• Proceedings of the KSR Conference
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• 2000.11a
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• pp.666-673
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• 2000

This paper describes the full load test results of IGBT VVVF inverter for the railway propulsion system. The 1,650kVA IGBT VVVF inverter has been developed. Therefore, the field test is performed in SMG 6 Line to confirm its the reliability and performance. The train consists of 4M4T(4 Motor car 4 Trailer Car) and the electrical equipment for field test are as follows VVVF inverter 4 sets, 16 traction motors and 2 SIVs. The propulsion system is composed with IC4M(1-Controller 4-Motors). The results of propulsion system which have the excellent acceleration/deceleration and the jerk characteristics as well as starting ability on slope are taken through the field test.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.780-785
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• 2007

Korean Train Express (KTX) has opened to commercial traffic since 2004 at maximum speed 300km/h, and Korea High-speed Railway (HSR-350x) was developed by Korean government, several institutes, and related companies. HSR-350x is now being investigated its performance and tested at the high speed line. In 2004 December, HSR-350x was run over 350km/h and proved its running performance. These high speed railways have 12 motors to transfer the traction effort or the braking force. In this paper, authors propose the construction the measurement system for monitoring the force transferred to the train from the motor. The system is installed to the tripod shaft which is located between the reduction gears and it measures the mechanical load directly.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.942-946
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• 2010

As the major sources of interior noise of train at running condition are the wheel/rail contact noise, the traction motor's noise and the driving gear's noise and these noise sources are transmitted through the car body, the noises of HVAC and air duct can be ignored. But the interior noise of train at standstill condition is decided by HVAC's noise and noise from the diffuser through the air duct. the interior noise prediction of train at standstill condition should be performed considering the shape of air duct, the air velocity and noise reduction property inside the air duct. But it is hard to estimate the interior noise level by the numerical method. Therefore train maker predict the interior noise level using The commercial noise prediction program. This paper introduce the noise prediction method of the train at standstill condition using the commercial program appling the ray tracing method and statistical energy analysis.

• Journal of Electrical Engineering and Technology
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• v.10 no.3
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• pp.1035-1047
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• 2015

Starting from a new dynamic system description novel synchronous machine deterministic observers are proposed. Reduced and full order adaptive observer variations are presented. Based on the feedback linearization control law and the use of deterministic observer a novel control system is built. It meets the requirements of high performance tracking system. Adaptivity to stator and rotor resistance and the torque sensorless application is included. The comparison of the proposed novel control with conventional linear and nonlinear control systems is discussed. The given simulational study includes complete drive system integration.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.972-973
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• 2008

본 논문은 3상 2여자 방식의 출력성능을 개선하기 위한 새로운 통전각 확장방식에 관한 연구이다. 제안된 토크제어 방식은 정격토크 이하에서는 기존의 $120^{\circ}$ 통전 PWM 방식으로 토크를 제어하고, 정격토크 이상에서는 출력 증대를 위해 통전각 확장을 통하여 토크를 제어하는 새로운 토크제어 알고리즘을 제안하였다. 또한 PSIM을 이용한 시뮬레이션을 통하여 제안된 방식의 타당성을 검증하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1577-1578
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• 2015

전세계적으로 신재생 에너지를 활용한 기술에 대한 관심이 대두되고 있는 가운데, 국내외에서 활발히 연구 중인 연료전지를 철도차량에 적용하는 연구를 수행하였다. 연료전지를 동력으로 사용하는 철도 차량시스템은 계통에서 전력을 공급받아 구동하는 철도차량과 달리 배터리를 적용한 토폴로지를 사용한다. 배터리는 역행시 철도차량 견인전동기를 구동하거나 회생시 발생되는 전류를 저장한다. 본 논문은 수소연료전지 발전시스템을 적용시 사용되어야하는 배터리 시스템의 충방전 토폴로지에 대해 분석하였다. 견인전동기 역행 및 회생특성을 반영하여 배터리 충방전 토폴로지 적용가능성을 분석하였고 시뮬레이션을 통해 제어 특성을 확인하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.900-901
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• 2015

본 논문은 210kW급 도시철도차량 견인용 IPMSM(Interior Permanent Magnet Synchronous Motor)의 온도포화를 고려할 경우 사마륨 코발트 영구자석($Sm_2CO_{17}$) 사용의 타당성을 검증하는 논문이다. 기존에 설계되고 있는 Nd 자석과 사마륨 코발트 자석을 비교하고 각각의 자석을 사용한 IPMSM의 특성을 비교한다. 온도 시험은 영구자석 감자를 대비하여 사마륨 코발트 자석을 사용하였고, 전동기 각 상 권선의 온도와 고정자 철심의 온도변화를 시간에 따라 측정하여 전동기의 포화온도를 예측 하였다. 이를 바탕으로 전폐형 공랭식 도시철도차량 견인용 IPMSM의 설계모델을 제안한다.

• Journal of the Korean Society of Safety
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• v.21 no.5 s.77
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• pp.34-39
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• 2006

In this paper, we investigated the electric field distribution according to the roughness in aramid insulating paper for electric machine. Aramid insulating paper has been used to electric insulating of the traction motor and generators for large capacity. We studied the electric field distribution using boundary element method for Aramid insulating paper. As a result of simulation, the electric field increased according to the surface roughness existence. Electric field decreased due to radius of surface roughness reduction, and Electric field concentration appeared at electrode boundary and rough surface.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.840-843
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• 2003

The switched reluctance motor(SRM) drive system provides a good adjustable speed and torque characteristics. SRM has the possibility of maintaining full power over a wide speed range. So, many attempts are being done from home appliances to industrial machinery and tools. Especially, a traction drive of an SRM is one of a good application for it's DC-series characteristic. However, because of the switching mechanism, it has some disadvantage of noise and vibration. It is difficult to adopt to an appliance demanding silency. A noise simulation and design of 6/4 and 12/8 SRM was done in order to compare each other was done.

• Proceedings of the KIPE Conference
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• 2003.11a
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• pp.109-112
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• 2003

SRM(switched reluctance motor) provides a excellent adjustable speed and torque characteristics. SRM has the possibility of maintaining full power over a wide speed range. So, many attempts are being done from home appliances to industrial applications. Especially, a traction drive of an SRM is one of a good application for it's DC-series characteristic. However, because of the switching mechanism and reluctance torque, it has some disadvantage Of noise and Vibration. It is difficult to adopt to an appliance demanding silency. A performance and noise tests with 6/4 and 12/8 SRM were done to compare the characteristics.