• Title/Summary/Keyword: Linear force motor

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Improvement of the Thermal Characteristics of Synchronous Linear Motors Through Insulation (단열에 의한 동기식 리니어모터의 열특성 향상)

  • Eun, In-Ung
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.3
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    • pp.123-130
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    • 2002
  • Linear motors can drive a linear motion without intermediate gears, screws or crank shafts. Linear motors can successfully replace ball lead screw in machine tools because they have a high velocity, acceleration and good positioning accuracy. On the other hand, linear motors emit large amounts of heat and have low efficiency. In this paper, heat sources of a synchronous linear motor with high velocity and force measured and analyzed. To improve the thermal characteristics of the linear motor, an insulation layer with low thermal conductivity is inserted between cooler and machine table. Some effects of the insulation layer are presented.

Force Ripple Reduction of 2 Phase Hybrid Lineny Pulse Motor using Neural Network (신경회로망을 이용한 2상 하이브리드 리니어 펄스 모터의 힘 리플 감소)

  • 김유신;박정일
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.362-362
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    • 2000
  • The purpose of this thesis is to reduce force ripple of linear pulse motor(LPM) using neural network and to enhance precision. In order to this, we propose a new controller using a neural network to compensate disturbances. The structure includes adaptation block which learns the dynamics of the periodic disturbance and forces the interferences, caused by disturbances. The proposed controller compensates an unmodeled dynamics in the LPM. The neural network changes a current command to reduce position error and force ripple of the LPM. We compare proposed controller with PI controller. Simulation result shows that the proposed controller has better performance than a PI controller without neural network.

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Analysis of Normal Force and Vibration Characteristics with Tooth Shapes in Linear Pulse Motor (리니어 펄스 모터의 치형상에 따른 수직력 및 진동특성 해석)

  • Kim, Sung-Jong;Lee, Eun-Woong;Kim, Sung-Hun;Lee, Dong-Ju;Oh, Young-Woong
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.151-153
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    • 1999
  • The normal force and vibration characteristic are affected by tooth shapes of linear pulse motor. In this paper, we obtained the normal force according to the position of mover and tooth shapes using the finite element analysis. From the result, we can find the vibration characteristics. Also we predict the characteristics of normal force and vibration.

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Control Based Reduction of Detent Force for Permanent Magnet Linear Synchronous Motor

  • Zhu, Yu-Wu;Cho, Yun-Hyun
    • Proceedings of the KIPE Conference
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    • 2008.10a
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    • pp.172-174
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    • 2008
  • The detent force of the permanent magnet linear synchronous motor (PMLSM) is caused by the interaction between the permanent magnet and the iron core of the mover without input current. It is a function of the mover position relative to the stator. This paper proposes a control based method to reduce the detent force for the PMLSM. This detent force that can be predicted by finite element method (FEM) is compensated by injecting the instantaneous current using the field oriented control (FOC) method. Both the simulated and experimental results are reported to validate the effectiveness of this proposed method.

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Nonlinear Adaptive Control for Position Synchronization of a Gantry-Moving-Type Linear Motor (겐트리형 리니어 모터의 동기화를 위한 비선형 적응제어)

  • Han, Sang-Oh;Kim, In-Keun;Huh, Kun-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.12
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    • pp.1925-1930
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    • 2010
  • For high-speed/high-accuracy position control of a gantry-moving-type linear motor, we propose a nonlinear adaptive controller including a synchronization algorithm. Linear motors are easily affected by force ripple, friction, and parameter variations because there is no mechanical transmission to reduce the effects of model uncertainties and external disturbances. Synchronization error is also caused by skew motion, model uncertainties, and force disturbance on each axis. Nonlinear effects such as friction and ripple force are estimated and compensated for. The synchronization algorithm is used to reduce the synchronous error of the two side pillars. The performance of the controller is evaluated via computer simulations.

A Robust Control Scheme of Linear Induction Machine for Automatic Picking System Using Mass Estimation and Disturbance Force Observer (질량추정과 외란추력 관측기를 이용한 자동피킹 시스템 구동용 선형 유도모터의 강인제어 기법)

  • Choi, Jung-Hyun;Yoo, Dong-Sang;Kim, Kyeong-Hwa
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.4
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    • pp.62-72
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    • 2013
  • To operate an automatic picking system in distribution center with high precision and high dynamics, this paper presents a robust control scheme of a linear induction motor (LIM) using the mass estimation and disturbance force observer. The force disturbance which gives a direct influence on the control performance of LIM is estimated in real-time through the disturbance observer and compensated by a feedforward manner. To get a satisfactory performance even under the mass variation by reducing the disturbance force due to the mismatched mass during the speed transient such as the acceleration and deceleration periods, a mass estimation algorithm is proposed. A Simulink model for LIM is developed and the validity of the proposed scheme is verified through the comparative simulation studies using Matlab - Simulink.

Side force analysis of Linear Motor for Linear Compressor by using 3-D Finite Element Analysis (3차원 유한요소법을 이용한 리니어 압축기에 사용되는 리니어 모터의 편심력 해석)

  • Lee, Heon;Kang, Je-Nam;Wang, Se-Myung;Hong, Eon-Pro;Park, Kyeong-Bae
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.684-686
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    • 2003
  • Until recently, the 2-D FEA neglects the magnetic field fringing and end-leakage, it leads to the approach of a trial and error experimental design. Since 3-D FEA is investigated for exact side force analysis of Linear Motor for Linear compressor. For the 3-B FEA, ANSYS as commercial tool are used.

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Development of Motion Generator Based on Implementation of Active Impedance (능동 임피던스의 구현에 기초한 운동 발생기의 개발)

  • 이세한;송재복;김용일
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.7
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    • pp.160-166
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    • 1998
  • In this research a 2-dimensional motion generator composed of two linear motors was developed. The inertia, damping and/or stiffness characteristics of the motion generator can be changed on the real-time basis by properly regulating the force generated by the linear motors. That is, active impedance is implemented without actual change in the physical structure of the motion generator. Control of the motor force is carried out by controlling the input currents supplied to the linear motors based on the combination of the PI controller and feedforward controller. This motion generator can be used to measure a kinesthetic sense associated with the human arm and thus to develop the products for which the kinesthetic sense is taken into account.

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Design of VCM(Voice Coil Motor) for Nanoindenter (나노인덴터용 보이스코일 모터 설계)

  • Cho, J.H.;Kwon, B.I.;Woo, K.I.;Jun, H.D.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.577-579
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    • 2002
  • Propose of this paper is VCM (voice coil motor) design for application of Nanoindenter, which enable control of extremely small force and displacement. This paper present the VCM shape to produce a very small force by the difference of flux density of lower part from higher one. In wide range of current. VCM produces linear driving force and operate on regular thrust having maximum displacement(100um) was practiced.

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Linear Induction Motor for Magnetic Levitation Vehicle (자기부상열차용 선형 유도전동기)

  • Kim Jeong-Cheol;Park Yeong-Ho;Kim Dae-Kwang;Choi Jong-Mook
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.220-224
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    • 2005
  • EMU(Electric Multiple Unit) operated in local area is mostly consist of moving system on the rail and the traction motor drives the gear and wheel with the mechanical propulsion force. Most of countries are interested in Magnetic Levitation Vehicle for the transportation system on next generation and they have been studying about it continuously. Thus this paper is studied the Linear Induction Motor as the propulsion equipment of Magnetic Levitation Vehicle

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