Non grain oriented (NGO) electrical steel for electrical vehicle drives

Marco Tietz, Dr. Dorothée Dorner, Dr. Karl Telger, Dr. Andreas Basteck,

ThyssenKrupp Steel AG, Duisburg

As a result of today’s discussions concerning climate change and a possible Peak Oil a new trend to more and more energy efficient vehicles gets popular. Even with decreasing fuel prices there is a strong demand to reduced CO₂ emissions. In particular laws in the USA, which obligate the car manufacturers to invest in alternative drive systems, are pushing the development of electrical drive systems. Due to higher rotational speed, limited available space and higher complexity of the cooling system the requirements for NGO electrical steel increased compared to those for standard electric motors.
For this special application in electrical vehicle drives ThyssenKrupp Steel has developed the new steel grade 330-30AP. It is characterized by a low core loss of typically 75 W/kg at a frequency of 1000 Hz and a maximum polarisation of 1.0 T. Ways of reducing the core loss and characteristic properties of the grade 330-30AP are shown in the presentation.