• Title, Summary, Keyword: Single-phase

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The Design of Rotor Bars of Single-Phase Line-Start Permanent Magnet Motor for Improving Starting Characteristics (단상 유도동기전동기의 기동 특성 개선을 위한 회전자 바 형상 설계)

  • Lee Chul-kyu;Kwon Soon-hyo;Yang Byung-yull;Kwon Byung-il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.8
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    • pp.370-376
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    • 2005
  • The single-phase induction motor is simple and durable, but the efficiency is low. Therefore, electric motors like HLDC and LSPM(line-start permanent magnet motor) that use the permanent magnet have been studied. The most advantages of single-phase LSPM is having the same stator as the stator of the single-phase induction motor and permanent magnets are just inserted in the squirrel cage rotor of the single-phase induction motor. But the characteristics of single-phase LSPM synchronous motor has very complex characteristics until the synchronization and if the design is not suitable, the single-phase LSPM synchronous motor cannot be synchronized. We designed a single-phase LSPM using the same stator and winding as the conventional single-phase induction motor, but newly designed the permanent magnets considering air gap magnetic flux density. The transient characteristics of the single-phase LSPM is not good because of a magnetic breaking torque, however, it can be improved by redesigning the rotor bars. We are proposed the design method of rotor bar for the single-phase LSPM to start softly and to make synchronization easily.

Single-phase Active Power Filter Based on Rotating Reference Frame Method for Harmonics Compensation

  • Kim, Jin-Sun;Kim, Young-Seok
    • Journal of Electrical Engineering and Technology
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    • v.3 no.1
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    • pp.94-100
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    • 2008
  • This paper presents a new control method of single-phase active power filter (APF) for the compensation of harmonic current components in nonlinear loads. To facilitate the possibility of complex calculation for harmonic current detection of the single phase, a single-phase system that has two phases was constructed by including an imaginary second-phase giving time delay to the load current. The imaginary phase, which lagged the load current T/4 (Here T is the fundamental cycle) is used in the conventional method. But in this proposed method, the new signal as the second phase is delayed by the filter. Because this control method is applied to a single-phase system, an instantaneous calculation was developed by using the rotating reference frames synchronized to source-frequency rather than by applying instantaneous reactive power theory that uses the conventional fixed reference frames. The control scheme of single-phase APF for the current source with R-L loads is applied to a laboratory prototype to verify the proposed control method.

Static VAR Compensator-Based Voltage Regulation for Variable-Speed Prime Mover Coupled Single- Phase Self-Excited Induction Generator

  • Ahmed, Tarek;Noro, Osamu;Sato, Shinji;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.3 no.3
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    • pp.185-196
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    • 2003
  • In this paper, the single-phase static VAR compensator (SVC) is applied to regulate and stabilize the generated terminal voltage of the single-phase self-excited induction generator (single-phase SEIG) driven by a variable-speed prime mover (VSPM) under the conditions of the independent inductive load variations and the prime mover speed changes The conventional fixed gain PI controller-based feedback control scheme is employed to adjust the equivalent capacitance of the single-phase SVC composed of the fixed excitation capacitor FC in parallel with the thyristor switched capacitor TSC and the thyristor controlled reactor TCR The feedback closed-loop terminal voltage responses in the single-phase SEIG coupled by a VSPM with different inductive passive load disturbances using the single-phase SVC with the PI controller are considered and discussed herem. A VSPM coupled the single-phase SEIG prototype setup is established. Its experimental results are illustrated as compared with its simulation ones and give good agreements with the digital simulation results for the single-phase SEIG driven by a VSPM, which is based on the SVC voltage regulation feedback control scheme.

Characteristic Study on Single to Three Phase Conversion Using Single Phase Inverter (단상 Inverter를 사용한 단상/3상 상변환기구와 그 특성에 관한 연구)

  • 이승원;남부희
    • 전기의세계
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    • v.27 no.3
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    • pp.47-52
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    • 1978
  • This paper deals with the phase converter. The single-phase inverter with 120.deg.C phase-lagging is used for the phase conversion. As the waveform of the inverter is rectangular, the output waveforms of the three-phase lines include the harmonics. Single-phase operation by using phase converter and three-phase balanced operation of the three-phase induction motor are compared, and the effects of the harmonics are analyzed and discussed.

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A NEW SINGLE-PHASE Z-SOURCE CYCLOCONVERTER

  • Khai, Nguyen Minh;Jung, Young-Gook;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • pp.318-320
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    • 2007
  • Single-phase cycloconverters are widely used for ac-ac power conversion especially for speed control of ac drives. In this paper, a new single-phase to single-phase Z-source cycloconverter topology is proposed. The proposed single-phase Z-source cycloconverter can boost to a desired voltage with various frequency. Thus, it is called a frequency step-down and amplitude voltage step-up converter. The operating principle of the proposed topology is presented. Analysis and simulation for this single-phase Z-source cycloconverter are also presented.

