Generalised Analytic API-Roach for Multiphase Thyristor DC Choppers Driving Separately Excited Motor

A general procedure to predetermine the behavior of an n-phase chopper-motor system is presented. The approach is based on the concept that an n-phase chopper is basically a multi-input multi-output system for which vector equation of the form X = ΛX + BŪ exists. Solution of this equation, satisfying the boundary conditions, predetermines the behavior of the system. For balanced operating condition and continuous conduction mode closed-form solution has been obtained for phase and load currents.