Online Multiparameter Estimation of IPMSMs Considering Mutual Inductances and Rotor Position Compensation

Accurate comprehensive parameter estimation and analysis are essential for high performance modeling and control strategy of interior permanent magnet synchronous motors (IPMSMs). This article proposes an improved electrical machine (EM) model considering cross coupling effects and rotor position compensation to accurately estimate parameters, including stator winding resistance, inductances and permanent magnet (PM) flux linkage. In this article, the stator winding resistance is estimated separately by decoupling from other unknown parameters through removing common elements, using basic measurements including speed, voltage and current. Furthermore, dq-axis inductances and mutual inductances are investigated and constructed into mapping over various currents through decoupling coefficients in the proposed mathematical model. Meanwhile, rotor position compensation is considered to reduce the effects of rotor position error on parameter estimation. The proposed approach can improve the accuracy of estimation which is validated by the experiment on a laboratory prototype IPMSM and compared with other estimation methods ignoring either mutual inductances or rotor position compensation.