BEARING CURRENTS OF DRIVING MACHINES IN DRIVES WITH SEMICONDUCTOR TRANSFORMERS
DOI:
https://doi.org/10.14529/power160311Keywords:
bearing current, electric drive, electric motor, semiconductor converter, energy compatibilityAbstract
A common problem of electric drives with semiconductor converters is an accelerated wear of the drive
motor bearing units. This wear is caused by generation of bearing currents in the drive motor, which can have
a continuous or permanent impact on the bearing assemblies.
The authors of this paper have analyzed the causes of bearing currents at driving machines of modern elec-
tric drives. The main types of bearing currents have been identified and described including their characteristics.
We provide description of the main negative impact, long and short-term consequences of bearing current im-
pact. The basic methods of measurement and control of bearing currents are provided, too. The paper offers
means of minimizing bearing currents, analysis of their effectiveness, recommendations for their implementa-
tion at modern electric drives. It concerns the main international regulations specifying permissible values of
bearing currents and preventive methods. The authors offer recommendations on development of this specific
national regulatory framework.
Further studies of bearing currents generated at semiconductor drive motors with frequency converters
will be connected with mathematical models simulating their generation dependent on operation modes of
the autonomous inverter, motor, ground circuit, with their simulation analysis as well as with algorithmic me-
thods aimed at their elimination.
Keywords: bearing current, electric drive, electric motor, semiconductor converter, energy compatibility
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