• Journal of Electrical Engineering and Technology
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• 제13권4호
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• pp.1586-1595
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• 2018

For the problem that the complexity of 3-D modeling and multi parameter optimization, as well as the uncertainty of the winding factor of axial flux permanent magnet generator with coreless windings. The complex 3-D model was simplified into 2-D analytic model, and an analytical formula for the winding factor that adapting different coreless stator winding is proposed in this paper. The analytical solution for air-gap magnetic fields, no-load back EMF, electromagnetic torque, and efficiency are calculated by using this method. The multiple objective and multivariable optimization of the maximum fundamental and the minimum harmonic content of back EMF are performed by using response surface methodology. The proposed optimum design method was applied to make a generator. The generator was tested and the calculated results are compared with the proposed method, which show good agreements.

• 조명전기설비학회논문지
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• 제13권1호
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• pp.60-68
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• 1999

본 논문은 미지이거나 변화하는 산업용 로봇 매니퓰레이터의 추종문제를 다룬다. 제시된 방법은 간접적응 제어기 구조를 근거로 퍼지추론에 의한 스위칭 구조를 통해 다중모델 적응제어기를 설계하고자 한다. 매니퓰레이터 한 개의 식별기를 이용한 다중 식별기들은 미지 관성 파라미터와 부하무게의 초기 추정치를 제외하고는 동일하다. 관절 액츄에이터에 가해진 토크입력은 매순간 로봇 동적시스템의 가장 근접한 식별기 모델에 의해 결정된다. 제시된 방법을 이용하여 용접라인 및 부품조립 자동화 설비 등의 적용 예로서 산업용 로봇 매니퓰레이터의 추종성능이 개선됨을 컴퓨터 모의 실험을 통해 보인다.

• Journal of Power Electronics
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• 제5권3호
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• pp.198-205
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• 2005

The mechanical system of a drive can often be modeled as a two- or three-mass-system. The load is coupled to the driving motor by a shaft able to perform torsion oscillations. For the automatic tuning of the control, it is necessary to know the mathematical description of the system and the corresponding parameters. As the manpower and setup-time necessary during the commissioning of electrical drives are major cost factors, the development of self-operating identification strategies is a task worth pursuing. This paper presents an identification method which can be utilized for the assisted commissioning of electrical drives. The shaft assembly can be approximated as a two-mass non-rigid mechanical system with four parameters that have to be identified. The mathematical background for an identification procedure is developed and some important implementation issues are addressed. In order to avoid the excitation of the system with its natural resonance frequency, the frequency response can be obtained by exciting the system with a Pseudo Random Binary Signal (PRBS) and using the cross correlation function (CCF) and the auto correlation function (ACF). The reference torque is used as stimulation and the response is the mechanical speed. To determine the parameters, especially in advanced control schemes, a numerical algorithm with excellent convergence characteristics has also been used that can be implemented together with the proposed measurement procedure in order to assist the drive commissioning or to achieve an automatic setting of the control parameters. Simulations and experiments validate the efficiency and reliability of the identification procedure.

• Journal of Power Electronics
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• 제15권1호
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• pp.177-189
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• 2015

The output of the controller is said to exceed the input limits of the plant being controlled when a control system operates in a non-linear region. This process is called the windup phenomenon. The windup phenomenon is not preferable in the control system because it leads to performance degradation, such as overshoot and system instability. Many anti-windup strategies involve switching, where the integral component differently operates between the linear and the non-linear states. The range of state for the non-overshoot performance is better illustrated by the boundary integral error plane than the proportional-integral (PI) plane in windup inspection. This study proposes a PI controller with a separate closed-loop integral controller and reference value set with respect to the input command and external torque. The PI controller is compared with existing conventional proportional integral, conditional integration, tracking back calculation, and integral state prediction schemes by using ScicosLab simulations. The controller is also experimentally verified on a direct current motor under no-load and loading conditions. The proposed controller shows a promising potential with its ability to eliminate overshoot with short settling time using the decoupling mode in both conditions.

• 전력전자학회논문지
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• 제14권1호
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• pp.82-88
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• 2009

일반적으로 가전기기에서는 재료비와 사용상 제약으로 인해 저가격의 위치센서 또는 센서리스 제어 방법을 사용한다. 기존의 센서리스 기어 방법을 수행할 때 속도와 부하의 변화에 따라 고정자 저항이나 역기전력 상수가 변한다. 따라서, 전동기의 제정수의 변화로 인하여 센서리스 제어시에 위치오차가 발생하게 된다. 본 논문에서는 2개의 홀센서를 사용하여 영구자석형 동기전동기의 센서리스 제어시 발생하게 되는 위치오차를 보상하는 방법을 제안하였다.

