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M. Schrödl, M. Hofer, W. Staffler:
"Online Parameter Tuning of Stator Resistance and Stator Inductance in Sensorless Controlled PMSM-Machines at Low Speed";
Talk: International Conference on Power Electronics and Intelligent Motion (PCIM), Nürnberg; 2007-05-22 - 2007-05-24; in: "Official Proceedings of the International Conference", (2007), 1 - 6.

The paper describes a parameter tuning algorithm of stator resistance and stator inductance at low speed for sensorless control of PMSM-machines. Therefore a combination of INFORM-method and EMF-model is used. The reference position of the permanent magnet flux is calculated by INFORM-method and observer at low speed. The EMF-model uses a weak stabilizing feedback integration. By transformation of the voltage equation into a current-oriented reference frame, the errors of used parameters resistance and inductance can be decoupled and hence, successfully calculated separately. First the mathematical model is examined by a simulation with MATLAB Simulink. The implementation of the model in a practical environment gives information about the actual function, as well as error and influences of noise. Finally a comparison of the simulation results and the practical measurements is shown.