Improved current regulators for IPM machine drives using on-line parameter estimation

Current regulators for interior permanent magnet machines have unique challenges if high performance torque regulation is to be achieved. This paper presents a novel approach for fully decoupling the problematic cross-coupling with estimated parameters from online self-tuning. In the on-line estimation algorithm, the model is formulated such that cross-coupled estimated parameters are eliminated, which improves the parameter estimation robustness. Parameter estimation is further improved by combining the model with a closed loop observer. Cross-coupling terms can then be decoupled using estimated parameters to improve the performance of the current regulator.