Independent Position Controls of Two Permanent Magnet Synchronous Motors Fed by a Five-Leg Inverter

This paper presents the experimental test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). Recently, the use of PMSM is more and more spreading in industrial field. It has the features of saving-weight and high-efficiency compared with DC motor and induction motor. The maximum feature of the PMSMs is the realization of high performance position control. The independent position control validates for the factory automation (FA) apparatus as machine tool. If the independent position control of two motors with the FLI may be realized, the belt conveyer used at the FA apparatus will become possible not only one dimension but also two dimensions without double three-phase voltage source inverters. In this paper, experimental results are verified for the independent position control of two PMSMs fed by the FLI with the vector control. In addition, two PMSMs independent characteristics on condition that one motor operates at speed control and the other PMSM at position control also investigated.