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A method for detection of eccentricity in permanent magnet machines

This paper attempts to find an analytical solution for the problem of eccentricity in permanent magnet (PM) machines. The result is helpful in developing proper features in the detection of this kind of fault in a diagnostic package. The analysis starts with the modeling of air-gap eccentricity in PM machines and is supported with both experimental and finite element simulation results. The results show that eccentricity appears in the form of speed related harmonics and can be detected by variation in its second harmonics.