• Title/Summary/Keyword: moving-coil-type

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Design of Moving Coil Type Optical Pickup Actuator for Flexible Disk (유연디스크용 가동 코일형 광 픽업 엑추에이터 개발)

  • Kim, Yoon-Ki;Song, Myeong-Gyu;Lee, Dong-Ju;Park, No-Cheol;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.479-483
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    • 2006
  • As high-definition television(HDTV) broadcasting were generalized, there have been many researches and developments about large storage capacity and fast data transfer rate in optical disk drives(ODD). Pickup actuators must have high flexible mode frequencies and gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method that considers the bonding layer. And, flexible mode frequency of actuator is improved by Design of Experiment of lens holder. Magnet circuit is designed considering the relation with moving part. Through improving yoke design, the magnetic flux is changed and DC tilt is reduced. Consequently, we designed actuator which has high flexible mode frequency and gain margins.

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Design of Moving Coil Type Optical Pickup Actuator for Flexible Disk System (유연디스크용 가동 코일형 광 픽업 엑추에이터 개발)

  • Kim, Yoon-Ki;Song, Myeong-Gyu;Lee, Dong-Ju;Yoo, Jeong-Hoon;Park, No-Cheol;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.2 no.4
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    • pp.240-244
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    • 2006
  • As high-definition television(HDTV) broadcasting becoming more generalized, there have been many researches and developments about a large storage capacity and a fast data transfer rate in optical disk drives (ODD). Pickup actuators must have high flexible mode frequencies and large gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method in considering of the bonding layer. And, the flexible mode frequency of actuator is improved by Design of Experiments of lens holder. The Magnet circuit is designed considering the relation with the moving part. Through improving the yoke design, the magnetic flux is changed and the DC tilt is reduced. Consequently, we designed an actuator which has a high flexible mode frequency and a large gain margins.

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Dynamic Analysis of Linear Oscillatory Actuator for Stirling Refrigerator (스털링 냉동기용 리니어 왕복 액추에이터의 동특성 해석)

  • Jeong, S.S.;Yoon, I.K.;Jang, S.M.;Park, S.J.;Hong, Y.J.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.673-675
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    • 2002
  • In this paper. the lumped electrical circuit approach of mass/spring system is used to model the mechanical aspects according to the frequency. Therefore, the mass/spring system can be dealt with here and linked with the equivalent circuit of electric linear oscillatory actuator(LOA). Analysis models are double-coil type linear compressor for stirling refrigerator. The compressor consists of the moving coil LOA, piston, and spring. The electro-mechanical system with mass and spring can be represented using the lumped electrical circuit. We present the system impedance and dynamics of moving coil linear compressor.

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Design and Characteristics of Linear Motor Damper for Vibration Control (진동제어용 리니어 모터 탬퍼의 설계 및 특성)

  • Jang, S.M.;Jeong, S.S.;Park, H.D.;Ham, S.Y.;Kim, H.I.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.880-882
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    • 2001
  • A moving-coil-type linear oscillatory actuator is consisted of the NdFeB permanent magnets with high specific energy as the stator, a coil-wrapped nonmagnetic hollow rectangular structure and an iron core as a pathway for magnetic flux. The inductance of moving coil and the push/pull effect is obtained from the permeance model of LOA with the open magnetic circuit. The analytical method are verified using the 2D finite element method.

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Experiments and Dynamics Simulation of a Moving Flat Core Type LOA (평판철심 가동형 리니어 액츄에이터의 동특성 시뮬레이션 및 실험)

  • Jang, S.M.;Cho, H.W.;Lee, S.H.;Kweon, C.
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.663-665
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    • 2002
  • Moving flat core type LOA consists of iron flat core as a mover and electric magnet as a stator and operated by electromagnetic force between mover and stator. First, this paper describes the voltage equation of coil and the mechanical equation of motion. Secondly, the dynamic simulation algorithm is proposed, and system control constant-inductance, resistance-were carried by exciting coil. Finally, we turned out the driving system and the dynamic characteristics of current, voltage and displacement is confirmed by experiment.

