Desgaste prematuro e falhas recorrentes dos rolamentos de um MIT: Estudo de caso

This paper provides an analysis about early incipient faults in three-phase induction motor bearings when driven by inverters, focusing on a real industrial case. The preliminarily defined potential faults were firstly discussed on a theoretical basis afterwards being experimentally assessed by means of vibration, stator current and common mode current data acquisition and analysis. Following the investigation, it was concluded that the presence of common mode currents at the verified levels can cause damages to motor bearings. This result could be confirmed when the machine stopped working due to another failure of the bearings.