• Title/Summary/Keyword: Linear force motor

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A development of cylindrical type Linear Pulse Motor (원통형 LPM의 설계 및 제작기법에 관한 연구)

  • Kim, Moon-Hwan;Lee, Nam-Ki;Ahn, Jong-Bo;Kim, Kook-Hun;Yi, Dong-Young;Lee, Sang-Jin
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.2073-2075
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    • 1998
  • A cylindrical type Linear Pulse Motor (LPM) was designed as a linear motion actuator. In this paper, it is mentioned the mechanical design method of the LPM. It was designed as a prototype to estimate a new linearization control method for the nonlinear thrust force which is caused by the variable reluctance of the LPM. The designed LPM is determined a variable reluctance type to except the term of permanent magnetic force. The concreted figures and the dimensions will be described.

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Air Gap Change of a Maglev Vehicle at the Moment a Linear Induction Motor Runs (자기부상열차 가속 순간 부상공극 변화)

  • Shin, Hyeon-Jae;Han, Hyung-Suk;Kim, Dong-Sung;Kim, Bong-Seup
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.1218-1223
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    • 2009
  • LIM(Linear induction motor)s are the main type of motors used for urban Maglev vehicles because they are less expensive to operate at a lower speed than linear synchronous motors. An LIM generates an attraction force while running, which perturbs the air gap of the electromagnet. This undesirable air gap variation could result in the mechanical contact of an electromagnet with the reaction plate. For this reason, the magnitude of the air gap variation must be limited within a certain range. The air gap changes when running the 1/2 vehicle under development for testing are analyzed through a test on the test track at KIMM. The results from this study could be used to minimize the air gap variations due to attraction force from LIM.

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A New Moving-magnet Type Linear Actuator utilizing Flux Concentration Permanent Magnet Arrangement

  • Goto, Akira;Okamoto, Takuya;Ikariga, Atsushi;Todaka, Takashi;Enokizono, Masato
    • Journal of Electrical Engineering and Technology
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    • v.7 no.3
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    • pp.342-348
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    • 2012
  • This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic pole sections connected with a center yoke. The improved motor performance is demonstrated with the prototype machine.

Optimization of the design variables of linear motor by FEM (유한요소법에 의한 선형모터의 설계 변수 최적화)

  • Shin, Soo-Hyun;Lee, Sang-Ryong;Jung, Jae-Han
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.7
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    • pp.1232-1240
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    • 2002
  • Recently, linear motors are applied to many small precision products. Thus high generating power with small size is required of it. In order to increase the motor efficiency, the design variables need to be optimized. In this study, Vector Fields FEM software, OPERA-3d, was used for simulating linear motor. The thrust and magnetic flux density at the air-gap center were simulated and compared with the experimental results. Taguchi method was applied to investigate the effects of each variables. As a result, the thickness of conductor and magnet was important for the thrust but the thickness of the yoke. The temperature of the conductor was determined by finding the thermal conductivity that was determined by experimentation. Correlation equation relating to the thrust and temperature was proposed by Latin square and Least Square method. The optimum design variables were determined by correlation equation, and compared with simulation results. According to this analysis, thrust force of linear motor was improved about 7% comparing with conventional model.

A Study on the Vibration Characteristics of 2-phase Linear Stepping Motor (2相 Linear Stepping Motor의 진동특성에 관한 연구)

  • 오홍석;김동희;이상호;정도영;김춘삼
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.6
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    • pp.554-560
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    • 1999
  • In this paper, a vibration suppression method using an energy stored in winding inductance and an induced v voltage of the Linear Stepping Motor(LSM) is shown, and it is applied to a new one-phase excitation method A And a magnetic equivalent circuit is based on the structure of the LSM, and then the electric equivalent circuit of the LSM is derived by solving equations for the magnetic equivalent circuit. Several dynamic characteristics of the LSM are analyzed by the ACSL with the voltage equations, the force equations and the kinetic equation, a and are measured by experimental system.

