Inverter-fed linear asynchronous machine

The behaviors of an arc-shaped stator induction machine (the sector-motor) and a disc-secondary linear induction motor are analyzed in this work for different values of frequency. Variable frequency is produced by a voltage source controlled-current inverter which keeps constant the RMS value of the phase current, also assuring a sinusoidal waveform. For the simulations of the machine developed thrust, an equivalent circuit is used. It is obtained through the application of the one-dimensional theory to the machine modeling. The circuit parameters take into account the end effects, always present is these kinds of machines. The phase current waveforms are analyzed for their harmonic content. Experimental measurements were carried out in the laboratory and are presented with the simulations, for comparison purposes.