Design, Control, and Experimental Test of an Open-Winding IPM Synchronous Motor

A concentrated winding interior permanent-magnet synchronous motor (IPMSM) capable of being used in wide speed range applications is designed and introduced. The IPMSM in the study is capable of being operated either from a single supply or from two converters in an open winding configuration. In this study, the phase windings are open connected to two separate voltage source converters: a dc-supplied main bridge, capable or supply real and reactive power, and a floating bridge (FB), connected to a capacitor and only capable of supplying reactive power to the motor. Vector diagram analysis and two-dimensional finite-element analysis (FEA) are presented to illustrate the extension of the capabilities of the IPMSM compared to the usual Y connection. The open winding IPMSM is built and performance experimentally investigated over a wide range of speeds. The results demonstrate 10-15% higher power capability using an open winding and FB, compared to the single inverter drive by experiments.