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보이스 코일 액츄에이터의 PWM 제어에서 듀티비-변위 모델 연구
황진동(Jin-Dong Hwang),곽용길(Yong-Kil Kwak),김주현(Ju-Hyun Kim),김선호(Sun-Ho Kim),안중환(Jung-Hwan Ahn) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.2
Voice coil actuator is used linear motion system that requires precision positioning control. In order to control precision positioning of voice coil actuator, relation model between duty ratio and moving displacement of voice coil actuator is needed. This paper present a duty ratio - displacement model in PWM control of voice coil actuator. Transfer function of voice coil actuator is obtained by combining voice coil motor's equation of motion with the equation of circuit and characteristic of voice coil motor. Consider to initial condition of velocity and current, transfer function is transformed mathematical model. The induced model can predict output displacement, velocity and current according to duty ratio and amplitude. The model is verified by experimental tests such as velocity and displacement response of voice coil motor. Simulated results have tracking errors of less than 10 percent of experimental results.
Design of High Speed Solenoid Actuator for Hydraulic Servo Valve Operation
Sung, Baek-Ju,Kim, Do-Sik Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
Modern electric controlled valves are demanded that its solenoid actuator should be smaller size, lighter weight, lower consumption power, and higher response time. For achieving these purposes, the major design factors of solenoid actuator such as magnetic flux density, coil turn numbers, plunger size, bobbin dimension, and etc. are must be optimized. In this study, for optimal design of high speed solenoid actuator for hydraulic servo valve operation, we draw up governing equations which are composed by combination of electromagnetic theories and empirical knowledge, and deduct the values of major design factors by use of them. For more increase the operating speed, voice coil are used as main armature in manufacturing of prototype actuator. And, we have proven the propriety of the governing equations and speed increasing method by experiments using the hydraulic valve assembly adopted the prototype of solenoid actuator.
Analysis of a 3-Degree-of-Freedom Spherical Actuator using VCM Principle
Junghyun Chu(주정현),Noboru Niguchi(니구치 노보루),Katsuhiro Hirata(히라타 카츠히로) 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.3
The superior performance of the spherical actuator is establishing a new trend in the industry. Spherical actuators can perform multiple degrees-of-freedom (DOF) motions by using only one actuator. Therefore, a multi-DOF device using the spherical actuator can reduce weight and simplify the structure. This paper proposes a new spherical actuator that uses the operational principle of a rotational voice coil motor. The effectiveness of the actuator is verified through 3-D finite element method.
모바일 카메라 모듈용 볼베어링 방식 OIS 액추에이터 설계
송명규(Myeong-Gyu Song),손동훈(Dong-Hun Son),박노철(No-Cheol Park),박경수(Kyoung-Su Park),박영필(Young-Pil Park),임수철(Soo-Cheol Lim) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.4
Optical image stabilization is a technique to compensate the image blurring caused by some vibrations of camera at the exposure time. Pitching and yawing of camera are sensitive to the image quality so they are usually compensated by optical image stabilization. Corresponding pitching and yawing of a camera, a lens or the image sensor is translated in two-axis direction and then the optical path of camera is adjusted. In this paper, two-axis OIS actuator for mobile camera module is suggested and designed. The actuator is a voice-coil actuator that uses the electromagnetic force of voice-coil to make compensation motions. And ball bearing is used to reduce friction force. Magnetic attractive force between magnets and yokes acts as a preload and magnet springs. Prototype actuator is fabricated to measure the friction force and to verify the feasibility of the OIS actuator with ball bearing. At last, the actuator is improved in consideration of driving force and friction force. Design of experiments is used for designing the actuator.
VCA(Voice Coil Actuator) 구동 평형저울에서 VCA 자기 감쇠 특성이 측정 속도에 미치는 영향
안지윤,안중환 한국센서학회 2019 센서학회지 Vol.28 No.4
In this study, in conjunction with a SIMULINK program based on system modeling of a voice-coil-actuator (VCA)-driven bal- ancing scale, a proportional-integral-derivative control algorithm is implemented, and weighing characteristics are investigatedthrough experiments and simulations. The extent to which the back electromotive force induced in the VCA-driven circuit and themagnetic damping induced by the coil wound bobbin of VCA affect the weighing speed is also investigated.
Voice Coil Actuator를 이용한 고속조준기의 구조설계 및 신뢰성 검증 연구
유준선(Junsun Yoo),임선빈(Seonbin Lim),정재우(Jae Woo Jung),정상원(Sang Won Jung),김재현(Jae Hyun Kim),윤준영(Jun Young Yoon),이승한(Seoung-Han Lee),곽도현(Do Hyun Kwak),정의봉(Eui-Bong Jeong),박노철(No-Cheol Park) 한국소음진동공학회 2021 한국소음진동공학회 논문집 Vol.31 No.4
Because laser weapons are relatively easy to use and can exert powerful energy with high efficiency versus cost, the laser weapons are being developed competitively in the defense industry. A fast steering mirror is the key component for precision tracking and automatic beam alignment, which are the main performances of laser weapons. The purpose of this study is to verify the structural design and driving reliability for implementing the target performance of a fast steering mirror using voice coil actuators. For the performance evaluation of a fast steering mirror, the driving range for the available thrust considering of the electromagnetic force and also the dynamic characteristics within the driving bandwidth were investigated through electromagnetic and structural analysis. In addition, the structural robustness was verified by securing a sufficient safety factor based on the analysis of the fatigue life for the area where the stress was concentrated.
