Calculations of capacitive couplings in induction generators to analyse shaft voltage

This study deals with the analysis of the parameters that are effective in shaft voltage generation of induction generators. It focuses on different parasitic capacitive couplings by mathematical equations, finite-element simulations and experiments. The effects of different design parameters have been studied on proposed capacitances and resultant shaft voltage. Some parameters can change proposed capacitive coupling such as stator slot tooth, the gap between slot tooth and winding and the height of the slot tooth, as well as the air gap between the rotor and the stator. This analysis can be used in a primary stage of a generator design to reduce motor shaft voltage and to avoid additional costs of resultant bearing current mitigation.