Eccentricity in Induction Machines—A Useful Tool for Assessing Its Level

In the condition monitoring of induction machines operating in various industry sectors, assessment eccentricity is as important windings, bearings, mechanical vibrations or noise. The reasons for can be various; example, rotor imbalance, damage wear improper alignment and load machine finally, assembly errors after overhaul. Disregard this phenomenon during routine tests may result development transmitted to stator faster bearings even, extreme cases, rubbing against surface windings local overheating core. On basis years experience diagnosis large industries, article deals with problem developing reliable indicators assessing levels commonly accepted types eccentricity. Starting from field calculations analyzing cases eccentricity, methodology determining evaluation current spectrum shown. changes values these indices simultaneous occurrence static dynamic are calculation results were verified laboratory. Also shown three interesting diagnostic practice high-power industry. It has been that proposed useful enable an accurate