C. Kral:
"The Behavior of an Inverter Fed Squirrel Cage Induction Machine with Faulty Rotor Bars";
Talk: PCIM, Nürnberg; 06-01-1999; in: "Conference Proceedings PCIM", (1999), 1.

A squirrel cage induction machine with faulty rotor bars can be seized by a simplified machine model, based on space phasor theory. The required machine model will be noticed in the rotor fixed reference frame. A faulty rotor bar can be considered by means of different rotor resistance and reactance values for the d- and q-axis. The rotor fixed machine equations can be solved for steady state operation by means of positive and negative sequence space phasors. There the basic influence of rotor asymmetries can be determined. The fault related disturbances of the rotor current and flux space phasor will be derived for an direct field oriented torque control structure. In this case machine currents can be seen as injected quantities. For infinite mass moment of inertia, this analysis allows the estimation of the expected torque modulation and the influence of the stator terminal voltages. The aim of this paper is the estimation of the major influences of a faulty rotor for an inverter fed induction machine. The introduced space phasor model allows the investigation of the machine behavior without a numerical simulation in the time domain. The theoretical analysis will be compared with measurement results.