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Torque characteristic of single phase induction motor for phase control mode (위상 제어 방식 단상유도전동기의 토크 특성)

  • Kim, Cherl-Jin;Choi, Chul-Yong;Lee, Dal-Eun;Yoon, Shin-Yong;Baek, Soo-Hyun
    • Proceedings of the KIEE Conference
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    • pp.107-109
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    • 2003
  • Single phase induction motor is directly used usual source, it can be a source of an appliance such as mechanical fan, refrigerator, washing machine, etc. Especially capacitor-run single phase induction motor is suitable to make more inexpensive and high efficient products because it is more high efficiency, and good to start than other single phase induction motors. Generally, voltage and current of capacitor-run single phase induction motor transfer to the part of positive phase and negative phase based on two motor theory. In this paper, we simulate the torque characteristics to capacitance variation from single phase induction motor's equivalent circuit. Through the test using the real motor, we compare and investigate the maximum torque of run state related with capacitance and the adequacy of the converted model.

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A Study on Current and Torque Characteristics Of Three-Phase Induction Motor in Single-Phase Operation. (삼상유도전동기의 결상시 전류 및 회전력특성에 관한 연구)

  • 유춘식;노창주
    • Journal of Advanced Marine Engineering and Technology
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    • v.6 no.1
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    • pp.25-33
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    • 1982
  • The characteristics of the stator current and torque of a small three- phase squirrel cage induction motor and studied experimentally under the situation of a single-phase operation due to various causes. Through the experiments, the torque-slip and current-slip curve of single-phase circuit as well as three-phase circuit are obtained and the needed constants are determined. The stator current and torque are calculated by the current and torque equations derived by the unbalanced circuit theory. The numerical values obtained from the above methods are compared with the experimental values under the same conditions. The results of the study are summerized as follow; 1) The values computed by the unbalanced circuit theory generally come to approach the values recorded through experiments. 2) Near the rated load, speed drop is less than 1.2 per cent of the speed of three-phase induction motor and torque reduces less than 3 per cent of it of three-phase induction motor when three-phase induction motor is run under a single-phase. On the other hand, the stator current in a single-phase circuit is more than 1.9 times of it in three-phase circuit. 3) The stalling torque in a single-phase circuit is reduced to about 41 per cent of it in three-phase circuit while the corresponding slip is moved toward the synchroneous speed and the corresponding stator current is increased.

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Design of Single-Phase Line-Start Permanent Magnet Motor Using Equivalent Circuit Method

  • Kwon, Sun-Hyo;Lee, Chul-Kyu;Kwon, Byung-Il
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.490-495
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    • 2006
  • In this research, the design procedure and the design method of a single-phase line-start permanent magnet motor (LSPM) are proposed. In the design procedure, the permanent magnet is designed first and the windings and capacitors are designed later. As well, the points of design of each design parameter are explained. In the design of the single-phase LSPM, the equivalent circuit method is combined with the finite element method (FEM) because it has a shorter analysis time than FEM. The 400 watts single-phase LSPM is designed and manufactured. The characteristics of the manufactured single-phase LSPM are analyzed and experimented. From the analysis result and the experiment result, it is verified that the design procedure and the design method of the single-phase LSPM is valid.

Output Characteristics of Capacitor-run type Single Phase Induction Motor considering Capacitance (구동 커패시터의 용량에 따른 단상유도전동기 출력특성에 관한 연구)

  • Kim, Cherl-Jin;Lee, Dal-Eun;Jin, Yong-Sun;Choi, Chul-Yong;Baek, Soo-Hyun
    • Proceedings of the KIEE Conference
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    • pp.848-850
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    • 2002
  • Single phase induction motor is directly used usual source, it can be a source of an appliance such as mechanical fan, refrigerator, washing machine, etc. Especially capacitor-run single phase induction motor is suitable to make more inexpensive and high efficient products because it is more high efficiency, and good to start than other single phase induction motors. Generally, voltage and current of capacitor-run single phase induction motor transfer to the part of positive phase and negative phase based on two motor theory. In this paper, we simulate the torque characteristics to capacitance variation from single phase induction motor's equivalent circuit. Through the test using the real motor, we compare and investigate the maximum torque of run state related with capacitance and the adequacy of the converted model.