• 융합신호처리학회논문지
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• 제5권3호
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• pp.210-215
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• 2004

교류 서보전동기 동적 모델은 비선형이고 2차 저항이 변동영향이 많다. 이러한 복잡한 제어는 견실제어가 요구된다. 이러한 시스템의 동특성은 슬라이딩 모드제어를 사용함으로 파라미터나 외란 변동에 대하여 견실성을 달성할 수 있다. 본 논문은 교류 서보전동기에 의한 위치제어에 슬라이딩 모드 제어의 적용을 나타내었다. 제어방법이 유도되고 제어시스템이 설계되었다. 교류 서보전동기의 견실제어를 위해 외부 부하 파라미터에 기초한 설계방법이 제안되었다. 제안된 제어방법은 가변구조 제어기와 슬립주파수형 벡터제어에 기초하여 주어졌다. 시뮬레이션 결과는 관성모우먼트, 점성마찰 및 부하외란 변동에 결실함을 나타내었고 슬라이딩 모드를 적용한 제안된 설계방법이 유용한 것을 구명한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.302-304
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• 1996

In this paper, a new algorithm for sensorless speed control of switched reluctance motor (SRM) is proposed. It is based on the measurement of initial rate of change of phase current. The initial rate of rise of phase current mainly depends up on the phase inductance at the time instant when the phase is excited. Therefore, the measurement of initial di/dt permits rotor position estimation, which is used to trigger the next phase. In the proposed technique, there is no need to generate additional current pulses when a phase is not excited. Therefore, this scheme does not introduce the unwanted braking torque. Also, only one current measurement is made every time a phase is excited. This reduces the computational load on the micro-controller and enhances the speed range of the sensorless drive. By using this scheme it is possible to implement the sensorless control of SRM using low cost micro-controller.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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• pp.225-227
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• 2009

The conventional fixed gain PI controller is very sensitive to step change of command speed, parameter variation and load disturbances. The precise speed control of interior permanent magnet synchronous motor(IPMSM) drive becomes a complex issue due to nonlinear coupling among its winding currents and the rotor speed as well as the nonlinear electromagnetic developed torque. Therefore, there exists a need to tune the PI controller parameters on-line to ensure optimum drive performance over a wide range of operating conditions. This paper is proposed artificial intelligent-PI(AIPI) controller of IPMSM drive using adaptive learning mechanism(ALM) and fuzzy neural network(FNN). The proposed controller is developed to ensure accurate speed control of IPMSM drive under system disturbances and estimation of speed using artificial neural network(ANN) controller. The PI controller parameters are optimized by ALM-FNN at all possible operating condition in a closed loop vector control scheme. The validity of the proposed controller is verified by results at different dynamic operating conditions.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.908-925
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• 2014

Induction Motor (IM) has several desirable features for high performance adjustablespeed operation. This paper presents the design of a robust controller for vector control induction motor drive performances improvement. Proposed predictive speed controller, which is aimed to guarantee the stability of the closed loop, is based on the Poisson-Laguerre (PL) models for the association vector control drive and the induction motor; without necessity of any mechanical parameter, and requires only two control parameters to ensure implicitly the integrator effect on the steady state error, load torque disturbances rejection and anti-windup effect. In order to improve robustness, insensitivity against external disturbances and preserve desired performance, adaptive control is added with the aim to ensure an online identification of controller parameters through an online PL models identification. The proposed control is compared with the conventional approach using PI controller. Simulation with MATLAB/SIMULINK software and experimental results for a 1kW induction motor using a dSPACE system with DS1104 controller board are carried out to show the improvement performance.

• 조명전기설비학회논문지
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• 제17권4호
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• pp.36-44
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• 2003

전동기와 부하가 강성이 작은 축으로 연결되는 산업용 전동기 구동시스템에 있어서 전동기의 관성과 부하의 관성에 의해 축에 비틀림 진동이 발생한다. 이러한 문제를 해결하기 위하여 기존에 2자유도 H$_{\infty}$제어기가 제안되었다. 그러나 이 제어기는 구현하는데 어려움이 있다. 본 논문에서는 부분적인 상태궤환과 공진비제어를 이용한 2관성계의 H$_{\infty}$제어가 제안되었다. 제안된 제어기는 간단하면서도 외란 및 진동억제 성능을 만족한다.어기는 간단하면서도 외란 및 진동억제 성능을 만족한다.