Title :
Characteristics of shaft voltage and bearing currents
Author :
Busse, Dave ; Erdman, Jay ; Kerkman, Russ ; Schlegel, Dave ; Skibinski, Gary
Author_Institution :
Rockwell Autom./Allen-Bradley Co., Mequon, WI, USA
Abstract :
This article reviews investigations into reduced bearing life due to voltage source adjustable speed drive (ASD) AC motor operation. Relevant bearing failure mechanisms and indicators are discussed. dv/dt and electric discharge machining (EDM) contributions are discussed and experimental data presented showing the voltage levels on motor shafts when operating with ASDs. Finally, techniques to reduce shaft voltage are discussed, along with the electrical characteristics and interaction of system components. The example chosen is electrostatic shielded induction motors
Keywords :
failure analysis; induction motor drives; machine bearings; variable speed drives; AC motor operation; bearing currents; bearing failure indicators; bearing failure mechanisms; bearing life reduction; electric discharge machining; electrostatic shielded induction motor; shaft voltage; voltage source adjustable speed drive; AC motors; Electric variables; Electrostatics; Failure analysis; Fault location; Induction motors; Machining; Shafts; Variable speed drives; Voltage;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/2943.628116
