Accurate digital current control of the reluctance synchronous machine with constant current angle

Constant current angle controlled reluctance synchronous machine drives can be considered as near optimum efficiency controlled drives. This paper describes an accurate constant current-angle current-control technique for a digital controlled reluctance synchronous machine (RSM) drive. Using finite element calculated results accurate decoupled dq current regulators are designed and used in a digital controlled system using the TMS320F240-DSP. In the design of the controller the effect of dynamic inductances, due to saturation and cross magnetisation, on the performance of the PI-controllers is taken into account. Complete analysis, digital simulation and measured results are presented.