• Title/Summary/Keyword: DC-motor

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PID Control Structure for Model Following Control (모델 추종 제어를 위한 PID 제어기법)

  • 이창호;김종진;하홍곤
    • Journal of the Institute of Convergence Signal Processing
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    • v.5 no.2
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    • pp.138-142
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    • 2004
  • This paper proposes the design of the model following control system using the PID control structure. PID control system became model following control by inserting new pre-compensator in order to improve control performance in discrete-time region. Gain of the PID controller needs to be readjusted when response of system changes due to disturbance or load fluctuation. Performance of control system improves by joining neural network to PID control system because performance of control system depends largely on each PID gain in PID control system. And the games of the PID controller in the proposed control system are automatically adjusted by back-propagation algorithm of the neural network. Angular position of DC servo motor is selected as a plant in order to verify control performance in model following control. After it is applied to the position control system, it's performance is verified through computer experiment.

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Functional Assessment of Vestibular System and Dizziness Diagnosis (전정기능 평가 및 질병 진단을 위한 정현파 회전자극기 개발)

  • Jeong, Ho-Chun;Lim, Seung-Kwan;Kim, Kuy-Kem;Chin, Dal-Bok
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.1027-1030
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    • 1996
  • The purpose of this study was to develop systematic diagnostic system testing easily, rapidly vestibular function of patients suffered from vestibular syndrome such as nausea vomiting, dizzness, ataxia. Diagnostic system composed of rotatory chair system which rotated sinusoidally patients against their vertical axis for purpose of invoking eye movement by vestibulo-ocular reflex and the softwares which storaged eye movement into computer and analyzed eye movement. Rotatory chair system consisted of comfortable chair and DC servomotor with reducer(1:80) by controlled servo in field of nonlinear motor control, double feedback loops system containing velocity feedback loop and position feedback loop was applied to this sever controlled rotatory chair system. Maximum rotatory velocity of rotatory chair was upto 60 degree per second and frequency range was 0.01 to 0.64 Hz. These above results suggest that clinical rotatory chair system may test easily, rapidly vestibular function and diagnose etiology of dizziness, thus giving effective assistance on the treatment of dizziness patients.

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Compensating for the Neutral-Point Potential Variation in Three-Level Space-Vector PWM Method (3-레벨 인버터 공간벡터 변조시의 중성점 전위 변동 보상법)

  • Seo Jae Hyeong;Kim Kwang Seob;Bang Sang Seok;Choi Chang Ho
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.475-478
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    • 2001
  • In performing the three-level SVPWM, it is nearly impossible to control the neutral-point potential exactly to the half of the dc-link voltage at all times. Therefore the inverter would produce an erroneous output voltage by this voltage unbalance. So the voltage unbalance has to be compensated in doing PWM, when the voltage unbalance occurs whether it is small or large, to make the inverter output voltage follow the reference voltage exactly the same. In this paper, a new compensating method for the neutral-point potential variation in a three-level inverter space vector PWM (SVPWM) is presented. By using the proposed method, the output voltage of the inverter can be made same as the reference voltage and thus the current and torque ripple of the inverter driven motor can be greatly improved even if the voltage unbalance is quite large. The proposed method is verified experimentally with a 3-level IGBT inverter.

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Development of Auto- Equipment System for Single Crystalline growth (단결정 성장을 위한 자동화 설비 시스템 개발)

  • 조현섭
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.3
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    • pp.15-19
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    • 2002
  • It is a quite quality concerming to the temperature of single cystalline growth as it does when we get most of heat treating products. It is also important factor to control the temperature when we make the A1203(single crystalline) used to artificial jewels, glass af watches, and heat resistant transparent glasses. Thus, it is a major interest to get the proper temperature in accordance with the time process while we are making mixture of oxygen and hydrogen to have the right tempearture. In this paper, we will study of electrical valve positioning system with DC-Motor for the gas mixture to improve the quality of products.

Real-time Distributed Control in Virtual Device Network with Uncertain Time Delay for Predictive Maintenance (PM) (가상 디바이스 네트워크상에서 불확실한 시간지연을 갖는 실시간 분산제어를 이용한 예지보전에 관한 연구)

  • Kiwon Song;Gi-Heung Choi
    • Journal of the Korean Society of Safety
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    • v.18 no.3
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    • pp.154-160
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    • 2003
  • Uncertain time delay happens when the process reads the sensor data and sends the control input to the plant located at a remote site in distributed control system. As in the case of data network using TCP/IP, VDN that integrates both device network and data network has uncertain time delay. Uncertain time delay can cause degradation in performance and stability of distributed control system based on VDN. This paper first investigates the transmission characteristic of VDN and suggests a control scheme based on the Smith's predictor to minimize the effect of uncertain varying time delay. The validity of the proposed control scheme is demonstrated with real-time velocity control of DC servo motor located in remote site.

Maximum Torque Control of IPMSM Drive with Field Weakening Control (약계자 제어에 의한 IPMSM 드라이브의 최대토크 제어)

  • Chung, Dong-Hwa;Kim, Jong-Gwan;Park, Gi-Tae;Cha, Young-Doo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.8
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    • pp.85-93
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    • 2005
  • Interior permanent magnet synchronous motor(IPMSM) has become a popular choice in electric vehicle applications, due to their excellent power to weight ratio. The paper is posed maximum torque control of IPMSM for high speed drive. The control method is applicable over the entire speed range and considered the limits of the inverter's current and voltage rated value. For each control mode, a condition that determines the optimal d-axis current $i_d$ for maximum torque operation is derived. The proposed control algorithm is applied to IPMSM drive system for high speed drive, the operating characteristics controlled by maximum torque control are examined in detail by experiment.

