• Title, Summary, Keyword: Actuator

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Design of a Moving-magnet Electromagnetic Actuator for Fast Steering Mirror through Finite Element Simulation Method

  • Long, Yongjun;Mo, Jinqiu;Wei, Xiaohui;Wang, Chunlei;Wang, Shigang
    • Journal of Magnetics
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    • v.19 no.3
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    • pp.300-308
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    • 2014
  • This paper develops a moving-magnet electromagnetic actuator for fast steering mirror (FSM). The actuator achieves a reasonable compromise between voice coil actuator and piezoelectric actuator. The stroke of the actuator is between the strokes of a piezoelectric actuator and a voice coil actuator, and its force output is a linear function of air gap and excitation current within our FSM travel range. Additionally, the actuator is more reliable than voice coil actuator as the electrical connection in the actuator is static. Analytically modeling the actuator is difficult and time-consuming. Alternatively, numerous finite element simulations are carried out for the actuator analysis and design. According to the design results, a real prototype of the actuator is fabricated. An experimental test system is then built. Using the test system, the force output of the fabricated actuator is evaluated. The test results validate the actuator analysis and design.

A Study on the Magnetic Suspension Type Linear Actuator for a Non-contact Surface Actuator (비접촉 평면구동기를 위한 자기 서스펜션방식 직선구동기)

  • Lee, Sang-Heon;Jung, Kwang-Suk;Baek, Yoon-Su
    • Proceedings of the KSME Conference
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    • pp.735-740
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    • 2001
  • With the development of micro-technology, the demand for micro actuator is increasing. But, it is difficult to achieve high resolution and long travel range simultaneously with the conventional actuators. So, the noncontact surface actuator was proposed. This actuator can realize high dynamic range and the planar motion without complex cross-axis linear slides. This paper describes a magnetically suspended linear actuator for developing a non-contact surface actuator. The operating principle and the structure of the proposed linear actuator are similar to switched reluctance motor, but the proposed linear actuator utilizes normal force and propulsion force simultaneously. With this characteristic, the system can be simpler than other non-contact surface actuator.

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Development of Linear Magnetic Actuator for Active Vibration Control (능동진동제어를 위한 선형 자기 액츄에이터 개발)

  • Lee, Haeng-Woo;Kwak, Moon-K.;Kim, Ki-Young;Lee, Han-Dong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.587-592
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    • 2009
  • This paper is concerned with the development of linear magnetic actuator for active vibration control. The newly developed linear magnetic actuator consists of permanent magnets and copper coils. On the contrary to the voice-coil type actuator, the linear magnetic actuator utilizes magnetic flux to generate the shaft movement. In this study, experiments on the prototype linear magnetic actuator were carried out to investigate its dynamic characteristics. Block and inertia forces generated by the actuator were measured. The experimental results show that the actuator can be used as both actuator and active tuned-mass damper. The linear magnetic actuator was attached to a cantilever as the active-tuned mass damper and active vibration control experiment was carried out. The experimental results show that the newly developed linear magnetic actuator can be effectively used for the active vibration control of structures.

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Design and Position Control of AF Lens Actuator for Mobile Phone Using Dielectric Elastomer (Dielectric Elastomer를 이용한 카메라 폰 AF 렌즈 구동기의 설계 및 제어)

  • Shim, Hyun-Jae;Kim, Chul-Jin;Jeong, Jun;Yang, Hyun-Seok;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.739-739
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    • 2005
  • In the conventional AF lens actuating system the VCM actuator is used. However due to the actuating mechanism, the VCM actuator has disadvantage in miniaturizing which is essential to the actuator for the mobile device. Therefore novel type actuator is required and the one of the candidate is actuator using electoractive polymer (EAP). The EAP actuator is one of the attractive smart materials that is light and can be easily fabricated with low cost. This paper proposes an AF lens actuator for mobile phone using dielectric elastomer. The proposed actuator was designed and analyzed using finite element method. The designed actuator is verified by experiment and the position control algorithm is applied.

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Position Control of Laser Scanning Mirror Using Piezoelectric Actuator (압전작동기를 이용한 레이져 스케닝 미러의 위치제어)

  • 지학래;김재환;최승복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.442-445
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    • 1995
  • This paper presents the position tracking control of a laser scanning mirror system in which piezoelectic actuator is incorporated. Using the shear mode of the piezoelectric actuator,angular oscillation of a laser scanning mirror is derived. Torsion bar is rhen designed and attached to the piezoelctric actuator in order to magnify the amplitude generated by the actuator. Finite element modeling and analysis are essntial for designing the piezoelectic actuator. The torsional resonance mode of the piezoelectric actuator is found from the model analysis of the actuator and the mechanical shear is matched with the driving frequency. Transfer function between the electrical excitation and the mechanical shear deformation at resonance frequency is found form the response of the actuator calculated by the finite element analysis and the governing equation of the system is derived from d'Alembert's principle. Tracking control performance for desired trajectory which is, in fact, sinusoidal curve is presented in order to demonstrate the validity of the proposed system.

