신경회로망을 이용한 릴럭턴스 동기전동기의 최적 효율제어

김민희 영남이공대학 산업기술연구소 2003 産業技術硏究 Vol.15 No.-

This paper presents an implementation of efficiency optimization of reluctance synchronous motor (RSM) using a neural network (NN) with a direct torque control (DTC). The equipment circuit considered with iron losses in RSM is theoretically analyzed, and the optimal current ration between torque current and exiting current component are analytically derived. For the RSM driver, torque dynamics can be maintained even with controlling the flux level because a torque is directly proportional to the stator current unlike induction motor. In order to drive RSM at maximum efficiency and good dynamics response, the Backpropagation Neural Networks is adapted. The experimental results are presented to validate the applicability of the proposed method. The developed control system show high efficiency and good dynamic response features with 1.0 [kW] RSM having 2.57 ratio of d/q.

저속영역에서 속도검출기가 없는 전기자동차 구동용 유도전동기 백터제어 엘고리즘

金珉會 영남이공대학 1997 論文集 Vol.26 No.-

The paper describes advanced induction motor control algorithm for electric vehicle derive without speed sensor at low speed range. The control algorithm use voltage and current sensors in a current regulated delta modulation (CRDM) loop control with rotor speed estimation and PWM voltage source inverter. On-line rotor speed estimation is based on utilizing parallel model reference adaptive control system (MRAC). The modified flux model for speed estimator uses ω_c-adaptation scheme, where inputs are estimated ω_r, and ω_(sl). The estimated flux components in this model can be compensated from the effects of offset errors on integral. It can be compensated to the parameter variations and torque fluctuation with speed estimation in less then 25 rad/sec. In a simulation, the proposed induction motor control algorithm for electric vehicle derive without speed sensor at very low speed range are shown to operate very well in spite of variable rotor time constant and fluctuating load without change the controller parameters. The suggested control strategy and estimation method have been validated by simulation study.

고성능 DSP를 이용한 위치센서 없는 스위치드 릴럭턴스 전동기의 제어시스템

김민회,백원식 영남이공대학 2004 論文集 Vol.33 No.-

This paper presents a position sensorless control system of Switched Reluctance Motor (SRM) using high performance Digital Signal Processor (DSP). The control of SRM depends on the commutation of the stator phases in synchronism with the rotor position. The position sensing requirement increases the overall cost and complexity. In this paper, the current-flux-rotor position based position sensorless operation of SRM is presented. Neural network is adapted for the approximation of a nonlinear function of the rotor position versus current and flux-linkage, and is trained by sufficient experimental data Much calculation time demanded for neural network application is solved by using high performance DSP. Experimental results for a 1-hp SRM is presented for the verification of the proposed sensorless algorithm.

속도추정에 의한 유도전동기의 벡터제어에 관한 연구

김동희,정경채,김민희,황돈하,이달해 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1

Recently, the vector controlled induction motors are widely used in the industrial AC servo system requiring high accuracy and fast response. However, in the conventional vector control, by using of speed sensors for speed information of the motor, the system design has been restricted. This paper proposes te vector control system based on speed estimation controls motor speed by estimating angular speed of secondary flux linkages from voltage equations of induction motor without speed and voltage sensor. To stabilize the control system for estimation, the ??-axis flux keeps to zero by the compensation control method with state feedback. In addition, the whole control system is designed to be controlled by software in microcomputer. Computer simulations domonstrates that the control characteristics of the proposed vector control system based on speed estimation are satisfactory in both dynamic performance and accuracy.

電壓形 PWM Inverter에 依한 誘導電動機의 精密 速度制御

金玟會,鄭瓊採,金東熙,李達海,黃敦夏 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1

For precision control of Induction Motor with Voltage Source PWM Inverter, the current component should be converted into the voltage one. We are in difficulties for precision control with simple current feedback control because of the oscillation in system and torque ripple on high speed rotation and transient switching resulted from the disturbance which is generated by the mutual interference between d-axis and q-axis during conversion. This paper propose linearized Decoupling Control Theory in Field-Oriented Control and presents controllable system with Microcomputer software in the whole control system. In addition, by experiment it is proved that the system is controlled well in both steady and transient states. The proposed system is expected to be applied in industrial AC Servo System.

MARS를 이용한 속도검출기가 없는 유도전동기의 벡터제어에 관한 연구

임태윤,황돈하,김동희,김민회 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

This paper describes a speed sensorless algorithm for vector control system with compensated rotor time constant variation of induction motor using a model reference adaptive system (MRAS). The proposed system is composed of two MRAS, one is a rotor speed estimation identification by a back-EMF observer, another is a rotor time constant identification by magnetizing current observer. As a result, robust field oriented control system of induction machine against paremeter variation can be realized. The suggested control strategy and estimation method have been validated by simulation study. In the simulation using Matlab/Simulink, the proposed speed sensorless vector control system operated very well in spite of variable rotor time constant and load fluctuation.

