• Title, Summary, Keyword: moving-magnet

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Permanent Magnet Shape Optimization of Moving Magnet type PMLSM for Thrust Ripple Minimization (가동 영구자석형 PMLSM 추력리플 최소화를 위한 영구자석 형상 최적화)

  • Yoon Kang-Jun;Lee Dong-Yeup;Kim Gyu-Tak
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.2
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    • pp.53-59
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    • 2005
  • In this paper, optimum shape design of permanent magnet in slotted type Permanent Magnet Linear Synchronous Motor(PMLSM) is progressed for minimization of detent force owing to structure of slot-teeth and thrust ripple by harmonic magnetic flux of permanent magnet. In order to reduce remodeling time as changing design parameter for Permanent Magnet shape optimization, the moving model node technique was applied. The characteristics of thrust and detent force computed by finite element analysis are acquired equal effect both skewed basic model and optimum model which is optimization of permanent magnet shape. In addition to, thrust per unit volume is improved 4.l2[%] in optimum model.

Moving Mesh Technique for Dynamic Characteristics Analysis of Permanent Magnet Linear Synchronous (영구 자석형 선형 동기전동기의 동특성 해석을 위한 이동 메쉬 기법)

  • Woo, Kyung-Il;Kwon, Byung-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.2
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    • pp.53-58
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    • 2001
  • This paper describes a moving mesh technique for dynamic characteristics analysis of permanent magnet linear synchronous motor with the secondary aluminium sheet. The moving mesh technique applied to the linear induction motor can be used to analyze the linear synchronous motor with the rectangular permanent magnet. But in case of the permanent magnet with taper, the shape of the permanent magnet is presented. The time-stepped finite element method is used for the dynamic characteristics simulation of the permanent magnet linear synchronous motor, The results of application example(hysteresis current controlled inverter fed control) such as thrust, current and flux plots are shown.

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Numerical Analysis of Moving Type and Static Type Electrodynamic Suspension Simulator with Superconducting Levitation Magnet (초전도 부상자석을 이용한 동적 및 정지형 반발식 자기부상 시험기의 수치해석)

  • Lee, E.R.;Bae, D.K.;Chung, Y.D.;Yoon, Y.S.;Ko, T.K.
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.1
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    • pp.49-54
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    • 2009
  • This paper presents the numerical simulation results on the moving type electrodynamic suspension (EDS) simulator and static type EDS simulator using high-Tc superconducting (HTS) levitation magnet. The levitation force of the EDS system is formed by the reaction between the moving magnet and the fixed ground conductor. The possible two ways to simulate the EDS system were simulated in this paper by using finite element method (FEM). The first way was the moving type simulator which consists of the fixed HTS magnet and the moving ground conductor. The second way was the static type simulator which consists of the fixed magnet, the fixed ground conductor and the ac current supply system. To verify the characteristics of high speed EDS system with the moving type simulator heavy, large and fast moving ground conductor is needed. The static type simulator can get the characteristics of the high speed EDS system by applying equivalent ac current to velocity, therefore it does not need large moving part. The static type EDS simulator, which can consist of an HTS magnet, the fixed ground conductor(s), an AC power supply and the measuring devices, also test the effect of the shape of the ground conductor easily. The plate type ground conductor made stronger levitation force than ring type ground conductor. Although the outer diameter 335 mm ring type ground conductor (Ring3) was larger than the outer diameter 235 mm ground conductor (Ring2), the levitation force by Ring2 was stronger than that by Ring3. From the calculation results on this paper, the consideration of the magnetic flux distribution according to the levitation height should be included in the process of the ground conductor design.

Improvement of Assembling Efficiency for Moving Magnet Type Actuator in High Density Optical Disc (고밀도 광 디스크용 가동자석형 구동기의 조립성능 개선)

  • 김도환;정호섭;윤용한
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.356-361
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    • 2004
  • A moving-magnet type pickup actuator has an assembly error . That is, the actuating part of an actuator is shifted from initial position after we assemble it into yoke. This is the result of an effect of magnetic force between magnet and yoke. We performed magnetic-analysis using FEA. As a result of simulation, we improved the assembl ing efficiency for moving-magnet type actuator.

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Improvement of Assembling Efficiency for Moving Magnet Type Actuator in High Density Optical Disc (고밀도 광디스크용 가동자석형 구동기의 조립성능 개선)

  • Jeong, Ho-Seop;Yoon, Yong-Han;Kim, Do-Hwan
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.14 no.12
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    • pp.1255-1260
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    • 2004
  • A moving-magnet type pickup actuator has an assembly error. That is, the actuating Part of an actuator is shifted from initial position after we assemble it into yoke. This Is the result of an effect of magnetic force between magnet and yoke. We performed magnetic-analysis using FEA. As a result of simulation, we improved the assembling efficiency for moving-magnet type actuator.

