Core loss analysis of high speed motor by using vector magnetic characteristic

In order to design a high-efficiency motor, the iron loss that is generated in the motor core should be reduced. In this paper, the usefulness of the electrical steel sheet of 0.08 mm thickness as the motor core for a high speed motor is shown by using the magnetic measurement and the magnetic field analysis. The measured results show iron loss distributions by using thermography camera. This method has been applied to the surface mounted permanent magnet (PM) motors, which are removed stator windings, to measure temperature distributions on the stator surface during the PM rotor is rotating. When the revolution of motor becomes higher, the iron loss usually increases in a stator core due to the increase of eddy current. However, the core loss in the stator core with 0.08 mm thickness sheet under high evolutions slightly increases in comparison with 0.35mm thickness sheet.