• Title, Summary, Keyword: device drive

Search Result 471, Processing Time 0.053 seconds

A Study on Ultra Precision Rotational Device Using Smooth Impact Drive Mechanism (스무즈 임팩트 구동 메커니즘을 이용한 초정밀 회전장치에 관한 연구)

  • Lee, Sang-Uk;Jeon, Jong-Up
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.25 no.4
    • /
    • pp.140-147
    • /
    • 2008
  • This paper represents an ultra precision rotational device where the smooth impact drive mechanism (SIDM) is utilized as driving mechanism. Linear motions of piezoelectric elements are converted to the rotational motion of disk by frictional forces generated between the rotational disk and the friction part that is attached to the piezoelectric element. This device was designed to drive the rotational disk using slip-slip motion mechanism instead of stick-slip motion mechanism occurred in conventional impact drive mechanism. Experimental results show that the angular velocity is increased in proportion to the magnitude and frequency of supplied voltage to piezoelectric element and decreased as the preload is increased. In our device, the smooth rotational motion was obtained when the driving frequency has been reached to 500Hz under the driving voltage of 100V.

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
    • /
    • v.14 no.3
    • /
    • pp.147-151
    • /
    • 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.

Forensic Investigation of External USB Drive (외장형 USB 저장장치의 포렌식 조사방법)

  • Song, Yu-Jin;Lee, Jae-Yong
    • Journal of the Korea Industrial Information Systems Research
    • /
    • v.15 no.4
    • /
    • pp.39-45
    • /
    • 2010
  • Because of portable storage device's technical improvement, it's speeding up the conversion of mass storage. It means it's easier to move and save data. Generally, USB is using for portable storage device and forensic perspective, it's possible us to study data drain through portable storage device under securement of using vestige of USB. If we can secure using vestige of USB from boot domain it's possible to investigate data drain & prove criminal act. This thesis is suggesting Key/Thumb drive & USB Drive Enclosure's confirmation of using or not and division way though Disk Signature analysis.

Damage Evaluation of CD-RW Drive by Drop Test and Simulation (CD-RW Drive의 낙하충격 손상평가)

  • Woo Jae Chul;Yun Ki Won;Seok Ki Young;Kim Heon Young;Kim Sang Bum
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.29 no.1
    • /
    • pp.81-87
    • /
    • 2005
  • A fracture of hand held device, such as radio, TV and CD-RW drive, mainly occurs due to drop situation. For CD-RW drive, the need of high reading/writing speed in conjunction with low price accelerates the fracture of the device. Computer simulation can reduce the period of development and enhance impact characteristic of device. In this study, the detailed finite element model of CD-RW drive was developed to predict the damage under drop conditions. Material property for shock absorbing damper was obtained from tensile test of raw material. A MOONEY-RIVLIN type rubber in LS-DYNA was used as the material model of damper. To assess the reliability of the developed model, drop test at 200G-2msec and 150G-10msec condition was conducted and acceleration at pick-up was compared.

A Study on the Ultra Precision Rotational Device using Smooth Impact Drive Mechanism (SIDM(Smooth Impact Drive Mechanism)을 이용한 초정밀 회전기구에 대한 연구)

  • Lee S.;Jeon J.U.;Park K.Y.;Boo K.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • /
    • pp.485-486
    • /
    • 2006
  • This paper represents a ultra precision rotational device where the smooth impact drive mechanism(SIDM) is utilized as a driving mechanism. Linear motions of piezoelectric elements are converted to the rotational motion of disk by frictional forces generated between the rotational disk and the friction bars which are attached to the piezoelectric elements. This device was designed to drive a rotational disk using slip-slip motion mechanism based on stick-slip motion mechanism. Experimental results show that the angular velocity was increased in proportion to the magnitude of supplied voltage to piezoelectric element. In our device, the smooth rotational motion was obtained when the driving frequency has been reached to 500Hz under the driving voltage of 100V. The amount of step movement has been revealed to be $3.44{\times}10^{-4}$ radian.