Simulation of Quench in Pancake-shaped Superconducting Magnet Using a Quasi-three-dimensional Model

  • Wang, Qiuliang;Yoon, Cheon-Seog;Kim, Kee-Man
    • Progress in Superconductivity
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    • v.1 no.2
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    • pp.125-134
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    • 2000
  • A quench phenomenon is caused by an external disturbance in a superconducting magnet, where the magnet is operating in a cryogenic environment. The heat coupling between the layers and pancakes of the magnet can induce the normal zone propagation with fast speed. In order to analyze quench behavior in a pancake-shaped superconducting magnet, a quasi-three-dimensional model is proposed. A moving mesh finite volume method is employed in solving the heat conduction equation. The quench process of the superconducting magnet is studied under the various operating conditions and cooling conditions.

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Optimization of the Permanent Magnet Shape in Moving Magnet Type Permanent Magnet Linear Synchronous Motor (Moving Magnet Type PMLSM의 영구자석 형상 최적화)

  • Lee, Dong-Yeup;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • pp.121-123
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    • 2006
  • In this paper, the notch of teeth and skew of permanent magnet are used to reduce the detent force caused by slot-teeth structure. Also, the shape of permanent magnet is optimized to reduce the detent forceowing to flux hannonics components of permanent magnet. As a result, thrust is decrease about 2[%]. But, the distortion ratio of thrust is decreased from 1.04[%] to 0.75[%]. And, the ripple ratio of thrust is decreased from 2.6[%] to 1.65[%].

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Stability Analyses of Magnetic Levitation Tables Using Repulsions of Permanent Magnets (영구자석에 의한 반발형 자기부상 테이블의 안정성 해석)

  • Choe, Gi-Bong;Jo, Yeong-Geun;Tadahiko Shinshi;Akira Shimokohbe
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.7
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    • pp.36-42
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    • 2002
  • This paper presents two actuators for levitation using repulsions of permanent magnet and two magnetic levitation tables using the actuators. Here, one actuator for levitation consists of one fixed magnet and one moving magnet, and the other actuator consists of two fixed magnets and one moving magnet. The moving part of the magnetic levitation table contains the moving magnets. repulsive forces caused by the permanent magnets are linearized, and then the equation of motion of the moving part of the table is derived. Using the equation of motion, stability conditions of the moving part are deduced. The stability conditions are analyzed for positional relations of the moving magnets and the minimum number of active control required for stable system. As a result, in the each case of magnetic levitation tables, the requirements for stabilization are expressed by the positional relations and the number of the active controls.

Development of 3-axis Moving Magnet Type Actuator (가동 자석형 3 축 구동 엑츄에이터 개발)

  • Song, Myeong-Gyu;Hur, Young-Jun;Park, No-Cheol;Yoo, Jeong-Hoon;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.3 no.4
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    • pp.191-195
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    • 2007
  • The optical disc drive has used a high NA objective lens and a shorter wavelength laser diode for high recording density. But high NA and shorter wavelength cause several margins to become short. Focusing and tracking servo has to be more accurate and active tilt compensation mechanism is also needed for coma aberration compensation. In this paper, we proposed 3-axis moving magnet type actuator. For 3-DOF motion, moving coil actuator has to be equipped with 6 wires for supplying 3 independent signals. However, moving magnet type actuator doesn't need to change the configuration of wires because coils are in stator. So, we added a tilt mechanism to the 2-axis moving magnet actuator which is designed in previous research. Addition of the tilt mechanism cuts down the focus sensitivity. So, maximization the tilting sensitivity and securing the focusing sensitivity are objectivities of this research. DOE (design of experiments) procedures of electromagnetic circuit are performed for parameter study and the optimization is also performed to maximize the tilt sensitivity. And then the final design is suggested and its performance is verified by FE simulation.

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3-axis Moving Magnet Type Actuator (가동 자석형 3 축 구동 엑츄에이터)

  • Hur, Young-Jun;Song, Myeong-Gyu;Park, No-Cheol;Yoo, Jeong-Hoon;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1033-1036
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    • 2007
  • The optical disc drive has used a high NA objective lens and a shorter wavelength laser diode for high recording density. But high NA and shorter wavelength cause several margins to become short. Focusing and tracking servo has to be more accurate and active tilt compensation mechanism is also needed for coma aberration compensation. In this paper, we proposed 3-axis moving magnet type actuator. For 3-DOF motion, moving coil actuator has to equip 6 wires for supplying 3 independent signals. However, moving magnet type actuator doesn't need to change the configuration of wires because coils are in stator. So, we added tilting mechanism to 2-axis moving magnet actuator which is designed in previous research. Addition of the tilting mechanism cuts down the focusing sensitivity. So, maximization the tilting sensitivity and securing the focusing sensitivity are objectivities of this research. DOE (design of experiments) procedures of electromagnetic circuit are performed for parameter study and the optimization is also performed to maximize the tilt sensitivity. And then the final design is suggested and its performance is verified by FE simulation.

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