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인덕턴스 연산에 의한 스위치드 릴럭턴스 전동기의 회전자 위치검출
나종덕(Jong -duk Na),정병호(Byun-Ho Chung),임양수(Yang-Soo Lim),김평호(Pyung-Ho Kim),조금배(Guem-Bae Cho),백형래(Hyung-Lae Baek) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper proposes a very simple method to estimate the rotor position of a switched reluctance motor. By on-line estimating the self-inductance of the motor, the rotor position of the SR motor is obtained, and a closed-loop drive system can be achieved. Proposed methods can easy implement to application with sensorless SR motor drive system. Speed 2000 rpm SR motor simulation executed with self inductance estimation and result represented. Simulation result verified the rotor position using the proposed self-inductance estimation method.
조영빈,나종덕,전계석 慶熙大學校 레이저 工學硏究所 2002 레이저공학 Vol.13 No.-
In this paper, the truncated circular patch antenna is designed with the short pin. The designed antenna has the center frequency of 4.6815GHz and fractional bandwidth of 4.04%. It has been shown that the measured results are increased by 0.87% in the fractional bandwidth, but decreased by 57.5MHz in the center frequency compared to simulations. It seems to be an error in fabrication. Also, the gain in the measurement is 5.39dB. The change of the radiation pattern by the variation of the short pin and the truncation of the patch haven't seriously affect on the performance of antenna. Therefore, the truncated circular patch antenna has the characteristics of extended bandwidth and is easier to match impedance than conventional one.