  • PDF

A Study on OLED display device's line defect test methode (OLED display device의 Line Defect 시험법에 관한 연구)

  • Choi, Young-Tae;Choi, Jai-Rip
    • Proceedings of the Safety Management and Science Conference
    • /
    • /
    • pp.523-529
    • /
    • 2009
  • The ACF(Anisotropic Conductive Film) is used for bonding Drive IC and OLED display device panel. If ACF bonding process is problem, a malfunction of line defect can occur. Because electric resistance increase between the panel and drive IC after a period of time, drive IC can not supply enough current to the panel. This paper is studied on a method of test for line defect.

  • PDF

A Thermal Model for Electrothermal Simulation of Power Modules

  • Meng, Jinlei;Wen, Xuhui;Zhong, Yulin;Qiu, Zhijie
    • Journal of international Conference on Electrical Machines and Systems
    • /
    • v.2 no.4
    • /
    • pp.441-446
    • /
    • 2013
  • A thermal model of power modules based on the physical dimension and thermal properties is proposed in this paper. The heat path in the power module is considered as a one-dimensional heat transfer in the model. The method of the parameters extraction for the model is given in the paper. With high speed and accuracy, the thermal model is suit for electrothermal simulation. The proposed model is verified by experimental results.

The Driving Method of Power Switching Device Using Pizoelectric Transformer (전력 Switching 소자를 압전트랜스로 구동하는 방법)

  • Hwang, Min-Kyu;Lee, Sang-Kyun;Lee, Jae-Choon
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.2458-2460
    • /
    • 1998
  • To drive motor or heating machine, it needs the electric power system like the apparatus of inverter. This electric power system obviously comprises power switching devices and drivers to run them. And this system has the topology comprised one/many arm(s), - each arm has high side switching device and low side switching device. Transformer, photocoupler, and HVIC having functions of isolation and level shift which are important thing to drive high side switching device are used as component of drivers in conventional apparatus. Piezoelectric transformers are proposed in this paper, and applied to drive high side swiching device. Through experiments, the possiblities of driving high side switching device are presented and the problems are mooted concurrently. But, we also consider a counterplan for solving the mooted trouble issues.

  • PDF

The Driving Method of Power Switching Device Using Pizoelectric Transformer (전력 Switching 소자를 압전트랜스로 구동하는 방법)

  • Hwang, Min-Kyu;Lee, Sang-Kyun;Lee, Jae-Choon;Choi, Joon-Young
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1324-1326
    • /
    • 1998
  • To drive motor or heating machine, it needs the electric power system like the apparatus of inverter. This electric power system obviously comprises power switching devices and drivers to run them. And this system has the topology comprised one/many arm(s), - each arm has high side switching device and low side switching device. Transformer, photocoupler, and HVIC having functions of isolation and level shift which are important thing to drive high side switching device are used as component of drivers in conventional apparatus. Piezoelectric transformers are proposed in this paper, and applied to drive high side swiching device. Through experiments, the possiblities of driving high side switching device are presented and the problems are mooted concurrently. But, we also consider a counterplan for solving the mooted trouble issues.

  • PDF

A Study on the Digital Unit Development for Turbine Load Set Control (Turbine Load Set 조정을 위한 Digital Unit 개발)

  • Moon Yong-Seon;Jeong Ho-Jin;Kang Sung-Ryul;Choi Hyeong-Yoon
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.9 no.3
    • /
    • pp.498-503
    • /
    • 2005
  • As important device that decide output load in superannuated thermoelectric power plant which do Turbine Load Set Motor device. This generation of electric power system operated Set Up Range Motor according to Set Up value that operator manufactures by hand circumvolve, and generation of electric power output load derision is consisted by internal action including Motor Therefore, in this research passively output load operated Turbine Motor Drive equipment that can have existing Turbine Load Set Motor Performance developing Digital Drive Unit device design. Also control algorithm implementation and existing Turbine Load Set Motor Drive and connection possibility through designed controlling system to connect basis function that decide development output load with Digital Drive Unit that designed also with existing Motor Drive Unit and can be operated.