• Title/Summary/Keyword: Motor Core

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Analysis of Core Losses in Capacitor-Run Single Phase Induction Motor Using the Finite Element Methods (유한요소법을 이용한 캐패시터 운전형 단상 유도전동기의 철손해석)

  • Min, Byoung-Wook;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.342-344
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    • 1999
  • This paper presents the analysis of core losses in capacitor-run single phase induction motors using the finite element methods. The double revolving field theory can be used for the analysis to assess the quantitative and qualitative performance of the single-phase induction motor. But it is difficult to evaluate accurately the core losses. It is more difficult to segregate stator and rotor core losses at no-load and load conditions. Numerical analysis such as FEM can be used effectively for the accurate calculation of core losses and motors performances. In this paper, the coupling method of core loss characteristic equation and FEM are proposed for the accurate calculation of core losses in the stator and rotor. The FFT is also used to calculate fundamental and harmonic components in the yoke and teeth parts of motor.

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Establishment of Design Criteria for Slot Shape Considering Castability of Aluminum Diecasting Process for Large Industrial Motor Rotor (대형 산업용 전동기 회전자용 알루미늄 다이캐스팅의 주조성을 고려한 슬롯 형상 설계 기준 정립)

  • Lee, Sung-Mo;Kim, Deok-Su;Park, Tae-Dong;Yoon, Young-Cheol
    • Journal of Korea Foundry Society
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    • v.36 no.1
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    • pp.10-17
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    • 2016
  • Numerical analysis has been performed to evaluate effect of the shape variables such as core length, slot width and slot length on misrun in aluminum die casting process for motor rotor. The predictive method for misrun in diecasting process was established by comparing the result of numerical analysis and an actual motor rotor. Solidification modulus was introduced to predict quantitatively the castability of aluminum diecasting process for motor rotor. It was found that there are minimum critical solidification modulus and slot width to prevent misrun according to core length through diecasting limit diagram proposed using the predictive method. The critical solidification modulus and slot width increase as core length increases to prevent misrun of aluminum motor rotor in diecasting process. Based on the results, the design criteria of slot shape to prevent misrun of aluminum motor rotor with various core length were established.

Sensorless Sine-Wave Controller IC for PM Brushless Motor Employing Automatic Lead-Angle Compensation

  • Kim, Minki;Heo, Sewan;Oh, Jimin;Suk, Jung-Hee;Yang, Yil Suk;Park, Ki-Tae;Kim, Jinsung
    • ETRI Journal
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    • v.37 no.6
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    • pp.1165-1175
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    • 2015
  • This paper presents an advanced sensorless permanent magnet (PM) brushless motor controller integrated circuit (IC) employing an automatic lead-angle compensator. The proposed IC is composed of not only a sensorless sine-wave motor controller but also an isolated gate-driver and current self-sensing circuit. The fabricated IC operates in sensorless mode using a position estimator based on a sliding mode observer and an open-loop start-up. For high efficiency PM brushless motor driving, an automatic lead-angle control algorithm is employed, which improves the efficiency of a PM brushless motor system by tracking the minimum copper loss under various load and speed conditions. The fabricated IC is evaluated experimentally using a commercial 200 W PM brushless motor and power switches. The proposed IC is successfully operated without any additional sensors, and the proposed algorithm maintains the minimum current and maximum system efficiency under $0N{\cdot}m$ to $0.8N{\cdot}m$ load conditions. The proposed IC is a feasible sensorless speed controller for various applications with a wide range of load and speed conditions.

Study for Improvement of Tracking Accuracy of the Feeding System with Iron Core Type Linear DC Motor by Neural Network Control (신경망 제어에 의한 철심형 리니어모터의 추종성 향상 연구)

  • 송창규;김경호;정재한
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.73-77
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    • 2002
  • The requirements for higher productivity call for high speed of the machine tool axes. Iron core type linear DC motor is growly accepted far a viable candidate of the high speed machine tool feed unit. LDM, however, has inherent disturbance force components: cogging and force ripple. These disturbance force directly affects tracking accuracy of the carrage and must be eliminated or reduced. Reducing motor ripple, this paper adapted the feed forward compensation method and neural network control. Experiments carried 7ut on the linear motor test setup show that this control methods is usable in order to reduce the motor ripple.

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Study for Improvement of Tracking Accuracy of the Feeding System with Iron Core Type Linear DC Motor (철심형 리니어모터 이송계의 추종성 향상에 관한 연구)

  • 송창규;황주호;박천홍;김경호;정재한
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.71-73
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    • 2001
  • The requirements for higher productivity call for high speed of the machine tool axes. Iron core type linear DC motor is growly accepted for a viable candidate of the high speed machine tool feed unit. LDM, however, has inherent disturbance force components: cogging and force ripple. These disturbance force directly affects the carrage tracking accuracy and must be eliminated or reduced. Reducing motor ripple, this paper adapted the feed forward compensation method. Experiments carried out on the linear motor test setup show that this compensation method is usable in order to reduce the motor ripple.

