Effects of pulse-width-modulated supply voltage on eddy currents in the form-wound stator winding of a cage induction motor

Islam, Mohammad Jahirul; Arkkio, Antero

doi:10.1049/iet-epa:20080060

Cited by 24 publications

(9 citation statements)

References 12 publications

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“…Therefore, FEA has been the most preferred numerical method in the analysis of the electrical motor. In various studies, it was expressed in detail how three phase induction machine could be modelled with FEA [32][33][34][35][36][37]. FEMM software using finite elements method uses Eq.…”

Section: Finite Element Methodsmentioning

confidence: 99%

Untitled

2017

Teh. vjesn.

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Original scientific paper In this study, a new design was suggested in order to improve the performance of induction motors. In the proposed design, slits were applied in the middle of stator and rotor teeth. In these slitted models, the depth and width of slits were optimized with Finite Element Method Magnetics (FEMM) software using Finite Elements Method (FEM). To show performance improvement, suggested motor model and a reference motor model were compared at the rated operating point for the values such as input and output power, input current, power factor, efficiency and losses. Because of the decreases in both iron and copper losses, total losses in motor were reduced and the efficiency for rated operating point was improved by 1,869%. In the modelling, 3 kW squirrel-cage induction motor was used. Keywords: induction motor efficiency; motor losses; slitted tooth core design Porast učinkovitosti asinkronih motora pomoću dizajna jezgre s procijepljenim zubomIzvorni zanstveni članak U ovom istraživanju predložen je novi dizajn kako bi se poboljšala učinkovitost rada asinkronih motora. U predloženom dizajnu primjenjeni su procijepi u sredini zubi statora i rotora. U ovim procijepljenim modelima dubina i širina procijepa su optimizirani uz pomoć programa Magnetska metoda konačnih elemenata (FEMM) i koristeći Metodu konačnih elemenata (FEM). Za prikaz poboljšanja izvedbe, predloženi model motora i referentni model motora su uspoređeni u definiranim pogonskim tačkama za vrijednosti kao što su ulazna i izlazna snaga, ulazna struja, faktor snage, efikasnost i gubitci. Zbog smanjenja gubitaka željeza i bakra, ukupni gubitak u motoru je smanjen, a povećana je efikasnost za definiranu pogonsku tačku za 1,869%. U modeliranju korišten je 3 kW kavezni asinkroni motor.

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Section: Finite Element Methodsmentioning

confidence: 99%

Untitled

2017

Teh. vjesn.

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“…Thus, both the leakage flux and the main air‐gap flux should be considered [30]. When the machine is supplied by a frequency converter, this total magnetic flux can be divided into three components [31]: (i) fundamental‐frequency flux of the motor; (ii) high‐frequency spatial harmonic fluxes related to the winding distribution, stator/rotor slottings, saturation of the core and rotor movement; (iii) high‐frequency time harmonic fluxes associated with the PWM supply. To take all these aspects into account and represent these higher harmonics, a time‐stepping analysis is required [32].…”

Section: Induction Motor Modelling For the Proposed Analysismentioning

confidence: 99%

Electrostatic shielding for bearings discharge currents attenuation: analysis of its effectiveness, losses and impact on the motor performance – a study for design guidelines

Êvo

Paula

2020

IET Electric Power Applications

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The authors deal with the use of electrostatic shielding to mitigate the electric discharge machining (EDM) currents on the induction machine bearings. Employing 2D and 3D models, several finite element analysis (FEA) simulations were thoroughly made addressing the shielding effectiveness to attenuate the shaft-to-frame voltage and the associated eddy current losses for different shield widths, thicknesses and materials. The obtained results provide very good guidelines for the practical design of the shielding device. In addition, comparisons between frequency-and time-domain models highlight the importance of considering factors such as the saturation of the iron core, the rotor movement and non-sinusoidal sources to compute the eddy current losses in the shield. Besides, the authors present a comprehensive theoretical review of the EDM currents, where the main influencing factors and action mechanisms are compiled in a clear and didactic approach, for the purpose of broad comprehension.

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“…It is seen in [4] that the AC copper loss during converteroperation can be in the range from 40 % to 198 % of the DC copper loss. For large hydrogenerators, the heating of the stator is often the limiting factor in the design.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Additional Eddy-Current Copper Losses in Large Converter-Fed Hydropower Generators

Engevik

Valavi

Nysveen

2018

2018 XIII International Conference on Electrical Machines (ICEM)

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This paper investigates the effect of converter operation on AC copper losses in the stator and damper windings of a large hydrogenerator. Stator currents are computed using finite element simulations. The computed current waveforms are used as an input to estimate the AC copper losses in the stator due to converter operation using an analytical approach. Damperbar losses are calculated directly in the finite element analysis. The generator is simulated with a two-level voltage source converter and a three-level neutral-point-clamped converter topology. Different carrier frequencies are used to investigate their effect on the AC copper loss. Methods for handling these additional losses are discussed and analysed.

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Effects of pulse-width-modulated supply voltage on eddy currents in the form-wound stator winding of a cage induction motor

Cited by 24 publications

References 12 publications

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Electrostatic shielding for bearings discharge currents attenuation: analysis of its effectiveness, losses and impact on the motor performance – a study for design guidelines

Analysis of Additional Eddy-Current Copper Losses in Large Converter-Fed Hydropower Generators

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