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C. Kral, R. Wieser, F. Pirker, M. Schagginger:
"The Vienna Induction Machine Monitoring Method; A Structural Analysis of a Faulty Machine Behavior";
Poster: PCIM, Nürnberg, Germany; 1998-05-01; in: "Power, Electronics, Automation, Motion, Drives and Control, Power Quality", (1998), 1.

Rotor cage asymmetries cause disturbances of the flux pattern in induction machines. These nonuniform magnetic fields affect machine torque and stator terminal quantities and are thus detectable by monitoring systems. However, the impact of minor machine asymmetries on the overall machine behavior is quite small. The separation of the fault specific signals out of commonly distorted measurement quantities is a challenging task. In order to schedule, maintenance faults should be detected in an early state of growth. Thus, any monitoring method should be very sensitive. The proposed Vienna Method fulfills both excellent noise immunity and high sensitivity. For an inverter fed induction machine, experimental results will be compared with a computer simulation. The torque deviations, calculated by the online models, are investigated in dependence of a single rotor bar resistance increase. Computer simulation allows the analysis of the faulty machine behavior at a stiff voltage supply. These results will be compared with an inverter fed drive, demonstrating the applicability of the Vienna Method at any machine supply source.