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The Design Conditions of Single Phase SRM Pole-Arcs for Blower Drives (송풍기 구동용 단상 SRM의 극호 설계 조건)

  • Lee, Jong-Han;Lee, Eun-Woong
    • Proceedings of the KIEE Conference
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    • pp.125-127
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    • 2003
  • The single phase switched reluctance motor(SRM) is more simpler and robust in the structure than poly phase SRM. It has the merits that it reduces the switching elements and the energy density per volume is very high. Recently, it has been researched and developed in various types and starting method due to the technique of power electronics and the computer added design. The single phase SRM is tried to apply to many industrial appliance field to substitutethe the induction motor by the single phase SRM. On the previous studies, we decided the design parameters of the single phase SRM for the blower driver to adapt the design method of the conventional machine and the poly phase SRM. In this studies, it is proposed the conditions to decide the optimal pole arcs because the stator and rotor pole arcs is very important in the characteristics of the single phase SRM. For this reason, it is analysed the characteristics of current on/off angle vs. pole arc, pole arcs vs. average torque.

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Study on single/three phase converter for motor applications of rural district (농어촌 동력용 전동기구를 위한 단상/3상변환기의 개발에 관한 연구)

  • 황영문;조철제
    • 전기의세계
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    • v.25 no.4
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    • pp.68-72
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    • 1976
  • This study is initiated to solve the problem that the development of an electric machine to drive heavy horse-power load required in the rural district, where only single phase supply is available, is very urgent. As a method for this purpose, the single/three phase converter by single phase induction machine with a tapped auxiliary winding, running unloaded mechanically under single-phase source and supplying three-phase output to a loaded 3-phase induction motor, is devised and the pilot machine is put into test. Analysis based on hybrid equivalent circuit for the phase converter and symmertical component theory for the 3-phase load motor and practical experiment result in that optimum auxiliary winding ratio is to be 1.25 rather than theoretical .root.3/2 in order to keep the voltage unbalance ratio of 3-phase output from the converter as low as possible in both cases of starting and running the load motor.

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Single-Phase Z-Source AC/AC Converter with Wide Range Output Voltage Operation

  • Nguyen, Minh-Khai;Jung, Young-Gook;Lim, Young-Cheol
    • Journal of Power Electronics
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    • v.9 no.5
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    • pp.736-747
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    • 2009
  • A new type of single-phase Z-source AC/AC converter based on a single-phase matrix converter is proposed in this paper. The proposed single-phase Z-source AC/AC converter has unique features; namely that the output voltage can be bucked and in-phase/out-of-phase with the input voltage; that the output voltage can be boosted and in-phase/out-of-phase with the input voltage. The converter employs a safe-commutation strategy to conduct along a continuous current path, which results in the elimination of voltage spikes on switches without the need for a snubber circuit. The operating principles of the proposed single-phase Z-source AC/AC converter are described, and a circuit analysis is provided. To verify the performance of the proposed converter, a laboratory prototype based on a TMS320F2812 DSP was constructed. The simulation and the experimental results verified that the output voltage can be bucked-boosted and in-phase with the input voltage, and that the output voltage can be bucked-boosted and out-of-phase with the input voltage.

Single Phase to 3 Phase Conversion Using Cyclo-Converter (Cycloconverter를 이용한 단상-3상 변환에 관한 연구)

  • 박민호;전상대
    • 전기의세계
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    • v.28 no.3
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    • pp.51-56
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    • 1979
  • The purpose of this paper is to study the conversion of single phase to three phase. In the proceeding of phase conversion, it is very convinence to convert two-phase from single phase using cycloconverter before and then two to three phase by scott connection transformer. There are also systematized zero-crossing, mono vibrator and ring counter circuit for the gate trigger circuits of cycloconverter. The wave forms of three phase by experimental results are analyzed and discussed the relation of phase difference among them.

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POWER FACTOR CORRECTION OF CO2 WELDING MACHINE USING SINGLE-SWITCH THREE-PHASE AC/DC CONVERTER

  • Kim, Jse-Mun;Kim, Yuen-Chung;Ahn, Jung-Jun;Won, Chung-Yuen;Kim, Sei-Chan
    • Proceedings of the KIPE Conference
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    • pp.663-667
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    • 1998
  • This paper describes for reducing harmonic distortion on CO2 welding machine with nonlinear load characteristic using single-switch three-phase AC/DC converter. The low-order harmonic component amplitude of the phase current of single-switch three-phase discontinuous mode is calculated. Experimental results show that CO2 welding machine with single-switch three-phase AC/DC converter is effectively controlled with power factor correction for phase current during welding time.

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A Switched Reluctance Motor for Single Phase Drive (단상구동 Switched Reluctance Motor의 해석)

  • Lim, Jun-Young;Kim, Hyung-Sup;Oh, Jae-Yoon
    • Proceedings of the KIEE Conference
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    • pp.1951-1953
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    • 1997
  • A switched reluctance motor (SRM) has very simple structure and robustness. Generally, for driving SRM, several (6-8) switching devices are required. This is weakpoint for reducing the cost of SRM drive. In This paper, we simulate the single phase and three phase SRM, and we compare the performance or single phase SRM with that of three phase SRM through experiment. Finally we suggest the appropriate application of single phase SRM.

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