讲座时间：2017年5月12日（周五）, 13:00—15:00
讲座地点：泰山科研楼226
讲座题目：电动汽车驱动电机性能比较、直流母排电压温度管理
讲座摘要：
The presentation will discuss 2 Ph.D. research projects at McMaster University:
(1) “Comparative Study Between Interior and Surface Permanent Magnet Traction Machine Designs”,
Interior permanent magnet (IPM) brushless (sychronous) machines are a popular technology choice in commercial hybrid- or all-electric vehicles (HEVs/EVs), such as the Toyota Prius, GM Chevy Volt, Lexus LS, Nissan Leaf, for example. Much is claimed of IPM topologies in terms of their saliency torque contribution, minimum magnet mass, demagnetisation withstand, wide flux-weakening capability and high operational efficiencies when compared to brushless machines having surface mounted permanent magnets. The presentation will discuss a comparative study assessing the design and performance attributes of an example IPM machine, as implemented in the Nissan Leaf EV, when compared to a surface permanent magnet (SPM) machine designed within the main Nissan Leaf machine dimensional constraint.
(2) “The Impact of DC-Link Voltage and Temperature Variations on EV Traction System Design”
DC-link voltage and temperature variations are critical issues when designing an electric vehicle (EV) traction system. However, systems are generally reported at fixed voltage and temperature and may not therefore be fully specified when considering the variation of these parameters over full vehicle operating extremes. The presentation will give an assessment of power-train options based on the Nissan Leaf vehicle, which is taken as a benchmark system providing experimental validation of the study results. The Nissan Leaf traction machine is evaluated and performance assessed by considering DC-link voltage and temperature variations typical of an automotive application, showing that the system lacks performance as battery state of charge decreases. An alternative traction machine design is proposed to satisfy the target performance. The vehicle power-train is then modified with the inclusion of a DC/DC converter between the vehicle battery and DC-link to maintain the traction system DC-link voltage near constant. A supercapacitor system is also considered for improved system voltage management. The trade-offs for the redesigned systems are discussed in terms of electronic and machine packaging, and mitigation of faulted operation at high speeds.
主讲人简介：
Nigel Schofield received the degrees of B.Eng. (Hons.) in Electrical Power Engineering, and Ph.D. for research on the field-weakening capability of brushless permanent-magnet traction machines from the University of Sheffield, UK. He held academic posts at the Universities of Sheffield and Manchester, UK. He has also been a Design Engineer in industry, UK. From 2013 to 2017 he was Full Professor with Tenure in the ECE Dept. at McMaster University, Ontario, Canada. In May 2017 he started in a new post as Professor in Electrical Engineering at the University of Huddersfield, UK. His research interests include electro-magnetic power-trains for all- and hybrid-electric vehicles.He is a member of the IET and IEEE and a Chartered Engineer.
Contact details:
Nigel Schofield
University of Huddersfield, UK
Email: n.schofield@hud.ac.uk
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