• Title/Summary/Keyword: drive

Search Result 8,025, Processing Time 0.036 seconds

ARM Multimedia data retrieval in low power mobile disk drive (저전력 모바일 드라이브에서의 멀티미디어 데이터 재생)

  • Park, Jung-Wan;Won, You-Jip
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2002.04a
    • /
    • pp.676-678
    • /
    • 2002
  • In this work, we present the novel scheduling algorithm of the multimedia data retrieval for the mobile disk drive. Our algorithm is focused on minimizing the power consumption involved in data retrieval from the local disk drive. The prime commodity in mobile devices is the electricity. Strict restriction on power consumption requirement of the mobile device put unique demand in designing of its hardware and software components. State of the art disk based storage subsystem becomes small enough to be embedded in handhold devices. It delivers abundant storage capacity and portability. However, it is never be trivial to integrate small hard disk or optical disk drive in handhold devices due to its excessive power consumption. Our algorithm ARM in this article generates the optimal schedule of retrieving data blocks from the mobile disk drive while guaranteeing continuous playback of multimedia data.

  • PDF

DSP based SRM Drive System for EPS Application (DSP 기반의 EPS용 SRM 구동 시스템 개발)

  • Kim, Bong-Chul;Ahn, Young-Ju;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
    • /
    • 2003.04a
    • /
    • pp.13-15
    • /
    • 2003
  • This paper presents a design and characteristics analysis of a SRM drive for EPS application. A rack mounted EFS system is considered in this paper. A conventional driving room space and mechanical structure are suggested in design stage. In the restricted design conditions, motor parameters are determined for sufficient torque and speed. For the smooth torque generation and simple circuit of power system, 12/8 motor drive is considered. With FEM and magnetic circuit analysis designed motor is simulated to meet the requirement of specifications. Effectiveness of the suggested SRM drive for EPS application is verified by the manufactured prototype motor drive tests.

  • PDF

A Gate Drive IC for Power Modules with Shoot-through Immunity (상단락 방지용 모듈을 구동하기 위한 게이트 구동 IC)

  • Seo, Dae-Won;Kim, Jun-Sik;Park, Shi-Hong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.22 no.7
    • /
    • pp.580-583
    • /
    • 2009
  • This paper introduces a gate drive IC for power modules with shoot-through immunity. A new approach uses a bootstrap diode as a high-side voltage bias and a level shift function at the same time. Therefore, the gate drive circuit becomes a simple and low-cost without conventional level shift functions such as HVIC(High-Voltage IC), optocoupler and transformer. The proposed gate drive IC is designed and fabricated using the Dongbu-Hitek's 0.35um BD350BA process. It has been tested and verified with IGBT modules.

A High Voltage LED Drive IC using Voltage Clamp Bias (Voltage Clamp Bias를 사용한 고전압 LED Drive IC)

  • Kim, Seong-Nam;Park, Shi-Hong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.22 no.7
    • /
    • pp.559-562
    • /
    • 2009
  • Due to the enormous progress achieved in light emitting diodes (LEDs) LEDs have been become a good solution for lightings. In LED driver for lighting applications, it is required high input voltage to drive more LEDs. Therefore, high-voltage should be changed to low-voltage to supply power for drive IC. In this paper, LED drive IC using voltage clamp bias circuit, it use a hysteretic-buck converter topology was proposed and verified through experiments.

The Integration Drive Equipment for Hoistby using Voltage Control Circuit (전압제어 회로에 의한 호이스트용 통합 드라이브 장치)

  • 라병훈;송대현;서기영;고희석;이현우
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2002.11a
    • /
    • pp.281-286
    • /
    • 2002
  • An existent hoist drive system is using each different drive equipment in control of Hoisting, traveling(T/L), traversing(T/S) driving, so there are much energy losses because of excessive weight. Also, power circuits are using relay contact, so working environment are frequent secession accident etc.. by shock on unfavorable condition, and there is danger of safety accident, maintenance has frequent problem and so on. To solve these problem, it is integrated each driving power supply in drive system for hoist control and drive, utility power supply etc.. by single device in this research. The power circuit is consisted of non-contact circuit applying to bidirectional voltage controller circuit using thyristor that is power semiconductor switching device

  • PDF

Speed Control of Induction Motor Drive for FCU Using TMS320LF2406 DSP controller (TMS320LF2406 DSP를 이용한 FCU용 유도 전동기 속도제어)

