Abstract: In order to increase the power density of traction motor for new energy vehicles, major motor manufacturers have been constantly increasing the motor speed. The following problem that manufacturers have to solve is how to reduce the increasing iron loss when the motor speed is increased. The components and influencing factors of motors’ iron loss were discussed in this paper, and an 8pole 48slot permanent magnet synchronous motor using three different thickness materials was simulated. To compare its efficiency and iron loss distribution, the relationship of the thickness of silicon steel in drive motors, the iron loss and the cost were derived. And finally some recommendations for the selection of drive motor materials were put forward.

Key words: new energy vehicle motor, iron loss, material selection suggestion