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Sensorless Speed Control of Induction Motor using Current Compensation
Oh, Sae-Gin,Kim, Jong-Su,Kim, Sung-Hwan The Korean Society of Marine Engineering 2003 한국마린엔지니어링학회지 Vol.27 No.4
A new method of induction motor drive, which requires neither shaft encoder nor speed estimator, is presented. The proposed scheme is based on decreasing current gap between a numerical model and an actual motor. By supplying the identical instantaneous voltage to both model and motor in the direction of reducing the current difference. the rotor approaches to the model speed. that is. reference value. The indirect field orientation algorithm is employed for tracking the model currents. The performance of induction motor drives without speed sensor is generally characteristic of poorness at very low speed. However, in this system, it is possible to obtain good speed response in the extreme low speed range.
오세진(Sae-Gin Oh),임태우(Tae-Woo Lim),김종수(Jong-Su Kim),길병래(Byung-Lea Kil),박상균(Sang-Kyun Park),김만응(Mann-Eung Kim),이경진(Kyung-Jin Lee),오진숙(Jin-Suk Oh),김명환(Myoung-Hwan Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
The strengthened regulations for atmospheric emissions from ships have caused a necessity of new, alternative power system in ships for the low pollutant emissions and the high energy efficiency. Recently, new kinds of propulsion power system such as fuel cell system, which use hydrogen as an energy source, have been sincerely considered. The purpose of this work is to predict the performance of methanol fueled SOFC/GT hybrid power system and to analyze the influence of operating temperature of stack, current density of stack, pressure ratio of turbine, temperature effectiveness of recuperator, turbine inlet temperature.