• Title/Summary/Keyword: Induction Motor

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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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    • 2002.07b
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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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Development of the Pole Changing Induction Motor (극수 변환 유도모터의 개발)

  • Yun, Dong-Won;Son, Young-Su;Park, Cheol-Hun;Ham, Sang-Yong;Kim, Byung-In
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.1
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    • pp.102-107
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    • 2011
  • In this paper, pole-changing induction motor has been studied. To control the speed of the induction motor, many various methods can be used. Compared to the other speed control method, pole changing method is simple, cost effective, and reliable. From this research, pole changing induction motor with 2 and 4 pole windings are analyzed and designed, of which rated torque is about 2Nm. A real induction motor is also fabricated and some experiment has been performed showing that the analysis and experiment results are similar.

Characteristics for Current and Power of Induction Motor by Load Variation (부하변동에 따른 유도전동기 전류와 전력 특성)

  • Kim, Jong-Gyeum
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.8
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    • pp.82-87
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    • 2011
  • Induction motor is most widely used as the driving power in the industrial site. Induction motor current is composed of two parts, magnetizing current and load current. Load current uses energy what is doing the work. Load current varies with load variance but magnetizing current is constant, regardless of load variation. Magnetizing current needs for establishing the rotating magnetic field of induction motor and lags behind the voltage. Generally capacitor is used for power-factor compensation of inductive load. Self-excitation occurs when the capacitive reactive current from the capacitor is greater than the magnetizing current of the induction motor. When this occurs, excessive voltages can result on the terminals of the motor. This excessive voltage can cause insulation degradation and ultimately result in motor insulation failure. In this paper, we analyzed that how the magnetizing current and condenser current is operating at the allowable limit by the load variation. Condenser current is below allowable limit of magnetizing current but magnetizing current is above allowable limit at the lower load operation condition.

Design of neuro-fuzzy for robust control of induction motor (유도전동기의 강인 제어를 위한 뉴로-퍼지 설계)

  • 송윤재;강두영;김형권;안태천
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2004.04a
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    • pp.454-457
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    • 2004
  • In this paper, control method proposed for effective speed control of the induction motor indirect vector control. For the induction motor drive, indirect vector control scheme that controls torque current and flux current of the stator current independently so that it can have improved dynamics. Also, neuro-fuzzy algorithm employed for torque current control in order to optimal speed control The proposed neuro-fuzzy algorithm can be applied to the precise speed control of an induction motor drive system or the field of any other power systems.

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The Real-Time Control of 3-Phase Induction Motor by DSP Application of Tuning Parameter Using Load Torque Observer and Neural Network (부하관측기와 신경망에 의해 설정된 파라미터의 DSP 적용에 의한 3상 유도전동기의 실시간 제어)

  • 권양원;윤양웅;강학수;안태천
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.135-135
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    • 2000
  • In this Paper. the DSP implementation of induction motor drive is Presented on the viewpoint of the design and experiment. The speed estimation of control system for induction motor drive is designed on the base of neural network speed estimator. This neural network speed estimator is experimentally applied to the induction motor system. This system Provides the satisfactory results.

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A Study on Dynamic Characteristics of Induction Motor System (유도전동기 시스템의 동특성 연구)

  • Lee Hyoung-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5 s.182
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    • pp.128-136
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    • 2006
  • To predict the noise and vibration characteristics of induction motor system, it is necessary to develop the mathematical model including all the mechanical elements such as shaft, blower, rotor, fan, bearing, case and mounting parts. Coupling effect between case-mount system and rotor- shaft system including shaft, blower, rotor, fan and bearing is examined. Impact exciting experimentation was done in order to verify vibration model of the induction motor system. From experimental results, we can appreciate that the natural frequencies of induction motor system are in good agrements with analysis.

