Technological Challenges of New Energy Vehicle to Non-oriented Silicon Steel
FAN Lifeng1, QIN Meimei1, Yue Erbin2, XIAO Lijun3, HE Jianzhong4
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 JiangSu Metallurgical Technology Research Institute,Zhangjiagang 215600, China 3 Central Iron and Steel Research Institute, Beijing 100081, China 4 Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, China
Abstract: The problems of environmental protection and energy-saving put forward real challenges to the sustainable development of automotive industry. Under the condition of non-renewable resources is increasingly nervous currently,the development of new energy vehicle becomes the important way of energy saving and emission reduction, not only can reduce the oil consumption, but also cut down the total amount of the atmospheric pollutants discharged, which is significant to adjust energy structure, improve city air quality and safeguard human health. The new energy vehicle is an inevitable choice for low-carbon economy, which shows Auto industry developing trends. Non-oriented silicon steel is one of the core materials of driving Motor. The motor maximum RPM of new energy vehicle is raised from thousands of revolutions a minute to tens of thousands, even up to 200 000 r/min, the working frequency is raised from 50 Hz to hundreds to thousands Hz accordingly,which demand materials have low iron loss at high frequency. The materials must have the high magnetic induction to provide higher torque output when the vehicle starting and accelerating. Meanwhile, the materials must have the high strength to satisfy requirements of vehicle starting and braking numerous times. High-frequency low-iron loss, high magnetic induction and high strength are the hardcore indicators of non-oriented silicon steel for driving motor of new energy vehicle (H3 technology for short). Research shows that the iron loss of ordinary non-oriented silicon steel in 400 Hz increases nearly 20 times than that in 50 Hz, so it hard to meet the new energy vehicle. According to H3 Technology requirements, the impact mechanism of microinclusion, grain size, cold reduction ratio on high frequency magnetic properties was discussed in this paper. Furthermore, the latest research development and current production situation of non-oriented silicon steel for driving motor of new energy vehicle were revealed. Finally, the key scientific problems on manufacturing technology of non-oriented silicon steel for driving motor of new energy vehicle were put forward.
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