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Characteristic Analysis and Experimental Verification of the Axially Asymmetric Structured Outer-Rotor Type Permanent Magnet Motor

  • Seo, Myung-Ki;Lee, Tae-Yong;Park, Kyungsoo;Kim, Yong-Jae;Jung, Sang-Yong
    • Journal of Electrical Engineering and Technology
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    • v.11 no.4
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    • pp.898-904
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    • 2016
  • In this study, we have dealt with a design characteristic of outer-rotor type permanent magnet (PM) motor applied for Engine Cooling Fan (ECF). When we design a motor with structure like this type, it is required as a requisite to consider 3-Dimensional (3-D) effect by implementing a non-linear Finite Element Analysis (FEA) due to a yoke-ceiling, which is perpendicular to the axis of rotation. We have analyzed identical models under three different conditions. The analysis has been performed through a non-linear 2-Dimensional (2-D) and 3-D FEA. Finally, the results have been compared with Back Electro-Motive Force (BEMF) value of actual motor model. As a result, a yoke-ceiling function as an additional flux path and the operating point on B-H curve of rotor material is shifted to non-saturation region relatively. Accordingly, magnetic flux linkage can be increased and motor size can be decreased under same input condition to satisfy ECF specification, such as torque.

A Study on Transverse Edge Effect in Linear Induction Motor With Sheet Rotor (Sheet Rotor를 가진 직선형 유도전동기의 Transverse Edge Effect에 관한 연구)

  • Yun Jong Lee;Dal Ho Im;Soo Hyun Baek
    • 전기의세계
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    • v.23 no.4
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    • pp.39-45
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    • 1974
  • In most previous research work, the transverse edge effect has been allowed for only by use of a relativity-increase factor. This paper gives a more exact treatment. A two-dimensional-field analysis is presented for the problem of sheet rotor linear induction motor with finite width the method used takes account of flux leakage in the space between the stator and secondary sheet rotor as well as in the secondary itself. Equations are derived for the flux density distribution in the air gap and for the starting face, in each case as a function of stator current. The cross gap flux density peaks towards athe edge of the stator. This phenomena is known as the transverse edge effect. Measurements of the flux density in the air gap and starting force on a linear induction motor with sheet rotor of different width showed a reasonable agreement,suggest that it would be desirable to take into account also, at least for this motor in which severe redistribution occurs.

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Precise Control of a Linear Pulse Motor Using Neural Network (신경회로망을 이용한 리니어 펄스 모터의 정밀 제어)

  • Kwon, Young-Kuk;Park, Jung-Il
    • Journal of Institute of Control, Robotics and Systems
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    • v.6 no.11
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    • pp.987-994
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    • 2000
  • A Linear Pulse Motor (LPM) is a direct drive motor that has good performance in terms of accuracy, velocity and acceleration compared to the conventional rotating system with toothed belts and ball screws. However, since an LPM needs supporting devices which maintain constant air-gap and has strong nonlinearity caused by leakage magnetic flux, friction and cogging, etc., there are many difficulties in improvement on accuracy with conventional control theory. Moreover, when designing the position controller of LPM, the modeling error and load variations has not been considered. In order to compensate these components, the neural network with conventional feedback controller is introduced. This neural network of feedback error learning type changes the current commands to improve position accuracy. As a result of experiments, we observes that more accurate position control is possible compared to conventional controller.

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Characteristic Analysis of a rotary small-scale model of a linear induction motor used for an urban railway transit (철도차량용 LIM의 회전형 축소모델의 특성 해석)

  • Yang, Won-Jin;Park, Chan-Bae;Lee, Hyung-Woo;Kwon, Sam-Young;Park, Hyun-June;Won, Chung-Yeun
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.2011-2014
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    • 2008
  • A linear induction motor for urban railway transit is accompanied with the end-effect and large air-gap comparing with a rotary induction motor. These cause amount of difference between simulation results and experiments. In order to figure out the difference, experiments based on a real-scale test bed are indispensable, however building a test-line and a test vehicle is so difficult that authors are going to make a small-scale model and simulate it for comparison. In this paper, A rotary-type small-scale model of a linear induction motor is designed. Thrust and normal force of the model have been analyzed with the variation of frequency and speed by using a Finite Element Method(FEM).

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Algorithm for the Initial Pole Position Estimation of Permanent Magnet Linear Synchronous Motor (영구자석 선형동기전동기의 초기자극 위치 추정 알고리즘)

  • Yun Won-Eel;Lee Young-Ho;Choi Jong-Woo;Kim Heung-Geun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.1
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    • pp.13-20
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    • 2005
  • This paper has proposed an algorithm for the initial pole position estimation of a permanent magnet linear synchronous motor(PMLSM). The algorithm finds the initial pole position observing the maximum values of a position generated by the new proposed two reference frames for the same force input. So, the proposed algorithm does not utilize the motor parameters and is insensitive to them. Moreover, the proposed algorithm is easily realized because the proposed method is just using PI controller