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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.

Finite element analysis of dual stator winding line start permanent magnet synchronous motor

Tola Omokhafe James, Obe Emeka Simon, Obe Chinedu Titus, Anih Linus Uchechukwu

Przegląd Elektrotechniczny

2022

R. 98, nr 4

47--52

This paper presents the analysis of dual stator winding line-start permanent magnet synchronous motor (PMSM) developed using finite element analysis (FEA) software suitable for comparison to the conventional line-start PMSM. A three-phase, 4 poles, 36 slots double layer interior permanent magnet (IPM) motor was characterised and its winding structure reconfigured into the dual stator winding with the same capacity and power rating as the conventional motor. The starting, synchronisation capability and the developed torque were compared. The results showed that the DSWPMSM synchronised at 0.20s and operated on a steady speed of 1500rpm.

W artykule przedstawiono analizę silnika synchronicznego z magnesami trwałymi (PMSM) z podwójnym uzwojeniem uzwojenia, opracowanego przy użyciu oprogramowania do analizy elementów skończonych (FEA), odpowiednią do porównania z konwencjonalnym PMSM o rozruchu liniowym. Scharakteryzowano trójfazowy, 4 biegunowy, 36 żłobkowy dwuwarstwowy silnik z wewnętrznym magnesem trwałym (IPM) i przekonfigurowano jego strukturę uzwojenia na uzwojenie z podwójnym stojanem o tej samej pojemności i mocy znamionowej, co silnik konwencjonalny. Porównano zdolność rozruchową, synchronizacyjną i opracowany moment obrotowy. Wyniki pokazały, że DSWPMSM synchronizował się w 0,20 s i działał ze stałą prędkością 1500 obr./min.