Achieving high efficiency and high torque is an important target in EV motors. This\npaper describes the effect of the magnetic properties of electrical steels used as core materials for\nsynchronous motors with permanent magnets, which are commonly used as the EV traction motors.\nIt was confirmed that electrical steels, which have high flux density and low iron loss properties\ncan realize high motor efficiency and torque. When PWM excitation is considered, thinner electrical\nsteels are advantageous to suppress increased loss due to higher harmonics. Based on these results,\nelectrical steels having high flux densities and low iron losses at high frequencies were developed.
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