• Title/Summary/Keyword: Induction Motor

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Design and Fabrication of an Ultra-low Partial Discharge Measurement System (극미소 부분방전 측정시스템의 설계 및 제작)

  • Seo, Hwang-Dong;Song, Jae-Yong;Moon, Seung-Bo;Kil, Gyung-Suk;Kwon, Jang-Woo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.208-211
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    • 2005
  • This paper presents an ultra-low partial discharge(PD) measurement system that has been accepted as a non-destructive method to estimate electrical insulation of low-voltage electric devices. The PD measurement system is composed of a coupling network, a low noise amplifier, and associated electronics. A shielding box is used to make a better condition against electromagnetic interference. A low cut-off frequency of the coupling network was 1MHz(-3 dB). Calibration tests on laboratory set-up have shown that the PD measurement system has a stable sensitivity of 11.4mV/pC. In an application experiment on a low-voltage induction motor(5HP), we could detect 0.77pC level of partial discharge pulse at the applied voltage of AC 664 V$_{peak}$.

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Performance Improvement of Reduced Order Extended Luenberger Observer(ROELO) based Sensorless Vector Control Fed by Matrix Converter With Non-linearity Modeling (비선형모델을 이용한 matrix convertor로 구동되는 축소차원 확장 루엔버거 관측기기반의 유도전동기 센서리스 벡터제어의 성능개선)

  • Lee Kyo-Beum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.4
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    • pp.363-372
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    • 2005
  • This paper presents an improved sensorless vector control system for high performance induction motor drives fed by a matrix converter with non-linearity compensation. The nonlinear voltage distortion that is caused by commutation delay and on-state voltage drop in switching devices is corrected by a new matrix converter model. A Reduced Order Extended Luenberger Observer (ROELO) is employed to bring better response in the whole speed operation range and a method to select the observer gain is presented. Experimental results are shown to illustrate the performance of the proposed system.

Design and Implementation of Matrix Converter Based on Space Vector Modulation (SVM를 적용한 매트릭스 컨버터의 설계 및 구현)

  • Yang Chun-Suk;Yoon In-Sik;Kim Kyung-Seo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.6
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    • pp.550-559
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    • 2005
  • The matrix converter provides sinusoidal input and output wave forms, bidirectional power flow, controllable input power factor and a long life, compared to the VSI(Voltage Source Inverter) with diode rectification stage at the input. However it has tasks, such as complexity of the control method, ride-through problem and low voltage-ratio limitation, to overcome for commercializing, This paper describes the design, construction and implementation of matrix converter based on space vector modulation technique. The implemented prototype of matrix converter is built using the exclusive IGBT module and control circuit constituted with DSP and CPLD and it has an input filter, overvoltage protection circuit and commutation means for overcoming practical issues. The good results tested using an induction motor are also presented.

SRM Drive System Using 6-switch IGBT Module (6-Switch IGBT Module을 이용한 SRM 구동 시스템)

  • Kim Yuen-Chung;Yoon Yong-Ho;Lee Won Cheol;Lee Byoung-Kuk;Won Chung-Yuen
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.6
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    • pp.569-577
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    • 2005
  • In this paper, a new control scheme to use 6-switch IGBI module for 3-phase switched reluctance motors(SRM) is proposed. Compared with the conventional asymmetric bridge converter topology, it can minimize the entire system size and cost. Therefore, it may have a new topology lot SRM to compare the other ac motors, such as induction motors, brushless dc motors, and so on. The validity of the proposed method is verified by simulation, and experimental results.

A study on DSP based power analyzing and control system by analysis of 3-dimensional space current co-ordinates (3차원 전류좌표계 해석법에 의한 DSP 전력분석 제어장치에 관한 연구)

  • 임영철;정영국;나석환;최찬학;장영학;양승학
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.4
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    • pp.543-552
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    • 1996
  • The goal of this paper is to developed a DSP based power analyzing and control system by 3-Dimensional (3-D) space current co-ordinates. A developed system is made up of 486-PC and DSP (Digital Signal Processor) board, Active Power Filter, Non-linear thyristor load, and Power analyzing and control program for Windows. Power is analyzed using signal processing techniques based on the correlation between voltage and current waveforms. Since power analysis algorithm is performed by DSP, power analysis is achieved in real-time even under highly dynamic nonlinear loading conditions. Combining control algorithm with power analysis algorithm is performed by DSP, power analysis is achieved in real-time even under highly dynamic nonlinear loading conditions. Combining control algorithm with power analysis algorithm, flexibility of the proposed system which has both power analysis mode and control mode, is greatly enhanced. Non-active power generated while speed of induction motor is controlled by modulating firing angle of thyristor converter, is compensated by Active Power Filter for verifying a developed system. Power analysis results, before/after compensation, are numerically obtained and evaluated. From these results, various graphic screens for time/frequency/3-D current co-ordinate system are displayed on PC. By real-time analysis of power using a developed system, power quality is evaluated, and compared with that of conventional current co-ordinate system. (author). refs., figs. tabs.

