Electric Machines

2

Faults in Induction and Synchronous Motors

Bilal Akin Ph.D.

Texas Instruments

Mina M. Rahimian Ph.D.

Texas A&M University

2.1 Introduction of Induction Motor Fault

This section briefly summarizes motor fault conditions and their cause, especially for the induction motor. The eccentricity related faults, broken rotor bar faults, bearing faults, and stator faults, which account for more than 90% of overall induction motor failures, are considered [1–3].

2.1.1 Bearing Faults

Bearing faults account for more than 40% of all electric motor failures [5–7]. Most of the bearings in industrial facilities run under nonideal conditions and are subject to fatigue, ambient mechanical vibration, overloading, misalignment, contamination, current fluting, ...