• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.40 no.1
• /
• pp.1-8
• /
• 2016

In this study, we propose a control algorithm for Inertially Stabilized Platforms (ISP), which combines Disturbance Observer (DOB) with conventional proportional integral derivative (PID) control algorithm. A single axis ISP system was constructed using a direct drive motor. The joint friction was modeled as a nonlinear function of joint speed while the accuracy of the model was verified through experiments and simulation. In addition, various Q-filters, which have different orders and relative degrees of freedom (DOF), were implemented. The stability and performance of the ISP were compared through experimental study. The performance of the proposed PID-plus-DOB algorithm was compared with the experimental results of the conventional double loop PID control under artificial vehicle motion provided motion simulator with six DOF.

• Journal of Aerospace System Engineering
• /
• v.12 no.1
• /
• pp.27-34
• /
• 2018

In this study, the generating of torque regarding the Control Moment Gyro (CMG) is proportional to the angular velocity of gimbal. This is the case because gimbal affects the attitude control of the satellite directly, and it is necessary to reduce the incidence of torque ripple of gimbal. In this paper, the cause of the torque ripple of gimbal is reviewed and mathematically modeled by assuming the friction imbalance of bearing, the magnetic field and the phase current imbalance of the motor. We are able to confidently estimate the modeling parameters of gimbal disturbance using a constant speed test, and then analyze the influence of applying feedforward control to our modeling. Additionally, the simulation results show that the torque ripple and angular velocity fluctuations are reduced when apply this modeling to the identified study parameters. Finally, we present the disturbance reduction technique using our disturbance modeling.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.17 no.5
• /
• pp.859-866
• /
• 2022

Active disturbance rejection control is a method in which the disturbance is removed from the controller by estimating the state variable using the Luenberger observer. The Luenberger observer is estimated by defining a nonlinear term including disturbance with constant characteristics in a steady state as a state variable. It can be shown that the speed tracking performance is improved by compensating the estimated state variable to the PI controller and the IP controller. The disturbance removal performance of the tracking control can be confirmed by observing that the estimated state error is within 1.9 [%] in the case of load fluctuation and the steady-state state tracking error converges to zero.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.16 no.3
• /
• pp.511-518
• /
• 2021

In order to obtain a good tracking performance of the motor, it is necessary to design a controller that can respond to a disturbance by including a disturbance observer. The disturbance observer of the motor is designed to estimate the load torque and the back electromotive voltage based on the first-order low-pass filter. A PI controller and an IP controller were designed to compare the correlation between the disturbance observer and the controller and to obtain improved control performance. To check the performance of the designed observer and the controller, it was applied to a 120 [W] class BLDC motor. As a result, overshoot is reduced, and it can be seen that the steady-state error converges to zero.

• Proceedings of the KIPE Conference
• /
• 2005.07a
• /
• pp.535-537
• /
• 2005

최근의 산업용 서보 구동 응용 분야에서는 전 운전 영역에서 위치 추종에 대한 높은 정밀도와 빠른 응답 특성이 요구된다. 그러나 부하 외란은 시스템의 속도 응답 특성을 나쁘게 하여 위치 추종에 대한 빠른 응답 특성과 높은 정밀도를 기대하기 어렵게 만든다. 따라서 고성능 위치/속도 제어를 위해서는 부하 토크의 추정이 필수적이다. 본 논문에서는 SVR에 기반한 실시간 부하 토크 관측기를 제안한다. 제안된 방법은 오프라인 SVR 학습을 통하여 부하 토크 관측기를 만들고, 운전 데이터로부터 부하 토크를 추정하여 실시간으로 전향 보상한다. 제안된 방법의 타당성을 위해 다양한 실험을 수행하였다.

• Proceedings of the KIPE Conference
• /
• 2018.07a
• /
• pp.408-409
• /
• 2018

본 논문에서는 BLDC와 PI 제어기를 사용하여 전동기의 속도를 제어할 때 전차원 관측기를 적용하여 부하 토크를 추정 및 보상함으로써 속도 리플을 줄일 수 있는지를 검증하고자 하였다. 모터 구동 시에는 필연적으로 부하 토크가 외란으로 포함되며 그로 인해 제어대상인 속도에 리플을 야기하게 된다. 따라서 보다 안정적인 제어를 위해서는 이 외란을 보상해주는 것이 필요한데, 관측기를 이용하면 별도의 장비나 센서 없이 이 부하 토크를 효과적으로 보상해 줄 수 있다.

• Journal of the Institute of Convergence Signal Processing
• /
• v.8 no.2
• /
• pp.119-123
• /
• 2007

This paper investigates a speed sensorless control of induction motor. The control strategy is based on MRAS(Model Reference Adaptive System) using load-torque observer as a reference model for flux estimation. The speed response of conventional MRAS controller characteristics is affected by variations of load torque disturbance. In the proposed system, the speed control characteristics using a load-torque observer control isn't affected by a load torque disturbance. Control algorithm that propose whole system through MATLAB SIMULINK because do modelling simulation result are presented to prove the effectiveness of the adaptive sliding mode controller for the drive variable load of induction motor. Therefore we hope to be extended in industrial application.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.17 no.5
• /
• pp.867-872
• /
• 2022

The effect of load is an important factor in precise speed control of a motor. n this study, we design a state observer that can estimate and define one state of disturbance including errors and nonlinear terms of mathematical models, which is not easy with a mathematical model. Then, the observation gain is set so that the estimation error of the state observation converges to 0, and the estimated state is used in the back stepping controller to design a controller capable of precise speed tracking. As a result of applying to 1 [hw] class Interior Permanent Magnet Synchronous Motor, excellent stste variable observation and tracking performance can be confirmed.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.40 no.4
• /
• pp.243-250
• /
• 2003

In this paper, the speed controller of permanent-magnet synchronous motor (PMSM) using the RBF neural (NN) disturbance observer is proposed. The suggested controller is designed using the input-output feedback linearization technique for the nominal model of PMSM and incorporates the RBF NN disturbance observer to compensate for the system uncertainties. Because the RBF NN disturbance observer which estimates the variation of a system parameter and a load torque is employed, the proposed algorithm is robust against the uncertainties of the system. Finally, the computer simulation is carried out to verify the effectiveness of the proposed method.

• Proceedings of the KIPE Conference
• /
• 2010.07a
• /
• pp.115-116
• /
• 2010

본 논문에서는 PMSM(Permanent Magnet Synchronous Motor)을 이용한 재봉틀 구동시스템을 개발하였다. 전차원 관측기를 이용하여 속도를 추정하고, 벨트(Belt)에 의한 외란 토크를 추정하여 보상하였다. 개발된 재봉틀 구동시스템을 실제 재봉틀에 장착하여 그 효용성을 검증하였다.