• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1193-1197
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• 2008

Bridge is Most from stay of Gantry structures part. In compliance with oneself weight of the bridge deflecting, this occurs drops the location precision of the work tool. Also accelerative at the time of gives a serious load to Y axial motors which transfer the bridge damages. The motor with high-speed transfer of location control which is accurate makes disrupt. The malleability of the bridge to maintain consequently and necessary to minimize a weight. This paper the structural FEM interpretations of the stone and the aluminum alloy with the material by which will be used in the bridge and static deflected and a candle precise plane X-Y stage optimal design with character the interpretation result.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.944-949
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• 1998

This paper presents a new high-performance intelligent controlled current-source (CCS) system which can compensate for modelling errors of armature resistance, leakage and magnetizing inductances and for space harmonic components of speed EMF's. A shuttle-motion simulation is presented in the mass-reduced-mode in which an equivalent vehicle weight is reduced, by 40kg to 7kg. This study provides one of the most important key-tech-nologies in driving practical linear synchronous motor (LSM) Maglev vehicle.

• Proceedings of the KIPE Conference
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• 1998.10a
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• pp.17-22
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• 1998

Stator Transient inductance has much influence on rotor flux orientation. In this paper, a new simple on-line tuning scheme of inductances including stator transient inductance for rotor flux orientation control is proposed. Detuned effects caused by inductance variations are shown and simple on-line tuning scheme of them is proposed. Inductances are estimated and tuned by only stator flux and stator current. The proposed scheme is effective in wide speed region including the field weakening region. The proposed on-line tuning scheme is confirmed by the simulation and experiment results.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.667-670
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• 2003

In a switched reluctance motor drive, it is important to synchronize the stator phase excitation with the rotor position, because the position of rotor is an essential information. In the high-speed region, switching angles are fluctuated back and forth out of\ the preset value, which is caused by the sampling period of the microprocessor. In this paper, a low cost analog encoder suitable for practical applications is proposed. The validity of the proposed analog encoder with a proper logic controller is verified from the experiments.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.745-749
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• 2003

The iterative sliding mode observer is proposed to control sensorless PMSM(Permanent Magnet Synchronous Motor). Proposed sliding mode observer has the character which is robust to the disturbance and parameter variation. Low pass filter with the variable cutoff frequency is also proposed to compensate rotor angle, it is led to saving memory and minimizing operation time. Experimental results shows that the proposed sliding mode observer leads to the proper performance.

• Proceedings of the KIPE Conference
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• 2003.11a
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• pp.163-167
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• 2003

본 논문에서는 PWM 펄스를 랜덤하게 위치시킬 수 있는 새로운 3상 공간벡터 RPWM (Random PWM) 기법을 제안하고 있다. 기존의 RPWM 방식과 달리 SVPWM에 의해 발생된 PWM 펄스를 랜덤하게 위치시키는 원리를 각 섹터마다 달리 적용하여 쉽게 RPWM을 구현하는 기법을 제안한다. 제안된 기법의 타당성 검증을 위하여, 제안된 RPWM (Random PWM) 기법 알고리즘에 대해 DSP를 이용한 IGBT 인버터 구성에 의한 실험을 수행하였다. 이에 대한 결과 중, 특히 10000 rpm 이상의 고속운전특성에서의 인버터 출력 전압 및 전류의 고조파 스펙트럼을 넓은 주파수 영역으로 고루 분산시켜 제안된 RPWM의 특정고조파의 저감효과를 입증하고자 한다

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.169-174
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• 2012

Reduction unit is one of the most important components for railway vehicle because torque of motor must be transmitted to wheels of vehicle by reduction unit. However, According to advanced studies, it has been often broke down due to the damage, fatigue and wear of gear. To solve this problem, defect diagnosis methods of gear have been mainly using the vibration diagnosis technology through vibration waveform and frequency analysis. However, We should know vibration characteristics of normal state reduction unit prior to defect diagnosis. So in this paper, We had analyzed vibration characteristics of reduction unit in order to utilize monitoring system development. Comparison of targets is the vibration characteristics of normal state reduction unit about Electric Multiple Unit(EMU) and the High-speed trains(KTX, KTX II).

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.10
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• pp.528-534
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• 2003

A grid connection algorithm is proposed for the doubly-fed induction generator (DFIG) which is widely adopted in high power variable speed wind turbine. Before the stator of DFIG is connected to grid, rotor-side converter is used to control the induced stator voltage. As a result, the stator transient current is limited below the rate value during the connection by the proposed synchronization of the stator voltage to the grid voltage. A wind power generation simulator using DC motor and wound-rotor induction generator is built and the dynamic characteristics of proposed algorithm is verified experimentally.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.907-908
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• 2006

The energy storage systems are being widely researched for the electric power. The operations running in a vacuum chamber mainly consists of a composite flywheel rotor, superconductor bearings, a motor/generator and its controller. Among composed the apparatus, the floating magnet bearing consists of the ring-type permanent magnets with epoxy resin impregnation for reinforcement and surface protection. In order to storage as much energy as possible, the flywheel is supposed to be rotated with very high speed. The magnetic field is analyzed by using the Maxwell 2D/3D for the simulations.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.801-802
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• 2006

본 논문은 기존의 전기강판 재질을 이용한 모터가 아닌 SMC 재질을 이용한 모터 성형 시 발생 될 수 있는 문제점이 모터의 자기적 특성에 미치는 영향에 대해 분석 하였다. 기존의 전기 강판 재질 모터에서 밀도는 전 영역에서 고른 분포를 갖는 반면에, SMC를 이용한 모터는 위치와 형상에 따라 다른 밀도와 응력 분포를 지닌다. 따라서 본 논문에서는 이러한 SMC 재질을 이용한 모터의 특성이 전기적 에너지 변환 과정에 미치는 영향에 대해서 분석 하기위해, 고속모터(30000rpm)급 모터에서 silicon steel 재질 모터와 SMC 재질모터를 비교 하였다. 비교결과 SMC 재질 모터의 경우 밀도 편차가 5.8%이상 발생되었으며 이는 전기적 특성에 10%이상 영향을 미치는 것으로 나타났다. 특히 고속모터의 경우 자속 포화가 심해 일정하게 높은 밑도 특성이 요구 되는 것으로 파악 되었으며, 향후 이 방법은 SMC 재질을 이용한 모터 설계에 유용하게 이용 될 수 있을 것으로 판단된다.