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A Diode Bridge-type ZVT Inverter for Induction Motor Drive Applications (유도 전동기 구동용 다이오드 브릿지-타입 ZVT 인버터)

  • 이성룡;고성훈;송인석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.6
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    • pp.561-569
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    • 1999
  • In this paper, the diode bridge-type ZVT(Zero- Voltage Transition) inverter is proposed. It consists of one a auxiliaI${\gamma}$ switch, three resonant inductors and six blockin당 diodes. So, the main advantage of the proposed t torXJ!ogy is the reduction of the auxiliar${\gamma}$ switch compare to the conventional ZVT inverter. The topology of t the propostxl lVT inverter is analyztxl with a description of the control conditions based on the load current. A And the resonant period control for operating the proposed inverter optimally is discussed by using resonant i inductor current ftxxlback. To verify the proposed topology, the detailed simulation and exJX끼mental results i indicate that zero volta당e operation during transition can be achieved.

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A Study of the Operation Characteristics of the Resonant Dual Converters (공진형 듀얼컨버터의 동작특성에 관한 고찰)

  • 양승학
    • The Transactions of the Korean Institute of Power Electronics
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    • v.2 no.4
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    • pp.1-10
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    • 1997
  • Resonant dual converters are remarkable as circuit topologies that can realize a power conversion on the high switching frequency with low switching loss. In this paper, bi-directional resonant power conversion system is established, which makes the powering and the regeneration possible, by loading an induction motor. For its practical use, the operation characteristics of the system are to be examined through a series of experiments. The characteristics are : (l)input/output, (2)resonants. (3)tum-off and zero voltage in the main devices and clamp device. By examining the measured waveforms, this study will investigate some problems in the system, and also give some suggestions for a further study.

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The Optimization Design of Rotor Slot Shape in Outer-Rotor Type Induction Motor Reducing Unbalance Force (외전형 유도전동기의 불균형력 저감을 위한 회전자 슬롯형상 최적화)

  • Kim, Kyung-Su;Cha, Hyun-Rok;Yun, Cheol-Ho;Jung, Tae-Uk;Park, Seong-Jun
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.864-865
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    • 2007
  • 외전형 유도전동기는 내전형에 비해 회전자가 외부에 존재하는 특징을 가지고 있어서 제품의 소형화 및 경량화를 시킬 수 있다는 장점이 있다. 하지만 외전형은 회전자의 직경이 내전형에 비하여 크기 때문에 조립 공정상에 존재하게 되는 회전자와 고정자간의 이심률에 따른 제품 전체의 불균형력이 상대적으로 크며, 이로 인해 모터의 정속적인 운전 방해 및 불규칙한 출력토크로 인한 제품 작동상의 오류발생이 더 크게 나타난다. 본 논문에서는 외전형 유도전동기에서 존재하는 이심률의 크기에 따른 불균형력이 최소화 될 수 있는 슬롯형태를 찾기 위해 회전자 슬롯의 형태를 전폐형, 반폐형, 개구형태의 3가지형태로 변경시킨 후, 이를 전자장 해석을 통해 불균형력을 비교하였다. 또한 이심률이 증가함에 따라 나타나는 불균형력의 증대를 슬롯 형태에 따라 비교 분석하여, 불균형력에 최적화된 외전형 모터의 슬롯형태를 알아보았다.

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Surge Characteristics Analysis of Three-phase Virtual Chopping at Vacuum Circuit Breaker (진공차단기 3상 동시 차단시의 서지 특성 분석)

  • Kim, Jong-Gyeum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.9
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    • pp.1159-1164
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    • 2018
  • Vacuum circuit breakers(VCB) are widely used for current interruption of high-voltage inductive loads such as induction motors. This VCB can be chopped off before the current zero due to its high arc-extinguishing capability. One of the outstanding features of VCB is that it can cut off high frequency re-ignition current more than other circuit breakers. If the transient recovery voltage generated in the arc extinguishing is higher than the dielectric strength of the circuit breaker, a re-ignition phenomenon occurs. The surge voltage of the re-ignition is very high in magnitude and the steepness of the waveform is so severe that it can act as a high electrical stress on the winding. If the high frequency current of one phase affects the other two phases when the re-ignition occurs, it may cause a high surge voltage due to the virtual current chopping. If the magnitude of the voltage allowed in the motor winding is high or the waveform level is too severe, it may lead to insulation breakdown. Therefore, it is necessary to reduce the voltage to within a certain range. In this study, we briefly explain the various phenomena at the time of interruption, analyzed the magnitude of the dielectric strength and the transient recovery voltage at the simultaneous three-phase interruption that can give the greatest influence to the inductive load, proposed a method to reduce the impact.

Analyzable System for Characteristics of Inverter by the using DSP (DSP를 이용한 인버터 특성분석 시스템)

  • 박진홍;류희삼;이종규;이성백
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.12 no.4
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    • pp.75-80
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    • 1998
  • In this paper, the real time characteristics analyzing system is proposed to analyze characteristics of inverter. The system is consisted of DSP unit and personal computer. Conventionally, power conversion system is designed by the load and the use. And control characteristics for the designed power conversion system is evaluated by the control input. In order to study of control methods, power conversion system is required for a study of control methods and observed system is required for a analyzing of the inverter. Inverter system is consisted to evaluate for proposed real time characteristics analyzing system. And induction motor is driven by control input that is manufactured by personal computer. Output of inverter and control characteristics is variously analyzed.

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