• Title/Summary/Keyword: Conventional induction motor

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New Optimal PWM Scheme for Minimizing the Harmonic Effects of VSI-PWM Inverter (VSI-PWM 인버터의 고주파 영향을 최소화하기 위한 새로운 Optimal PWM 방식)

  • 이윤종;이일형;정동화
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.15 no.11
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    • pp.886-897
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    • 1990
  • This paper is proposed new optimal PWM scheme is based on a defined linear relationship between the successive pulsewidths of the PWM pattern. The calculation of the pulsewidths in the new PWM scheme is caried out without referring to the equations of CW and MW. With this scheme the PWM pattern for microprocessor controlled inverters can be composed easily by obtaining the optimal increment in sucessive pulsiwidths of the pattern. Furthmore, the harmonic level at the output of PWM inverter are always very low because this PWM pattern is selected on the basis of minimum THD. Theis scheme is applied to 1(Hp), three phase induction motor, and compared with conventional regular PWM scheme. The results of calculations and experiments show that new optimal PWM scheme could provide an effective generalized approach for minimization of harmonics in the VSI-PWM inverter.

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Thrust Characteristics Analysis considering the effect of the loops of flux in a LIM for Railway Transit (맴돌이 자속의 영향을 고려한 철도차량용 선형유도전동기의 추력 특성 연구)

  • Park, Chan-Bae;Lee, Hyung-Woo;Han, Kyung-Hee;Lee, Byung-Song;Kwon, Sam-Young;Park, Hyun-June
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1605-1609
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    • 2007
  • In the case of Linear induction motor(LIM), numerical analysis method like Finite Element Method(FEM) has been mainly used to analyze the travelling magnetic field problem which includes the velocity-induced electromotive force. If the problem including the velocity-induced electromotive force is analyzed by FEM using Galerkin method, the solution can be oscillated according to Peclet Number, which is determined by conductivity, permeability, moving velocity and size of mesh. Consequently, the accuracy of the solution can be low and the Loops of flux can be occurred at the secondary back-iron. These loops of flux occurred at the secondary back-iron does not exist physically, but it can be occurred in the analysis. In this case, the loops of flux can be generally removed by using Up-Wind method which is impossible to apply a conventional S/W tool(Maxwell 2D). Therefore, in this paper, authors examined the Loops of flux occurred at the secondary back-iron of LIM according to variations of Peclet Number, and analyzed whether these loops of flux affect on the thrust force characteristics of LIM or not.

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Performance Evaluation of Various Bus Clamped Space Vector Pulse Width Modulation Techniques

  • Nair, Meenu D.;Biswas, Jayanta;Vivek, G.;Barai, Mukti
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1244-1255
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    • 2017
  • The space vector pulse width modulation (SVPWM) technique is a popular PWM method for medium voltage drive applications. Conventional SVPWM (CSVPWM) and bus clamped SVPWM (BCSVPWM) are the most common SVPWM techniques. This paper evaluates the performance of various advanced BCSVPWM strategies in terms of their harmonic distortion and switching loss based on a uniform frame work. A uniform frame work, pulse number captures the performance parameter variations of different SVPWM strategies for various number of samples with heterogeneous pulse numbers. This work compares different advanced BCSVPWM techniques based on the modulation index and location of the clamping position (zero vector changing angle ) of a phase in a line cycle. The frame work provides a fixed fundamental frequency of 50Hz. The different BCSVPWM switching strategies are implemented and compared experimentally on a 415V, 2.2kW, 50Hz, 3-phase induction motor drive which is fed from an IGBT based 2 KVA voltage source inverter (VSI) with a DC bus voltage of 400 V. A low cost PIC microcontroller (PIC18F452) is used as the controller platform.

