• Title/Summary/Keyword: direct system

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A PMSM Motion Control System with Direct Torque Control (직접토크제어에 의한 PMSM의 위치제어 시스템)

  • 김남훈
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.615-619
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    • 2000
  • This paper presents an implementation of digital motion control system of Surface Permanent-Magnet Synchronous Motor(SPMSM) vector drives with a direct torque control(DTC) using the 16bit DSP TMS320F240 The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent control for motors which can be yield enhanced operation fewer system components lower system cost increased efficiency and high performance The system presented are stator flux and torque observer of stator flux feedback model that inputs are current and voltage sensing of motor terminal and angle for a low speed operating area two hysteresis band controllers an optimal switching look-up table and IGBT voltage source inverter by using fully integrated control software. The developed control system are shown a good motion control response characteristic results and high performance features using 1.0Kw purposed servo drive SPMSM.

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A Comparative Study on FTA Verification System Among Korea vs USA, EU (한국과 미국, EU의 FTA협정 상 원산지검증에 대한 비교연구)

  • Kim, Man Gil;Chung, Jae Wan
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.58
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    • pp.267-286
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    • 2013
  • Origin verification is regarded most essential for FTA performance administration. This administration is divided into direct and indirect system where Korea has adapted indirect system to Korea-EU FTA while direct system to Korea-USA FTA. A comparative analysis was conducted on the system of origin verification and provisions contained in preferential tariff law of each countries. The study finds that Korean origin verification system is a bit lack of procedural provision resulting in less protection of domestic trader's rights. Another point is that Korean Customs Authority is weak, in respect of organization and man power, to protect illegal bilateral tariff application by counter part FTA countries. And therefore this study suggests the policy makers to arrange detailed FTA origin verification procedures with earliest meeting with counter part FTA countries, and further stress that make up of organization and man power for origin verification in a timely manner.

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An Induction Motor Control System with Direct Torque and Flux Control (직접 토크 및 자속제어에 의한 유도전동기 제어시스템)

  • Kim, Min-Huei;Kim, Nam-Hun;Kim, Min-Ho
    • Proceedings of the KIEE Conference
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    • 2000.07e
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    • pp.79-84
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    • 2000
  • This paper presents an implementation of digital position control system for an induction motor vector drives by a direct torque control(DTC) using the 16bit DSP TMS320 F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controller for motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are stator flux and torque observer using current model that inputs are current sensing of motor terminal and rotor angle for a low speed operating area, two hysteresis controller, optimal switching look-up table, and IGBT voltage source inverter by fully integrated control software. The developed control system are shown a good motion control response characteristic results and high performance features using 2.2Kw general purposed induction motor.

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Performance of a digital PN Sequence Acquisition System (디지털 PN 초기 동기장치의 성능)

  • Kim, Yun-Gwan;Eun, Jong-Gwan;Ryu, Seung-Mun
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.21 no.6
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    • pp.105-114
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    • 1984
  • A fast pseudo-noise (PN) sequence acquisition algorithm for the direct-sequence (DS) spread spectrum system is proposed. The basic concept of the algorithm has been adopted from that of the classical sliding correlator. Mathematical modeling, analysis and computer simulation of the proposed system have been done. The results of analysis and computer simulation show that the acquisition system yields a significant performance improvement over the sliding correlator. Its acquisition time takes only 45 ms when signal-to-noise ratio(SNR) is -18dB. The algorithm developed has been implemented in hardware and its experimental result is also given.

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Implementation and the Energy Efficiency of the Kinetic Shading System (가동형 차양 시스템의 구성과 에너지 효율)

  • Han, Seung-Hoon
    • KIEAE Journal
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    • v.14 no.5
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    • pp.67-73
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    • 2014
  • This study aims at examining kinetic efficient shading systems and their implementation methods. These days, the importance of the shading devices are getting more significant due to the energy problem. Cordially, suitable shade designs are required as an important element for the exterior envelope of the building. This study employs the optimal shading design as an efficient shading method with the kinetic system that can be converted actively by the altitude of the sun. The proposed kinetic shading system works not only as a lightshelf in case the altitude of the sun is high but also as a vertical louver when the sun is getting lower in order to block the direct sunlight. This study has analyzed the thermal performance and shading coefficient of the kinetic shading system in comparison to existing fixed shading devices using the Ecotect. The results, in sum, conclude that the suggested kinetic shading system could decrease direct sunlights 26.2% more than the existing shading methods.