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Mechanism Design of Optical Pickup Actuator for Fast Access of Optical Disk Drive (광디스크 드라이브의 고속 액세스를 위한 광픽업 액추에이터 메커니즘 설계)

  • 박준혁;이상헌;백윤수
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.12
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    • pp.109-119
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    • 2002
  • In this paper, mechanism design of optical pickup actuator for fast access is proposed. This actuator is composed of moving magnet type actuator and moving coil type actuator for tracking and fine motion, respectively. Moving magnet type tracking actuator is configurated by two permanent magnets and four air-core solenoids. Additional damper by induced current in tracking actuator can reduce the transient vibration between the coarse seeking servo and fine seeking servo. Variable stiffness can be acquired by applying current to air-core solenoid simply. This actuator can achieve fast access by these additional damper and stiffness. Performance of this actuator is predicted through the FEM, simulation and simple experiment. Settling time for transient vibration is reduced to 14.7% according to simulation result.

Comb actuator design methodology for variable optical attenuator(VOA) application (Variable optical attenuator(VOA) 응용을 위한 comb actuator 설계 방법)

  • Kim, Sang-Bum;Han, Seung-Oh;Oh, Sang-Woo;Pak, Jung-Ho
    • Proceedings of the KIEE Conference
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    • pp.306-308
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    • 2003
  • 본 논문은 variable optical attenuator(VOA)에 응용하기 위한 comb actuator를 설정하기 위해, 요구되는 조건에 가장 적합한 comb actuator를 설계하기 위한 방법을 제시한다. VOA 응용을 위한 comb actuator 설계에서 고려되어야 하는 조건들은 comb actuator의 performance(변위, 공진 주파수), 구동 전압 그리고 공정의 한계(최소 선폭, 최소 간격, 두께) 등이다. 이러한 조건들이 정해지면, 이 조건들을 comb actuator의 구동력과 지지빔 스프링에 의한 복원력에 대입하여 두 힘이 평형일 때의 조건으로부터 comb finger의 수와 구동부의 질량 및 지지빔의 길이 등의 선계 변수들을 정할 수 있다. 그리고 comb actuator의 질량으로 부터 구동부의 면적을 구할 수 있고, 이러한 조건에서 구한 지지빔의 면적과 비교하여 적절한 구동부의 면적을 설정한다. 이상의 내용을 조합해서 요구된 조건이 comb actuator 설계에 적합한지의 여부를 확인했고, VOA 응용을 위한 요구 조건에 맞는 comb actuator 설계를 했다.

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The Solution of Reliability Problem for the Actuator Latch Device of Hard Disk Drive Using TRIZ (트리즈를 활용한 하드디스크 드라이브 액추에이터 래치 장치의 신뢰성 문제 해결)

  • Jeong, Hai Sung
    • Journal of Applied Reliability
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    • v.14 no.3
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    • pp.147-151
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    • 2014
  • An actuator latch device of a hard disk drive is installed for locking an actuator to hold a magnetic head parked in a parking zone. Applying an external force to the drive, the head can move away from the parking zone and destroy data on the disk. A magnet latching mechanism is used to prevent the actuator from moving when the computer is not in use. A permanent magnet holds the actuator when the head is in the parking zone. When the computer is turned on, the actuator has to overcome the latch magnet in order to move. A stronger latch magnet will hold the actuator adequately, but the actuator will not be released when unlocking is required. A breakthrough solution is needed to improve the reliability of the drive without any deterioration of its performance. In order to obtain the idea for resolving this technical contradiction, we analyse patents for actuator latch device of a hard disk drive. A practical way for solving contradictions in product development using TRIZ is proposed in this paper.

Actuator and sensor failure detection using direct approach

  • Li, Zhiling;Nagarajaiah, Satish
    • Structural Monitoring and Maintenance
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    • v.1 no.2
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    • pp.213-230
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    • 2014
  • A novel real-time actuator failure detection algorithm is developed in this paper. Actuator fails when the input to the structure is different from the commanded one. Previous research has shown that one error function can be formulated for each actuator through interaction matrix method. For output without noise, non-zero values in the actuator functions indicate the instant failure of the actuator regardless the working status of other actuators. In this paper, it is further demonstrated that the actuator's error function coefficients will be directly calculated from the healthy input of the examined actuator and all outputs. Hence, the need for structural information is no longer needed. This approach is termed as direct method. Experimental results from a NASA eight bay truss show the successful application of the direct method for isolating and identifying the real-time actuator failure. Further, it is shown that the developed method can be used for real-time sensor failure detection.

Development of Linear Magnetic Actuator for Active Vibration Control (능동진동제어를 위한 선형 자기 액추에이터 개발)

  • Lee, Haeng-Woo;Kwak, Moon-K.;Kim, Ki-Young;Lee, Han-Dong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.19 no.7
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    • pp.667-672
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    • 2009
  • This paper is concerned with the development of linear magnetic actuator for active vibration control. The newly developed linear magnetic actuator consists of permanent magnets and copper coils. On the contrary to the voice-coil type actuator, the linear magnetic actuator utilizes magnetic flux to generate the shaft movement. In this study, experiments on the prototype linear magnetic actuator were carried out to investigate its dynamic characteristics. Block and inertia forces generated by the actuator were measured. The experimental results show that the actuator can be used as both actuator and active tuned-mass damper. The linear magnetic actuator was attached to a cantilever as the active-tuned mass damper and active vibration control experiment was carried out. The experimental results show that the newly developed linear magnetic actuator can be effectively used for the active vibration control of structures.