Determination of Saturated Values of Rotating Machinery Incremental and Apparent Inductances by an Energy Perturbation Method

Nehl, T. W.; Fouad, F. A.; Demerdash, Nabeel A. O.

doi:10.1109/tpas.1982.317296

Cited by 102 publications

(39 citation statements)

References 11 publications

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“…where L is the matrix of the windings' apparent self and mutual inductances of/between the 16 circuits of this machine, which is computed by an energy-perturbation FE field solution technique [8] and constitutes a key machine parameter output of the FE portion of the CFE-SS modeling environment. Now substituting for I from (3) into (1) and rearranging, yields the SS model equation of salient-pole synchronous generators as follows:…”

Section: The State-space Model and The Lumped Parameter Circuit Reprementioning

confidence: 99%

“…Consequently, using (3), the various windings' instantaneous steady-state currents are obtained. In this SS portion of the modeling environment, L, and its inverse L ¡1 are made available from the FE energy-perturbation magnetic field computations [8] at each time sample (rotor position) in the solution period. Also the rotor speed !…”

Section: The State-space Model and The Lumped Parameter Circuit Reprementioning

confidence: 99%

“…With the availability of ever increasingly powerful computers and numerical techniques of solving state-space (SS) equations, and magnetic field solutions such as the time (position) stepping finite-element (FE) method, it is now feasible to calculate the actual time-domain profiles of machine winding parameters such as inductances and consequently the instantaneous steady-state waveforms of currents and voltages in the natural ABC frame of reference as successfully demonstrated in a variety of ac synchronous-type generators [6][7][8][9][10]. Contrary to the approach presented here, in the case of Kulig, et al's work [6] magnetic nonlinearities were excluded [6].…”

Section: Introductionmentioning

confidence: 99%

“…One of the unique features in this work is the approach developed here for modeling the damper cage effects, which does not include previously prevailing approximating assumptions such as sinusoidally distributed currents in damper cage bars, and associated sinusoidally distributed MMFs [1,2,[7][8][9]. In this work an effective method of representing the damper cage as several circuits which are both magnetically and conductively coupled, is provided.…”

Section: Introductionmentioning

confidence: 99%

“…The time stepping FE model, combined with the well-established and experimently verified energy-perturbation method of calculation of apparent inductances [7,8], centers on the computation of the magnetic field solutions and machine winding inductance waveforms/profiles at a sampling sequence of rotor positions covering 360 ± e (an ac cycle) of the rotor position. Each one of these inductances has a nonsinusoidal yet periodic profile, which depends on the instantaneous values of the currents in the stator windings, rotor field winding, and damper circuits, as well as saturation, magnetic circuit topology, nonlinearities, etc., at each rotor position covering 360 ± e. It should be emphasized that the set of winding inductances inherently include every conceivable mutual inductance coupling term between the kd and kq damper circuit representations which assume non-zero values [11].…”

Section: Introductionmentioning

confidence: 99%

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A coupled finite-element state-space approach for synchronous generators. I. model development

Deng

Demerdash

1996

IEEE Trans. Aerosp. Electron. Syst.

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Presented here is the development of a time stepping coupled finite-element state-space (CFE-SS) modeling environment, totally within the natural time domain ABC flux-linkage frame of reference, to predict the steady-state machine parameters and performance characteristics, including laminated iron core losses, of salient-pole synchronous machines. The time stepping CFE-SS model allows one to rigorously account for the full synergistic impact of space harmonics and time harmonics on the machine parameters and performance characteristics.Manuscript

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Section: The State-space Model and The Lumped Parameter Circuit Reprementioning

confidence: 99%

Section: The State-space Model and The Lumped Parameter Circuit Reprementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A coupled finite-element state-space approach for synchronous generators. I. model development

Deng

Demerdash

1996

IEEE Trans. Aerosp. Electron. Syst.

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Modeling, parameter measurement and sensorless speed estimation of IPM synchronous generator for direct drive variable speed wind turbine application

Chowdhury

Haque

Das

et al. 2014

Int. Trans. Electr. Energ. Syst.

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SUMMARY This paper presents simple methods of determining parameters of interior permanent magnet (IPM) synchronous generator such as magnet flux (λM), d‐axis inductance (Ld) and q‐axis inductance (Lq) of IPM synchronous generator, which are used to control the wind turbine generator. These methods are simple and do not require any complex theory, signal injection or special equipment. Moreover, a sensorless speed estimator is proposed to estimate the speed of the generator without using speed sensor. The measured parameters are used in this speed estimator. The elimination of speed sensor will enhance the system robustness and reduce the design complexity and system cost for a small‐scale wind turbine considered in this paper. The effectiveness of parameter measurement methods and sensorless speed estimator is demonstrated by experimental results. Experimental results show that the proposed speed estimator that uses the measured parameters can estimate the generator speed with a small error. Copyright © 2014 John Wiley & Sons, Ltd.

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Overview of research evolution in the field of line start permanent magnet synchronous motors

Ugale

Chaudhari

Pramanik

2014

IET Electric Power Applications

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In this study, wide overview of the existing line start permanent magnet synchronous motors literature is presented. The treatment of the subject has been effectively subdivided in to five sections; (i) rotor topologies and design, (ii) steady state analysis, (iii) transient state analysis, (iv) parameter estimation and (v) high efficiency standards. Although, there are numerous papers published in each category, only those important papers which have made significant contributions in the developments and thus triggered research in this field are discussed here. 2 Rotor topologies and design The performance of the Merrill's PM excited synchronous motor [1] was found to be comparable with that of induction motor (IM). Fig. 1 shows the Merrill's rotor configuration. The four sets of flux loops (i.e. A, B, C and D) as shown in the figure, show the corresponding flux patterns under different operating conditions; and should not be taken as a complete flux distribution pattern for a single condition. The machine has negligible reluctance torque component. Alger's discussion on this paper is quite informative and he had postulated that LSPMSM will gain popularity if the future research produces a magnet of higher stored energy and coercive force. Douglas [2], then in 1959, derived the current loci of Merrill's motor by using Blondel's two-reactance theory and predicted that with improved magnet materials, the machine performance would be better. Subsequently, based on the guidelines by Merrill in his paper, a 2 pole, 0.5 hp machine was developed as shown in Fig. 2, and reported by Cahill and Adkins [3]. They found that the rated and the pull-out torque of this machine were less than those of IM of the same frame size because of the lower value of air gap flux density. Moreover, authors observed that this www.ietdl.org

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Determination of Saturated Values of Rotating Machinery Incremental and Apparent Inductances by an Energy Perturbation Method

Cited by 102 publications

References 11 publications

A coupled finite-element state-space approach for synchronous generators. I. model development

A coupled finite-element state-space approach for synchronous generators. I. model development

Modeling, parameter measurement and sensorless speed estimation of IPM synchronous generator for direct drive variable speed wind turbine application

Overview of research evolution in the field of line start permanent magnet synchronous motors

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