Experimental Identification of IPMSM Flux-Linkage Considering Spatial Harmonics for High-Accuracy Simulation of IPMSM Drives

This paper proposes an identification scheme of interior permanent-magnet synchronous motor (IPMSM) flux-linkage through experimental tests considering the magnetic saturation and spatial harmonics. In proposed scheme, flux-linkage is identified based on the voltage equation of IPMSM. The electro-motive force in rotor reference frame is obtained in real time by applying discrete Fourier transform on the voltage reference of proportional integral and resonant current controller, with precise compensation of the time delay from digital control and PWM on fundamental and harmonic components. The effect of the inverter nonlinearity is compensated using experimentally obtained look up table. Simulation model is constructed using the identified flux-linkage map. The effectiveness of the proposed flux-linkage identification scheme in simulating IPMSM control algorithms is verified through the comparison of simulation and experimental results.