Small Signal Model of Mutually Coupled Switched Reluctance Motors Based on Net Flux Method

Abstract

In this work, a small signal model is developed for Mutually Coupled Switched Reluctance Machines (MCSRMs) based on Net Flux Method (NFM) that facilitates the development of the motor current controller utilizing established controller development resources. This method expedites the modeling, as well as the controller process as separate calculations of the self and mutual flux as a function of rotor position and phase currents are not required. Using NFM, the MCSRM can be represented in terms of a single net phase incremental inductance which further simplifies the controller design procedure. The modeling is complemented with the complete design procedure of a proportional-integrator (PI) controller. Dynamic simulations of a 3 phase, 1 HP, tooth wound, MCSRM drive system is carried out in Matlab and Simulink and results are presented. A prototype of a 150 W, fully pitched MCSRM has been built and preliminary experimental results are presented.