Application of grain-oriented electrical steel used in super-high speed electric machines

The saturation magnetic density is lower due to the silicon content of the conventional motor core made of Non Grain-Oriented (NGO) silicon steel. It is increasingly difficult to meet the demand for high power density and high torque density of modern motors. Based on the above reasons, this paper proposed the idea of replacing the NGO silicon steel core by the Grain-Oriented (GO) silicon steel core part through a combined design. This paper mainly presents a novel thin an-isotropic GO silicon steel core used in high-speed (up to 14500rpm) traction motors. Magnetic saturation, power loss, thermal conductivity, and mechanical property analysis of the motor have been completed. Numerical modeling and experimental results have been given. The new prototype is being fabricated and it can be produced in mass production in the next few years.