Dynamic Modeling for Asymmetric Interior PM Machine with Consideration of Magnetic Saturation and Cross-Coupling Effect

The axis displacement in asymmetric interior permanent magnet (AIPM) machines may cause significant localized magnetic saturation and cross-coupling phenomenon different from the conventional symmetric IPM machines. Therefore, this paper proposes a new dynamic modeling scheme for AIPM machines considering magnetic saturation and cross-coupling effect. A frame transformation is utilized to establish simplified model where the cross-coupling inductance is eliminated through orientation of the maximum reluctance axis. Further, the shifting angle of maximum reluctance axis is obtained and arranged into look-up-table (LUT) in control system to develop dynamic model, which can provide a utility simplified reference under different operation conditions. The effectiveness of the proposed model is verified by the transient performance obtained by the MATLAB/Simulink and JMAG-RT motor model co-simulation.