• 제목/요약/키워드: device drive

검색결과 528건 처리시간 0.023초

드라이브 내장형 소형 BLDC 모터의 설계와 구현 (Design and Implementation of integrated drive circuit for a small BLDG Motor)

  • 최준혁;이종배;류세현;정중기;성하경
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.170-172
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    • 2003
  • Among low power servo applications, classical DC motors are very popular because they are reasonably cheap and easy to control. The main disadvantage is the mechanical collector which has only a limited life period. Also, brush sparking can destroy the rotor coil, generate EMC problems. So permanent magnet brushless do motors and drives are being used increasingly in a wide range of applications. This has been made possible with the advantages of high performance permanent magnets with high coercively and residual magnetic, which make it possible for the PM to have superior power density, torque to inertia ratio and efficiency, when compared to an induction or conventional dc machine. This paper presents the design of a PM brushless dc motor drive simplistically operates as a classical dc motor. The BLDC motor drive system for this paper composes to the power integrated circuits, the one chip device. And several simple semiconductors add to drive system for a motor drive system simplistically operates as a conventional dc motor. Test results confirmed the feasibility of the proposed motor drive system design.

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SRM의 병렬권선 운전 특성 (Characteristics of Parallel Winding Drive of SRM)

  • 황형진;박성준;안진우
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.66-68
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    • 2003
  • In a motor drive, the current rating is directly related to the rating of a switching device, and the parallel switching operation for a cost reduction is the alternatives because it has the smaller current rating through current division. There are many investigations for the parallel switching operations to equaling the current division. However it remains many problems for practical usage. This paper proposes a new parallel operation which uses a parallel phase winding to remove the traditional effect of switching device such as saturation voltage according to the division of current. The proposed strategy is verified by theoretical and experimental verification.

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새로운 스위칭 패턴을 사용한 SRM의 병렬권선 운전 (Paralling of SRM Drive System using Novel Switching Pattern)

  • 김태형;이동희;안진우
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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    • pp.918-921
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    • 2004
  • In a motor drive, the current rating is directly related to the rating of a switching device, and the parallel switching operation for a cost reduction is the alternatives because it has the smaller current rating through current division. There are many investigations for the parallel switching operations to equaling the current division. However it remains many problems for practical usage. This paper proposes a new parallel operation which uses a parallel phase winding to remove the traditional effect of switching device such as saturation voltage according to the division of current. The proposed strategy is verified by theoretical and experimental results.

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상용주파수(60Hz)에서의 후막 전계광소자의 발광 특성에 관한 연구 (A Study on Emission Property of Powder Electroluminescent Device at Common use Frequency(60Hz))

  • 오주열;박영순;정병선;이종찬;박대희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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    • pp.779-782
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    • 1998
  • Electroluminescence is occurred by electric filed located in the phosphor. Until now most of EL researched have been studied the characteristics of devices that drive over 400Hz and commercialized, but in Problems of life time, natural aging increased with behavior of high frequency in the phosphor. In this paper, we investigated the luminescence characteristics were driven by low frequency($0{\sim}100Hz$). Moreover, we Presented the improvement way in the method device production and drive power as measurement at commercial frequency(60Hz).

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초음파 모터의 위상차 제어를 이용한 3자유도 힘반영 촉각장치 설계 (Design of A Force-Reflecting 3DOF Interface using Phase-Difference Control of Ultrasonic Motors)

  • 오금곤;조진섭;김동옥;김영동;김재민
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1999년도 전력전자학술대회 논문집
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    • pp.84-87
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    • 1999
  • This paper proposes an interfaces control system to drive a ultrasonic motors(USMs). To touch surfaces and objects created within a virtua environment, the 3 DOF force-reflecting interfaces provides force feedback to users, so to feel touching real things. To effectively display the mechanical impedance of the human hand we need a device with specific characteristics, such as low inertia almost zero friction and very high stiffness. As an actuator for direct drive method, the USMs have many good advantages satisfied these conditions over conventional servo motors. To estimate capability of this interface, we did an experiment. The device works very well, as user are able to detect the edge of the wall and the stiffness of the button.

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The effects of short persistent CCFL in Blinking Back Light Unit to reduce blur on TFT-LCD

  • Han, J.M.;Bae, K.W.;Kim, S.Y.;Kim, Y.H.;Lim, Y.J.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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    • pp.694-697
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    • 2003
  • In applying LCD to TV application, one of the most significant factors to be improved is image sticking on the moving picture. LCD is different from CRT in the sense that it's continuous passive device, which holds images in entire frame period, while impulse type device generate image in very short time. To reduce image sticking problem related to hold type display mode, we made an experiment to drive LCD like CRT. We made articulate images by turn on-off backlight, and we realized the ratio of Back Light on-off time by adjusting between on time and off time for video signal input during 1 frame (16.7ms). Conventional CCFL (cold cathode fluorescent lamp) cannot follow fast on-off speed, so we evaluated new fluorescent substances of light source to improve residual light characteristic of CCFL. We realized articulate image generation similar to CRT by blinking drive. As a result, reduced image sticking phenomenon was validated by naked eye and response time measurement.

