Wyniki wyszukiwania - BazTech

1

Improvement of the model of an asynchronous traction motor of an electric locomotive by taking into account power losses

Goolak Sergey, Riabov Ievgen, Gorobchenko Oleksandr, Yurchenko Viktor, Nezlina Olena

Przegląd Elektrotechniczny

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2022

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R. 98, nr 5

1--10

EN

The paper proposes an improved model of an asynchronous traction motor, taking into account magnetic losses in the steel of the motor, as a function of time, based on the equations of specific losses. When conducting research, a mathematical model of an asynchronous motor, made in the MATLab software environment, was used. Based on the simulation results, the value of average magnetic losses and time diagrams of magnetic losses were obtained for the nominal operating mode of the motor. The results obtained are compared with the passport data of the motor.

PL

W pracy zaproponowano udoskonalony model asynchronicznego silnika trakcyjnego uwzględniający straty magnetyczne w stali silnikowej w funkcji czasu, oparty na równaniach strat właściwych. W badaniach wykorzystano model matematyczny silnika indukcyjnego, wykonany w środowisku oprogramowania MATLab. Na podstawie wyników symulacji uzyskuje się wartości średnich strat magnetycznych oraz wykresy czasowe strat magnetycznych dla nominalnego trybu pracy silnika, a uzyskane wyniki porównuje się z danymi paszportowymi silnika.

2

Finite element analysis and experimental tests of a permanent magnet synchronous machine for drive train application

Roumani K., Stephan W., Schmuelling B.

Przegląd Elektrotechniczny

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2017

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R. 93, nr 8

138--141

EN

This paper deals with the design and tests of an internal permanent magnet synchronous machine with 12 slots and 10 poles. The machine is analysed under no load condition to estimate the flux linkage and the electromotive force as well as under load condition to calculate the iron core losses, the permanent magnet losses and the output power by utilizing the transient finite element analysis. Several simulation results under no load condition e.g. open circuit voltage and under load condition e.g. torque are compared with those of the experiment to validate the electromagnetic simulation model and to investigate the machine’s characteristics.

PL

W artykule opisano projekt I badania silnika synchronicznego z magnesami trwałymi z 12 szczelinami I 10 biegunami. Silnik analizowano w stanie jałowym w celu określenia strumienia magnetycznego oraz pod obciążeniem w celu określenia strat i mocy wyjściowej. Przeprowadzono symulację I wyniki porównano z danymi eksperymentalnymi.

3

Operating point resolved loss computation in electrical machines

von Pfingsten G., Ruf A., Steentjes S., Hombitzer M., Franck D., Hameyer K.

Archives of Electrical Engineering

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2016

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Vol. 65, nr 1

73--86

EN

Magnetic circuits of electromagnetic energy converters, such as electrical machines, are nowadays highly utilized. This proposition is intrinsic for the magnetic as well as the electric circuit and depicts that significant enhancements of electrical machines are difficult to achieve in the absence of a detailed understanding of underlying effects. In order to improve the properties of electrical machines the accurate determination of the locally distributed iron losses based on idealized model assumptions solely is not sufficient. Other loss generating effects have to be considered and the possibility being able to distinguish between the causes of particular loss components is indispensable. Parasitic loss mechanisms additionally contributing to the total losses originating from field harmonics, non-linear material behaviour, rotational magnetizations, and detrimental effects caused by the manufacturing process or temperature, are not explicitly considered in the common iron-loss models, probably even not specifically contained in commonly used calibration factors. This paper presents a methodology being able to distinguish between different loss mechanisms and enables to individually consider particular loss mechanisms in the model of the electric machine. A sensitivity analysis of the model parameters can be performed to obtain information about which decisive loss origin for which working point has to be manipulated by the electromagnetic design or the control of the machine.

4

Dynamics effects on losses due to rotational magnetization

Sabic D., Pfutzner H., Hofbauer F., Shilyashki G., Mulasalihovic E.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 9b

29-32

EN

As well known, rotational magnetization (RM) may cause high increases of power losses P in comparison to alternating magnetization (AM), in particular for highly grain oriented SiFe. So far, it had been assumed that the loss increase is a mere function of shape of the induction pattern B(t). However, closer investigations reveal that a further impact is given by the angular velocity of the vector B. Compared to low dynamics as being typical for simulations on RSSTs, high dynamics as being typical for T-joint regions of transformer cores yield further increases of losses. For elliptic RM, the increases are rather weak and tend to decrease with rising axis ratio a. On the other hand, distinctly increased P arises for rhombic RM as being typical for transformers. Further increases result for oblique rhombic RM as arising close to overlaps. On the other hand, lower P is given for the case of DC bias due to the fact that anomalous eddy current losses play a weaker role here.

PL

Magnesowanie rotacyjne powoduje wzrost trat szczególnie w blachach anizotropowych SiFe. Szczegółowa analiza wykazała że straty te zależą od szybkości kątowej zmian indukcji. Szczególnie duży wzrost strat obserwuje się dla rombowej zmiany, typowej w rdzeniach transformatora. Z drugiej strony podmagnesowanie DC zmniejsza wzrost strat przez zmniejszenia strat dodatkowych powodowanych przez prądy wirowe.