题目：A high-performance permanent-magnet-free machine for wide load ranges
报告人：Longya Xu（徐隆亚）教授，IEEE Fellow
内容简介：This talk presents the design and operational analysis of a high-performance squirrel-cage induction machine intended for wide load range applications, including electric traction and highly dynamic industrial loads. High performance operation and high torque density are achieved through a combination of four strategies: (1) An inverter-dedicated design in which stator and rotor configurations are based on low slip; (2) High-performance materials including high flux cobalt alloy and copper rotor bars; (3) Optimized pole counts with relatively high frequency to avoid field weakening in most load ranges; (4) Adaptive flux control to maintain high efficiency over a 10:1 load range. The cost trade-offs for cobalt alloys is discussed and feasibility studied. The design and operation of the induction machine’s broad motor behavior are presented, and simulation results are used to validate its application in electric vehicles. It is shown that the design achieves 4x higher torque density than conventional machines of the same size. At the same time, nominal efficiency of the design is greater than 96% over a wide load range, with a peak efficiency as high as 98%.
Longya Xureceived his M.S. and Ph.D. degrees from the University of Wisconsin-Madison, in 1986 and 1990 both in Electrical Engineering. He joined the Department of Electrical Engineering at The Ohio State University in 1990, where he is presently a full professor. Dr. Xu is the founding director of the newly established Center of High Performance Power Electronics (CHPPE) at The Ohio State University, supported by The Ohio Third Frontier Program ($9.8M). Recently he also won a major DoE Award ($2.7M) working on Silicon Carbide based MMC converter for high power density variable drives.
Dr. Xu’s research and teaching interests include dynamics and optimized design of special electrical machines and power converters for variable speed systems, application of advanced control theory and digital signal processor for motion control and distributed power systems in super-high speed operation. He has conducted many research projects on electrical and hybrid electrical vehicles and variable speed constant frequency wind power generation systems.
Dr. Xu is an IEEE Fellow and a well-recognized individual in the related professional community. He has received several IEEE prestigious awards, including theFirst Prize Paper Award1992 from Industry Drive Committee IEEE/IAS,Best Transaction Paper Award 2013andOutstanding Achievement Award 2014 from IEEE Industry Application Society.