Loss Analysis of Permanent Magnet Synchronous Motor System Based on Strategy-Circuit-Field Co-Simulation and an Accurate Iron Loss Calculation Method

With the development of permanent magnet synchronous motors (PMSMs), the accurate loss calculation is of vital significance for the performance evaluation of the PMSM system. As the loss of the PMSM system is determined by the control strategy, inverter, and the motor itself, which interact with each other mutually and complicatedly, in conventional loss calculation methods they are not considered synthetically. To calculate the PMSM system loss accurately, this paper proposes a strategy-circuit-field co-simulation methodology, which can take into account the mutual influence of control strategy, inverter, and motor. The proposed co-simulation platform synchronizes the control theory-based strategy simulation, Kirchhoff's law-based circuit simulation, and the field-based motor simulation, which reveals the real physical process of PMSM systems. To further improve the loss calculation accuracy, a hysteresis-based iron loss calculation method is introduced and utilized. The co-simulation results show that the proposed method can reflect the behavior of the PMSM system more physically, and mutual influence between the three aspects can be presented. Finally, the corresponding experiments are conducted, and the results are compared with the simulation results, proving the proposed methodology's feasibility and effectiveness.