• Title/Summary/Keyword: CAGE

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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.

On Cutting Characteristics Change of Low Temperature Cooling Tool -Cutting Characteristics of Cage Motor Rotor- (저온냉각공구의 절삭특성 변화 -모타 회전자의절삭특성-)

  • 김순채
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1995.10a
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    • pp.37-43
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    • 1995
  • The cutting process of cage motor rotor require high precision and good roughness, the surface roughness fo cutting face is very important factor with effect on the magnetic flux density of cage motor rotor. The paper describes a cause of decrease in the cutting force and roughness on low temperature cooling tool by means of analysis on the mechanism of force system at cutting condition and experimental findings. The main results as compared with the room temperature cutting are as follow : 1) The cutting resistance decreased due to low temperature cooling tool. 2) The surface roughness decreased due to low temperature cooling tool. 3) The low temperature cooling tool effected machinability of the cutting direction in machined surface. 4) The low temperature cooling decreased burr of corner in feed direction.

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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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    • 2001.05a
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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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Evaluation of Structural Integrity in the Squirrel Cage of Traction Motor (견인전동기의 농형 구조 안전성 평가)

  • Hong, Dan-Bi;Cheong, Choon-Sahng
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.825-830
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    • 2001
  • Many techniques have been developed to evaluate the structural integrity for the traction motor with squirrel cage. However, the former approaches are not appropriate to our problems and there is no reliable specification for evaluation of squirrel cage motor. In this study, an improved boundary condition and the criteria for evaluation are proposed. Using 3-dimensional solid element, finite element model is generated. The number of meshes can be reduced by considering the symmetry of geometry. Stress analyses are carried out for three types of traction motors.

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Study on the Position Control System of the Float Chamber using Air Control (부양체 수중 위치제어에 관한 연구)

  • Hur, J.G.;Kim, T.H.;Yang, K.U.
    • 유공압시스템학회:학술대회논문집
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    • 2010.06a
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    • pp.75-80
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    • 2010
  • The paper is that study method to reduce bad influence that act to the floating fish cage by effect of environment in sea. Fish cage is controlled buoyancy using air control. According to marine environment, it is descend automatically to set-up depth and rise on the surface of the sea. The paper is the preceding research for a practical application. The fish cage simplified with the spherical float body. Then a control algorithm and a program developed by the experiment. And we did modelling by bond graph technique, and controlled by the practical reference model for PID control.

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The analysis on magnetic flux by the rotor slot of Squirrel-cage induction motor (농형유도전동기(籠型誘導電動機)의 회전자(回轉子) 슬롯 형상(形狀)에 따른 자속밀도(磁束密度) 해석(解析))

  • Oh, Young-Soo;Lee, Eun-Woong;Lee, Dong-Ju;Moon, Jae-Yun
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.299-301
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    • 1998
  • The torque characteristic of an induction motor is affected greatly by the slot shape at which the conductors of the rotor are located. In this paper, the three analysis model; general type, deep slot type, double squirrel-cage type, of which the slot shapes are different, were analyzed by FEM at no load, at rated load, and at standstill respectively. The flux distribution and air-gap flux density were also obtained. From the above result, it was confirmed that the analysis models of deep slot and double squirrel-cage had more desirable characteristics than those of general squirrel-cage.

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Calculation of Resistance of Cage Rotor End Ring using 3-D Finite Element Method (3차원 유한요소법을 이용한 농형유도전동기 단락환의 저항계산)

  • Bak, Min-Woo;Lee, Bok-Yong;Jung, Hae-Duk;Lee, Ki-Sik
    • Proceedings of the KIEE Conference
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    • 1995.07a
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    • pp.92-94
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    • 1995
  • This paper is to describe a method for calculating resistance of cage rotor end-ring, based on 3-D finite element method using magnetic vector potential $\vec{A}$ and electric scalar potential ${\phi}$. The induced current of a cage rotor flows through the bars of a cage rotor. The current completes their closed paths by passing around the end-ring. The end-ring may contribute a significant influence to the performance of machine. The resistance under consideration of skin effect is calculate by using Joule's loss equation.

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NMDA-type Glutamatergic Modulation in Dopaminergic Activation Measured by Apomorphine-Induced Cage Climbing Behaviors

  • Jang, Choon-Gon;Lee, Seok-Yong
    • Archives of Pharmacal Research
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    • v.24 no.6
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    • pp.613-617
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    • 2001
  • The present study examined the hypothesis that NMDA, AMPA/Kainate, and metabotropic (mGlu) glutamate receptors contribute to a behavioral stimulation induced by activation of dopamine receptors by comparing responses in apomorphine-induced cage climbing behaviors in mice. MK-801, CNQX, and MCPG were served as the NMDA receptor, AMPA/Kainate receptor, and mGlu receptor antagonist, respectively, to elucidate the glutamatergic modulation in apomorphine-induced eopaminergic activation in mice. Drugs were administered intracerebroventricularly (i.c.v.) into the mouse brain 15 min before the apomorphine treatment (2 mg/kg, s.c.). 1.c.v. injection of MK-801 inhibited the apomorphine-induced cage climbing behavior dose-dependently. However, treatments with CNQX and MCPG did not any significant change in apomorphine-induced cage climbing behavior in mice. These results suggest that stimulation of NMDA type of glutamate receptors could contribute to the dopaminergic sti mutation, but not AMPA/Kainate and mGlu type glutamate receptors.

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Synthesis of a small molecular cage consisting of three aminomethyl pyrroles and its selective fluoride recognition

  • Nam Jung, Heo;Hye Jin, Han;Jaewon, Choi;Sung Kuk, Kim
    • Journal of the Korean Magnetic Resonance Society
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    • v.26 no.4
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    • pp.40-45
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    • 2022
  • A small cage-like molecule (2) composed of three aminomethyl pyrroles and two hexa-substituted benzenes has been prepared by reduction of its iminopyrrole analogue (1) using NaBH4. It was revealed by 1H NMR spectroscopic analyses that cage molecule 2 strongly binds the fluoride anion in polar DMSO-d6 relative to CDCl3. Compared to that of compound 1, the lowered affinity of 2 for the fluoride anion is attributable to its increased electron density resulting from the production of thesecondary amine groups.

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.