  • Choi Woo-Suk;Kim Lee-Hun;Park Kyu-Hyun;Won Chung-Yuen;Lee Sang-Suk;Choi Chang-Young
    • Proceedings of the KIPE Conference
    • /
    • 2001.12a
    • /
    • pp.3-6
    • /
    • 2001
  • This paper designs a drive for high efficiency of the 3-phase IM (induction motor) for FCU(Fan Coil Unit). The speed control system of 3-phase IM for FCU has been implemented by a TMS320LF2406 DSP chip. The DSP TMS320LF2406, which include the most peripheral circuit for control of the Industrial motor suitable for AC motor drive. This type of the controller can be obtained low cost and high reliance. The proposed drive system of the 3-phase IM for the FCU is verified by simulation. The results show the speed control characteristics of the control strategy Proposed for 3-Phase IM drive.

  • PDF

High Power Factor Low Torque Ripple Drive Scheme of Single-Phase SRM based on Mathematical Model (수학적 모델을 기반으로 한 단상 SRM의 고역률 저토크리플 구동방식)

  • Liang, Jianing;Kim, Tae-Hyoung;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
    • /
    • 2007.04c
    • /
    • pp.103-106
    • /
    • 2007
  • This paper presents single-phase SRM drive system with single-stage high power factor and low torque ripple. Single-phase SRM has simple mechanical and electrical structure, robust and high speed operation characteristic. But conventional SRM drive with diode bridge rectifier and filter capacitor has a low power factor because of short charge time of capacitor. Therefore, this paper presents a novel single-phase SRM drive with single-stage structure circuit, which can improve the power factor and reduce peak torque ripple. A novel switching topology is presented base on mathematical analysis. The novel drive method is verified by simulations and experiments.

  • PDF

Force control of the direct-drive robot using learning controller (학습제어기를 이용한 직접구동형 로봇의 힘제어)

  • Hwang, Yeong-Yeun
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.21 no.11
    • /
    • pp.1819-1826
    • /
    • 1997
  • Direct-drive robots are suitable to the position and force control with high accuracy, but it is difficult to design a controller because of the system's nonlinearity and link-interactions. This paper is concerned with the study of the force control of direct-drive robots. The proposed algorithm consists of feedback controllers and a neural network. After the completion of learning, the output of feedback controller is nearly equal to zero, and the neural network controller plays an important role in the control system. Therefore, the optimum retuning of parameters of feedback controllers is unnecessary. In other words, the proposed algorithm does not require any knowledge of the controlled system in advance. The effectiveness of the proposed algorithm is demonstrated by the experiment on the force control of the parallelogram link-type direct-drive robot.

The Technical Trend and Future Development Direction of Machine Tools Feed Drive System by Patent Mapping (특허분석을 통한 공작기계 이송계의 기술 현황과 발전방향)

  • Eun, In-Ung;Chee, Hyun-Su;Lee, Ji-Won
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.29 no.5
    • /
    • pp.510-515
    • /
    • 2012
  • Feed drive systems are used to position the machine tool components carrying the cutting tool and workpiece to the desired location. Hence, their positioning accuracy and speed determine the quality and productivity of machine tools. In this paper, technical trend of machine tools feed drive systems are analyzed by patent mapping. And this paper suggested future development direction of feed drive systems. The analysis is carried out by using problem solution map (PSM) for the applied patent during January 2000 and December 2009 in Korea, Japan, EU and U.S.A.

Dynamic Analysis Program for Disk Drive Spindle Systems (디스크 드라이브 스핀들 계의 동특성 해석 프로그램)

  • 오동호;김철순;박노열;노광춘
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1998.04a
    • /
    • pp.211-217
    • /
    • 1998
  • A disk rotor dynamic analysis program called by DR. DAP is developed for disk drive spindle systems to analyze dynamic characteristics in operation and to estimate the effects of excitation sources. It is applicable to design for stabilization and to select parts of disk drive spindle systems. The disk drive spindle system in this program is modeled as a flexible shaft with multiple flexible disks, which is supported by bearings and driven by electric motor, and its complicated coupled vibration characteristics are analyzed by using a substructure synthesis technique with the assumed-modes method. All the coupled modes of interest can be well predicted by the example of a three disk hard disk drive with the three tuning parameters. It is also shown that, with the introduction of the excitation sources associated with the defects of ball bearing systems, the magnetic unbalance of spindle motor, the program can well predict the stability of the system, i.e., the possibility of resonance.

  • PDF