• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.3
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• pp.20-25
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• 1997

SRM은 많은 장점으로 인해 각종 산업분야에 적용을 검토하고 있다. 그러나 토오크리플과 소음이 교류전동기보다 상대적으로 높은 단점이 있다. SRM은 상전류파형이 동작특성과 토오크리플발생에 큰 영향을 미친다. 본 논문에서는 토오크리플을 줄이고 정밀한 속도제어를 위해 순시도통각제어와 PLK제어시스템을 이용하였다. PLL의 위상검출기는 도통각제어에, 루우프필터의 출력은 순시 인가전압의 제어에 각각 도입하여 속응성을 높이고 토오크리플을 줄일 수 있도록 하였다. 실험을 통하여 정밀한 속도제어와 토오크리플 저감특성을 확인할 수 있었다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1731-1732
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• 2005

본 논문은 풍력발전기 안정된 출력발전을 위하여 풍력 동기발전기 여자기 설계에 중점을 두었다. 풍력발전기 최대 발전을 얻기 위해 동기발전기 속도제어와 여자제어가 필요하다. 속도제어에서 AC/DC 정류기는 전력 다이오드로 구성하고 DC/AC 인버터는 IGBT로 구성하였다. 여자제어 구성은 AC/DC는 전력 다이오드로 구성하고 DC단은 DC/DC 부스트로 구성하였다. 또한, 동기발전기 여자 제어기 제어신호에 동기발전기 출력 AC/DC의 전력과 동기발전기 속도로 적절하게 조절함으로서 안정되고 최대 출력이 되도록 하였다. 또한, 제안된 제어기가 우수한 성능을 보임을 시뮬레이션으로 증명하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.37 no.6
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• pp.653-658
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• 2013

This paper describes a new sensorless speed control method for permanent magnet synchronous motor(PMSM) using direct torque control(DTC). The direct torque control offers fast torque response, lesser hardware and processing costs as compared to vector controlled drives. In this paper the current error compensation technique is applied for sensorless speed control of synchronous motor. Through this method, the controlled stator voltage is applied to the synchronous motor so that the error between stator currents of the mathematical model and the actual motor can be forced to decay to zero as time proceeds and therefore, the motor speed approaches to the setting value. Especially, any PI controllers are not necessary in this control method. The simulation results indicate good speed and load responses from the low speed range to the high.

• Journal of IKEEE
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• v.23 no.2
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• pp.543-551
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• 2019

Permanent Magnet Synchronous Motors(PMSMs) have a wider range of applications due to their high output density and high efficiency. PMSMs are used not only in high-power density, high-performance motor-driven systems such as vehicle and robots, but also in systems where cost-cutting is very important, such as washing machines, air conditioners and refrigerators. To reduce costs, position sensorless control is required, which is generally difficult to be used under conditions of starting the motor. Thus, the I-F speed control that rotates the current vector at any speed in the starting procedure should be used at first, and then the sensorless speed control could be applied after PMSM rotates above a certain speed. Speed control performance in I-F speed control and sensorless speed control is very important. And more speed control performance should be maintained even in the transient in which the two control techniques are changed. In this paper, the speed controller transition method from I-F speed control to sensorless speed control of permanent magnet synchronous motor is proposed. Experiments were carried out on the washing machine drive system to verify the performance of the proposed technique.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.5
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• pp.465-471
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• 2002

This paper presents a novel PID speed controller for industry servo applications. Considering the speed loop delay, it allows an automatic controller bandwidth/gain setup with the bandwidth of current controller. In addition, the proposed design nile gives uniformly satisfactory performance and the motor speed stays on a desired response curve with minimal oscillation and settling time. This approach can be applied in conjunction with the cascaded position controller which is widely used in practice.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.395-396
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• 2017

