Finite element calculation of harmonic losses in AC machine windings

Salon, S.J.; Ovacik, Levent; Bailey, J.F.

doi:10.1109/20.250674

Cited by 16 publications

(8 citation statements)

References 1 publication

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“…In pole-zero analysis, the eigenvalues of the system deÿned by equation (16) are found. The dynamic equation of motion (11) which is a second-order di erential equation can be converted into an equation of order one [26], so that it will be the same as the circuit equation (15) and it can be solved using circuit simulation techniques.…”

Section: Electrical Circuit Simulationmentioning

confidence: 99%

“…Equation (23) is similar to the circuit equations (15); but the circuit matrices are positive on the diagonal.…”

Section: Q(t)mentioning

confidence: 99%

“…Same authors also studied model reduction techniques for large problems [12].There are studies on coupling the external circuit equations with ÿnite element models. These studies can be classiÿed into two di erent approaches: the equations of the ÿnite element model and circuit model may be handled as a single system of equations [13][14][15][16][17], or ÿnite element part may be handled as a separate system which communicates with the circuit model [18][19][20][21]. The ÿrst approach is called direct coupling and the second is called indirect coupling.…”

mentioning

confidence: 99%

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An electrical circuit theoretical method for time- and frequency- domain solutions of the structural mechanics problems

Ekinci

Atalar

1999

Int. J. Numer. Meth. Engng.

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SUMMARYShrinking device dimensions in integrated circuit technology made integrated circuits with millions of components a reality. As a result of this advance, electrical circuit simulators that can handle very large number of components have emerged. These programs use new circuit simulation techniques and can ÿnd solutions accurately and quickly. In this paper, we apply these techniques to structural mechanics problems by adopting electrical circuit equivalents. We ÿrst apply ÿnite element formulation to the mechanical problem. The obtained sets of equations are treated as if they are sets of equations of an equivalent electrical circuit which consists of linear circuit elements such as capacitors, inductors and controlled sources. The equivalent circuit is obtained in the form of a circuit netlist and solved using a general purpose electrical circuit simulator. Several examples showing the advantages of the circuit simulation techniques are demonstrated. Asymptotic waveform evaluation technique which is widely used for simulation of large electrical circuits is also studied for the same examples and the speed-up advantage is shown.

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Section: Electrical Circuit Simulationmentioning

confidence: 99%

“…Equation (23) is similar to the circuit equations (15); but the circuit matrices are positive on the diagonal.…”

Section: Q(t)mentioning

confidence: 99%

mentioning

confidence: 99%

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An electrical circuit theoretical method for time- and frequency- domain solutions of the structural mechanics problems

Ekinci

Atalar

1999

Int. J. Numer. Meth. Engng.

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“…The finite element (FE) method associated with a time‐stepping scheme is often used to compute the copper losses in electromagnetic systems coupled with electric circuits. It gives a numerical solution for the strong electromagnetic coupling between current density with its nonuniform distribution due to eddy currents and time varying magnetic field penetrating the copper conductors . For post processing of the simulation data such as the copper losses calculation, it has to be ensured that the evaluated data describe the steady‐state conditions without any transient components.…”

Section: Introductionmentioning

confidence: 99%

Model‐order nonlinear subspace reduction of electric machines by means of POD and DEI methods for copper losses calculation

Bouillault

Marchand

et al. 2017

Int J Numerical Modelling

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The simulation of electric machines in order to calculate the copper losses is about a time‐dependent electromagnetic problem. When the finite element method associated with a time stepping scheme is used to solve the problem, the solution is strongly linked to initial conditions, among which the most important is the solution at the initial time. Because it is practically chosen as an arbitrary solution, several time‐consuming electrical excitation periods must be simulated therefore to reach finally the steady‐state conditions. The copper losses can be calculated now without any transient components that can affect the credibility of the copper losses amount. This article suggests a model‐order reduction method that benefits from the complete model finite element solution of the first transient electrical period, to calculate the reduced model solution in the subsequent periods using the proper orthogonal decomposition approach combined with the discrete empirical interpolation method. Nevertheless, in case of relatively high frequency excitation, the full reduction of the problem leads to significant imprecision in the amount of copper losses. To improve the accuracy, therefore, a nonlinear subspace model‐order reduction is adopted. It ensures concurrently higher precision and a reduced computational time.

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“…Advances have been made in theoretical analysis [1], [2] and numerical simulation [3], [4], but experimental verification has proved to be challenging.…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Precision Calorimeter for Measuring Power Loss in Electrical Machines

Cao

Bradley

Ferrah

2009

IEEE Trans. Instrum. Meas.

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Finite element calculation of harmonic losses in AC machine windings

Cited by 16 publications

References 1 publication

An electrical circuit theoretical method for time- and frequency- domain solutions of the structural mechanics problems

An electrical circuit theoretical method for time- and frequency- domain solutions of the structural mechanics problems

Model‐order nonlinear subspace reduction of electric machines by means of POD and DEI methods for copper losses calculation

Development of a High-Precision Calorimeter for Measuring Power Loss in Electrical Machines

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