Characteristic of Independent Two AC Motor Drives Fed by a Five-Leg Inverter

This paper presents the experimental test results of the independent vector control characteristics of two three-phase induction motors (IMs) and two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). To drive two motors (IMs or PMSMs) independently, the system connected one motor to one three-phase voltage source inverter (three-VSI) is generally used and is required two three-VSIs. Therefore, twelve and ten-switching devices are necessary in the three-VSIs and FLI respectively. Finally, the FLI can decrease two-switches and will be expected for saving space and reduction of inverter losses. Experimental results are verified for the independent driving characteristics in two motors with the FLI.