• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.11 no.1
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• pp.81-91
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• 1997

본 논문에서는 시스템 모델링이 어렵과 복잡한 자동화 설비를 위한 간단한 지능제어방식을 제안하나. 제안된 방식은 시스템 모델링이 불확실한 시스템에 대하여 입력신호와 직접관계되지 않은 비선형 함수의 동정은 퍼지-신경회로망을 이용하고, 입력신호와 관계되는 비선형 함수는 동정을 하지 않고 임의의 양의 실수로 놓으므로 기존의 전체함수 동정보다 적은량으로 동정할 수 있고, 동정된 정보를 이용하여 비선형 제어기를 설계하는 간단한 제어방식이다. 제안된 제어 방식의 유용성을 확인하기 위하여 자동화 설비에 액츄에이터로 많이 사용되는 직류 서보전동기를 이용한 역진자 시스템에 적용하여 시뮬레이션 및 실험을 하고, 제안된 제어방식을 기존의 신경회로망 제어방식과 제어성능을 비교 검토한다.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.7
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• pp.127-132
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• 2017

In this paper, we propose a controller gain based on model based design and implement the two-wheel inverted pendulum type robot using NXT Lego and RobotC language. Two-wheel inverted pendulum robot consists of NXT mindstorm, servo DC motor with encoder, gyro sensor, and accelerometer sensor. We measurement wheel angle using bulit-in encoder and calculate wheel angle speed using moving average method. Gyro measures body angular velocity and accelerometer measures body pitch angle. We calculate body angle with complementary filter using gyro and accelerometer sensor. The control gain is a weighted value for wheel angle, wheel angular velocity, body pitch angle, and body pich angular velocity, respectively. We experiment and observe the effect of two-wheel inverted pendulum with respect to change of control gains.

• Journal of the Korean Society for Railway
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• v.15 no.2
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• pp.129-134
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• 2012

In this paper, speed control of IPMSM drives for the next generation domestic high speed railway system using NPC 3-level inverters is presented. The NPC multilevel inverter is suitable for the high-voltage and high-power motor drive system because it has advantages in that the voltage rating of the power semiconductor devices and output current harmonics are reduced. For the speed control of IPMSM using NPC 3-level inverters, maximum torque control is applied in the constant torque region, and filed weakening control is applied in the constant power region. Simulation programs based on MATLAB/Simulink are developed. Finally the designed system is verified and their characteristics are analyzed by the simulation results.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.5
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• pp.54-59
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• 2005

Brushless DC motor is a motor which is modified form DC brush motor and it does not have brushes. BLDCM is easy to centre, has wide speed range, high efficiency. However it needs speed sensor like encoder which increases the motor price and cause some faults in poor surroundings.. In this paper, for the sensorless control, the driving techniques for the initial stable start and the steady state are studied For the steady state the rotor position is determined using the measured back-EMF. To enhance the initial stating performance, the current signal from the free-wheeling diode is used. The results are conformed through the experiments.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.10 no.6
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• pp.81-87
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• 1996

This paper is to develop a digital inverter using microcontroller for a Switched Reluctance Motor (SRM) driver. The closed-loop speed control system with fixed switching angle and variable voltage control is used to from a flat-topped phaes current and to simplfiy the drive system. This could be driven in a wide speed range with flat-topped current. Mifcrocontroller os used to be compact and to have a flexbility in the control system.

• The Transactions of the Korean Institute of Power Electronics
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• v.15 no.1
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• pp.9-16
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• 2010

This paper presents supervisor control methods at a matrix converter controlled overhead crane system based on a controller area network (CAN). Four induction motors are used to drive the gantry, trolley, and hoist at he crane and each motor is controlled by the matrix converter with direct torque control (DTC). Both the position control algorithm and the supervisor control system using CAN are introduced. Simulation and experimental results are carried out to verify the performance of position control at the matrix converter controlled crane system.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.6
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• pp.802-808
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• 2019

DC motors are used extensively on shipboard, including as the ship's winch operating motor, owing to their simple speed control and excellent output torque characteristics. Moreover, they were used as propulsion motors in the early days of electric propulsion ships. However, mechanical rectifiers, such as brushes, used in DC motors have certain disadvantages. Hence, brushless DC (BLDC) motors are increasingly being used instead. While the electrical characteristics of both types of motors are similar, BLDC motors employ electronic rectifying devices, which use semiconductor elements, instead of mechanical rectifying devices. The inverter system for driving conventional BLDC motors uses a two-phase excitation method so that the waveform of the back electromotive force becomes trapezoidal. This causes harmonics and torque ripple in the phase current switching period in which the winding wire through which the current flows is changed. Researchers have studied and presented various methods to reduce the harmonics and torque ripple. This study applies a cascaded H-bridge multilevel inverter, which implements a proportional-integral speed current controller algorithm in the driving circuit of the BLDC motor for electric propulsion ships using a power analysis program. The simulation results of the modeled BLDC motor show that the driving method of the proposed BLDC motor improves the voltage waveform of the input side of the motor and remarkably reduces the harmonics and torque ripple compared with the conventional driving method.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.972-973
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• 2008

본 논문은 3상 2여자 방식의 출력성능을 개선하기 위한 새로운 통전각 확장방식에 관한 연구이다. 제안된 토크제어 방식은 정격토크 이하에서는 기존의 $120^{\circ}$ 통전 PWM 방식으로 토크를 제어하고, 정격토크 이상에서는 출력 증대를 위해 통전각 확장을 통하여 토크를 제어하는 새로운 토크제어 알고리즘을 제안하였다. 또한 PSIM을 이용한 시뮬레이션을 통하여 제안된 방식의 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.184-186
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• 2008

리니어 발전기는 리니어 엔진의 시동에 필요한 연소조건을 만들기 위하여 전동기로 동작하다가 연소가 안정화되면 발전기로 동작을 하여 PCS(Power Conditioning System)를 통해서 전력을 계통으로 보내주게 된다. 리니어 엔진의 초기 시동을 하기 위하여 발전기는 운동주파수와 운동방향, 그리고 힘의 크기를 제어해야 하며, 발전 시에는 엔진의 동작에 맞도록 전력을 제어해야 한다. 이를 효율적으로 제어하기 위하여 MSC(Machine Side Converter)에서 상전류를 독립적으로 조절할 수 있는 H-bridge로 각 상을 구성하였다. LSI(Line Side Inverter)는 DC-Link 전압을 제어하여, MSC의 동력/발전 동작에 따라서 전력을 계통에서 받아오거나 전력을 계통으로 보내는 동작을 한다. 본 연구에서는 리니어 발전기 모델링를 통해서 PCS 제어 알고리즘을 확인하고 전체 시스템과 연동을 한 실제 운전특성에 대하여 살펴보았다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.12 no.4
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• pp.75-80
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• 1998

In this paper, the real time characteristics analyzing system is proposed to analyze characteristics of inverter. The system is consisted of DSP unit and personal computer. Conventionally, power conversion system is designed by the load and the use. And control characteristics for the designed power conversion system is evaluated by the control input. In order to study of control methods, power conversion system is required for a study of control methods and observed system is required for a analyzing of the inverter. Inverter system is consisted to evaluate for proposed real time characteristics analyzing system. And induction motor is driven by control input that is manufactured by personal computer. Output of inverter and control characteristics is variously analyzed.