• Title/Summary/Keyword: servo drive

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A Study on Reducing Profile Error of Multi Spindle Control in NC Machine Tools (NC 공작기계(工作機械) 동시다축제어(同時多軸制御)에서의 오차 저감)

  • Park, Jong-Bong
    • Journal of the Korean Society of Industry Convergence
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    • v.3 no.2
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    • pp.115-121
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    • 2000
  • This paper presents reducing method of profile error on a mechanical tuning for multi-spindle control of NC machine tools. To reduce the profile error in the feed drive system, it is useful to adopt same transfer function of multi spindle machine tools. By selecting the correction vector of servo rigidity and natural vibration on JK map, multi spindle control can be tuned by mechanical parameters with small profile error.

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Servo Design for High-TPI Hard Disk Drives Using a Delay-Accommodating State Estimator (위상지연이 고려된 상태관측기를 이용한 고밀도 HDD용 서보설계)

  • Kim, Y. H.;S. W. Kang;S. H. Chu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.320.1-320
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    • 2002
  • In a hard disk drive (HDD) control system, a state-space controller/observer design is popularly adopted fur its advantages such as effective filtering of position and velocity, use of estimation error to handle servo defects, etc. In this report, a systematic method is proposed to accommodate the transport delay in the plant dynamics into the state estimator. (omitted)

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Design of Disturbance Observer Considering Robustness and Control Performance (2) : It's Application for Optical Disc Drive Servo System (강인성과 제어 성능을 고려한 외란 관측기의 설계 (2) : 광 디스크 드라이브 서보 시스템에의 적용 실험)

  • 김홍록;최영진;서일홍;정완균;박명관;이경호
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.4
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    • pp.270-276
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    • 2003
  • The disturbance observer (DOB) has been widely utilized fer high precision and high speed motion control application. However, it still lacks the analysis for the robustness brought by using DOB. This paper summarizes six guidelines for the design of DOB taking into account the robustness and control performance in case of the second order system. For effectiveness of the proposed guideline, the actual implementation and experimental results of the DOB is compared in the Optical Disk Drive(ODD) servo system. In the DVD player and DVD-ROM drive, the guidelines of DOB are useful, and the disturbance rejection performance is improved under the DOB system.

Optimal Design of Suspension for Micro Optical Disk Drive (마이크로 광디스크 드라이브 서스펜션의 최적 설계)

  • Jeon, Joon-Ho;Chun, Jung-Il;Park, No-Chul;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.570-575
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    • 2002
  • Servo performance of a disk drive is greatly affected by the mechanical resonance frequencies of the head gimbal assembly (HSA). It is important factor to allow broader bandwidths for servo system in improving overall drive performance. In this paper, an optimal design for ODD suspension is attempted to increase resonance frequencies in tracking direction. Initial model was designed and the design parameter was defined to the model. The mode frequency variation for the change of design parameter was observed by modal analysis using the finite element method(FEM). The sensitivity matrix was calculated from the observed data and so through sensitivity analysis, an optimized ODD suspension was designed to have the higher resonant frequency than the initial model.

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Design of Continuous Variable Structure Tracking Controller With Prescribed Performance for Brushless Direct Drive Drive Servo Motor

  • Lee, Jung-Hoon
    • Journal of Electrical Engineering and information Science
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    • v.3 no.1
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    • pp.58-66
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    • 1998
  • A continuous, accurate, and robust variable structure tracking controller(CVSTC) is designed for brushless direct drive servo motors(BLDDSM). Although conventional variable structure controls can give the desired tracking performances, there exists an inevitable chattering problems in control input which is undesirable for direct drive systems. With the presented algorithm, not only the chattering problems are removed by using the efficient compensation of the disturbance observer, but also the prescribed tracking trajectory can be obtained using the sliding dynamics when an initial of the desired trajcetory is different from that of a BLDDSM. The design of the sliding mode tracking controller for the prescribed, accurate, and robust tracking performance without the chattering problem is given based on the results of the detailed stability analysis. The usefulness of the suggested algorithm is demonstrated through the computer simulation for a BLDDSM under load variations.

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Optimal Design of Suspension for Micro Optical Disk Drive (마이크로 광디스크 드라이브 서스펜션의 최적 설계)

  • Jeon, Joon-Ho;Chun, Jeong-Il;Park, No-Chul;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.359.1-359
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    • 2002
  • Servo performance of a disk drive is greatly affected by the mechanical resonance frequencies of the head gimbal assembly(HGA). It is important (actor to allow broader bandwidth for servo system in improving overall drive performance. In this paper, an optimal design for ODD suspension is attempted to increase resonance frequencies. It was decided that the first resonant frequency in tracking direction was higher than 5㎑. (omitted)

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Time Delay Controller Design for the High Speed Precision Servo-Control of the Direct Drive Multi-axis Manipulator (고속정밀 서보제어를 위한 직구동 다관절 메니플레이터의 시간제어기 설계)

  • 이태경;김학성;정상철;최용제;안태영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.1004-1011
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    • 1996
  • This paper covers the technology developmental stage work for the automatic ammunition loading system mainly focusing on the controller design of the electro-hydranlic type direct drive multi-axis manipulator. Mathematical model of the plant derived and PIDM servo-controller structured. Comparative study between the analytical and experimental work has been carried out to help understand the response property of the direct dine multi-axis robot. In the direct drive robot, non-negligible amount of disturbance and load Induced dynamics variation are transmitted to the drive axis and nonlinearity is highly observed. Thereupon a robust controller Implementing time-delay control law is proposed, and computer simulation confirms the possibility for the time-delay control application against the unpredictable disturbance and load-Induced dynamics variation.

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Development of High Power BLDC Servo System for Control of Large Scale Mechanical System (대형 기계 구조물의 제어를 위한 대용량 BLDC 서보 시스템의 개발)

  • 정세교;김경화;송정민;김대준;김창걸;김원수;윤명중
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.982-986
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    • 1996
  • The development of a high power BLDC servo system for a control of the large scale mechanical system is presented. Using DSP TMS320C30, a control unit which is suitable for motor drive system, is developed. Also, based on the developed control unit, BLDC drive system for the speed control is constructed. The algorithms of the vector control, current control, and speed control is implemented using TMS320C30 Software Development Tool. The developed high power BLDC motor drive system is applied to the large scale mechanical system and its feasibility is verified through the experimental results.

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A study on the Digital Control System for high speed operation of BLDC Motor (BLDC 전동기의 고속운전을 위한 디지털제어기에 관한연구)

  • Cheon, D.J.;Shin, M.S.;Lee, S.H.;Jung, D.Y.;Kim, C.S.;Lee, B.S.;Goak, D.G.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.336-339
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    • 2005
  • This paper presents a PM type BLDC(Brushless DC) Motor servo drive system using high performance DSP TMS320F2812. The DSP controller with 150MIPS enables an enhanced real time implementation and increased efficiency and high performance for motor drive. The suggested drive system consists of PI action for the constant speed control and PID action for the current control with only 3 Halls, no encoders. The developed servo drive control system shows a good response speed characteristics at high speed up to 10000 [rpm].

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