Monitoring and Damping UMP Due Eccentricity Fault in Induction Machines: A Review

Abstract

Three-phase induction machines are reliable and widely used in industrial plants. Efficient condition monitoring can diagnose the inception of fault mechanisms in induction motors thus avoiding failure and expensive repairs. Therefore, there is a strong need to develop a more efficient condition monitoring. The main target is to achieve a relatively low cost and/or non-invasive system which is still powerful in terms of monitoring for online detection of developing faults. In order to reduce the unbalanced magnetic pull (UMP) in case of an eccentric rotor, the eccentricity-generated additional airgap flux waves should be reduced. The present paper addresses rotor eccentricity faults and studies conventional monitoring techniques for induction motors. The radial forces in an induction motor are calculated. In addition, the characteristics of UMP in induction machines are stated.