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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 6, Issue 6 - Dec 2001
Volume 6, Issue 5 - Oct 2001
Volume 6, Issue 4 - Aug 2001
Volume 6, Issue 3 - Jun 2001
Volume 6, Issue 2 - Apr 2001
Volume 6, Issue 1 - Feb 2001
Selecting the target year
A study on the development of a new sensorless drive system for the brushless DC motors
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 223~230
This power proposes a new sensorless drive system for the trapezoidal brushless DC motor generally requiring mechanical position or speed sensor. For this an indirect rotor position sensing method from the back emf waveform of non-conducting phase is explained. Back emf waveform of non-conducting is obtained from analysing terminal voltage created by making Y-connection. And an experiment is implemented with a driving system which use 87c196mc microcontroller having a peripheral associated with 3-phase signals and inverter composed of Power MOSFET. The experimental results show the validity and practicality of the proposed sensorless drive.
A Study on the Improvement of Torque Characteristics in PM Synchronous Motor
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 231~242
In this paper, we present a method to improve the torque characteristic of PMSM(Permanent Magnet Synchronous Motor) and its hardware realization. It is based on the compensation of sinusoidal current delay caused by phase winding inductances. Since coordinate transformation is not used, simple hard-wired logic in the controller design is adopted and this scheme can eliminates the delay through the coordinate transformation. The delay components are varied according to rotation speeds, but this method can also make it possible to compensate those, dynamically. The control scheme has been verified by experiments on a 4-pole 3-phase PMSM, and the generated torques are increased at whole operation speed ranges.
Full Wave Mode ZVT-PWM DC-DC Converters
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 243~249
This paper proposes a full wave mode ZVT-PWM boost converter. The converter with the auxiliary switch in a full wave mode makes possible soft switching operation of all switches including the auxiliary switch whereas the auxiliary switch is turned off with hard switching in the conventional converter. Therefore, the proposed converter reduces the turn-off switching loss and switching noise of the auxiliary switch without additional passive and/or active elements and high power density system can be realized.
Vibration and Acoustic Noise characteristic on SRM with compensating winding by two stage commutation
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 250~257
SRM drives generate large vibration and acoustic noise because it is rotated by step pulse mmf and switching commutation mechanism. The main vibration source of SRM drive is generated by rapidly variation of radial force when phase winding current is extinguished for commutation action. So the rapidly variation of radial force is repressed firstly to reduce vibrating force of SRM drive. This paper suggests an SRM excitation scheme using unidirect-short compensation winding to reduce vibration of the motor. The motor is excited by a two stage commutation method during commutation period. This paper suggests an SRM excitation scheme using unidirect-short compensation winding to reduce vibration of the motor. The motor is excited by a tow stage commutation method during commutation period. This reduction effect of vibration is verified with the result obtained in the test of prototype machine.
A Novel Series Active Power Filter Using Direct Compensating Voltage Extraction Method
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 258~264
In this paper, a new control strategy of a series active power filter suing direct compensating voltage extraction method is proposed. The proposed series active power filter and shunt passive filters are used 3-phase 3-wire power system with nonlinear load. The series active power filter complements drawbacks of the shunt passive filter and contributes to a source side harmonic reduction. We can extract the compensating voltage of the series active power filter using performance function without phase transformations. Therefore, the calculating time is short and the control method is simple compared with conventional methods. Experimental results verify that the system using the proposed method appears a good performance.
A Design of Driving Circuit for Microwave oven using Phase-shifted FB-ZVS PWM Switching
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 265~272
The traditional 60[Hz] power supply for during magnetron in microwave oven has disadvantages of heavy weight and low efficiency due to 60[Hz] High Voltage Transformer(HVT), capacitor and th phase control of thyristors. To alleviate these disadvantages, this paper proposes a 20[kHz] phase-shifted Full-Bridge(FB) Zero-Voltage-Switched(ZVS) PWM converter for driving a 600[W] magnetron in an 1[kW] microwave oven. The proposed converter has advantages of light weight and high power density.
Design for CMAC Neural Network Speed Controller of DC Motor by Digital Simulations
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 273~281
In this paper, we propose a CMAC(Cerebellar Model Articulation Controller) neural network for controlling a non-linear system. CMAC is a neural network that models the human cerebellum. CMAC uses a table look-up method to resolve the complex non-linear system instead of numerical calculation method. It is very fast learn compared with other neural networks. It does not need a calculation time to generate control signals. The simulation results show that the proposed CMAC controllers for a simple non-linear function and a DC Motor speed control reduce tracking errors and improve the stability of its learning controllers. The validity of the proposed CMAC controller is also proved by the real-time tension control.
Parameter Measurement and Identification for Induction Motors
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 282~290
The accurate identification of the motor parameters is crucially important to achieve high dynamic performance of induction motors. In this paper, th motor parameters such as stator(rotor) resistance, stator(rotor) leakage inductance, mutual inductance, and rotor inertia are measured in off-line. Stator(rotor) resistance and stator(rotor) leakage inductance are measured based on the stationary coordinate equations of induction motors. On the other hand, mutual inductance are measured under the scalar control. Finally, the inverse rotor time constant is identified in on-line using an extended kalman filter algorithm. To demonstrate the practical significance of the results, Some experimental results are presented.
A UPFC Simulation using the EMTDC
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 291~298
This paper deals with a full functional simulation of UPFC (Unified Power Flow Controller) which is a next generation FACTS (Flexible AC Transmission Systems) technology. Through analysis and modeling of he UPFC, power flow control is simulated. Active and reactive power controls, and input side bus voltage control are performed by EMTDC (Electro-Magnetic Transients in DC systems) which is a general purpose time domain simulation program for simulating power systems transients and its controls. Dynamic performances of the UPFC are verified by simulation results.
A Study on the improvement technique of adhesion characteristic for urban rolling stock
The Transactions of the Korean Institute of Power Electronics, volume 6, issue 3, 2001, Pages 299~306
It is one of the most effective methods for performance improvement of electric railway vehicle to make better the wheel-rail adhesion character. In order to research adhesion character, adhesion system is developed. The experiment system makes it possible to change various adhesion parameters. This paper studied to restrain vibration of slip speed using torque control gy means of slip speed.