFID tag. To the tag, time that tag stays in reading range reader should be longer than backscattering time. Therefore near-field beam width was widened along moving direction The first type is an array and second one traveling wave antenna. Measurement results show both antennas have more wide identification compared with single

A study on the iron-loss reduction of 110kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) for Light Railway Transit (LRT) is conducted in this paper. In general, iron loss IPMSM a value that depends characteristics core material and non-oriented electrical steel used as IPMSM. order to reduce IPMSM, both grain oriented are applied study. The can be reduced approximately 40% comparing existing by applying stator teeth.

This paper presents optimal rotor permanent magnet (PM) and pole-piece skew to improve the total harmonic distortion (THD) of back electromotive force (Back-EMF) in magnetic geared synchronous motor (MG-PMSM) for traction. MG-PMSM is a system that integrates gear PMSM which can minimize size driving reduce power loss because there no mechanical friction unlike existing motor. For this reason, it more advantageous terms output density efficiency. However, has flux modulation, produce...

It is desirable and advantageous to feed parallel propulsion with induction motors by a single voltage source inverter. However, effects of deviation the wheel diameters on motor current, rotor speed torque should be also considered for operation. In order understand behavior characteristics, simple simulation model developed using commercial Matlab Simulink. From results, it clear manage diameter wheels which are connected traction motors.

Recently, the railway and electric vehicle (EV) propulsion system, based on energy-efficient hydrogen-fuel-cell (HFC) battery, has attracted attention. Due to high price of HFC, it is difficult directly supply DC voltage inverter for driving traction motor, a step-up DC-DC converter required between HFC inverter. However, hybrid system more limited space weight compared with general due additional battery. As result, DC/DC high-power-density light-weight required. This paper describes...

레일을 궤도회로로 이용하는 신호 설비의 경우, 레일 주변에 쌓이는 쇠가루는 궤도회로 상에 이상 신호유발의 원인이 되기도 한다. 차량의 곡선 주행 구간에서는 레일과 차륜의 마찰이 심하여 마모에 의한 쇠가루가 발생하게 되고, 이렇게 발생한 상의 쇠가루로 인해 신호가 종종 발생하기 때문에 지하철 운영사의 쇠가루 제거를 위한 방안 마련이 시급한 실정이다. 본 연구에서는 콘크리트 궤도 상 주변의 쇠가루를 포집하기 영구자석 적용 마그넷 포집장치를 소개하였다. 또한 기본 설계 및 수치 해석적 기법을 이용하여 포집장치의 다양한 특성 분석을 수행하였으며, 이를 통하여 궤도상의 포집을 실제 상용노선 차량에의 가능성을 검토하였다. Iron fillings which were accumulated around the rail was often cause of abnormal signal in case signaling equipment using as transmission line....

DC/DC Converter is one of the components electric vehicle (EV) wireless charging system. And inductor occupies a large capacity in DC / converter. It necessary to design reduce size improve power density So recently, coupled applied volume inductor. But it was difficult because unpredictable coupling coefficient plays an important role index when designing In this paper, derived from equation and verified through 3D finite element method (3D-FEM). conclusion, designed using equation. And,...