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This paper computes, using 2D FEM analysis, the copper and iron losses of a Permanent Magnet Synchronous generator (PMSG) supplying a three phase single switch boost rectifier. The whole system consists of the generator, the coupling converter and a PI controller. An open loop and a close loop PWM control has been implemented and both the iron and copper losses are investigated for the two control...
This paper realizes a study of the influence of specific rotor design parameters on the permanent magnet synchronous machine (PMSM) electromagnetic behavior. The study is carried out in a FEM analysis environment. Four permanent magnet synchronous machines with the same stator and different rotor topologies have been simulated and their electromagnetic characteristics are compared to each other. The...
This paper investigates a surface inset-permanent magnet brushless DC motor with fractional-slot winding configuration driven by a three-phase inverter under different types of defected magnets. The comparative study on demagnetization faults is carried out using FEM analysis. The number of damaged magnets, their relative position in the rotor surface and their demagnetization level are studied for...
It has been noted that, in the induction motor the mechanical load oscillations can produce stator current spectrum harmonics, similar to the ones of the broken bar fault. As a consequence, these two different conditions have to be reliably distinguished. This paper proposes a new method aiming to this direction. More specifically, it is proposed to monitor the inherent eccentricity harmonics and...
It has been reported that the only-static and only-dynamic eccentricity cannot be reliably detected in induction motors which produce Principal Slot Harmonics (PSH) with the use of the traditional MCSA method. Most work was focused in the detection of dynamic and mixed, rather than static eccentricity. In this paper, the detection of the only-static eccentricity fault in Δ-connected induction motors...
The diagnosis of faults in induction motors is a crucial scientific subject since it affects the industrial production functionality and reliability. Lately, a new scientific area is born: the electrical machines prognostics. So, aiming to this direction the complete knowledge of all abnormal parameters during the induction motor operation should be identified. In this paper, a methodology is described...
This paper analyzes the way the different number of short-circuited turns during an inter-turn stator fault affects the functional behavior of a salient pole synchronous machine, while this is connected to an infinite bus. In order to achieve more accurate results, two subcases have been examined. In the first one, different number of turns belonging to the same phase is short-circuited, while in...
In this paper an investigation of the synchronous machine behavior during a field short-circuit as the generator is connected to the 50 Hz grid is presented. The behavior analysis has been carried out using the Finite Element Method (FEM) for two cases. In the first one the rotor speed is held constant and equal to the synchronous one, while in the second case the rotor speed is controlled by a PI-controller...
This paper presents an investigation of transient phenomena of a Salient Poles Synchronous Machine connected to an infinite bus, focusing on the currents of the damper bars, the electromagnetic torque oscillation and the stator currents, during two kinds of short-circuits: (a) an inter-turn in the stator of the synchronous machine between two conductors of different phases and (b) between two conductors...
During the transient operation of a synchronous generator, a lot of variations in the operation of the machine appear, which are unavoidable and can cause significant oscillations of the load angle θ and the electromagnetic torque. These oscillations can lead the generator to pole slipping. A fault, which is possible to occur, is a short-circuit at the supply of the excitation system of the synchronous...
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