• Title/Summary/Keyword: Rotary Actuator

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Development of the Pneumatic Rotary Actuator for Marine Winch

  • Kim, D.-S;Lee, W.-H
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.2
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    • pp.354-360
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    • 2004
  • It is well known that pneumatic actuators convert fluid power into mechanical power with a low efficiency. The pneumatic rotary actuators are used in not only marine winches. but also hoists, agitators, and excavators. The efficiency of pneumatic rotary actuators depends on several factors, such as type of actuator. speed, supply pressure. size and geometry of the actuator. This paper presents an analytical and experimental study of the performance of pneumatic rotary actuators. We investigate all the major aspects of the air flow through a pneumatic rotary actuator and points out the main causes of the low efficiency of the actuator. Therefore the design parameters which can lead to optimum performance are obtained.

Design of Torque Servo for Impedance Control of Double Vane Rotary Hydraulic Actuator System (더블 베인 회전형 유압 구동시스템의 임피던스 제어를 위한 토크 서보 설계)

  • Kim, Seon-Min;Choi, Young-Jin;Chung, Wan-Kyun
    • The Journal of Korea Robotics Society
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    • v.5 no.2
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    • pp.160-168
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    • 2010
  • In order to achieve a force controller with high performance, an accurate torque servo is required. However, the precise torque servo for a double vane rotary actuator system has not been developed till now, due to many nonlinear characteristics and system parameter variations. In this paper, the torque servo structure for the double vane rotary actuator system is proposed based on the torque model. Nonlinear equations are set up using dynamics of the double vane rotary hydraulic actuator system. Then, to derive the torque model, the nonlinear equations are linearized using a taylor series expansion. Both effectiveness and performance of the design of torque servo are verified by torque servo experiments and applying the suggested torque model to an impedance controller.

Development of Rotary Actuator Including Function of Axial Bearing (축방향 베어링 통합 회전 구동기의 개발)

  • 허진혁;정광석;백윤수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1083-1086
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    • 2003
  • Recently, the study on bearingless motors which integrate both motor and magnetic bearing function in one stator is very active, as many machines have high rotational speed, high precision, smaller size and lighter weight. In this paper, we propose a novel rotary actuator including function of axial bearing using Lorentz force as a preceding research for development of a bearingless motor. As using Lorentz force, this type has some merits such as the linearity of control force, freedom from flux saturation and high efficiency unlike conventional rotary actuators using a reluctance force. This type is cotrolled independently in levitation and rotational directions respectively. It shows by mathematical expression of levitation force and torque in the proposed rotary actuator. And also, the levitation force is generated by magnetic interaction between the magnetic materials and the rotational torque is generated by Lorentz force. Finally. for verification of this proposed system, a prototype is made and some experiments will be performed in the near future.

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Design of rotary actuator for CF II type ODD (CF II 카드 규격의 광디스크 드라이브를 위한 로터리 엑추에이터 설계)

  • Kim Sa-Ung;Oh Jeseung;Lee Dong-Ju;Hong Hyuksoo;Park No-Cheol;Yoo Jeonghoon;Park Young-Pil
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.64-68
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    • 2005
  • This paper proposes the rotary actuator to apply the designed actuator to the drive of the CF II size. New focus magnetic circuit is considered at this research. The rotary actuator including this circuit is designed to have the dynamic characteristic satisfying the mechanical specification as well as the portable devices. Finally, the adaptability to the portable devices was demonstrated by the finite element analysis and optimization of structural part.

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Development of Rotary VCM type Actuator for Small Form Factor ODD (초소형 ODD 용 로터리 VCM 타입 엑추에이터 개발)

  • Kim, Yoon-Ki;Kim, Sa-Ung;Lee, Dong-Joo;Park, No-Cheol;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.672-675
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    • 2006
  • It is becoming more significant to develop a rotary VCM type actuator for small form factor ODD, as portables are getting more and more popularized nowadays. In this paper, the procedure of development of the actuator which is applicable to compact flash II card and is fit in the specification of BD 1X is explained. This is based on the rotary VCM type actuator, which is good for reducing thickness. Air core solenoid coil is used in order to do focusing mechanism. And the total weight is reduced by using the structure of steel-aluminium-steel triple layer, so, the stiffness is still adequate. Additionally, the tracking coil is moved next to the actuator, so the total length was reduced, then the actuator become applicable to compact flash II card. The force of Magnetic Circuit is improved by using Magnetic Circuit DOE. And flexible mode frequency improved through the DOE of structure part. Modeling was exactly done in consideration of air core solenoid coil and pivot bearing. It is confirmed that the designed model is satisfied with the specification of BD 1X and is applicable to Compact Flash II card.