Performance of Multi-level Inverter for High-Speed SR Drive (SRM의 고속운전을 위한 새로운 멀티레벨 인버터의 구동특성)

  • Lee, Dong-Hee;Ahn, Jin-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.3
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    • pp.234-240
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    • 2007
  • In this paper, a novel multi-level inverter for low cost high speed switched reluctance(SR) drive is proposed. The proposed multi-level converter has reduced number of power switches and diodes than that of a conventional asymmetric converter for SRM and smaller voltage rating of the dump capacitor comparing with energy efficient c-dump converter. It can supply five operating modes that is boosted, DC-link, zero, negative bias and negative boosted voltage. The proposed multi-level converter has fast excitation and demagnetization modes of phase current, so dynamic response can be achieved. The proposed multi-level converter is verified by computer simulation and experimental results.

A Study on Revolving Characteristics According to Stator Shape in 5MW Class Brushless DC Motor for Ship Propulsion (선박용 5MW급 BLDC 추진전동기의 고정자 형상에 따른 회전특성에 관한 연구)

  • Kim, Dong-Sok;Sung, Il-Kwon;Kim, Jang-Mok;Park, Gwan-Soo;Kim, Han-Deul;Shin, Pan-Seok
    • Proceedings of the KIEE Conference
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    • 2005.10c
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    • pp.47-49
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    • 2005
  • 최근의 선박 추진시스템은 기존의 엔진, 터빈 둥의 구동 원에서 선박의 발전기로부터 선체 외부의 프로펠러와 일체형으로 구성된 모터를 구동하여 추진하는 전기추진식으로 변화되고 있다. 특히, 히토류계 영구자석재질의 발달로 인하여 대형선박의 추진을 위한 대용량 자석계자형 BLDC와 영구자석형 동기전동기의 설계 연구가 활발히 이루어지고 있다. 그러나 여전히 MW급 대용량 BLDC 추진전동기의 설계 연구는 미흡한 실정이다. 이에 본 연구에서는 5MW급 대용량 BLDC 추진전동기 설계 연구를 진행하였으며, 그 결과 슬롯 수에 의한 고정자 형상이 다른 3가지 타입의 인버터 내장형 MW급 모델을 설계하였다. 그리고 이들 모델들을 정자계 유한요소법을 이용하여 해석함으로써 고정자 형상에 따른 회전특성을 분석하였고, 이를 바탕으로 본 설계 조건에 적합한 고정자 형상 설계 방향을 제시하였다.

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A Study on Design of High Power Brushless DC Propulsion Motor with Insert Inverter type in Rotor (인버터 내장형 대용량 BLDC 추진 전동기의 설계에 관한 연구)

  • Sung, Il-Kwon;Kim, Dong-Sok;Park, Gwan-Soo
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1077-1079
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    • 2005
  • 최근 산업기기의 대형화로 인하여 전기기기 및 전력기기의 고효율 대용량 설계에 대한 관심이 커지고 있다. 그 동안에는 대용량 전동기로 주로 유도전동기와 릴럭턴스 전동기가 사용되어 왔다. 그러나 유도전동기는 저속에서의 효율이 낮으며 회전자의 열손실이 효율과 역률을 저하시키는 단점이 있고, 릴럭턴스 전동기는 구조 및 동작원리 상 큰 맥동토크로 인하여 소음과 진동이 매우 크다. 이에 효율과 역률이 좋고 고속운전이 가능한 영구자석형 전동기에 대한 연구가 많이 진행되었고 최근에는 영구자석 재질(희토류계)의 발달함로 인하여 고속 대용량 자석계자형 BLDC와 영구자석형 동기전동기의 설계가 가능해져 대형기에 많이 이용되고 있다. 그러나 대용량 전기기기의 경우 그 크기와 부피가 매우 크고 대전류 대전압의 전원을 공급하여야 하기 때문에 인버터부를 병렬 연결하여야 하므로 제어부를 포함한 전동기의 설치 공간이 증가해 지는 단점이 있다. 이에 본 연구에서는 인버터를 전동기의 회전자 내부에 배치한 인버터 내부형 5[MW]급 BLDC 전동기를 설계하고자 하였다.

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A Study on Load Simulator for Traction system combined testing (전동차 조합시험을 위한 부하 시뮬레이터에 관한 연구)

  • Kim, Gil-Dong;Lee, Han-Min;Oh, Seh-Chan;Pak, Sung-Hyuk;Kim, Jong-Dae
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1643-1645
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    • 2005
  • A newly-built inverter has to undergo a series of stress tests in the final stage of production line. This can be achieved by connecting it to a dynamometer consisting of a three-phase machine joined by a rigid shaft to a DC load machine. The latter is controlled to create some specific load characteristic needed for the test. In this paper a test method is proposed, in which no mechanical equipment is needed. The suggested test stand consists only of a inverter to be tested and a simulator converter. Both devices are connected back- to-back on the AC-side via smoothing reactors. The simulator operates in real-time as an equivalent load circuit, so that the device under test will only notice the behaviour of a three-phase machine under consideration of the load. In odor to wove rightness of the suggested test method, the simulation and actural experiment rallied out emulation for a 2.2kW induction motor.

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