A Study of Passive Control in a Bridge Configured Winding Induction Motor with an Oval-Shaped Stator

Previous works have experimentally demonstrated that Bridge Configured Winding (BCW) suppresses unbalanced magnetic pull (UMP) in electrical machines with offset rotor. This work attempts to evaluate BCW’s passive control ability in the mitigation of UMP in a cage motor with an oval stator. The simulations were performed on a four-pole cage induction motor with an oval stator by assuming that the rotor and the stator are concentric. A time-stepping FEM code developed in MATLAB platform has been used for the study. Different degrees of ovality in the stator have been considered to study the influence of BCW in reducing UMP. Fast Fourier transform analysis has been used to predict the identifiable frequency components of UMP in the asymmetric air gap.