• Title/Summary/Keyword: Voice Coil Motor(VCM)

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State Feedback-Based Position Controller of VCM(Voice Coil Motor) for Precise Automated Manufacturing Process (조립구동용 VCM 정밀구동을 위한 상태궤환 방식의 위치제어기)

  • Kim, Sung-Kuk;Rajendra, Shrestha;Seok, Jul-Ki
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.9
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    • pp.129-135
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    • 2010
  • The state feedback-based position controller for the voice coil motor(VCM) used in precise automated manufacturing processes is proposed and analyzed in this paper. The proposed controller has advantage over the conventional cascade-type P-PI controller in terms of the gain selection and the controller interference. The feasibility of the presented idea is verified by experimental results on a designed VCM.

Simulation of tracking errors for non-circular cutting using voice coil motor (VCM을 이용한 비원형 형상 가공의 궤적 오차 시뮬레이션)

  • Hwang J.D.;Kwak Y.K.;Kim S.H.;Ahan J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.57-58
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    • 2006
  • A Simulation model is developed to minimize the path tracking errors when the non-circular cutting is done by a VCM(voice coil motor) driven tool. The relationship between PWM(Pulse Width Modulation) duty ratio and velocity of voice coil motor is theoretically derived from combining the circuit equation for the coils and the motion equation for the magnetic rod of the voice coil motor. The path tracking errors are showed differently according to the rotational speed, the number of segments and the control period in digital control. Given a required accuracy in the non-circular cutting, the optimal values for those parameters are determined based on the developed simulation model.

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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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Electromagnetic Analysis on the VCM for Auto-focus Lens (자동초점 조절용 VCM의 전자기 해석 연구)

  • Kwon, Soon Ki
    • Journal of Digital Convergence
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    • v.10 no.11
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    • pp.331-335
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    • 2012
  • Many researches have been performed the analysis and experiments on auto-focus lens due to the development of camera module which is used in mobile-phone recently. Various types of voice coil motor are used mostly in the view point of actuators. Various type of magnetic flux flow is made by the combination of magnet, coil and yoke, etc. And the function of auto-focus is made by the proper combination of the lens components. In this research, some of the simple and economic structure is chosen to investigate the characteristics analytically among various types of lens which are used in industries. Desired level of lens module design was achieved by electromagnetic analysis using ANSYS$^{TM}$ finite element analysis program.

Design and Characteristic Analysis of a Cylindrical Voice Coil Motor (원통형 보이스 코일 모터 설계 및 특성 해석)

  • Lee Hong Kyo;You Yong Min;Kwon Byung Il
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.1034-1036
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    • 2004
  • The most basic form of a direct-drive linear motor is the voice coil motor(VCM). The voice coil motor employs a stationary permanent magnet field assembly in conjunction with a moving coil winding assembly to produce a force proportional to the current applied to the coil. Voice coil motor provide motion capable of extremely fine position sensitivity, limited only by the feedback sensor used to close the control loop. This paper presents dual-servo voice coil motor for improvement of driving range and position resolution. The voice coil motor is a cylindrical shape to improve reliability of a nanoindenter.

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3-D Nano Topology Measurement using VCM (VCM(voice coil motor)를 이용한 3차원 나노 형상 측정 시스템)

  • Jung, Jong-Kyu;Youm, Woo-Sub;Park, Kiy-Hwan
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1439-1443
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    • 2007
  • In this paper, vibration reduction techniques of a voice coil motor (VCM) actuator are presented for AFM imaging system. The damping coefficient of the actuator driven by VCM with a flexure hinge is quite low and it cause the about 30dB peak amplitude response at the resonance frequency. To decrease this peak response, we design and apply elliptical band-stop filters to xy and z axis VCM actuator. Frequency response of each actuator with filter is measured to verify the effect of the filters. As a sensor, capacitive sensor is used. Vibration reduction rate of the xy actuator with the filter is also measured while real AFM scanning condition. As another method, closed loop control with the capacitive sensor is applied to the xy axis actuator to add an electrical damping effect and vibration reduction rate measured. These vibration reduction rates with each method are compared. In the case of z axis actuator, the frequency response of force (gap) control loop is measured. For comparison, the frequency response using a conventional PID controller is also obtained. Finally, the AFM image of a standard grid sample is measured with the designed controller to analyze the effect in the AFM imaging.

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Mathematical modeling and experimental verification far Precision Positioning Control of VCM (보이스 코일 모터의 정밀위치 제어를 위한 수학 모델링 및 검증)

  • Hwang J.D.;Kim J.H.;Kwak Y.K.;Kim S.H.;Ahan J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.375-378
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    • 2005
  • Voice Coil Motor is used linear motion actuator system that require precision positioning control. In order to control precision positioning of voice coil motor, Mathematical model of voice coil motor is needed. Mathematical model is obtained by combining voice coil motor's equation of motion with the equation of circuit and characteristic of voice coil motor. The induced model can predict output displacement according to duty ratio and amplitude. The model is verified by experimental test. Simulated results have tracking errors of less than 10 percent of experimental results.

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Characteristic Analysis of Voice Coil Motor with Position Resolution of High Precision (고정밀 위치 분해능을 갖는 보이스 코일 모터의 특성 해석)

  • Lee, Hong-Kyo;Oh, Ju-Hwan;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2005.04a
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    • pp.43-45
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    • 2005
  • A High precision position control technique is used in many kind of industry areas. Especially this is to be one of the important parts in the development of precision machines. To get high precision and long range, dual servo voice coil motor(VCM) has been designed and implemented. In this paper, as a simulation and experimental result, the developed dual servo VCM shows the applicable possibility for precision machine system.

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A Dual-Servo Type VCM for a Nano-Level Measurement System

  • Yoo, Yong-Min;Kwon, Byung-Il
    • Journal of Electrical Engineering and Technology
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    • v.2 no.1
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    • pp.50-54
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    • 2007
  • In this paper, a dual-servo type VCM (Voice Coil Motor) for the measuring of nano-level displacement and small thrust is proposed and developed. The shape of VCM for improving the resolution of displacement and ensuring a large displacement are presented. The FEM (finite element method) is utilized to analyze the characteristics of VCM that produces linear driving thrust and satisfies the thrust that the measurement system requires. The Prototype is fabricated and an experiment is performed in order to measure displacement. As a result of simulation and testing, the proposed VCM shows the applicable possibility for a nano-level measurement system.

Design of VCM(Voice Coil Motor) for improvement in resolution and driving in a large displacement (분해능 향상 및 대구동 변위를 위한 보이스코일 모터의 설계)

  • You, Y.M.;Cho, J.H.;Kwon, B.I.
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.137-139
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    • 2003
  • In this paper, a design of VCM(Voice Coil Motor) for the measurement system of nano-level force and displacement was proposed and developed. This paper present the VCM shape for improvement of position resolution and guarantee of a large displacement. And then the finite element analysis method(FEM) utilized to produce linear driving thrust and satisfy required thrust of the system. The result shows the applicable possibility of the proposed VCM as a study for nano-level measurement system.

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