Abstract :
During recent years, an increase in bearing failures has been seen in ASD-fed electric motors, as well as in gearboxes, and other connected machinery, caused by electric current flow through such bearings. The theories presented in this paper focus on bearing currents in ASDs of the voltage source pulse width modulated (PWM) type, for use with AC induction motors, although the concepts are applicable to various types AC and DC drive systems
Keywords :
DC-AC power convertors; PWM invertors; failure analysis; induction motor drives; machine bearings; reliability; variable speed drives; ASD systems; bearing failures; electric bearing currents minimisation; induction motor drive; voltage source PWM invertors; AC motors; Induction motors; Manufacturing automation; National electric code; Pulse width modulation; Pulsed power supplies; Shafts; Space vector pulse width modulation; Variable speed drives; Voltage;
