Control of Synchronous Machine Drives

Abstract

This chapter deals with field-oriented, model based control of synchronous machines. Field-oriented control has become common choice for many servo drive applications due to the availability of accurate models and affordable digital signal processors (DSPs) that execute the model based control algorithms in real time. This chapter builds on the machine models introduced in the previous chapter and extends the electromagnetic torque control principle introduced in Sect. 4.2.1. Controls are derived for both non-salient and salient synchronous machines. The operation in field weakening with constant stator flux linkage and with unity power factor is analyzed. At the end of the chapter, the controls are interfaced with a current-controlled and a voltage-controlled converter. A set of tutorials is provided to interactively illustrate the concepts and the proposed control strategies.