A Loss Calculation Method of Motor Stator Core Excited by Harmonic Magnetic Field Based on Multiscale Energy Model

The presence of harmonic components in the excitation will increase iron core losses in electrical machines and it is significant to compute core loss accurately for the optimal design of high power density motors. In this paper, a hysteresis model based on the minimization of magnetic domain energy is developed to describe the vector relationship between the magnetization M and magnetic field strength H under harmonic magnetic fields. After that, the stator core loss distribution of an electrical machine is calculated by the integral of dM/dt and H as stated by the Poynting's theorem. The effectiveness of loss calculation method proposed here is also verified by the experimental data.