• Journal of IKEEE
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• v.2 no.2 s.3
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• pp.166-172
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• 1998

Switched reluctance motor(SRM) has the advantages of simple structure, low rotor inertia and high efficiency. However, position sensor is essential in SRM in order to synchronize the phase excitation to the rotor Position. The Position sensors increase the cost of drive system and tend to reduce system reliability. This paper investigates the speed control of sensorless SRM in which the Phase current and change rate are utilized in position decision, and the period of dwell angle is variable for speed control. The proposed system consists of Position decision circuit, speed controller, digital logic commutator, switching angle controller and inverter The performances in the proposed system are verified through the experiment.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.18-21
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• 2011

In this study, basic research on the pressure control using driven pintle of modulatable thruster is presented. For this purpose, pintle thruster and pintle shape was developed. The actuator model was selected by calculating pintle load using Fluent software. Preliminary unsteady experimental results show that huge pressure oscillation is occurred as the pintle approach toward nozzle wall. From the preliminary experimental results, we could see possibility of pressure control of the modulatable thruster.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.274-276
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• 2009

최근 화석연료의 연소로 인해 발생되는 이산화탄소에 의한 환경오염이 크게 대두가 되고 있으며, 특히나 내연기관 자동차의 배출가스는 이산화탄소의 배출량이 매우 높은 실정이다. 따라서 정부에서는 친환경자동차 분야를 하나의 성장사업으로 선정하였으며, 이에 대한 많은 연구 개발이 진행 중에 있다. 본 논문에서는 출퇴근용으로 사용할 수 있는 근거리 전기자동차용 10kW급 BLDC 모터 제어기 개발에 대하여 제안을 한다. 제안된 근거리 전기자동차용 10kW급 BLDC 모터 드라이브 제어기는 한정된 공간 및 배터리 전원에서도 고토크, 고출력, 고효율, 경량화의 장점을 가지도록 개발을 하였다. 또한, BLDC 모터는 회전자 위치 정보가 필수적으로 요구되기 때문에 다양한 위치 센서를 사용할 수 있도록 홀센서, 엔코더, 레졸버를 사용할 수 있도록 모터제어기를 개발 하였다. 제안된 방식의 타당성 검증을 위해 PSIM을 이용하여 시뮬레이션 수행하였으며, 10kW급 BLDC 모터 드라이브 제어기를 제작하여 성능을 검증하였다.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.1
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• pp.109-115
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• 2010

A main technology of opening and closing a sluice gate is accurate synchronous and position control for the two cylinders when they are moving with the sluice gate together over 10[m]. Since the supply flow and supply pressure of cylinders are not constant and a nonlinear friction force of the piston in cylinders exists, a difference will be made between the displacement of two cylinders. This difference causes the sluice gate to deform and abrade, and even it may be out of order. In order to solve this problem we design two kinds of fuzzy PI controllers. The former is for a position control of two cylinders, the latter is for their synchronous control. We show some simulation results compare the performance of fuzzy PI controller to the conventional PID controller.

• Journal of Advanced Marine Engineering and Technology
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• v.28 no.1
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• pp.136-144
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• 2004

In general a hydraulic system which uses a single rod hydraulic as an actuator is modeled as a nonlinear system and reveals uncertain Parameter characteristics such as the density variation of hydraulic oil and is subject to load variations and severe disturbances during operation. A variable design-parameter fuzzy PID controller is adopted to solve these undesirable internal and external problems and its effectiveness is verified through computer simulations for control performance and real time control possibility.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.473-474
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• 2015

유도탄 구동장치용 제어기는 제한된 공간 내에서 최적의 성능 및 신뢰성을 구현하도록 구성되어야 한다. 유도탄 구동장치에 요구되는 강건제어를 구현하기 위하여 위치 및 속도 제어를 수행하였으며, 속도값은 센서 없이 HGO(High Gain Observer) 기법을 이용하여 추정하였다. 시험 및 검증을 위해 프로토타입 제어기 및 구동기를 활용하였으며, Matlab/Simulink를 통한 시뮬레이션 및 실제 시험결과가 일치함을 확인하고, 이러한 구동 제어기 개발 기법의 적절성을 제시하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.2
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• pp.138-143
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• 1999

A new control method for the precision robust position control of a brushless DC(BLDC) motor for direct drive m motor(BLDDM) system using the asymptotically stable adaptive load torque observer is presented. A precision position c control is obtained for the BLDD motor system appro성mately linearized using the fieldlongrightarroworientation method. Many of t these motor systems have BLDD motor to obtain no backlashes. On the other hand, it has disadvantages such as the h high cost and more complex controller caused by the nonlinear characteristics. And the load torque disturbance is d directly affected to a motor shaft. To r밍ect this problem, stability analysis is calTied out using Lyapunov stability t theorem. Using this results, the stability is proved and load disturbance detected by the asymptotically stable adaptive observer is compensated by feedforwarding the equivalent CUlTent having the fast response.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2000.11a
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• pp.489-492
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• 2000

브러쉬없는 직류전동기의 위치제어를 위한 퍼지가변구조제어기를 설계한다. 특히 본 논문에서는 기존의 퍼지제어 기법에서 얻을수 있는 특징으로부터 하나의 전건부 변수만을 가지는 간단한 퍼지논리제어기의 설계를 기술한다. 가변구조제어는 시스템의 파라메터 변화나 외란에 둔감한 특성을 갖는다. 하지만 리칭페이스에서는 문제가 된다. 이를 개선하기 위하여 본 논문에서는 지수항을 추가한 비선형 슬아이딩면을 구성한다. 그리고 나서 비선형적 슬라이딩면과 슬라이딩면의 변화율을 입력으로하는 퍼지 제어기를 설계한다. 이러한 2-입력 퍼지가변구조제어기의 제어 규칙표로부터 슬라이딩면 하나만을 입력으로 가지는 단일입력 퍼지 가변구조 제어기를 설계한다. 이들 제어기의 성능을 입증하기 위하여 시뮬레이션과 실험을 수행한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.27 no.2
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• pp.106-112
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• 2017

In the paper, we propose a levitation and a propulsion controller for the magnetic levitation logistic transportation system. The levitation controller is designed considering the mutual influence of the electromagnets to minimize roll and pitch movements. In order to solve the structural disadvantages of the magnetic levitation transportation system, we improve the problem of the existing controller by applying the exponential filter to the reference input. DSP-based control hardware is developed and the levitation control method is verified by levitation experiments to the air gap goal. The propulsion controller uses the space vector voltage modulation method. The propulsion controller is designed to follow the position and velocity profile by detecting the absolute position from the bar code information attached to the rail. The position control result shows satisfactory performance through the propulsion control reciprocating motion experiment.

• The Journal of the Korea institute of electronic communication sciences
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• v.14 no.1
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• pp.185-190
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• 2019

This study aims to apply the mathematical method of fractional order derivatives to the controller that controls the system response. In general, the Laplace transform of the PID controller has an exponent of the integer order of s. The derivative of the fractional order has a fractional exponent of s when it is transformed by Laplace transform. Therefore, this controller proposes a design method with the result of discrete time conversion. Because controllers with fractional exponents of s are not easy to design. This controller is applied to a standard secondary system and its performance is examined. Then, it applies to solenoid valve which is widely used in industrial field. A Luenberger's observer was designed to estimate the disturbance state and the observed state was applied to the fractional order controller. As a result, uniform and precise control performance was obtained. It was confirmed that the position error of the steady state is within 0.1 [%] and the rising time is within about 0.03 [s].