A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage

Nuzzo, Stefano; Bolognesi, Paolo; Galea, Michael; Gerada, Chris

doi:10.1109/iemdc.2017.8002280

Cited by 11 publications

(22 citation statements)

References 11 publications

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“…(12) When substituting (12) in (10), due to the effect of integration from 0 to 2pi only the matching spatial harmonics in (8) and (12) produce a contribution to the flux linkage, thus providing an excitation term to (3). Since the latter is a linear-differential equation with constant parameters with respect toī r , at steady state the rotor current waveforms feature a periodic trend whose spectrum includes only the time harmonics provided by (4), i.e.…”

Section: Stator and Rotor Magneto-motive Forcesmentioning

confidence: 99%

“…A general approach to model electromagnetic devices is presented in [1] and [2] where, under simplified assumptions, the integral form of the Maxwell equations are applied to the region where most of the electromechanical conversion take place, namely the main rotor-stator air gap clearance. Application examples of such approach are presented in [3] and [4] addressing synchronous generators and in [5] referring to SCIMs. In [6] an example of modelling the rotor cage based on the concept of the Winding Functions (WFs) is presented and a derivation of a new d − q axes model is introduced.…”

Section: Introductionmentioning

confidence: 99%

“…Considering an isotropic machine structure, i.e. neglecting the effects of the slot openings, the matrix of rotor inductances L rr turns out composed by constant parameters and the expression ( 7) can be simplified as in (3) where the term dφ(α,īs) dt can be represented as in (4).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Torque Ripple Investigation in Squirrel Cage Induction Machines

Marfoli

Sala

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et al. 2019

2019 IEEE International Electric Machines &Amp; Drives Conference (IEMDC)

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Low torque ripple of electrical machines is an important requirement for many different applications. The causes of torque fluctuations in squirrel cage asynchronous induction motors might be a challenging task due to the complex phenomena raised by the whole set of rotor bars. This paper proposes an accurate analysis of the torque contributions distinguishing in time-varying, synchronous and asynchronous components. The investigation is performed by adopting a general analytical approach based on a circuital modelling technique for electromagnetic devices. The analysis aims to identify spatial harmonic interactions between stator and rotor magneto-motive forces which generate torque components. The most interesting effects obtained from the analytical investigation are compared and validated against finite element results for the most significant operating points.

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Section: Stator and Rotor Magneto-motive Forcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Torque Ripple Investigation in Squirrel Cage Induction Machines

Marfoli

Sala

Papini

et al. 2019

2019 IEEE International Electric Machines &Amp; Drives Conference (IEMDC)

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“…To take into account the high-order harmonics produced by the slotting effects on the analysed SG, 8 samples per slot pitch are considered and this results in the dataset shown in (7). The data points for I s , γ and i f in (8), ( 9) and (10) were selected according to a detailed sensitivity analysis aimed at identifying an optimal number of points that can cover all the nominal values of these variables ranging from no-load to rated load, also considering the most relevant power factor values, while keeping a high accuracy in any load condition.…”

Section: B Lookup Tables Constructionmentioning

confidence: 99%

“…Recently, a number of works focusing on either hybrid analytical-numerical [7], [8] or analytical methodologies supported by numerical analyses are being developed. This 'best of both worlds' concept [9] has significant potential as it can benefit from the main strengths of both methodologies.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Classical Synchronous Generators Using Size-Efficient Lookup Tables With Skewing Effect

et al. 2019

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In this paper, an analytical model aimed at reducing computational times for the analysis of classical synchronous generators is proposed and validated. While the proposed model's attractiveness comes from its simple and fast nature, however, it also features excellent levels of accuracy. This is achieved by the model's ability to consider aspects like saturation and space harmonics. Such features are usually investigated with computationally-heavy finite element analysis. The proposed method shows that an appropriate flux linkage map of all the machine windings as a function of currents and rotor position can be used to accurately consider these features at no cost of time or accuracy. Furthermore, the integration of the skewing effect within the model has also been proposed by incorporating it within the flux linkage map. The proposed method is investigated through the use of a 72.5kVA, wound field, salient pole synchronous generator. The results are compared with those of a finite element model and also against experimental measurements on a physical prototype. The advantages of the proposed procedure are discussed, where the model's suitability for carrying out lengthy and multiple simulations and its flexibility are highlighted.INDEX TERMS Harmonics, lookup tables, modelling, skewing effect, synchronous generators.

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Mid-Complexity Circuital Model of Induction Motor with Rotor Cage: A Numerical Resolution

Marfoli

Bolognesi

Papini

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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A general middle complexity model of electromagnetic devices is applied to a cage induction motor. Such modelling approach has been simplified and adapted in order to pursue a fair representation of the electrical machine. Particular attention was given to the rotor cage, proposing a simplified representation exploiting the symmetry of the cage itself. A comparative analysis vs the results provided by a finite element model is also presented for validation purposes aiming to assess the accuracy of the proposed method.

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A hybrid analytical-numerical approach for the analysis of salient-pole synchronous generators with a symmetrical damper cage

Cited by 11 publications

References 11 publications

Torque Ripple Investigation in Squirrel Cage Induction Machines

Torque Ripple Investigation in Squirrel Cage Induction Machines

Modeling of Classical Synchronous Generators Using Size-Efficient Lookup Tables With Skewing Effect

Mid-Complexity Circuital Model of Induction Motor with Rotor Cage: A Numerical Resolution

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