Variable motor operating point by integration of power electronic device into rotor

The main issue of this work is to analyze and to test how the characteristic curve of the induction machine can be adjusted by the power electronic devices, when these are integrated into rotor circuits. In order to technically analyze the characteristic performances of the induction machine by switching between cages, the simulator software´s MATLAB and NETASIM have been used. The simulated current- and torque-waveforms are compared with the experimental values from the test bench. To practical validation of the results, a main feed induction machine with working-cage controller has been designed and tested at the Institute of Electrical Power Engineering in Clausthal, Germany.