• Title, Summary, Keyword: squirrel cage induction motor

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Comparison of Torque-Speed Curve according to the Changes in Cross-Sectional Area and Shape of Squirrel Cage Rotor of Induction Motor (농형 유도전동기의 회전자 형상과 단면적 변화에 따른 토크-스피드 곡선 비교)

  • Lee, Jin Seok;Lee, Ha Jeong;Park, Gwan Soo
    • Journal of the Korean Magnetics Society
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    • v.26 no.2
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    • pp.67-69
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    • 2016
  • Recently, cost of rare-earth magnets has been raised, because rare-earth magnets are monopolized and the export is also regulated in China. For this reason, the induction motor is operated without the rare-earth magnets. The efficient development of induction motor is more important for economical scheme. A torque of the induction motor is computed and the correlation between dimension and resistance of the squirrel cage rotor is investigated. Also, the correlation between leakage reactance and torque was analyzed with respect to the same dimension of rotor with different shapes. Therefore, this paper proposes the method of improvement for squirrel cage rotor.

A Study on the outside rotor type double squirrel cage Induction motor (외측회전형 이중 농형 유도전동기에 관한 연구)

  • 김현수;배철오;안병원
    • Journal of the Korean Society of Marine Engineering
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    • v.27 no.6
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    • pp.776-782
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    • 2003
  • This paper describes a newly developed double squirrel cage induction motor in which the rotor is located outside the stator. The outside rotor type brushless dc motor has been used for VTR's head drum and PC's cooling fan, but this kind of induction motor has not been developed yet. The parameters of outside rotor type induction motor were measured from the locked rotor test and no load test. It is possible to determine the parameters which are presented in the steady-state equivalent-circuit of the outside rotor type induction motor. Load test of induction motor was carried out using a dynamometer. For the characteristics of torque, efficiency, power factor and output. the developed double squirrel cage induction motor is compared with the ordinary induction motor It is believed that the results of this paper can be used for the development of the outside rotor type induction motor.

The magnetic energy distribution of asymmetrical & eccentrical the squirrel cage induction motor. (농형(籠型) 유도(誘導) 전동기(電動機)의 비대칭(非對稱), 편심구조(偏心構造)에 의한 자기(磁氣) 에너지 분포(分布))

  • Kim, Sang-Baek;Lee, Eun-Woong
    • Proceedings of the KIEE Conference
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    • pp.47-49
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    • 1993
  • The squirrel cage three-phase induction motor has been used in all types of industry for a number of years. A series of noise components were identied analytically from the expressions for the node numbers and frequencies of the magnetic force waves, taking into account the stator and rotor sldtting, eccentricity, asymmetric and iron saturation. A method is presented for calculating the magnetic energy distribution of eccentrical and asymmetric the squirrel cage induction motor.

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Characteristics Analysis on the Effects of Rotor Eccentricity in Squirrel-cage Induction Motor (회전자 편심을 고려한 농형 유도전동기의 특성해석)

  • Kim, Mi-Jung;Kim, Byong-Kuk;Hwang, Don-Ha;Kang, Dong-Sik;Cho, Yun-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.2
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    • pp.289-294
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    • 2007
  • This paper describes the effects of rotor eccentricity in squirrel cage induction machines. Asymmetric electro-magnetic force caused by the frictional worn bearing, rotor misalignment and unbalanced rotor etc. generates an asymmetrical operation, vibration and electro-magnetic noise. The need for detection of these rotor eccentricities has pushed the development of monitoring methods with increasing sensitivity and noise immunity. In this paper, we focus on investigating the asymmetrical operation considering of unbalanced magnetic pull in squirrel-cage induction motor with 380 [V], 7.5 [kW], 4P, 1,768 [rpm]. The effects of the non-symmetric rotor and magnetic force are simulated by finite element method (FEM) and tested using search coils for measuring the actual air-gap flux.

A Study on the Variable Speed Control Characteristics of Outside Rotor type Squirrel Cage Induction Motor (외측 회전형 농형 유도전동기의 가변속 운전특성에 관한 연구)

  • 안병원;박영산;노영오;최민선;김성환;김현수
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.418-422
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    • 2001
  • This paper presents a developed squired cage induction motor for axial flow fan. The developed squirrel cage induction noter for axial flow fan is exchanged the position, rotor and stater. In this method a fan blade is attached to outside rotor. So we can protect the motor from rain and reduce noise, and there is no need to have bending duct to locate the fan motor. Carried out experimental test with this induction motor, and the results were as follows. Starting torque was 21kgㆍcm@120V, maximum efficiency was 0.84@120V. The characteristics of tests were the same as double squirrel-cage type IM.

