Use of a permeance model to predict force harmonic components and damper winding effects in salient-pole synchronous machines (original) (raw)
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1 Abstract-In the paper is shown that, by using the circuit theory which operates with lumped parameters, it is possible to derive mathematical models of a high power salient pole synchronous machine (SPSM), that can take into account the basic processes of the machine. It offers results regarding the electromagnetic and mechanical stresses for a given practical application. The quantitative determinations were performed on an 8000 kW synchronous motor. The results of quantitative determinations are of essential interest in the designing stage, for dynamic characteristics and parameters derivation and for constructive solutions to be chosen.
2019 11th Electrical Engineering Faculty Conference (BulEF)
This paper presents the results from a study of permanent magnet synchronous machines, with magnets positioning in the rotor form like "V". The following types of stator winding (these are the main possibilities for these values of stator slots-Z and pair of poles-p) are investigated: Case 1three-phase, single-layer, full-pitch coil, integral-slot stator winding (3FFPW); Case 2-three-phase, double-layer, shortpitch coil, integral-slot stator winding (3FSPW); Case 3-threephase, single-layer, full-pitch coil, skew slots, integral-slot stator winding (3FSSW); Case 4-five-phase, double-layer, short-pitch coil, fractional-slot stator winding (5FSPW). The conducted analysis is based on the application of finite element method. The benchmark for the results obtained are the amplitude of the first harmonic of the e.m.f. and electromagnetic torque and harmonic order. The research in this article is based on the application of the 2D software computer package FEMM 4.2.
Journal of Materials Processing Technology, 2005
This paper deals with analysis of the magnetic field by using FEM and numerical computation of the electromechanical characteristics of salient synchronous motor with damper. The knowledge of electromechanical characteristics is very important in performance analysis of electrical machines, in general. In this paper it is presented a methodology for numerical calculation of electromechanical quantities, starting with the determination of the magnetic field distribution based on FEM.
Proceedings of the Institution of Electrical Engineers, 1967
Real electrical machines differ from the conventional models of generalised theory primarily in three ways: they are magnetically nonlinear, windings produce m.m.f. harmonics in addition to the fundamental, and air-gap permeance harmonics higher than the second are significant. The practical effects of the latter two complications on terminal characteristics are discussed with particular reference to waveforms in a small but otherwise conventional synchronous machine. Axis transform methods are of little or no value in such situations, and two numerical techniques for direct solution of the machine equations are discussed. A Runge-Kutta computation establishes that high accuracy is obtained by consideration of a modest number of harmonics, so that a highly efficient procedure based on Newton-Raphson reduction is possible. In the case of the popular 3-wire star connection, the equations reduce to essentially the conventional d, qaxis equations plus an additional one giving the neutral potential. On the other hand, the 4-wire star and the mesh connections yield equations not in accord with the d, q equations, and significant time harmonics can result.
IEEE Transactions on Magnetics, 2004
This paper models and simulates a salient-pole synchronous generator using a modified winding function theory and more precise stator and rotor winding distribution with dynamic eccentricity between the stator and rotor. Air-gap permeance is also computed more accurately compared to currently available methods. Inductances with this method are compared to those obtained from other methods and it is shown that the results are closer to those obtained from finite element computations. Finally, the calculated inductances are used in a coupled electromagnetic model for simulation and studying the frequency spectrum of the stator line current in the presence of dynamic eccentricity.
Mathematics and Computers in Simulation, 2006
Considering the space harmonics caused by the faulted windings, a simulation model of internal faults in salient pole synchronous machines is proposed in this paper. The model is based on the winding function approach, which makes no assumption for sinusoidal symmetrical distribution of the machine windings. A new method of calculation of synchronous machine inductances is presented, in which the space harmonics produced by the windings are readily taken into account. Simulation results for internal faults on the stator windings of a generator at no load and at load are compared with experimental results to verify the accuracy of the proposed model.
IET Electric Power Applications, 2009
An approach to predict the air-gap flux density and voltage harmonics in large synchronous machines is presented. Combining a small number of solutions of magnetostatic finite-element analysis (FEA) with harmonic analysis, the approach allows designers to rapidly investigate the source of flux density harmonic predictions. The method provides the ability to trace flux density predictions to individual mmf-permeance combinations and applies to machines with both integral and fractional slot windings, with arbitrary skew. Predicted results are compared with that of measured values of open-and short-circuit air-gap flux density in one machine. Opencircuit voltage predictions for five machines are compared with measurements and predictions using commercial FEA.
European Transactions on Electrical Power, 2008
In this paper, we exploit the multiple symmetries and the discrete character of the current distribution to express the torque and the radial forces in a PM synchronous machine. Under some assumptions, the magnetic field can be built with a limited number of discrete functions. These functions can constitute an orthogonal base of a vector space for the representation of the machine magnetic state. The representation of the stator and rotor fields as vectors of this space makes it possible to interpret the torque and the radial forces from the concept of distance between these vectors. The proposed method for torque and radial forces computation is well suited for a real-time evaluation and can be used for a generalization of the Field-Oriented Control to machines with non-sinusoidal flux distribution.
Thermal Analysis of Salient Pole Synchronous Machines by Multiple Model Planes Approach
2020 International Conference on Electrical Machines (ICEM), 2020
This paper presents the lumped parameter thermal network of high power salient pole synchronous machine. For this purpose, the multi-model planes approach is implemented. Accordingly, the active machine parts divided into three planes, and to model the end windings, two other planes are added to model the driven and non-driven end-windings regions of the machine. In addition, it describes the challenges and provides solutions to dominate them during thermal modeling of the electrical machine by the multi-model planes approach. Finally, the proposed method is validated experimentally on open self-ventilated salient pole synchronous machine, and good correspondence between the analytical and experimental results is obtained.
Modeling and Simulation of Dynamical Processes in High Power Salient Pole Synchronous Machines
2011
In nowadays electrical drives that must satisfy complex technological processes often use high power synchronous machines. Design of such motors must account not only for stationary but also for dynamical operation. Then the predetermination of the dynamical operation by modeling and simulation becomes a mandatory step in deriving parameters and constructive solutions. In this paper we propose a mathematical model, a useful and versatile instrument in achieving this objective with accuracy. Quantitative results underline the valuable information produced by modeling and simulating different approaches to saturation in the synchronous machine under dynamic working conditions.