General Decoupling Transformation for Simplification of Analysis and Control of Multistator Winding Synchronous Reluctance Motor Drives

Multistator machines are characterized by coupled flux-linkages between group of winding sets, which complicate the analysis and control. Approaches to decouple machine models, such as the vector space decomposition and multistator decoupling for machines with equal pole number and winding turns has been discussed. This paper presents a general decoupling transformation that can be applied to machines with unequal pole number and/or winding turns. The decoupling transformation modularizes the model and simplifies steady-state analysis. The decoupling will also improve the dynamic response of the system due to the independence of current controllers for the respective winding sets. The conditions for maximum torque per ampere in the decoupled model are evaluated and compared with the original qd–models. Different winding configurations of a Triple Three–Phase Synchronous Reluctance Motors are evaluated as case studies.