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Analysis of Reduction Effect of Three Harmonic Currents by Zigzag Wiring of Single Phase Transformer (단상 변압기 지그재그 결선에 의한 3고조파 전류 저감 효과 분석)

  • Kim, Jong-Gyeum;Kim, Ji-Myeong
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.66 no.3
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    • pp.99-104
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    • 2017
  • The three-phase four-wire power distribution system can be used to supply power to single-phase and three-phase loads at the same time. There are linear loads and nonlinear loads as single-phase loads connected to each phase. The nonlinear load generates a harmonic current during the power energy conversion process. In particular, the single-phase nonlinear load has a higher proportion of generation of the third harmonic current than the harmonics of the other orders. In a three-phase four-wire system, the third harmonic current flows through the neutral wire to the power supply side, affecting the power supply side and the line. Furthermore, the magnitude of the current flowing in the neutral line can be higher than the current flowing in the individual phase. If the neutral current is higher than the phase current, the breaker may be blocked. Therefore, it is necessary to reduce the amount of current flowing in the neutral line by harmonics. There is a method of zigzag connecting a single phase transformer by a method of reducing 3 harmonic current. In this study, the method of reducing the magnitude of the three harmonic currents flowing through the zigzag wire by comparing the polarity and the negative polarity characteristics of the single phase transformer was compared through measurement and simulation.

Study on Losses Segregation for Capacitor-Run Single Phase Induction Motor (커패시터 구동형 단상유도전동기의 손실분리에 대한 연구)

  • Kim, Kwang-Soo;Kim, Ki-Chan;Lee, Sung-Gu;Go, Sung-Chul;Chun, Yon-Do;Lee, Chul-Kyu;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1546-1551
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    • 2008
  • This paper is concerned with the problems of accurate losses segregation in capacitor-run single phase motor. Segregation of losses in single phase induction motor is more complicated than that in three phase induction motor, because of the backward magnetic field component in the motor. Generally there are two methods for losses segregation of single phase induction motor. The one is relatively complicated method based on parameter estimation of single phase induction motor. By the way, the other one is simplified method based on IEEE Standard 114. All of the methods for the experimental determination of single phase induction motor losses are studied in this paper. Since the IEEE Standard is not possible to be applied for all type of single phase induction motors, we modified that method to apply for losses segregation of capacitor-run single phase induction motor as unifying the method based on parameter estimation.

Study of Losses segregation for Capacitor-Run Single phase Induction Motor (커패시터 구동형 단상 유도전동기의 손실분리 연구)

  • Kim, Kwang-Soo;Kim, Ki-Chan;Lee, Sang-Hoon;Lee, Ju
    • Proceedings of the KIEE Conference
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    • pp.16-18
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    • 2008
  • Several methods are proposed in the literature for losses segregation of single phase induction motor. Generally we could divide two methods for experimental determination of losses segregation for single phase induction motor. The one is relatively complicated method based on Parameter estimation of single phase induction motor. The other is simple method based on IEEE Standard 114. Segregation of losses in single phase induction motor is more complicated than that in three phase induction motor, because of the backward magnetic field component in the motor and multiplicity of different single phase type. In this paper, therefore, we studied losses segregation of capacitor-run single phase induction motor.

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A Study of Winding Design for Capacitor Run Single phase Induction Motor (커패시터 구동형 단상유도전동기의 권선설계에 대한 연구)

  • Ham, Sang-Hwan;Im, Jong-Bin;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.776-780
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    • 2011
  • This paper is concerned with winding design in capacitor-run single phase motor. Winding design in single phase induction motor is more complicated than that in three phase induction motor, because of using concentric winding in the single phase. Various winding designs are possible, and accordingly layout of the slot is calculated by formula. And then accurate design of winding is available. Using the design process in this paper, we can get the base model with slot layout and turns of windings of 1.12 kW single phase induction motor, and it is verified by finite element analysis. In this paper, winding design and winding layout of single-phase induction motor using concentric winding are suggested.

Research on Discontinuous Pulse Width Modulation Algorithm for Single-phase Voltage Source Rectifier

  • Yang, Xi-Jun;Qu, Hao;Tang, Hou-Jun;Yao, Chen;Zhang, Ning-Yun;Blaabjerg, Frede
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.4
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    • pp.433-445
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    • 2014
  • Single phase voltage source converter (VSC) is an important power electronic converter (PEC), including single-phase voltage source inverter (VSI), single-phase voltage source rectifier (VSR), single-phase active power filter (APF) and single-phase grid-connection inverter (GCI). As the fundamental part of large scale PECs, single-phase VSC has a wide range of applications. In the paper, as first, on the basis of the concept of the discontinuous pulse-width modulation (DPWM) for three-phase VSC, a new DPWM of single-phase VSR is presented by means of zero-sequence component injection. Then, the transformation from stationary frame (abc) to rotating frame (dq) is designed after reconstructing the other orthogonal current by means of one order all-pass filter. Finally, the presented DPWM based single-phase VSR is established analyzed and simulated by means of MATLAB/SIMULINK. In addition, the DPWMs presented by D. Grahame Holmes and Thomas Lipo are discussed and simulated in brief. Obviously, the presented DPWM can also be used for single-phase VSI, GCI and APF. The simulation results show the validation of the above modulation algorithm, and the DPWM based single-phase VSR has reduced power loss and increased efficiency.