Infinite speed drives control with MTPA and MTPV for interior permanent magnet synchronous motor

The paper presents infinite speed drives with both maximum torque per amp control and maximum torque per volt control for interior permanent magnet synchronous motor. The presented method controls infinite speed drives MTPA before flux weakening occurs. As the speed goes up further to flux weakening region II, maximum torque per volt control is achieved to give more output torque. Moreover, smooth and automatic transition among constant torque control with MTPA, flux weakening control in region I and flux weakening with MTPV control in region II are achieved by the presented control method. All of these control approaches are under vector control. Experimental results are derived from a DSP-based controlled infinite speed drives. The specifications of the IPMSM include 750 W, 3000 rpm and 4 poles. Experimental results show the presented control method can achieve both MTPA and MTPV control to fully support the theoretical development.