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확장형 감소차수 관측기를 이용한 전기식 조종날개 구동장치의 슬라이딩 모드 제어
구정회,Gu, Jeong-Hoi 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.3
The objective of this paper is to design a sliding mode controller of an electro-mechanical fin actuation system using extended reducer-observer(ERO) which is used in order to estimate the velocity. The employed observer enables proper estimation of the plant state variables, even in the case of the constant or slow varying load torque disturbances. The effectiveness of this control scheme is verified by comparison with a PID control through a series of simulation studies. The simulation results show that the sliding mode control designed with the ERO gives good control performances.
새로운 능동형 커먼 모드 전압 감쇄기를 이용한 고주파 누설전류 억제
구정회(Jeong-Hoi Gu),빈재구(Jae-Goo Bin),박성준(Sung-Jun Park),김철우(Cheul-U Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper propose a new active common-mode voltage damper circuit that is capable of suppressing a common-mode voltage produced in the PWM VSI. The new active common mode voltage damper is consisted of a half-bridge inverter and a common mode transformer with a blocking capacitor. Principle of the active common mode damper is as follow, by applying the compensation voltage which has the same amplitude and opposite polarity to the PWM inverter system. So, common mode voltage and high frequency leakage current can be reduced Simulated and experimental results show that common-mode voltage damper makes contributions to reducing a high frequency leakage current and common-mode voltage.
유압구동장치 서보밸브 옵셋 제거를 위한 유압궤환구조 PI제어기 설계
구정회(Jeong-Hoi Gu),김인주(In-Ju Kim),최장영(Jang-Young Choi),이상정(Sang-Jeong Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.6
Servovalves have been used to control the position of the hydraulic actuation system for missile. However, the null shift of the servovalve can be vary depending on the supply pressure, vibration, shock and temperature. This problem causes position error in the hydraulic actuation system. Therefore, we designed an algorithm to remove the servovalve offset by adding an integrator to the existing proportional controller. However, the integrator usually has drawbacks such as stability and wind-up problems. To overcome this problem, we propose the design of a hydraulic feedback structure PI controller with a hydraulic pressure detector and an integral limiter that satisfies fault tolerance. Several experiments were performed to verify the proposed method. It is shown that the proposed hydraulic feedback structure PI controller is more stable than the conventional PI controller when the hydraulic pressure is supplied. Compared with conventional proportional controller, the proposed method is very efficient to overcome position error of the hydraulic actuation system caused by the null shift of the servovalve. Moreover, the dynamic response of the proposed method is similar to the existing proportional controller.
선형홀센서와 고성능 미분기를 이용한 BLDC모터의 속도신호 구현
구정회(Jeong-Hoi Gu),최장영(Jang-Young Choi) 대한전기학회 2018 전기학회논문지 Vol.67 No.7
BLDC motor is widely used as a servo motor due to high efficiency, high power density, low inertia, and low maintenance. However, BLDC motor generally needs position and velocity sensors to control actuation system. Usually, analog tachometers and encoders have been used for velocity feedback sensors. However, using these types of sensors have problems such as the cost, space, and malfunction. So, This paper is to propose a new velocity measurement method using linear hall-effect and enhanced differentiator for BLDC motor. In order to verify the feasibility of the proposed method, several simulations and experiments are performed. It is shown that the proposed velocity measurement method can satisfy the requirements without using of velocity sensor.
구정회(Jeong-Hoi Gu),송치영(Chi-Young Song) 대한전기학회 2010 전기학회논문지 Vol.59 No.1
The objective of this paper is to propose a new velocity measurement method for an electro-mechanical fin actuator. The model of the electro-mechanical fin actuator includes uncertainties such as unknown disturbances and parameter variations in flight condition. So, an electro-mechanical fin actuator system needs robust control algorithm which requires not only position information but also velocity information. Usually, analog tachometers have been used for velocity feedback in an electro-mechanical fin actuator. However, using these types of sensors have problems such as the cost, space, and malfunction. These problems lead to propose a new velocity measurement method using linear type Hall-effect sensor. In order to verify the proposed method, several experiments are performed using Model Following Sliding Mode Controller(MFSMC). It is shown that the MFSMC with a new velocity measurement method using linear type Hall-effect sensor can satisfy the requirements without using of velocity sensor.
자속 차폐벽을 갖는 선형 홀센서 BLDC 모터를 이용한 전기식 조종날개 구동장치의 위치 제어
구정회(Jeong-Hoi Gu),배륜준(Ryun-Jun Bae),최장영(Jang-Young Choi) 대한전기학회 2021 전기학회논문지 Vol.70 No.2
In general, position sensor and velocity sensor are used to design robust controller of the electro-mechanical fin actuator system. However, the use of such a sensor causes problems such as an increase in cost, an additional space for mounting, and a decrease in system reliability due to a sensor failure. To overcome these problems, rotor position sensor of the BLDC motor was replaced with linear type Hall-effect sensor having a magnetic flux shielding wall from the latch type Hall-effect sensor. The conventional position sensor and velocity sensor were removed through a position and velocity implementation algorithm using the analog output of the linear type Hall-effect sensor. In order to prove the validity of the proposed method, various comparison tests were performed with the existing position/velocity sensors. As a result of the test, the method proposed in this paper can obtain the position response similar to the case of applying the conventional position/velocity sensor.
박창규(Chang Kyoo Park),구정회(Jeong Hoi Gu),이창섭(Chang Seop Lee),김인주(In Ju Kim) 한국추진공학회 2023 한국추진공학회 학술대회논문집 Vol.2023 No.5
본 논문에서는 모터 드라이브에 사용되는 홀센서를 이용한 BLDC 모터 속도제어 방법에 대하여 기술하였다. 일반적으로 BLDC모터 속도는 타코미터, 레졸버 등의 속도센서를 이용하여 제어된다. 반면, 본 논문에서는 BLDC 모터와 기어펌프로 구성된 연료공급용 모터펌프의 속도제어를 위해 홀센서를 이용하였다. 홀센서는 디스크리트 신호 특성을 가지므로 노이즈에 강건하지만 저속에서 느린 속도 갱신 때문에 제어성능이 저하하는 단점이 있다. 본 논문에서는 속도예측모델을 사용하여 저속에서 속도 신호의 데드존을 제거함으로써 저속 속도제어 특성을 개선할 수 있음을 보였다. 속도예측모델은 연료모터펌프 모델과 연료분사기 특성을 이용하여 개발될 수 있다. In this paper we showed how to control the speed of BLDC motor with hall sensor which is used for BLDC motor drive. In general, BLDC motor‘s speed is controlled with kinds of speed sensor such as tachometer, resolver. Meanwhile, we used hall sensor as speed sensor to control the fuel supply motor-pump which is composed of BLDC motor and gear pump. The speed acquired from hall sensor is insensitive to noise because hall sensor signal is discrete. At low speed however due to long acquisition time of hall sensor, control performance is degraded. In this paper we showed that it is possible to upgrade control performance at low speed by eliminating deadzone of speed signal with speed prediction model. The speed prediction model can be developed from the model of fuel supply motor-pump and the characteristic of injector.