An Induction Motor Motion Control System with Direct Torque Control (직접 토크제어에 의한 유도전동기의 위치제어 시스템)

  • Kim, Nam-Hun;Kim, Min-Ho;Kim, Dong-Hee;Kim, Min-Huei
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.1036-1038
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    • 2000
  • This paper presents an implementation of digital motion control system of induction motor vector drives with a direct torque control(DTC) using the 16bit DSP TMS 320F240. The DSP controller enable enhanced real time algorithm and cost-effective design of intelligent controllers for induction motors which can be yield enhanced operation, fewer system components, lower system cost, increased efficiency and high performance. The system presented are stator flux observer of current model that inputs are current sensing of motor terminal and rotor angle, and optimal switching look-up table by using fully integrated control software. The developed system are shown a good motion control response characteristic results and high performance features using 2.2Kw general purposed induction motor.

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A Proposal for Developing a Situated Learning Support Systems-Based on an MMORPG

  • PIAO, Cheng Ri
    • Educational Technology International
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    • v.6 no.2
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    • pp.59-67
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    • 2005
  • The primary purposes of this study are to develop a Situated Learning Support System based on an MMORPG (Massively Multiplayer Online Role Playing Game) and to investigate applications of Situated Learning theory both hypothetically and practically. In Situated Leaning theory, cognition is interpreted as a dynamic system related to situation, context and activity. According to this theory, learning context, social interaction and personal direct experience are also emphasized. A virtual reality learning system based on an MMORPG provides context, social interaction and a learning environment able to provide direct experiences. However, such a system has been difficult for teachers to develop. This study aims to develop a support system facilitating the construction of a Situated Learning System based on an MMORPG. This study proposes new research and practical applications of Situated Learning theory using educational games.

Direct Torque Control System of a Reluctance Synchronous Motor Using a Neural Network

  • Kim Min-Huei
    • Journal of Power Electronics
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    • v.5 no.1
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    • pp.36-44
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    • 2005
  • This paper presents an implementation of high performance control of a reluctance synchronous motor (RSM) using a neural network with a direct torque control. The equivalent circuit in a RSM, which considers iron losses, is theoretically analyzed. Also, the optimal current ratio between torque current and exiting current is analytically derived. In the case of a RSM, unlike an induction motor, torque dynamics can only be maintained by controlling the flux level because torque is directly proportional to the stator current. The neural network is used to efficiently drive the RSM. The TMS320C3l is employed as a control driver to implement complex control algorithms. The experimental results are presented to validate the applicability of the proposed method. The developed control system shows high efficiency and good dynamic response features for a 1.0 [kW] RSM having a 2.57 ratio of d/q.

Effects of the Methanol Concentration, Wind Velocity and Stack Temperature on the performance of Direct Methanol Fuel Cell (직접 메탄올 연료 전지의 성능에 대한 메탄올 농도, 풍속 및 스택 온도의 영향)

  • Kim, Yong-Ha;Kim, Seok-Il
    • Journal of Aerospace System Engineering
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    • v.1 no.2
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    • pp.21-26
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    • 2007
  • DMFC(Direct Methanol Fuel Cell) has been considered as an attractive option to produce electric power in many application. In this study, in order to estimate the effects of the methanol concentration, wind velocity and temperature on the performance of DMFC, a physical prototype of DMFC was designed and manufactured, and the stack voltage of DMFC was measured during the operation of DMFC. Expecially, the experimental results showed that a low stack temperature, a low wind velocity and an excess methanol concentration lead to the increase of the time to reach the maximum stack voltage.

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Robust Multiloop Controller Design of Uncertain Affine TFM(Transfer Function Matrix) System (불확실한 Affine TFM(Transfer Function Matrix) 시스템의 강인한 다중 루프 제어기 설계)

  • Byun Hwang-Woo;Yang Hai-Won
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.1
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    • pp.17-25
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    • 2005
  • This paper provides sufficient conditions for the robustness of Affine linear TFM(Transfer Function Matrix) MIMO (Multi-Input Multi-Output) uncertain systems based on Rosenbrock's DNA (Direct Nyquist Array). The parametric uncertainty is modeled through a Affine TFM MIMO description, and the unstructured uncertainty through a bounded perturbation of Affine polynomials. Gershgorin's theorem and concepts of diagonal dominance and GB(Gershgorin Bands) are extended to include model uncertainty. For this type of parametric robust performance we show robustness of the Affine TFM systems using Nyquist diagram and GB, DNA(Direct Nyquist Array). Multiloop PI/PB controllers can be tuned by using a modified version of the Ziegler-Nickels (ZN) relations. Simulation examples show the performance and efficiency of the proposed multiloop design method.