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Characteristic Analysis and Static Tests of a Flat Moving Core Type LOA (평판 철심가동형 LOA의 특성해석 및 정특성 시험)

  • Jang, S.M.;Jeong, S.S.;Jeong, J.M.;Kim, H.K.;Wu, J.S.
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.52-54
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    • 1998
  • LOA is the linear electromechanical device that mover is similar to secondary conductor of LIM. The mover reciprocates along stroke by supplying the alternating current to primary coil. LOA is the simpler and more efficient than other linear apparatus using the rotary motor because LOA produce the thrust force without any mechanical converter such as cam, clutch, belt, rack and pinion, etc. This paper deals with the static characteristics of moving coil type LOA by virtual work method, FEM analysis and experiment Results show that thrust force increases when mover travels form center to both ends.

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The Design and Magnetic Field Analysis of Moving Coil Type LDM by relation between thrust constant and size (가동코일형 LDM의 추력정수와 치수관계에 의한 자계해석과 설계)

  • Ryu, J.S.;Baek, S.H.;Kim, Y.;Yoon, S.Y.;Maeng, I.J.;Kim, I.N.
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.82-84
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    • 1998
  • LDM(Linear DC Motor) are used in high speed, high-precision position control system. Because of these advatages, LDM has already used in the motor of pen-recorder, magnetic-disk devices. Under the limited dimension, we propose the design method of LDM by magnetic circuit. In this paper, a relation between the thrust constant and size of a LDM that is moving coil type with unipolar is described, which is defined as a simple relational equation. To maximize the rate of thrust to the volume of LDM, the magnetic flux density in the yoke is adjusted to the value of magnetic equation By the magnetic field analysis(FEM), the validity of the equation is confirmed.

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Design of Electromagnetic Moving-coil type Voice Coil Motor for Scanning mirror of Barcode reader (바코드 리더용 스캐닝 미러를 위한 무빙 코일 타입 VCM 설계)

  • Shin, Bu Hyun;Lee, Jeong Woo;Shim, Hyun Ho;Park, Sang Goo;Lee, Seung-Yop
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.1
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    • pp.17-22
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    • 2016
  • A voice coil actuator with moving coil type for scanning mirror system of barcode reader has been developed. The actuator has a simple structure including a magnet, a coil and a pin. The performance of the actuator is analyzed by a linearized theoretical model. And the dynamic performance of the proposed actuator is predicted through motor constant and restoring constant obtained by finite element simulations. The theoretical model was verified by the prototype which has 64 Hz resonance frequency and 60 deg reflecting angle. We also discovered that that 3 V input can make the actuator rotate over 61.8 deg reflecting angle at 50 Hz resonance frequency. The proposed actuator can simplify its driving configuration because of its implementation of open-loop control.

Multifunctional Robotic Guidewire System using Spiral-type Magnetic Microrobot with Magnetic Manipulation

  • Yu, Chang-Ho;Kim, Sung Hoon
    • Journal of Magnetics
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    • v.21 no.4
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    • pp.616-621
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    • 2016
  • This paper presents a new multifunctional active guidewire system for medical applications that uses a magnetic microrobot. The study demonstrated that the proposed microrobot system could swim and be controlled under Low-Reynolds-number (Re) environments in blood vessel models. The prototype of the robotic guidewire, which is driven within a three-axis Helmholtz coil system, consists of a guide-wire, spiral blade, drilling tip, and permanent magnet. The spiral-type microrobot showed stable active locomotion between 3 kA/m and 9.1 kA/m under driving frequency up to 70 Hz in a silicone oil (of viscosity 1000 cst). The microrobot produced a maximum moving velocity of $8.08{\times}10^{-3}m/s$ at 70 Hz and 9.1 kA/m. In particular, the robotic guidewire produced 3D locomotion with drilling in the three-axis Helmholtz coil system. We verified active locomotion, towing of guidewire, steering, and drilling of the proposed robotic guidewire system through experimental analyses.

Design and Characteristic Analysis of a Moving Magnet Type LDM (가동자석형 LDM의 설계 및 특성 해석)

  • Jang, S.M.;Jeong, S.S.;Yoon, I..K.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.18-20
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    • 1999
  • In the industrial field the necessity of the linear motion is increasing. We selected a moving magnet coreless type LDM, which have the advantages, such as long stoke, brushless, no cogging force. Actually, the design is accomplished using FEM analysis for the basic configuration of a magnetic circuit, and characteristic equations for coil design. In the course of design we have estimated airgap flux density and thrust.

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