Die Feldverteilung und Wirbelstrombildung in den Ankern von Dynamomaschinen bei Ummagnetisierung durch hochperiodige Wechsel- und Drehfelder

Dreyfus, Ludwig

doi:10.1007/bf01660158

Cited by 9 publications

(4 citation statements)

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“…machines systems: (1) the influence of the eddy current-reaction on the magnitude of the winding inductance and (2) the additional heat generated into the rotor by a periodic excitation. Dreyfus [6] has succeeded in describing analytically the proportion between resistive and reactive components of the eddy current in an iron core, by relating reactance and resistance of the eddy current paths to the frequencydependent reduced thickness 1 of the iron. Nevertheless, in Dreyfus' work, the magnetic flux density does not result from the interaction between the exciting and the induced MMF, since the flux density distribution is a starting point in his analysis.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In the present paper, a combination of the approaches of [6][7][8] is presented. By using some simplifying assumptions, the eddy current density and flux density in the salient pole rotor are first obtained as solutions of a differential problem as in [6]. Said solutions are then related to the main geometric dimensions of the electrical machine as in [7,8], in order to evaluate the AC-resistance and inductance of the excitation winding.…”

Section: Introductionmentioning

confidence: 99%

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The influence of eddy currents on the excitation winding impedance of solid and laminated salient pole synchronous machines

2020

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This work investigates the establishment of steady-state eddy currents in solid and laminated salient poles and rotor rim of synchronous machines due to a periodic excitation voltage. It shows that the presence of eddy currents in the rotor magnetic circuit has the double effect of increasing the excitation winding AC-resistance and decreasing its magnetizing AC-inductance. According to that a simple analytical model is presented in here which allows a rapid rough estimation of the excitation winding AC-resistance when little information is available about the machine geometry and its electric/magnetic materials properties. The model is then verified by reproducing in frequency the excitation winding AC-resistance and the related power loss measured in two synchronous generators. Finally, the limits of reliability and applicability of the model are discussed. The model has implications for periodic field winding current control and voltage regulation in synchronous machines.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of eddy currents on the excitation winding impedance of solid and laminated salient pole synchronous machines

2020

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“…The resonance condition can be easily detected using the oscilloscope in XY-mode as it is shown in Figure 9. The ratio between reactance and resistance increases together with the frequency even considering the skin effect [39]. Beyond a given frequency, which accounts for a fraction of Hertz in the usual field windings, the reactance overcomes the winding resistance definitely.…”

Section: Procedures For Estimating the Winding Parallel Resistance By...mentioning

confidence: 99%

An experimentally determined field winding model with frequency‐dependent parameters

Felicetti

Abrahamsson

Lundin

2021

IET Electric Power Appl

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Herein, a set of experimental procedures is presented for determining the main electrical distributed parameters of the field winding in salient pole synchronous machines. It applies to the electrical characterisation of iron‐core power inductors and transformer windings as well, in a range of frequency useful for power electronics applications. A first estimation of the parameters is obtained by forcing the winding into resonance with capacitors of known capacitance. The obtained estimates are then refined through an iterative process, which makes use of the winding natural frequencies. The presented procedures are applied step‐by‐step to the field winding of a 60‐kVA salient pole synchronous generator with solid poles. The distributed parameters model, featured using the outlined procedures, accurately reproduces the winding voltage distribution in a large range of frequency. Finally, it is explored how the interaction between armature and rotor influences the field winding parameters, pointing to the differences of measuring them with the rotor inside or outside the machine bore.

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Wirbelströme in den Eisenblechpaketen von Induktionsmaschinen unter Berücksichtigung der Blechisolation

Nagel

1966

Archiv f. Elektrotechnik

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Die Feldverteilung und Wirbelstrombildung in den Ankern von Dynamomaschinen bei Ummagnetisierung durch hochperiodige Wechsel- und Drehfelder

Abstract: Die Feldverteilung und Wirbelstrombildung in den~Ankern von Dynamomasr bei Ummagnetisierung durch hochperiodige Wechsel-und Drehfelder. Von Dr.-Ing. Ludwig l)reyfus, Berlin-Niedersch6nhausen.

Cited by 9 publications

References 0 publications

The influence of eddy currents on the excitation winding impedance of solid and laminated salient pole synchronous machines

The influence of eddy currents on the excitation winding impedance of solid and laminated salient pole synchronous machines

An experimentally determined field winding model with frequency‐dependent parameters

Wirbelströme in den Eisenblechpaketen von Induktionsmaschinen unter Berücksichtigung der Blechisolation

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