讲座预告 | 美国工程院院士Thomas M. Jahns教授

发布时间:2017-07-18

  

讲座嘉宾:Prof. Thomas M. Jahns

         美国工程院院士,IEEE Fellow

         美国威斯康辛大学麦迪逊分校教授

         东南大学客座教授

讲座时间:2017720日星期四 9:30

地点:礼东一楼春晖堂

Topics:Understanding PM Machine Fault Behavior and the Impact of Excitation on Mitigation Techniques

Despite their appealing performance characteristics, PM machines continue to face serious resistance from designers in some demanding application areas such as aerospace due to their undesirable fault characteristics.Since the PM machine’s magnetic flux cannot be turned on and off at will, machine terminal faults can pose significant threats to both the machine and its host vehicle under worst-case conditions if the shaft rotation cannot be interrupted.This presentation will discuss the characteristics and mitigation techniques for the most serious types of machine short-circuit and open-circuit fault conditions, first under the assumption of conventional excitation using voltage-source inverters (VSIs).Attention will then turn to an exploration of how these same fault conditions respond when the VSI excitation is replaced by a current-source inverter (CSI).More specifically, the major beneficial impacts of the CSI on fault-mode behavior, attributable to the presence of the dc link inductor and the elimination of the anti-parallel diode across each inverter switch, is investigated using a combination of analysis and experimental verification.In light of these benefits, the presentation will close with an abbreviated discussion of the future prospects for current-source inverters, including a discussion of the positive impact of new generations of wide-bandgap power switch on making CSIs more practical during coming years.

Biography:

Thomas M. Jahns received his bachelors, masters, and doctoral degrees in electrical engineering from MIT, Cambridge, MA (USA).Dr. Jahns joined the faculty of the University of Wisconsin – Madison (USA) in 1998 as a Grainger Professor of Power Electronics and Electric Machines in the Department of Electrical and Computer Engineering.He is a Co-Director of the Wisconsin Electric Machines and Power Electronics Consortium (WEMPEC), a university/industry consortium with over 85 international sponsors. Prior to coming to UW-Madison, Dr. Jahns worked at GE Corporate Research and Development in Niskayuna, NY (USA) for 15 years, where he pursued new power electronics and motor drive technology in a variety of research and management positions. His current research interests at UW-Madison include multiple forms of electrified propulsion, renewable energy systems, microgrids, and energy storage. Dr. Jahns is a Fellow of IEEE.He received the 2005 IEEE Nikola Tesla Technical Field Award “for pioneering contributions to the design and application of AC permanent magnet machines”.Dr. Jahns is a Past President of the IEEE Power Electronics Society and the recipient of the 2011 Outstanding Achievement Award presented by the IEEE Industry Applications Society.He was elected to the US National Academy of Engineering in 2015.