TY - JOUR N2 - Contemporary sensorless AC drives require the use of electromechanical quantities estimation. The skin effect occurring in AC machines with solid secondary or with solid secondary elements causes machines of this type to be represented by equivalent circuits containing distributed elements, which makes the analysis of machine electrodynamic states more complicated and hinders the construction of relatively simple and effective estimators of electromechanical quantities. The variability of rotor parameters is modelled, with a good approximation, by the machine secondary multi-loop equivalent circuit with lumped elements. In this paper the construction procedure of electromechanical state variable estimators basing on this type of equivalent circuit will be presented. The simulation investigations of the created electromechanical quantities estimators, performed for the selected states of solid iron rotor AC machine operation will be shown as well. L1 - http://czasopisma.pan.pl/Content/84918/PDF/02_paper.pdf L2 - http://czasopisma.pan.pl/Content/84918 PY - 2014 IS - No 2 June EP - 160 DO - 10.2478/aee-2014-0012 KW - electrical machines KW - induction motor KW - sensorless control KW - estimation A1 - Kaplon, A. A1 - Utrata, G. A1 - Rolek, J. PB - Polish Academy of Sciences VL - vol. 63 DA - 2014 T1 - Estimators of induction motor electromechanical quantities built on the basis of a machine secondary multi-loop equivalent circuit SP - 149 UR - http://czasopisma.pan.pl/dlibra/publication/edition/84918 T2 - Archives of Electrical Engineering ER -