Analysis of a position estimation strategy using a multiple-coupled circuits model of the induction motor

A method for the analysis of a position estimation strategy for induction motors is presented. A model of multiple-coupled circuits, whose parameters are calculated from the winding geometry and distribution, is used for the analysis. The analyzed estimation strategy is based on the variation of the inductance between stator windings and rotor bars. The rotor position is obtained from the effect produced by inductance variation in the zero sequence voltage, exciting the motor with a predefined inverter-switching pattern. As an example, the analysis of the effect of skew on the estimation position signals is presented. Experimental results that validate the proposal are shown.