Parameter Estimation of Multiphase Induction Machines with Inter-Plane Cross Saturation: Analysis and Improvement

This paper analyzes the sensitivity of the rotor parameter estimation of an advanced
$\Gamma-\mathbf{model}$
for multiphase induction machine. These machines exhibit inter-plane cross saturation and certain sub-topologies, such as variable phase-pole machines, may operate briefly with high rotor frequencies, which warrants the use of such models. It is shown that accurate non-linearity compensation of the voltage vector and characterization of the drive's input/output-delays is paramount for the rotor parameter estimation. Moreover, standstill experiments using a simple inverter excitation signal are designed to improve on the offline parameter estimation by means of a prediction error method. The presented method may find usage in (self-) commissioning of multiphase induction machines.