Review and Prospect of Air-gap Eccentricity Faults in Induction Machines
Bao Xiao-hua · Proceedings of the CSEE · 2013
Induction motors are widely used in a variety of fields,and the mechanical failures are mostly related to air-gap eccentricity.A survey on the research of air-gap eccentricity in induction motors is given in the paper.Detection of air-gap eccentricity based on motor current signature analysis is described in detail,including the mathematical model used in theoretical analysis.Some important conclusions about static eccentricity,dynamic eccentricity,mixed eccentricity and inclined eccentricity are given in this paper.Then a brief introduction of unbalanced magnetic pull and vibration caused by eccentricity is presented,including the calculation of unbalanced magnetic pull and vibration signal analysis.Finally,the future research prospect of air-gap eccentricity faults is discussed based on the current problems and deficiencies.Fault diagnosis and eccentricity restriction are thought to be the developing direction.And curved dynamic eccentricity which is more precise is proposed in this paper.