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목형수,양두영,이나리,강순신,한영재,이동찬,김창완 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.3
A linear synchronous motor (LSM) is generally used for high-speed maglev train propulsion. For the LSM, the permanent magnet is installed on the train and the stator on the railway. But The stator winding is not practical to install the LSM as the same length as the train travel distance because the electric power is supplied to the entire railway at once, power loss will be significant. Therefore, several stators are separated from each other by section and the power is supplied to each section when maglev is on the section. For this purpose, it is necessary to develop an accurate control system to control each section and synchronize adjacent sections during a section change. In this paper we developed a control system for the section change, which is essential for the operation of the Maglev train using the LSM as its propulsion system, and this control system was combined with the multibody dynamics analysis of the Maglev to develop a state-of-the-art control algorithm; the performance of this control algorithm was proven to be excellent. Furthermore, we applied the analysis technique of electro-mechanical coupling system, which can analyze both the control algorithm of the section change and the multibody dynamics analysis of the Maglev at the same time, to examine the running performance of the Maglev train with different design variables in different running conditions.
다상 브러시리스 교류전동기의 시뮬레이션을 위한 혼합 모델
목형수,홍준희,김상훈,Mok, Hyung-Soo,Hong, Jun-Hee,Kim, Sang-Hoon 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.7
다상 브러시리스 교류전동기의 역기전력 파형은 일반적으로 이상적인 정현파나 사다리꼴 형태가 아니다. 그러므로 이상적인 역기전력을 가정하는 기존의 모델로 다상 BLAC 전동기의 특성을 시뮬레이션 또는 해석하는 경우에는 많은 오차가 발생할 수 있다. 본 논문에서는 이러한 오차를 감소시키기 위해 FEA 기반의 회로 및 수식 기반의 혼합 모델링 기법을 이용한 상변수 모델을 제안하였다. FEA로부터 얻어진 역기전력 파형을 포함한 상모델의 파라미터를 사용하는 제안된 혼합 모델링기법은 임의의 역기전력 전압파형을 갖는 다상 브러시리스 교류전동기의 시뮬레이션과 해석에 사용할 수 있다. 제안한 기법을 7상 BLAC 전동기에 적용한 시뮬레이션 및 실험 결과로부터 모델의 타당성을 입증하였다. The emf of a permanent magnet multi-phase BLAC(Brushless AC) motor is generally a non-sinusoidal or a non-ideal trapezoid wave. So, conventional modeling using a sinusoidal or an ideal trapezoid emf can result in errors to simulate and analyze the properties of a multi-phase BLAC motor. To reduce the modeling error, this paper proposes a phase variable model, which is obtained from a hybrid modeling technique consisting of Finite Element Analysis(FEA) based circuits and equations. Since the phase model parameters including the emf waveform were obtained using FEA, the proposed hybrid modeling technique can be used to implement a simulation model for multi-phase BLAC motors with any emf voltage waveforms. Adequacy of the proposed model was established from the simulation and experimental results for a seven-phase BLAC motor.
대용량 모터드라이브 적용을 위한 새로운 이중접속방식의 멀티스텝 인버터
목형수,양승욱,최규하 전력전자학회 2006 전력전자학회 논문지 Vol.11 No.3
Now, in this paper, going to present you with an idea related to a new inverter of multi-step voltage source, that is, the double-connected 12-step inverter with an auxiliary circuit. It possibly can be 24-step inverter with 3-phase voltage source which will enable us make full application even to medium and high power-level Motor drive, UPS, STATCOM, SVC, etc. in which the PWM method could not be employed. 24-step operation can be obtained from the link between the existing 12-step inverter and the additional auxiliary circuit in which the transformer of auxiliary circuit generates ripple voltage delivered to the inverter. Through a lot of experiments and simulations, (from which the validity of this scheme is confirmed,) we came to the conclusion that the increase of the primary winding number on transformer by 2N(N=1,2,3....) leads to the 12M-step(M=2,3,4...) inverter. The validity of the proposed scheme is confirmed by the simulated and experimental results. 본 논문에서는 전압원 인버터의 출력전압 파형을 개선하여 PWM방식을 사용할 수 없는 중대용량급 모터드라이버 및 UPS, STATCOM, SVC등에 적용하기 위한 새로운 3상 전압원 24-스텝 인버터를 제안한다. 보조회로로서 사용한 컨버터로 리플전압을 발생시키고 이를 기존의 12-스텝 인버터에 주입하는데 한대의 링크를 사용하면 12-스텝 동작이 24-스텝으로 전환되며 보조 변압기의 1차 권선을 2N(N=1,2,3...)으로 늘리면 12M-스텝(M=2,3,4..)으로 전환된다. 본 방식의 타당성을 실험 및 시뮬레이션을 통하여 입증하였다.
부하 轉流식 전류형인버터 - 유도전동기 시스템에서의 고조파공진 해석 및 저감
목형수,김기용 서울産業大學校 1994 논문집 Vol.39 No.1
In the LCCSI-induction machine system, there are two different resonant phenomena. One is the fundamental resonance occuring between the output capacitor and the machine mutual inductance. This resonance is significant in the designing of the inverter and control loop. The other resonant phenomeanon is the harmonic resonance occurring between the output capacitor and the machine leakage inductances. This resonance is significant in avoiding escessive torque and DC link voltage. To avoid adverse effects due to harmonic resonance, a solution is proposed using a special kind of one-notch current PWM(Pulse Width Modulation).