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

Volume

3

Issue

6

fYear

1997

Firstpage

21

Lastpage

32

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;

fLanguage

English

Journal_Title

Industry Applications Magazine, IEEE

Publisher

ieee

ISSN

1077-2618

Type

jour

DOI

10.1109/2943.628116

Filename

628116