Research of core loss of permanent magnet synchronous motor (PMSM) in AC servo system

Loss leads to motor temperature rise, and then influences the performance of motor material, so as to limit the improvement of motor running performance and lifetime. The characteristics of high reliability, high speed and big torque are required in some special areas, such as aerospacecraft, weapons. Also the high performances attach tightly with the core loss. So the calculation of motor core loss is one important evidence of its research and application. Based on the 2D time-step finite element analysis of the electromagnetic field of the PMSM, which is used in missile actuator system, the loss of the stator is calculated in this paper. The isolation core loss model which divides core loss into hysteresis loss, eddy current loss and additional loss is adopted. The magnetization way of core is analyzed, and the Fourier analysis and orthogronal decomposition are used to deal with the magnetic flux density waveforms. Afterwards, the core loss characteristic of PMSM in AC servo system is researched. Finally, the experimental and calculation results are in the satisfactory agreement, which provides a basis for the core loss calculation of motor in servo system.