A Unified Framework for Quantifying Magnetization State in Variable Flux Memory Motors
This paper addresses the lack of standardized metrics for characterizing magnetization state (MS) in variable flux memory motors that use Low Coercive Force (LCF) magnets. Four MS definitions are proposed — two grounded in intrinsic material properties (magnetic flux density B and magnetic polarization J) and two in motor-level observables (fundamental flux linkage and back-EMF components) — evaluated across the full id/iq operating plane via finite element analysis. The study targets interior PMSMs with hybrid magnet configurations (LCF + HCF), bridging the gap between material characterization and practical control or monitoring applications. The framework provides application-specific guidance: material analysis, control implementation, and condition monitoring each call for different MS metrics.