Dynamic Jiles–Atherton Model for Determining the Magnetic Power Loss at High Frequency in Permanent Magnet Machines

This paper describes a mathematical model for the dynamic magnetic power losses in the laminated steel stator of high-frequency permanent magnet machines, such as brushless dc (BLDC) motors. The model presented is based on a utilization of the dynamic Jiles-Atherton model. Accurate dynamic B-H curve fitting and magnetic power loss derivations have been achieved, where the calculated magnetic losses have shown ~95% accuracy from 5 to 2000 Hz over a flux density range of 1.0-1.6 T. This approach has been applied to estimate the magnetic power loss of a small scale high-frequency (>10 000 r/min) BLDC motor, with calculated and measured losses being in close agreement.