Sensor-less control of an Integrated Starter-Alternator with an IPM synchronous machine

This paper describes a sensor-less control strategy for an Integrated Starter-Alternator (ISA) prototype. An improved stator flux observer is developed based on current and voltage models for the estimation of the stator flux linkage. This observer is able to produce accurately-estimated stator flux linkage needed for high performance Direct Torque and Flux Control (DTFC) implementation. The sensor-less DTFC interior permanent magnet synchronous machine drive can fulfill the control specifications for starter-alternator systems.