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Development of Iron Core type Linear Motor for Machine Tool (공작기계용 철심형 니니어모터 기술개발)

  • 정재한;박재완
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.33-36
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    • 1997
  • The merits of linear motor are high speed, high acceleration and goad positioning accuracy. In addition, Linear motor for high quality machme tool call for high thrust, high stiffness. In using linear motor we also consider thrust ripple, detent force and thermal behavior. In this research, Iron core type single sided linear DC motor(LDM) is designed which thrust is 6,000 N. To accomplish this design, Various research is hlfilled l~ke the relation of thrust and permanent magnet position angle, the variation of detent force and thrust ripple, dynamic characteristics, and so on.

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A Study on the Design of High Efficiency Induction Motor by Grain-oriented Magnetic Cores (방향성 자기재료에 의한 유도전동기의 효율향상설계에 관한 연구)

  • 황영문;이인칠;안진우;박한웅
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.38 no.3
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    • pp.173-181
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    • 1989
  • A split-phase induction motor with asymmetrical magnetizing reactance axes develops starting torque and its efficiency can be high under certain conditions. In this paper, one method of producing the asymmetry of magnetizing reactance axes is described. The grain-oriented silicon steel core is used to produce the asymmetric axes instead of non-oriented silicon steel core which is used in general motors. The optimum design method for the motor is suggested and analyzed. To verify this suggestion, the permanent capacitor run type induction motors are designed to be driven at balanced condition by its asymmetrical effect, and then the oscillating torque due to the asymmetry of motor structures are analyzed. Tests of the sample motor have shown good performance comparable to ordinary types. This motor structure can be used where high effciency and reliability are required, and also the amount of core materials can be reduced due to its high permeability.

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Core loss Calculation of a Permanent Magnetic Motor Considering Mechanical Stress (영구자석 전동기 철심의 기계적 응력을 고려한 철손 해석)

  • Kim, Ji-Hyun;Ha, Kyung-Ho;Kwon, Oh-Yeoul;Kim, Jae-Kwan;La, Min-Soo;Lee, Sun-Kwon
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.851_852
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    • 2009
  • Shrink fitting which is assembling process to fix stator core on the motor frame is widely used at the mass production line of motors because of cost and productivity. This process produces compressive stress on a stator core, which causes negative effect for example, core and copper losses on motor performance. Magnetic properties of electrical steel are effected by both compressive and tensile and thermal stresses. Electromagnetic field analysis is considered one of the effective process since one can predict motor performance including core loss precisely. This method can consider non linear magnetic property with magnetic saturation which is typical electrical steel behavior. However this method is strongly depended on non linear magnetic data, one may have different calculation result whether considering mechanical stress or not. This study describes magnetic field analysis of a motor considering mechanical stress from shrink fitting. Analysis results are compared with each stress-free and stressed condition.

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Characteristic Analysis of Automotive Starter DC Motor with Auxiliary Pole Core (보조극을 가지는 자동차 시동용 직류 전동기의 특성분석)

  • 하재평;하경호;홍정표;김진구
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.3
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    • pp.107-115
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    • 2003
  • This paper deals with the effect of the auxiliary pole core in the automotive starter motor on its characteristics. This motor is excited by the permanent magnet and has auxiliary pole core in the stator. The auxiliary pole core is a device to increase the effective flux to obtain the starling torque and prevent the demagnetization of the permanent magnet from the starting current. It Is important to design the auxiliary pore core. And overhang structure causes the electromagnetic phenomenon of 3-dimensional flux Path. Therefore. the characteristic analysis is achieved by the 2-dimensional Finite Element Method (FEM) with the compensated model and the 3-dimensional Equivalent Magnet Circuit Network (3D EMCN). The mechanical loss and the brush and coil resistance are separated from the various experiment of the tested motor, and then these factor are reflected on the analysis results. The validity of the proposed analysis method is verified by comparing the experimental and analysis results. The effects of the design parameters related to the auxiliary pole cote on the motor performance are analyzed by the proposed method.

The Characteristic Analysis of an Automotive Starter Motor with Pole Core (보조극형 자동차 시동용 직류전동기의 특성해석)

  • Bae, Joon-Young;Kim, Jin-Goo;Lee, Sang-Ryong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.12
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    • pp.2605-2614
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    • 2002
  • This paper describes an analysis method based on the experimental parameter for the 0.9kW starter motor of vehicle with permanent magnet and pole core, and analyzed the influence by the effect of pole core of starting motor by using the 2D-FEM analysis technique to reflect the structural characteristic of 3D. A starter motor consists mainly of armature, yoke and permanent magnet with the pole core. Additionally, there is different the axial length of each part. Therefore, the effective of analysis method is needed to improve the characteristic of it. This paper approached the 2D-FEM analysis estimated by the 3D-EMCN(Three Dimensional Equivalent Magnetic Circuit Network) instead of the 3D-FEM analysis to minimize parameters. As a result, this paper is proposed the validity of 2D-FEM analysis and obtained reasonable results for improving a performance.