Speed control induction motor (속도제어형 유도전동기)

  • 오상세;박창엽
    • 전기의세계
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    • v.17 no.1
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    • pp.6-10
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    • 1968
  • To control of the speed of induction Motor, a variable frequency power supply is needed. But this New type induction Motor Constitute stator and Rotor with New principle, its speed can be easily and widely Controlled by changing phase of the stator, and start at low current than rating without starter. Also, its no load current is same as shart current, and speed increase in proportion to current. On this points this induction Motor for speed control is different from induction Motor using Now.

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The Study of the Stray Load Loss and Mechanical Loss of Three Phase Induction Motor considering Experimental Results

  • Kim, Dong-Jun;Choi, Jae-Hak;Chun, Yon-Do;Koo, Dae-Hyun;Han, Pil-Wan
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.121-126
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    • 2014
  • The accurate determination of induction motor efficiency depends on the estimation of the five losses of stator and rotor copper loss, iron loss, mechanical loss and stray load loss. As the mechanical and stray load losses are not calculated by electro-magnetic analysis, the values of these two losses are very important in induction motor design. In this paper, the values of mechanical loss and stray load loss are proposed through investigating testing data from commercial products of three phase induction motors under 37kW. If the values of this paper are applied to motor design, the accuracy of design and analysis can be improved. The losses of motors are obtained by using load and no-load test results following IEC 60034-2-1 standard.

Speed-torque Characteristics of the Squirrel Cage Induction Motor with High Temperature Superconducting Rotor Bars by the Variation of the Rotor resistance (회전자 저항변화에 따른 고온초전도 단락봉을 사용한 농형유도전동기의 속도-토크 특성)

  • Sim Jung-wook;Lee Kwang-youn;Cha Guee-soo;Lee Ji-kwang
    • Progress in Superconductivity and Cryogenics
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    • v.6 no.3
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    • pp.33-37
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    • 2004
  • This paper presents the construction and test results of an HTS induction motor. End rings and short bars were made of HTS tapes, To increase the efficiency and starting torque, HTS tapes can be used as the rotor bars. Because large current is induced in the rotor circuit, HTS tapes quench and high starting torque can be obtained. As the speed of rotor builds up. HTS tapes which are used as short bars become superconducting state again. After the HTS tapes recover from quench, resistance of the rotor circuit is nearly zero. In that case, power loss in rotor circuit is eliminated. Stator of the conventional induction motor was used as the stator of the HTS motor. Rated capacity of the conventional motor was 0.75 kW. Performances of the HTS induction motor were compared with those of the conventional motor with same volume and specification. Test result showed that the speeds of the HTS induction motor were the same with synchronous speed up to 2.6 Nm and 1.788 rpm at 9.7 Nm. It guarantees the high efficiency of the HTS motor. Starting torque of the HTS motor was more than twice of the conventional motor.

Improvement of Output Characteristics and Acoustic Noise Characteristics for Single Phase Induction Motor with Concentrated Winding (집중권 방식 단상유도기의 출력 및 소음 특성 개선)

  • Chae, Myong-Gi;Cha, Hyun-Rok;Yun, Cheol-Ho;Jung, Tae-Uk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.693-698
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    • 2007
  • In general the distributed winding method is applied for induction motor in order to have the sinusoidal flux distribution. Recently the concentrated winding method is the interested technique so as to lower the material cost portion of copper coil. In the concentrated winding induction motor the harmonic flux and the torque deterioration by it would be occurred. To restrain ill effect of harmonic flux distribution by concentrated winding, the skew of rotor conduction bar is very important design variable. This study is focused on the optimal design of rotor bar's skew and winding turns for concentrated winding induction motor. In this study, the control method of harmonic parasitic torque in concentrated winding induction motor is proposed and validated its practicality through the experiment. As a result of this study, large skew angle which was not conventional in distributed winding was favorable in the concentrated winding induction motor. The concentrated winding induction motor which is designed per the proposed method of this study can be manufactured more cost effectively than conventional distributed winding.