Analysis and Modeling of Switching Surges in PMSM Drives Due to Eddy-Current Reaction

In this article, the phenomena of switching surges due to eddy-current reaction are investigated and analyzed for permanent-magnet synchronous motor (PMSM) drives. With vector magnetic circuit (VMC) theory, a new three-phase PMSM model is proposed, where the differential terms of stator voltages are included for considering the transient eddy-current reaction. In this way, the cause of switching surges in PMSM drives is revealed to be the switching actions of power devices in power converters. Furthermore, the switching surges have been evaluated quantitatively by modeling the eddy-current reaction by a transient magnetic coefficient in the magnetic circuit, and the impact factors have been analyzed. The model predictive control (MPC) scheme is employed as an application case for evaluating the proposed PMSM model considering switching surges. Experimental results have been given to verify that the proposed modeling method can present improved current prediction accuracy and control performance at various conditions than the existing methods even when the disturbance observer is employed.