Stator-Flux-Oriented Control of Synchronous Motors: Design and Implementation

This paper deals with a stator-flux-oriented control method for permanent-magnet (PM) synchronous motors and synchronous reluctance motors (SyRMs). The stator-flux magnitude and the torque-producing current component are the controlled variables. This choice simplifies the references calculation (as compared to the current control in rotor coordinates), but the dynamics seen by the inner control loops become nonlinear and coupled, potentially compromising the control performance. We propose an exact input-output feedback linearization structure and a systematic design procedure for the stator-flux-oriented control method. Simulation and experimental results are presented to verify the dynamic performance of the designed controller using a 6.7-kW SyRM drive.