차세대 고속 이동수단에 필요한 고전력 전동기에 대한 관심이 꾸준히 증가하는 추세이다. 본 논문에서는 고전력 동기전동기(PMSM) 구동에 필요한 전력 인버터의 제어 및 센서리스 제어기법을 적용한 자속 기준 제어(Field-oriented control)를 시뮬레이션을 통해 입증하였다. 고전력에서 인버터 스위치의 전력부담을 줄이기 위해 3-레벨 인버터를 설계하고, 벡터 제어 SVPWM 방식을 적용하였으며 고전력 및 고속 PMSM의 파라미터에 맞추어 센서리스(sensorless) 제어기를 설계하였다. 센서리스 제어에는 모델 기준 적응 시스템(MRAS)을 통해 속도 및 위치를 예측하여 모터를 제어하는 방식을 적용하였다. 가속시 5초간 가가속도 값을 적용하여 필요 토크 및 속도제어를 Matlab/Simulink에서 설계 및 구현하고, 예측속도와 실제 모터속도는 최대 0.01 rad의 오차를 나타났고, 67초 동안 목표 속도 500 rad/s까지 가속함을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.39 no.2
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• pp.157-165
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• 2002

This paper presents the implementation of the speed control system for 3 phase induction motor using PD controller and neural networks. The PD controller is used to control the motor and to train neural networks at the first time. And neural networks are widely used as controllers because of a nonlinear mapping capability, we used feedforward neural networks(FNN) in order to simply design the speed control system of the 3 phase induction motor. Neural networks are tuned online using the speed reference, actual speed measured from an encoder and control input current to motor. PD controller and neural networks are applied to the speed control system for 3 phase induction motor, are compared with PI controller through computer simulation and experiment respectively. The results are illustrated that the output of the PD controller is decreased and feedforward neural networks act main controller, and the proposed hybrid controllers show better performance than the PI controller in abrupt load variation and the precise control is possible because the steady state error can be minimized by training neural networks.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2658-2660
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• 2000

본 논문은 주파수역에서의 모델매칭을 이용하여 강인한 성능의 PID 제어기 튜닝법을 제안하였다. 이를 이용하여 부하토크 외란에도 강인한 성능의 BLDC 모터의 속도제어기를 설계하였다. 부하토크 외란이 존재하여도 주어진 기준명령을 강인하게 추종하도록 $H_{\infty}$ 제어를 이용하여 속도제어기를 설계한 후, 설계할 PID 제어계의 루프 전달함수와 설계된 $H_{\infty}$ 제어계의 루프 전달함수간의 오차가 주파수역에서 최소가 되도록 PID 제어기 파라미터를 튜닝하였다. BLDC 모터의 속도제어 시뮬레이션을 통하여 설계된 강인 PID 제어기의 성능을 평가하였다.

• Journal of the Korean Society for Railway
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• v.13 no.2
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• pp.166-172
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• 2010

Currently, vector control is used for speed control of trains because induction motor has high performance is installed in Electric railroad systems. Also, control of the induction motor is possible through various methods by developing inverters and control theory. Presently, rolling stocks which use the induction motor are possible to brake trains by using AC motor. Therefore model of motor block and induction motor is needed to adapt various methods. There is Variable Voltage Variable Frequency (VVVF) as the control method of the induction motor. The torque and speed is controlled in the VVVF. The propulsion system model in the electric railroad has many sub-systems. So, the analysis of performance of the speed control is very complex. In this paper, simulation models are suggested by using Matlab/Simulink in the speed control characteristic. On the basis of the simulation models, the response to disturbance input is analyzed about the load. Also, the current, speed and flux control model are proposed to analyze the speed control characteristic in the train propulsion system.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.5
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• pp.590-595
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• 2003

In this paper, we propose a new method to the speed control of soccer robot using messy Genetic Algorithm(mGA). In order to arrive in the target of the soccer robot within the smallest time ,we propose the speed control function with several parameters which represent the reflection ratio distance and angle error. Also, we propose the algorithm for searching these parameters by using messy Genetic Algorithm. As a result of finding the optimal parameters, we can move the robot the most quickly in the target under the complex environment.