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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Technique of Common Mode Voltage and Conducted EMI Reduction using Nonzero-vector State in SVPWM Method (SVPWM방식에서의 영벡터 제거에 의한 커먼모드 전압 및 전도성 EMI 저감 기법)

  • Hahm Nyon-Kun;Kim Lee-Hun;Jeon Kee-Young;Chun Kwang-Su;Won Chung-Yuen;Han Kyung-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.5
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    • pp.507-515
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    • 2004
  • With the advent of fast power devices, the high dv/dt voltage produced by PWM inverts have been found to cause EMI noise, shaft voltage and bearing current. This paper describes the application of newly developed Conducted EMI reduction SVPWM technique in induction motor drives. The newly developed common mode voltage reduction SVPWM technique don't use any zero-vector states for inverter control, hence it can restrict the common mode voltage more than conventional PWM technique. The validity of the proposed technique by software approach is verified through simulation and experimental results.

High Gain Observer-based Robust Tracking Control of LIM for High Performance Automatic Picking System (고성능 자동피킹 시스템을 위한 선형 유도 모터의 고이득 관측기 기반의 강인 추종 제어)

  • Choi, Jung-Hyun;Kim, Jung-Su;Kim, Sanghoon;Yoo, Dong Sang;Kim, Kyeong-Hwa
    • Journal of the Korean Institute of Intelligent Systems
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    • v.25 no.1
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    • pp.7-14
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    • 2015
  • To implement an automatic picking system (APS) in distribution center with high precision and high dynamics, this paper presents a high gain observer-based robust speed controller design for a linear induction motor (LIM) drive. The force disturbance as well as the mechanical parameter variations such as the mass and friction coefficient gives a direct influence on the speed control performance of APS. To guarantee a robust control performance, the system uncertainty caused by the force disturbance and mechanical parameter variations is estimated through a high gain disturbance observer and compensated by a feedforward manner. While a time-varying disturbance due to the mass variation can not be effectively compensated by using the conventional disturbance observer, the proposed scheme shows a robust performance in the presence of such uncertainty. A Simulink library has been developed for the LIM model from the state equation. Through comparative simulations based on Matlab - Simulink, it is proved that the proposed scheme has a robust control nature and is most suitable for APS.

A Study on the Design of Single Phase Cycloconverter by Cosine Wave Crossing Control Method (코사인 점호방식에 의한 단상 싸이클로콘버터의 설계에 관한 연구)

  • 김시헌;안병원;노창주
    • Journal of Advanced Marine Engineering and Technology
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    • v.17 no.5
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    • pp.71-85
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    • 1993
  • The Cycloconverter that the author is going to treat in this paper, has strong advantages over the D.C. Link Inverter in points of chattering torque problem and natural commutation. Thus, the Cycloconverter is expected to be well applied to large and low-speed machines which require better speed control at low frequency. But the control circuit of Cycloconverter has two weak points described as follows. 1) Because of its rather complicated control circuit, it is likely to be illoperating due to unexpected noise signals, thus the higher the accuracy and reliability of the circuit is required to be, the more the circuit may cost. 2) Because the load current is not purely sinusoidal, the Cycloconverter may possibly be destroyed in case of inaccurate convert switching resulted from the difficulties in detecting the load current-zero and the current direction at the moment. In this paper, the author first of all intends to design and build a modified VVVF-type Noncirculating Current Cycloconverter to which recently proposed control methods are applied for improving the circuit simplicity, the control performance, and the system reliability. And then, experiments for observing the output waveforms of the Cycloconverter which is controlled by Singled-Board Computer using 8086 16-bit microprocesser are carried out. Finally the author concludes the result of this study as follows. 1) By replacing the conventional analog control circuits such as Reference Wave Generator, Cosine Timing Wave Generator, and Comparator with softwares, a great circuit simplicity is achieved. 2) The output of the designed Cycloconverter changes its frequency very fast without showing discontinuity of its waveform, and this waveform characteristics enables the smooth speed control of Induction Motor. 3) The design control circuit of Cycloconverter can be applied to the systems of 12 or 24 pulses because of its short processing period.

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