Accurate Modeling of Variable- Flux PMSMs without Electromagnetic Co-Simulation

This paper presents a new high-fidelity model of Variable-Flux Permanent Magnet Synchronous Machines (VFMs), for control simulation in Simulink without the need of time-consuming co-simulation coupled with Finite Element Analysis (FEA). The proposed motor model is based on precalculated FEA look-up tables (LUT), and describes the VFM behavior accurately, including non-reversible demagnetization and magnetization phases of the motor drive mission. Besides the dq inverse flux linkage maps at different Magnetization States (MS), the proposed model pivots on the new De-Magnetization and Re- Magnetization tables, two additional FEA calculated maps function of id, iq used to update the MS at the next simulation step. All precalculated LUTs are obtained through transient magnetic field analysis in JMAG, using a permanent magnet material with low coercivity and a non linear B- H characteristic. The accuracy of the developed model is demon-strated through comparisons with conventional co-simulation approaches, including direct control circuit simulation in JMAG and simultaneous running of JMAG and Simulink. The results indicate that the proposed model yields high-fidelity results with significantly reduced computational time, particularly for transient operations, thus offering a valuable tool for simulating machine drive systems with VFM technology.