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Comparative Study on the Optimization Methods for a Motor Drive of Artificial Hearts

  • Pohlmann, Andre;LeBmann, Marc;Hameyer, Kay
    • Journal of Electrical Engineering and Technology
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    • 제7권2호
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    • pp.193-199
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    • 2012
  • Worldwide cardiovascular diseases are the major cause of death. Aside from heart transplants, which are limited due to the availability of human donor hearts, artificial hearts are the only therapy available for terminal heart diseases. For various reasons, a total implantable artificial heart is desirable. But the limited space in the human thorax sets rigorous restrictions on the weight and dimensions of the device. Nevertheless, the appropriate functionality of the artificial heart must be ensured and blood damage must be prevented. These requirements set further restrictions to the drive of this device. In the this paper, two optimization methods, namely, the manual parameter variation and Differential Evolution algorithm, are presented and applied to match the specifications of an artificial heart.

전력용 IGBT의 시뮬레이션과 과도 해석 (Simulation of Power IGBT and Transient Analysis)

  • 서영수
    • 한국시뮬레이션학회논문지
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    • 제4권2호
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    • pp.41-60
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    • 1995
  • The IGBT(Insulated Gate Bipolar Transistor) is a power semiconductor device that has gained acceptance among circuit design engineers for motor drive and power converter applications. IGBT devices(International Rectifier, Proposed proposed model etc) have the best features of both power MOSFETs and power bipolar transistors, i.e., efficient voltage gate drive requirememts and high current density capability. When designing circuit and systems that utilize IGBTs or other power semiconductor devices, circuit simulations are needed to examine how the devices affect the behavior of the circuit. The interaction of the IGBT with the load circuit can be described using the device model and the state equation of the load circuit. The voltage rise rate at turn-off for inductive loads varies significantly for IGBTs with different base life times, and this rate of rise is important in determing the voltage overshoot for a given series resistor-inductor load circuit. Excessive voltage overshoot is potentially destructive, so a snubber protection circuit may be required. The protection circuit requirements are unique for the IGBT and can be examined using the model. The IGBT model in this paper is verified by comparing the results of the model with experimented results for various circuit operating conditions. The model performs well and describes experimented results accurately for the range of static and dynamic condition in which the device is intended to be operated.

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600 V급 IGBT Single N+ Emitter Trench Gate 구조에 따른 전기적 특성 (Study on the Electrical Characteristics of 600 V Trench Gate IGBT with Single N+ Emitter)

  • 신명철;육진경;강이구
    • 한국전기전자재료학회논문지
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    • 제32권5호
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    • pp.366-370
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    • 2019
  • In this paper, a single N+ emitter trench gate-type insulated gate bipolar transistor (IGBT) device was studied using T-CAD, in order to achieve a low on-state voltage drop (Vce-sat) and high breakdown voltage, which would reduce power loss and device reliability. Using the simulation, the threshold voltage, breakdown voltage, and on-state voltage drop were studied as a function of the temperature, the length of time in the diffusion process (drive-in) after implant, and the trench gate depth. During the drive-in process, a $20^{\circ}C$ change in temperature from 1,000 to $1,160^{\circ}C$ over a 150 minute time frame resulted in a 1 to 4 V change in the threshold voltage and a 24 to 2.6 V change in the on-state voltage drop. As a result, a 0.5 um change in the trench depth of 3.5 to 7.5 um resulted in the breakdown voltage decreasing from 802 to 692 V.

로드셀과 토크암을 이용한 대용량 토크 측정장치 개발에 관한 연구 (Development of device measuring very high torque via torque arm with attached load cells)

  • 이용범;한승호
    • 유공압시스템학회논문집
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    • 제7권1호
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    • pp.6-10
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    • 2010
  • A measurement of very high torque for track drive unit in construction equipment is usually in difficulties due to the requirement of a torque meter with high capacity, and the limitation of geometry for an experimental set-up. To improve the troublesome problem, a new device was proposed, where a torque transmitted through the torque arm can be measured by load cells attached at each torque arm. The experimental set-up of the new device was carried out in order to measure the torque values for a mechanical feedback type planetary gear box, in which the power flow circulates itself in a closed-loop. The new device enables to measure torque values of 60,000Nm. Additionally, the measured values were estimated statistically in the aspect of their repeatability and reproducibility, so that an acceptable behaviour as a measuring device can be confirmed.

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