16 – 18 November 2020 Shanghai, China More Info


Thursday, 27 June 2019

Chairperson: Prof. Yongdong Li, Tsinghua University, China


Traction Motors and Power Electronic Drives of Electric Powertrains for Electrified Vehicles

Traction motor and power electronic drives are called electric machine system, which has decisive impacts on energy consumption for HEV, PHEV and BEV etc. Different electric powertrains and the energy consumption of their corresponding vehicles are compared. The induction motors (IM) and interior permanent magnet (IPM) motors for the application of powertrains are discussed. This presentation is focus on IPM motor design, manufacturing and validation & testing etc.  The state of arts and their forward development trends of key components and materials for the PM motors are summarized. Different inverters from a verity of suppliers and OEMs are compared, based on their power density and capacity. The NVH of e-motors and the EMC/EMI of motor system with power electronics inverter are drawing more and more attention of vehicular electrification applications. High efficiency, more compact, low vibration and noise, safety and comfortability as well as the high ratio of performance to cost are compound requirements, which drive the integration of e-motor, power electronics and speed reducer/transmission, i.e.,“3-in-1”. The comparison is made between “3-in-1”e-powertrain system and separate-component system. The algorithm and software on system performance are also discussed, and some conclusions and useful suggestions are given finally.

WIlliam CAI Photo04

Dr. William Cai obtained his Ph.D. degree from Clarkson University, Potsdam, USA. Dr. CAI has worked in Asia, Europe and North America for over 35 years, including 15 years as researcher and professor in academic institutions and 20 years as chief engineer/designer of electric machines for HEV/PHEV/EV etc, His work institution included Remy International, Clarkson University-Potsdam of USA, Swiss Federal Institute of Technology-Zurich of Switzerland, University of Wisconsin-Madison of USA, Harbin University of Science and Technology-Harbin of China etc. Dr. Cai is one of the most productive experts in HEV/EV motor industry and designed the two mode HEV motors globally. The HEV vehicles with his designed and manufactured motors include Cadillac Escalade, Mercedes-Benz ML450, BMW X6, Chevrolet Tahoe, GMC Yukon, Dodge Durango, Chrysler Aspen, Chevrolet Silverado pick-up truck and Allison hybrid transmission etc. Dr. CAI is founder and CTO of Jing-Jin Electric (JJE) and leads the development and manufacturing of EV, PHEV & HEV motors for Karma, Chrysler, Guangzhou Auto’s GAC-Mechatronic Coupling, Geely power-split hybrid etc. JJE ranks the top on production, sale and export of EV/HEV e-motors in China. Dr. Cai is SAE Hybrid Motor Standard Committee member and IEEE senior member, Power Electronics, EV Committee member of China etc. He owned over 30 patents and published over 40 academic papers. In the early 21 century, he invented “hairpin winding” and is the pioneer to use it for traction motors. This technology is more and more accepted and applied for vehicular applications today. He obtained many international and Chinese awards,including 2015 Innovation Achievement Award of Chinese Auto etc.