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A Study on Trajectory Characteristics of the Six-Degrees-of-Freedom Fine Motion Mechanism for the Ultra Precision Positioning Decision (초정밀 위치결정을 위한 6자유도미동기구의 궤적 특성에 관한 연구)

  • 김재열;윤성운
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.3
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    • pp.33-39
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    • 1994
  • The purpose of this research is to examine precise linear motion and rotary motion. A six-degrees-of-freedom fine motion mechanism is introduced to drive an object precisely in directions of X, Y and Z-axes and around them : three rectangular linear motion and rotary ones. An experimental mechanism is introduced in which a $70$\times$70$\times$70$\times$(${mm}^3$) cube object is driven by six PZT actuator. The study is to establish the six-degrees-of-freedom fine motion mechanism of linear motion and rotary motion using PZT actuator.

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Design and Analysis of Swingarm Type Rotary Actuator for Micro ODD (초소형 광디스크 드라이브용 스윙암 방식 로터리 엑츄에이터 설계 및 분석)

  • 김동욱;홍어진;박노철;박영필;김수경
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.780-785
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    • 2003
  • Recently the trends in information storage devices need small size, mobility, high capacity, and low power consumption etc. To satisfy those, the development of high performance actuator is an important issue. Compared with general linear actuator for optical disk drive, swingarm type rotary actuator is suitable to design in small form factor and has fast access time for random access. Swingarm actuator is designed considering the structural problem and the actuating force of VCM(Voice Coil Motor). The increase of mass caused by optical components makes vibration problems of swing-arm, therefore resonance frequency should be increased and inertia has to be reduced. ANSYS FEM tool is employed in optimizing swingarm. The VCM is designed using 3-D electro-magnetic analysis, and parameters of magnetic circuit are determined to matte large flux density. The large flux density enables to achieve low power consumption. VCM holder is designed to get the mass balance of total actuator and this balance reduces the magnitude of critical mode relative to pivot bearing, It is expected that swingarm type rotary actuator designed by this method is available to variable type of micro optical disk drives.

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Design and Performance Test of a Rotary Actuator for Side Tilting Excavator Bucket (좌우 틸팅이 가능한 굴삭기 버켓용 로터리 액츄에이터 설계 및 시험)

  • Park, Min Su;Lee, Jun Seok;Kim, Do Youp;Lee, Eung Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.34 no.1
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    • pp.47-51
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    • 2017
  • Generally, a working excavator has only one directional bucket tilting angle, which is up-forward. However, side direction rotation of the bucket would allow variety of working output. We designed a hydraulic rotary actuator comprising a double rod hydraulic cylinder with a rack-pinion gear set for use in excavator bucket with side tilting mechanism, thus converting the linear to angular motion. The proposed side tilting rotary actuator was designed with parts suitable for medium size of heavy duty excavator. These mechanical parts were inexpensive to purchase and the manufacturing cost was reasonable. The proposed mechanism is potentially useful for excavator with variety of working output.

Position control of an Electro-Hydrostatic Rotary Actuator using adaptive PID control (EHRA의 위치제어를 위한 적응 PID 제어기 설계)

  • Ha, Tae Wook;Jun, Gi Ho;Nguyen, Minh Tri;Han, Sung Min;Shin, Jung Woo;Ahn, Kyoung Kwan
    • Journal of Drive and Control
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    • v.14 no.4
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    • pp.37-44
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    • 2017
  • This paper introduces a control algorithm for trajectory control of an electro-hydrostatic rotary actuator. A key feature of this paper is that an adaptive PID based on sliding mode is used to control the nonlinearity and uncertainty factor of single input/output system. Accurate knowledge of rotary actuator angle can result in high-performance and efficiency of electro hydraulic system. First, the position control is formulated using the adaptive PID with sliding mode technique and uncertainties in the hydraulic system. Second, the controller can update the PID gains on-line based on error caused by external disturbance and uncertain factors in the system. Finally, three experimental cases were studied to evaluate the proposed control method.