평판형 전자기 엑츄에이터의 초기응답속도 향상을 위한 쇼티트 턴에 관한 연구
황기일(Ki Il Hwang),김진호(Jin Ho Kim),이재용(Jae Yung Lee),이정훈(Jung Hun Lee),김종백(Jong Back Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This paper presents the new design of flat electromagnetic actuator. Novel shorted tum and copper center pole are placed into existent design in order to reduce the inductance of coil and develop the initial response. Dynamic finite element analysis using commercial electromagnetic solver MAXWELL is performed to simulate the improvement of dynamic characteristics such as fast initial response and so on.
영구자석 스프링과 보이스 코일 구동기를 가진 직선형 진동모터의 설계 및 해석
최정규(Jung-kyu Choi),유승열(Seong-yeol Yoo),노명규(Myounggyu Noh) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.3
직선형 진동모터가 휴대전화의 알림용이나 햅틱 인터페이스의 구동기로 적용되려면 빠른 응답속도와 긴 수명을 제공하여야 한다. 본 논문에서는 기존 직선형 진동모터를 개선하여 보이스 코일 구동기와 영구자석 스프링을 이용한 직선형 진동모터를 제시하고, 설계 제작하여 그 가능성을 검증하였다. Halbach 배열의 영구자석에 의해 구동되는 보이스 코일 구동기와 영구자석 간의 반발력을 이용하는 영구자석 스프링을 해석하고 설계하기 위해, 등가전류판 방법과 이미지 방법을 사용하였고, 방법의 적절성을 유한요소해석을 통해 검증하였다. 시작품 모터를 설계하고 제작하고, 실험을 통해 진동모터의 특성을 확인하였다. In order to use a linear vibration motor for the actuator of a haptic interface, the motor must provide a higher reaction rate and longer service life than typical rotational motors with an eccentric mass. In this paper, we propose a linear vibration motor that is equipped with a voice-coil actuator and permanent-magnet springs. To concentrate the magnetic flux in the actuator, a Halbach-style magnetization pattern is used. Permanent-magnet springs replace mechanical springs to help increase the service life. We use the method of equivalent current sheets and the method of images to analyze and model the proposed vibration motor. These methods are validated using finite element analyses and experiments. A prototype motor is designed and fabricated. Tests with the prototype show the feasibility of the proposed linear vibration motor.
Design and Analysis of A Mini Linear Optical Pickup Actuator
Park, Joon-Hyuk,Baek, Yoon-Su,Park, Young-Pil The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.11
This paper describes a mini linear optical pickup actuator. To reduce the size, inner yokes are designed to guide the mover and outer yokes of permanent magnets are removed. Magnetic circuit method is used to determine the thrust force. Virtual path method is proposed to analyze the open magnetic circuit analysis. The magnetic circuit of the proposed actuator can be a closed circuit due to the virtual path model of the outer magnetic flux. The validity of virtual path method is evaluated by comparing to the FEM analysis. Structural vibration is investigated using FEM and the design of the mover is modified to improve the vibration characteristic. Dynamic characteristic experiments shows that the performance of the proposed actuator is enough to be used as a coarse and fine seeking actuator simultaneously and the thrust force margin for loading a focusing actuator is guaranteed.
Recent Development of Piezoelectric Fast Tool Servo (FTS) for Precision Machining
Yung-Tien Liu 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.4
With an increasing demand of photoelectric components, the micro/ultraprecision machining technology has become more and more important. However, for some particular applications such as micro lens array for light emitting device, head-up display for windscreen of a car, and compensation lens for laser light, etc., those manufactures require the so-called fast tool servo (FTS) or slow tool servo (STS) technology. Different to the STS, the FTS is to employ an auxiliary device of tool holder incorporating with the machine tool. In this review article, an overview of FTS is provided. In the beginning, the classifications of FTS based on motion- and actuator-type are presented. Practical FTSs constructed by piezoelectric, electromagnetic, and magnetostrictive actuators are described. Then, the content is expanded to the piezoelectric FTS including its main components, characteristics of piezoelectric actuator, displacement amplification mechanisms based on flexure hinge, multiple-actuator, hydraulic bellows-type, and hybrid-actuator. In addition to the applications of micro/ultraprecision machining conducted by the STS, the piezoelectric FTS that can provide further unique applications such as non-axisymmetric aspheric machining, on-machine measurement, vibration-assisted machining, axis error compensation, and active vibration control are addressed. Moreover, the control strategies for the piezoelectric FTS are introduced, and the progress of multi-axis piezoelectric FTS is described. Finally, the challenges and perspective of the FTS are mentioned, and a conclusion is made. Through this article, the fundamental knowledge of FTS can be acquired. This is helpful in further developments and practical applications of FTS.