• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.22 no.6
• /
• pp.21-30
• /
• 2022

This paper describes the design, manufacture, and testing of servos applicable to small tracking radars. First, Chapter 1 describes the necessity of this study. Chapter 2 describes the development of servos applicable to future tracking radars in small missile systems. Chapter 3 describes the design and test results for current control of brushed DC motors, brushless DC motors, and permanent magnet synchronous motors. And Chapter 4 describes the design and test results for speed control of the test wheel. And in Chapter 5, the results of the previous tests are summarized. In this paper, some pictures were intentionally blurred for security reasons, and the control result of test wheel was described, not the test with the developed gimbals.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.5
• /
• pp.467-474
• /
• 2000

This paper describes the development of 7he utility vehicle controller using combination system of battery and photovoltaic power for increasing operation time. In order to keep interchangeability, low cost and high performance, a separately excited DC Motor is controlled without velocity and current measurements by $\mu$-processor. For the parallel operation between the solar cell and battery, dc-dc converter is used, which is applied to the maximum power Point tracking(MPPT) and current control algorithm. By the simulation and experimental results of trial product, the vapidity of the proposed system is verified.

• Journal of the Korean Institute of Telematics and Electronics T
• /
• v.36T no.3
• /
• pp.50-55
• /
• 1999

Brushless DC Motor(BLDCM) has high efficiency. But this type of motor needs a rotor sensor which complicates the motor configuration. Rotor position sensor degrades system reliability in the severe environmental condition. In this paper, we study a controller which permits the determination of the rotor position by the back EMF to eliminate the rotor position sensor Also, since the back EMF is zero at standstill, a starting technique which permits the starting of an asynchronous motor without a sensor is described. The controller is implemented using microcontroller for minimal external component.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.13 no.1
• /
• pp.94-101
• /
• 1999

In this paper the problems associated with the switching surge of PWM inverter devices were analysed. As the application of ASD for efficient speed control of AC rmtors is increased, so is the rrntor and ASD-related failure increased. In the industrial rmtor awlications, the introduction of PWM drives can sometmes cause insulation breakdown between the phase windings due to high transient voltage peak. The motor cable length combined with the high switching frequency becomes more sensitive issue for proper drive operation. Effects of the cable length and high switching frequency influence both on rmtor and inverter. When the insulation level of rmtor winding is low, the failure probability caused by high peak voltage and fast voltage rise times(dv/dt) is high. Voltage refloctions are simulated far rmtor capacities, ASD and rise times and are presented graphically. The filtering techniques are discussed to reduce the rmtor terminal overvoltage and dv/dt in inverter fed AC rrntor drive systems. We confirmed that the lower motar capacity and rmtar insulation level, the shorter switching time and cable length and the higrer the probability of insulation breakdown .kdown .

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.5 no.4
• /
• pp.8-14
• /
• 1991

In this paper, the variable speed control of permanent magnet synchronous motor driven by a sinusoidal PWM inverter based on maximun torque sensitivity is presented. The developed torque or speed control is achieved by the field orientation technique. For the field orientation, the resolver is used as the rotor positioning sensor mounted on the motor shaft without pull-out of the synchonism at any speed. To show the validity of proposed control method, the simulation and experimental results are provided. The advantages of the proposed control method are to achieve the fast current and speed responses.

• 전기의세계
• /
• v.30 no.12
• /
• pp.832-837
• /
• 1981

The study of PLL System to control the Speed of three phase induction motor is described. By solving some problems of conventional PLL system, the system has ability to be easily locked under any conditions. In order to study response velocity and stability of system, this paper presents different filter types and methods of determination of time constant.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2012.04a
• /
• pp.644-645
• /
• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2011.10a
• /
• pp.157-158
• /
• 2011

• Proceedings of the KIEE Conference
• /
• 2007.04c
• /
• pp.177-179
• /
• 2007

본 논문에서는 심플로러를 이용하여 실제와 가장 유사한 DFIG (Doubly-Fed Induction Generator)를 모사하였다. 이를 위해서 실제 바람과 유사한 속도 명령을 룩업 테이블로 만들어 대체하였고 실제 전기기기의 파라미터 값을 입력하였다. 그동안 풍력 발전에 있어서 발전기는 주로 매트랩등둥을 이용해서 DFIG를 구현하였기에 실제와 다소 다르고 모의실험으로 대체하기 매우 어려웠지만 심플로러(Simplorer)를 이용하여 실제와 가장 유사한 모의실험 세트를 구현하였다. 우선 터빈의 역할을 담당하는 전동기는 SVM 벡터제어를 이용하여 속도제어를 실시하였고 발전기는 슬립링을 가지고 있는 권선형 유도전동기를 사용하여 DFIG의 구조를 갖추었다.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.104-106
• /
• 2006

LCD 원판이 세대별로 대형, 중량화됨에 따라 제조 공정라인의 자동 반송장비도 대형화 되어 가고 있는 추세다. 기존 스토커는 주행축에 회전형 모터와 기계적 동력변환 장치를 사용하고 있어, 복잡한 구조와 기계적 마찰에 의한 잦은 유지, 보수가 필요하게 되고 파티클 발생을 최소화 시켜야 하는 문제점을 안고 있다. 따라서 이런 문제점들을 해결하기 위해, 본 논문에서는 횡자속 선형전동기를 적용하고 제안된 제어 알고리즘 및 제어기, 전력변환장치를 제작해서 대형, 고출력, 장거리화 되고 있는 스토커의 주행축에 실험, 검증하였다.