Novel Current Injection Based Multi-Parameter Estimation Technique for Dual Three-Phase PMSMs

This paper investigates a novel current injection-based multi-parameter estimation technique for dual three-phase permanent magnet synchronous machine (PMSM) considering the magnetic saturation and temperature effects simultaneously. One set of currents is injected in harmonic subspace, which does not interfere with average torque production in the fundamental subspace to obtain the stator resistance under different temperature conditions. For each injection operation, the temperature effects on the resistance and permanent magnet flux linkage are considered and modelled. Meanwhile, this proposed method employs high order polynomial surface to fit the self-and cross-saturation effects. The analytical model achieved from the proposed estimation scheme satisfies both the light and heavy saturation regions. The proposed approach is validated through experimental studies on a laboratory dual three-phase interior PMSM.