Exploiting the High Saturation Flux Density of the GOES in Radial Flux PMSM

Silicon-Iron Grain-Oriented Electrical Steel (GOES) shows a better performance in terms of permeability, saturation flux density and iron losses, especially when it is magnetized in the easy magnetization direction, compared to the Non-Oriented Electrical Steel (NOES). To improve the performance of concentric winding permanent magnet synchronous motors for automotive applications, this paper presents the use of GOES for segmented teeth in a stator magnetic circuit. The aim is to exploit the GOES characteristic in term of saturation to improve the efficiency of the electric motor by reducing the iron losses, and to improve the torque density and the power density. The results about the maximum torque and iron losses are compared with a reference NOES motor. The comparison is made using a FEA-2D numerical calculation taking into consideration GOES saturation and anisotropy.