A Five-Phase IM Vector Control System Including 3rd Current Harmonics Component

Min-Huei Kim,Nam-Hun Kim,Won-Sik Baik 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5

In this paper an effective five-phase induction motor (IM) and drive methods are proposed. Due to the additional degrees of freedom, five-phase IM drive presents unique characteristics. One of them is the ability of enhancing the torque producing capability of the motor. Also five-phase motor drives possess many other advantages compared to the traditional three-phase motor drives. Such as, reducing the amplitude and increasing of frequency of torque pulsation, reducing amplitude of current per phase without increasing the voltage per phase and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings and the produced back-EMF is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents. For presenting the superior performance of the proposed five-phase IM, the motors are also analyzed on synchronously rotating reference frame. To supply trapezoidal current waveform and exclude effect of 3rd harmonic current, new control stratagem is proposed. Experimental results clearly demonstrated a better steady state characteristic with proposed control method of a five-phase induction motor

A Five-Phase Induction Motor Speed Control System Excluding Effects of 3rd Current Harmonics Component

Kim, Min-Huei,Kim, Nam-Hun,Baik, Won-Sik The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3

In this paper an effective five-phase induction motor (IM) and its drive methods are proposed. Due to the additional degrees of freedom, the five-phase IM drive presents unique characteristics for enhancing the torque producing capability of the motor. Also the five-phase motor drives possess many other advantages when compared to traditional three-phase motor drives. Some of these advantages include, reducing the amplitude and increasing the frequency of the torque pulsation, reducing the amplitude of the current without increasing the voltage per phase and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated winding, the produced back electromotive force (EMF) is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus the third harmonic of the currents. For demonstrating the superior performance of the proposed five-phase IM, the motors are also analyzed on the synchronously rotating reference frame. To supply trapezoidal current waveform and to exclude the effect of the $3^{rd}$ harmonic current, a new control stratagem is proposed. The proposed control method is based on direct torque control (DTC) and rotor flux oriented control (RFOC) of the five-phase IM drives. It is able to reduce the acoustical noise, the torque, the flux, the current, and the speed pulsations during the steady state. The DTC transient merits are preserved, while a better quality steady-state performance is produced in the five phase motor drive for a wide speed range. Experimental results clearly demonstrated a more dynamic steady state performance with the proposed control system.

A High-Performance Sensorless Control System of Reluctance Synchronous Motor with Direct Torque Control by Consideration of Nonlinearly Inductances

Min-Huei Kim,Nam-Hun Kim,Won-Sik Baik 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.2

This paper presents an implementation of digital control system of speed sensorless for Reluctance Synchronous Motor (RSM) drives with direct torque control (DTC) The problem of DTC for high-dynamic performance RSM drive is generating a nonlinear torque due to a saturated nonlinear inductance curve with various load currents The control system consists of stator flux observer, compensating inductance look-up table, rotor position/speed/torque estimator, two hysteresis band controllers, an optimal switching look-up table, lGBT voltage source invcrter, and TMS320C31 DSP controller. The stator flux observer is based on the combined voltage and current model with stator flux feedback adaptive control that inputs are the compensated inductances, current and voltage sensing of motor term mal with estimated rotor angle for wide speed range The rotor position is estimated by observed stator flux-linkage space vector The estimated rotor speed is determined by differentiation of the rotor position used only m the current model part of the flux observer for a low speed operating area. It does not require the knowledge of any motor parameters, nor particular care for motor starting, In order to prove the suggested control algorithm, we have simulation and testing at actual experimental system. The developed sensorless control system is showing a good speed control response characteristic results and high performancc features in 20/1500 rpm with 1.0Kw RSM having 2.57 ratio of d/q reluctancc.

A Five-Phase Induction Motor Speed Control System Excluding Effects of 3rd Current Harmonics Component

Min-Huei Kim,Nam-Hun Kim,Won-Sik Baik 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3

In this paper an effective five-phase induction motor (IM) and its drive methods are proposed. Due to the additional degrees of freedom, the five-phase IM drive presents unique characteristics for enhancing the torque producing capability of the motor. Also the five-phase motor drives possess many other advantages when compared to traditional three-phase motor drives. Some of these advantages include, reducing the amplitude and increasing the frequency of the torque pulsation, reducing the amplitude of the current without increasing the voltage per phase and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated winding, the produced back electromotive force (EMF) is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus the third harmonic of the currents. For demonstrating the superior performance of the proposed five-phase IM, the motors are also analyzed on the synchronously rotating reference frame. To supply trapezoidal current waveform and to exclude the effect of the 3<SUP>rd</SUP> harmonic current, a new control stratagem is proposed. The proposed control method is based on direct torque control (DTC) and rotor flux oriented control (RFOC) of the five-phase IM drives. It is able to reduce the acoustical noise, the torque, the flux, the current, and the speed pulsations during the steady state. The DTC transient merits are preserved, while a better quality steady-state performance is produced in the five phase motor drive for a wide speed range. Experimental results clearly demonstrated a more dynamic steady state performance with the proposed control system.