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The goal of this paper is to evaluate the possibility of deriving a simple lumped electrical model of the additional losses in stand-alone synchronous generators due to unbalanced loading. An in depth analysis will reveal that the additional loss due to unbalanced loading is partially dissipated in the rotor. Because analytical segregation of the individual loss components remains complex due to the...
In the present article, the authors are performing a comparison study between two vortex models for the rapid numerical computation of the static thrust of a helicopter rotor in hover. The aim of this study is to access the rapidity and accuracy of a vortex model, comprised of a series of vortex rings and a single semi-infinite vortex cylinder, compared to a helical wake model with straight-line segmentation...
The results of strength and gas dynamic improvement of turbocharger TK-32 axial turbine are presented. Turbocharger is manufactured by LLC "Penzadieselmash" (Penza, Russian) and used as unit boost for diesel locomotive. The aim of this work was to ensure turbine work capacity when rotor speed is increased by 10% without efficiency reduction. The strain-stress state analysis indicated the...
Salient pole wound field synchronous machines (WFSMs) are widely used for various electric power generation, such as hydro and wind generators [1], because there is free of permanent magnet and it can be directly controlled by the DC winding.
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
Lately, a new diagnostic mean has been introduced for reliable fault diagnosis in delta-connected induction motors. This diagnostic mean is the zero-sequence current frequency spectrum. It will be shown in this paper that, the zero-sequence current waveform can be reliably used for identifying the induction motor's iron core saturation level. So in this work, simulations with the Finite Element Method...
This paper presents a Finite Element Analysis (FEA) of a 24kW six-phase Axial Flux Permanent Magnet Synchronous Machine (6AFPMSM) and its validation through experimental tests for fault tolerant generation purposes. The presented topology contains a high pole number and is suited for wind turbines applications in direct-drive or hybrid one-step geared systems. Simulations with Finite Element Method...
Using ANSYS finite element package, an electromagnetic simulation model is developed for switched reluctance generator (SRG) in which dynamic characteristics are predicted precisely with finite element method (FEM). Carrying out 2D finite element (FE) transient analysis, instantaneous phase current and stator pole flux waveform are predicted when magnetic saturation is considered in the analysis....
In this paper, a fault assessment of a multiphase permanent magnet generator designed for ‘more electric engine’ aeronautic applications is presented. The distribution of various electrical faults occurring in three-phase machines that is available in the literature helped the authors to identify the most probable fault types. The six-phase machine under observation is tested under these faults both...
This paper presents an improved dynamic model with incorporating the saturation effects for an induction motor (IM). The improved model is simulated with MAT-LAB/SIMULINK software for transient response in terms of electromagnetic torque, rotor speed and stator current at no-load and on-load. The obtained simulated results provide a clear evidence that the conventional unsaturated model fails to predict...
This paper deals with the analysis of shaft loaded by magnetic force. The shaft deflection and critical speed are obtained by two methods: Transfer Matrix Method and Finite Element Method. The Finite Element Method is well known, however, the Transfer matrix method not. Therefore, the first section of this paper is focused on the brief introduction to this method. The results obtained by both methods...
The continuous conduction mode operation of switched reluctance (SR) machines yields high utilization of the electromagnetic core. As a result, the power density of an SR machine design can be increased with consideration on this mode of operation. However, the control strategies for the operation of SR machines in continuous conduction mode power generation have not received adequate attention in...
This paper tries to identify the thermal model of a claw pole generator using a method combing finite element method (FEM) with experiment. A finite element model with determined structure and a group of undetermined model parameters is chosen as the object to be refined. With the surface temperature data at different speed and load acquired by thermal imager, the finite element model is iteratively...
Ocean currents offer a green, renewable, and sustainable energy resource which can provide grid-scale power and acceptable capacity factors. Technology to harness these currents is still immature and not well understood. Of major concern are the construction, reliability, and performance of rotors fitted to turbines. The efforts of the collaborative partnership described in this paper are focused...
Finite element method is more precise than the winding function approach, as it is based on the actual geometry of the machine and the machine model can easily be modified in order to study the effect of faults on the machine's performance. Accurate models of the machine under healthy and faulty conditions are developed. This paper presents simulations of broken bars detection in a three phase squirrel...
High-speed permanent magnetic generator (HSPMG) is common and important power production equipment in distributed generation systems. According to the structure characteristics of a 100kW level HSPMG, the mathematical model and physical models for its two-dimensional electromagnetic and thermal analyses are established, and the electromagnetic field of generator working in steady state is calculated...
This paper presents two types of prototype motors for line-starting permanent magnet motors; one is a non-salient- pole machine, and the other is a salient-pole machine. Through both the analyses and the experiments, it is proved that the reluctance torque utility boosts up not only the steady-state characteristics but also the line-starting capability. It is also noteworthy that in the steady-state...
This paper compares the transient response of a finite element salient pole synchronous generator model connected to an infinite network bus to that of a system model based on an equivalent circuit representation of the machine. The characteristics and operating conditions of the two models are made equal as far as possible by thoroughgoing initiation and by using the finite element model for estimation...
Specific electromagnetic actuators are now widely used. In order to meet design constraints in terms of performance and cost, the studies of such converters must be carried out using dedicated models. This paper deals with the study of a permanent magnet actuator with Multiple Degrees of Freedom (MdoF). A first prototype of this device has been built using simplified procedures and presents non negligible...
This paper presents the design process of a high performance 3-phase 3.7 kW 2-pole line start permanent magnet synchronous motor for pumping system. A method was proposed to study the starting torque characteristics considering line start with high inertia load. A d-q model including cage was built to study the synchronization capability. Time-stepping finite element method analysis was utilized to...
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