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Analysis and effect of static eccentricity fault on performance indicators of a synchronous reluctance motor

Idoko Emmanuel, Umoh Gideon David, Obe Pauline Ijeoma, Mama Benjamin Okwudili, Obe Emeka Simon

Archives of Electrical Engineering

2023

Vol. 72, nr 3

829--848

Fault diagnosis and condition monitoring of synchronous machines running under load is a key determinant of their lifespan and performance. Faults such as broken rotor bars, bent shafts and bearing issues lead to eccentricity faults. These faults if not monitored may lead to repair, replacement and unforeseen loss of income. Researchers who attempted to investigate this kind of machine stopped at characterizing and deduced ways, types and effects of rotor eccentricity fault on the machine inductances using the winding function method. A modified closed-form analytical model of an eccentric synchronus reluctance motor (SynRM) is developed here taking into cognizance the machine dimensions and winding distribution for the cases of a healthy and unhealthy SynRM. This paper reports the study the SynRM under static rotor eccentricity using the developed analytical model and firming up the model with finite element method (FEM) solutions. These methods are beneficial as they investigated and presented the influence of the degrees of static eccentricity on the machine performance indicators such as speed, torque and the stator current and assess the extent to which the machine performance will deteriorate when running with and without load. The results show that static eccentricity significantly affects the machine’s performance as the degree of eccentricity increases.

Calculation of squirrel-cage motor inductances including rotor eccentricity

Sołbut A.

Archives of Electrical Engineering

2009

Vol. 58, nr 3-4

157-169

Analitycal dependencies providing inductances calculations of squirrel-cage motor mathematical model including rotor eccentricity (static and dynamic) are presented in the paper. Equations shown in the paper are used for numerical modelling of motor drives with rotor damages. Considerations are supported by simulation test results of an induction motor fed by voltage inverter, controlled by Direct Torque Control method.

W pracy przedstawiono analityczne zależności umożliwiające obliczenia macierzy indukcyjności modelu matematycznego silnika klatkowego z uwzględnieniem uszkodzeń w postaci mimośrodowego osadzenia wału wirnika (mimośród statyczny i dynamiczny). Wyprowadzone zależności wykorzystano do numerycznego modelowania układów napędowych z uwzględnieniem uszkodzeń wirnika. Rozważania poparto wynikami badań symulacyjnych silnika zasilanego z sieci napięciem sinusoidalnym oraz falownika napięcia sterowanego metodą DTC.