Analytical Prediction of the MCSA Signatures Under Dynamic Eccentricity in PM Machines With Concentrated Non-Overlapping Windings

Current Signature Modeling of Surface-Mounted PMSM Drives With Current Sensors Faults

“…As regards the choice of n, i.e. the number of terms to be considered for the analytical determination of the currents i d and i q expressed by (19), it should be noted that if the two PI controllers are the same (k pd = k pq ; k id = k iq ) the exact solution of equations ( 17) is obtained for n = 2, i.e. the dq current components contain only the first two harmonics, having angular frequency pω r and 2pω r , respectively.…”

“…In the most general case, i.e. when k pd = k pq ; k id = k iq , the solution of (38) is better approximated as greater is the value of n in (19). The degree of approximation of the solution x * found for a given value of n is just given by the value of the sum of squared residuals ϕ(x * ) defined by (34).…”

“…They have approached mainly the detection of open phase fault [6], [7], stator winding inter-turn short circuit [8]- [12], rotor demagnetization [13]- [15], air gap eccentricity [16]- [19]. Obviously, to apply these methods effectively, it is essential to know the effects of faults on the stator current spectrum.…”