LAUSR

Development trends of electric motors including automotive applications are focusing at high-precision, high-efficiency, highperformance, small size, and light weight. In all electric machines, temperature rise has a main role in limitation of size and performance. The temperature rise changes the material characteristics used in the electric machines to deteriorate the performance and affect machine size. High performance, high-efficiency, and size reduction of the electric machines can be achieved by reduction of heat source. High-grade permanent magnet, rare-earth permanent magnet, and low-loss electric steel is able to reduce the heat source. This paper shows the influence of magnetic materials on the electric motors and the characteristics of the magnetic material required in electric motors.