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21 results on '"Lee, Heekwang"'

14. Online Overshoot Suppression Method for EV Propulsion Motor Considering Cross-Coupled Inductance.

Author

Lee, Heekwang and Nam, Kwanghee

Subjects
*ELECTRIC inductance, *ELECTRIC motors, *ELECTRIC potential, *PERMANENT magnet motors, *ALGORITHMS, *VOLTAGE control, *MATHEMATICAL decoupling
Abstract

The effects of cross-coupled inductance are significant in high power density motors. It is observed here that the cross-coupled inductance causes current and voltage overshoots in the high-speed region. As the required voltage exceeds the voltage limit, the system becomes unstable. Here, the current dynamics are analyzed with a reduced model that incorporates a cross-coupled inductance, $L_{qd}$. Further, it is shown that $L_{qd}$ makes an uncanceled zero in the current transfer function, which invokes the overshoot. It can be compensated with an estimate $\hat{L}_{qd}$. However, it is not easy to obtain correct estimates of $L_{qd}$ in a wide current range. In this paper, an online overshoot suppression algorithm is proposed by using a high-pass filter. The simulation and experimental results provide some evidence for the effectiveness of the proposed algorithm. Finally, it is shown experimentally that the proposed algorithm cured the vehicle hunting problem after tapping off the gas pedal in a high-speed operation. [ABSTRACT FROM AUTHOR]

Published
2018
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15. Modeling and Verification of a Six-Phase Interior Permanent Magnet Synchronous Motor.

Author

Woldesemayat, Muluneh Lemma, Lee, Heekwang, Won, Sangchul, and Nam, Kwanghee

Subjects
*TORQUE control, *PERMANENT magnets, *MATHEMATICAL models, *FINITE element method, *SYNCHRONOUS electric motors
Abstract

In this paper, a new mathematical modeling for a six-phase interior permanent magnet synchronous motor (IPMSM) is presented. The proposed model utilizes two synchronous reference frames. First, the flux model in the $abcxyz$ frame is mapped into the stationary $dq$ frames and then to two synchronous rotating frames. Then, differentiating the flux models, voltage equations are derived in rotating frames. Through this analysis, the interaction between the $abc$ and $xyz$ subsystems is properly described by a coupling matrix. The torque equation is also derived using the two reference current variables. Flux model was verified through FEM analysis. Experiments were done using a 100 kW six-phase IPMSM in a dynamo system. The validity of the torque equation was checked with some experimental results under a shorted condition on an $xyz$ subsystem. [ABSTRACT FROM AUTHOR]

Published
2018
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20. EXTENDED ABSTRACTS: 10. FAILURE, FRACTURE AND BURST

Author

AN, X. M., primary, MA, G. W., additional, AOKI, K., additional, MITO, Y., additional, CHANG, C. S., additional, MAEJIMA, T., additional, BANG, S. H., additional, JEON, S., additional, CHAO, C. Y., additional, HUANG, T. H., additional, CHANG, L. S., additional, CHEN, X. H., additional, HUANG, M. L., additional, FUENKAJORN, K., additional, WANG, GANG, additional, LI, SHUCAI, additional, WANG, SHUGANG, additional, CHEN, SHOU GEN, additional, HAKAMI, H., additional, HUANG, MING-LI, additional, CHEN, XUE-HUA, additional, LU, WEI, additional, KIM, T. H., additional, SCHECHTER, D. S., additional, KOYAMA, T., additional, JING, L., additional, LI, M. T., additional, LI, S. C., additional, ZHOU, H., additional, DING, W.T., additional, MA, JIANQIN, additional, BERGGREN, BO S., additional, STILLE, HÅKAN, additional, MATSUKI, K., additional, SAKAGUCHI, K., additional, OZTURK, C. ATILLA, additional, FISNE, ABDULLAH, additional, NASUF, ERKIN, additional, REHBOCK-SANDER, M., additional, STADELMANN, R., additional, GERDES, A., additional, SUN, XIAO-MING, additional, HE, MAN-CHAO, additional, YANG, JUN, additional, WANG, SHUHONG, additional, LEE, CHUNG-IN, additional, JEON, SEOKWON, additional, LEE, HEEKWANG, additional, TANG, CHUN-AN, additional, XIAO, J., additional, SATOU, H., additional, SAWADA, A., additional, TAKEBE, A., additional, YAN, YONGGAN, additional, KANG, LIXUN, additional, ZHANG, XUYAN, additional, WANG, XUHONG, additional, YONG, S., additional, LOEW, S., additional, FIDELIBUS, C., additional, FRANK, E., additional, LEMY, F., additional, and SCHUSTER, K., additional

Published
2006
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21. EXTENDED ABSTRACTS: 9. BLOCK THEORY AND DDA

Author

AKAO, S., primary, OHNISHI, Y., additional, NISHIYAMA, S., additional, YANO, T., additional, FUKAWA, T., additional, NISHIMURA, T., additional, URANO, K., additional, CHO, SEONG WOO, additional, SONG, JAE-JOON, additional, KAMAI, R., additional, HATZOR, Y. H., additional, KIM, B. H., additional, CAI, M., additional, KAISER, P. K., additional, LI, S. C., additional, ZHANG, Q. S., additional, ZHU, W., additional, MA, S. Z., additional, JIA, H. B., additional, TANG, H. M., additional, XIA, Y. Y., additional, REN, FENGYU, additional, WANG, SHUONG, additional, WANG, PEIFU, additional, MU, TAISHENG, additional, SHI, GEN-HUA, additional, WANG, SHUHONG, additional, JEON, SEOKWON, additional, LEE, CHUNG-IN, additional, LEE, HEEKWANG, additional, KIM, JONGWOO, additional, and TANG, CHUN-AN, additional

Published
2006
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