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The MPPT Control Method of the PMSG Wind Generation System using the Turbine Model with a Squirrel Cage Induction Motor (농형 유도기 터빈 모델을 이용해 구현한 영구자석 동기기 풍력발전 시스템의 MPPT 제어)

  • Lee, Joon-Min;Kim, Dong-Hwa;Shin, Hye-Su;Kim, Young-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.2
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    • pp.231-236
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    • 2012
  • This paper presents the MPPT(Maximum Power Point Tracking)control method of the PMSG wind generation system using the turbine model with a squirrel cage induction motor. The torque of squirrel cage induction turbine model is controlled by mathematization of speed characteristics of real blade. In this paper, maintenance and cost issues into consideration, except for previous method using information of the velocity of the wind speed sensor, the algorithm is presented. The algorithm is controlled by tracking the optimal point, the generator speed and maximum grid power. The vector controls of the generator side converter and the grid side converter are controlled respectively to obtain maximum torque and regulate unity power factor. With Psim simulations and experiments, the efficiency of squirrel cage induction turbine model and the validity of control algorithm are verified.

Comparison of Harmonic Compensation Based on Wound/Squirrel-Cage Rotor Type Induction Motors With Flywheel (플라이휠을 장착한 농형/권선형 전동기를 이용한 두 고조파 보상 시스템의 비교)

  • 김윤호;이경훈;양성혁;박경수
    • Journal of the Korean Society for Railway
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    • v.4 no.1
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    • pp.16-22
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    • 2001
  • This paper describes two different systems which can compensate harmonic currents generated in the power system. As non-linear loads increase gradually in industry fields, harmonic current generated in the electric power network system also increases. Harmonic current makes a power network current distorted and generates heat, vibration, noise in the power machinery. Many approaches have been applied to compensate harmonic currents generated in the power network system. Among various approaches, in this paper, two kinds of approaches are compared and evaluated. They are flywheel compensator based on secondary excitation of wounded rotor induction motor(WRIM) and primary excitation of squirrel cage induction motor(SCIM). Both systems have a common structure. They use a flywheel as a energy storage device and use PWM inverters.

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The Protection Method against the Operation under Unbalance Voltage in 3-phase Squirrel-Cage Induction Motor (3상절형유도전동기의 불평형운전에 대한 보호 방안)

  • 이은욱;박윤호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.33 no.8
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    • pp.281-288
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    • 1984
  • A new method of protecting 3-phase squirrel-cage induction motor aginst burning-out by unbalance operation is proposed. This paper studied various kinds of situations occurred by unbalance operating in 3-phase induction motor, and we provided the search coils in the slots of stator and rotor for the purpose of detecting electrical phenpmena during unbalance operation. Through experiments, we find that search coils in the slots of stator is effective method for protecting the induction motor from unbalance operating.

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Calculations of Resistance and Inductance of End Ring of the Squirrel Cage Induction Motor for 2-Dimensional Finite Element Analysis (농형 유도전동기의 2차원 유한요소해석을 위한 엔드링 저항과 인덕턴스 계산)

  • Chung, H.J.;Shin, P.S.;Woo, S.H.
    • Proceedings of the KIEE Conference
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    • pp.872-873
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    • 2007
  • This paper proposes a calculating method of resistance and inductance of end ring of squirrel cage induction motor for 2D finite element analysis. The squirrel cage of induction motor consists of bars and end rings. The resistance and inductance of end ring have an effect on the result of the finite element calaculation. If the end ring were excluded from the analysis, the good result could not be obtained. Therefore, we first simulate an axisymmetric magnetodynamic analysis for the end ring, and then calculate the interbar resistance and the end ring inductance. The calculated values are put into the external circuit of 2D finite element model of the induction motor. The proposed method is verified by comparing the numerical results with the experimental ones.

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Analysis of the Transient State of the Squirrel Cage Induction Motor by Means of the Magnetic Equivalent Circuit Method

  • Jeong Jong-Ho;Lee Eun-Woong;Cho Hyun-Kil
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.1
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    • pp.34-38
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    • 2005
  • The finite element method is very flexible for new shapes and provides flux distribution, magnetomotive force, eddy currents, and torques. However, it requires lengthy computational time in order to achieve desired accuracy. The magnetic equivalent circuit method takes less computation time than the finite element method. Therefore, the finite element method is mainly used to confirm the completed design. The magnetic equivalent circuit method is convenient for complicated analysis of the transient state of the induction motor. The magnetic equivalent circuit method is restricted to only one direction of magnetic flux. In this paper, the construction elements (that is, stator iron, rotor iron, yoke, air gap, etc.) of the squirrel cage induction motor were represented by a flux tube and the air gap magnetomotive force was calculated by the magnetic equivalent circuit method. Starting transient torque and phase current of the squirrel cage induction motor were verified by the theoretical calculation and the experiment.