To realize the brush-less operation for wound field vernier machines (WFVMs), a novel self-excited topology is proposed in this paper which involves four-pole main armature winding and two-pole excitation connected series using an uncontrolled rectifier. Upon supplying current from single current-controlled voltage source inverter (VSI), procedure results magnetomotive force (MMF) components ai...

power system overvoltages due to switching, lightning and other disturbances are the main problem for designers of the power transformers. once some frequencies of the incoming surges match with some of the natural frequencies of transformer winding, the resonance phenomenon is expected in transformer winding. the resonant overvoltages may destroy the insulation between turns and cause to insul...

In this paper, a brushless wound rotor vernier machine (Bl-WRVM) with single inverter configuration is proposed to achieve the operation. topology, connected series-connected ABC and XYZ windings through which current flow produces magnetomotive force fundamental sub-harmonic components, respectively. The have similar pole pairs excitation windings, whereas its number of poles different from wi...

This paper describes a consideration of the excitation circuit of a switched reluctance generator (SRG). The SRG is a doubly salient machine. It does not contain any magnets or brushes, and the phases are completely independent. The rotor is made of laminated iron and it does not have any winding. However, the conventional excitation circuit of this machine is an asymmetry half bridge converter...

The analysis of saturated machines is generally performed with the stator and rotor currents, or mixed combinations of currents and flux linkages as state variables were also taken into account. A synthesis of possible models of induction machines is presented. Possible models contain explicit terms that describe cross-saturation except for the winding flux model. This paper treats the impact o...

In this paper, the steady-state temperature of a sample 500 KW two rotor one stator Non-slotted axial flux permanent magnet motor is calculated using the finite element simulator software package. Due to the high temperature in various parts of the machine, especially at stator winding, a cooling system is designed for the motor and the temperature is recalculated. The results show that the tem...

In many spheres of human activities devices that work on increased frequency current are widely applied. 50 Hz current can be converted into increased frequency (100-400 Hz) current using synchronous reactive converters, which are based on exude and usage of higher harmonics. The goal of this paper is to determine which circumstances must be taken into account to ensure highest increased freque...

Brushless DC Motors have a permanent magnet rotor and the stator winding are wound such that the back electromotive force (EMF) is trapezoidal. The motor posses high Torque/weight ratio, operate at very high speed, very compact & electronically controlled. In this paper, we have to use three algorithms ZN, GA & PSO respectively. On the basis of performance of these three techniques, PSO have hi...

Abstract: Quality assessment during dc motor manufacturing should be accomplished by quality controls in order to detect the different fault conditions associated to the components included in the machine. However, some defects can be produced by the automatic manufacturing process during the assembly of the individual components. Among others, inter-turns short-circuit, turn to earth short-cir...

A novel technique to estimate and model parameters of a 460-MVA large steam turbine generator from operating data is presented. First, data from small excitation disturbances are used to estimate linear model armature circuit and field winding parameters of the machine. Subsequently, for each set of steady state operating data, saturable inductances and are identified and modeled using nonlinea...