Title :
Calculation of Circulating Bearing Currents in Machines of Inverter-Based Drive Systems
Author :
Muetze, Annette ; Binder, Andreas
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI
fDate :
4/1/2007 12:00:00 AM
Abstract :
The high-frequency circulating bearing current that may occur in machines of inverter-based drive systems can be described by an eddy-current model. The parameters of an equivalent circuit are derived from the model. The ratio between bearing current and common-mode current amplitudes for different machines is calculated. The theoretical maximum ratio is about 0.35. Copper loops applied for bearing current measurement may decrease the circulating bearing currents up to almost 40%
Keywords :
eddy currents; electric current measurement; variable speed drives; bearing current calculation; common-mode current; eddy-current model; inverter-based drive systems; Current measurement; Equivalent circuits; Induction motors; Inverters; Lamination; Magnetic flux; Magnetic separation; Shafts; Stator windings; Voltage; Common-mode voltage; inverter-induced circulating bearing currents; variable-speed drives;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2007.892001
