Bearing Currents in Induction Motor Drives

Jarosław GUZINSKI, Krzysztof LUKSZA

Abstract

The paper presents problems appearing in electrical drive systems with induction motors supplied from voltage inverters. Attention was drawn to the increasing number of motor faults in converter drives. The causes resulting from the nature of the converter power supply are indicated. The main attention was paid to the bearing current, which is responsible for the majority of machine faults. Types of bearing currents are presented as well as an introduction to explaining the physical phenomena. The methods of protecting motors against bearing currents were listed. An exemplary solution of the zero-component flter is presented.

Keywords

voltage inverter, induction motor, bearing current, common mode flter

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