Stator circulating currents as media of fault detection in synchronous motors

Evaluation of different monitoring parameters for synchronous machine fault diagnostics

“…(7) and (8) form the basic system of equation for a time-stepping formulation. FEM models were successfully used in the past to generate virtual data of healthy and faulty SMs [12,22]. For the present work, an in-house FEM software was used to model the SM; the electrical parameters of the machine data are provided in Table 1 below.…”

“…[1] Major faults in SMs occur from inter-turn short circuit of stator or rotor windings, and eccentricity due to nonuniformity in the airgap, broken damper bar, stator-rotor rubbing etc. [4][5][6][7][8][9][10][11][12]. Bearing faults though not quite common in large SMs are matter of importance [13] for high-speed machines.…”

“…The measurements are based on rotor parameters such as field current, airgap flux measurement [4,[9][10][11] or stator parameters such as vibration, stator voltage, current, circulating current, etc. [4,[10][11][12][13]20,21]. Such an approach is always The present investigation is an attempt of enforcing realistic faults into a low voltage (lv) SM [12] and evaluating the efficacy of different fault indicators.…”

“…[4,[10][11][12][13]20,21]. Such an approach is always The present investigation is an attempt of enforcing realistic faults into a low voltage (lv) SM [12] and evaluating the efficacy of different fault indicators. In order to do so, the eccentricity fault of different intensity were created by suitable changeover of customized end-shield (see Fig.…”

“…Zero sequence voltage component was used for simultaneous diagnosis of stator faults arising from inter-turn shorts and resistive unbalance [16]. On the contrary, the sensor-based approach deals with interpretation of the obtained data either by installing new sensors or using the existing ones and often times combined with modelbased approach to offer logical conclusions [9][10][11][12]20,21]. The measurements are based on rotor parameters such as field current, airgap flux measurement [4,[9][10][11] or stator parameters such as vibration, stator voltage, current, circulating current, etc.…”