Mitigation of Inverter-Induced Noncirculating Bearing Currents by Introducing Grounded Electrodes into Stator Slot Openings

Modern converter-supplied ac motors are exposed to bearing currents. Despite extensive research and development, the industry still does not have a final solution with acceptable cost high efficiency. This article focuses on capacitive After brief explanation of phenomenon, an unconventional approach for effective mitigation currents is proposed. The suggests using grounded electrodes in slot openings reduce stator-winding-to-rotor-core capacitance thereby Different electrode diameters considered evaluated by finite element method (FEM) analysis. results verified laboratory tests. voltage ratios original modified induction motor compared.