2-D Reduced Model for Eddy Currents Calculation in Litz Wire and Its Application for Switched Reluctance Machine

Al, Moustafa; Bouillault, Frédéric; Marchand, Claude; Krebs, Guillaume

doi:10.1109/tmag.2015.2486838

Cited by 22 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6). This graph does not include models based on the combination of finite element and experimental results [35], reduced order models [36], [37], [38], [39], [40], [41], [42], homogenization method [43], and modelling based on complex permeability [44]. In the literature, proximity effect losses are quantified using formulations based on current density, equivalent AC resistance, or external magnetic flux density.…”

Section: B Models In the Literaturementioning

confidence: 99%

See 1 more Smart Citation

AC Losses in Windings: Review and Comparison of Models With Application in Electric Machines

Hajji,

Hlioui,

Louf

et al. 2024

IEEE Access

View full text Add to dashboard Cite

Industry is increasingly adopting high-speed electric machines due to their high-power density and low cost. However, increasing the speed leads to many challenges that are worth to study since they have relevant impact on the design of the machine. One of these challenges is the losses in stator winding assembly. At low frequency, losses in windings are usually assumed equal to DC losses. However, at high frequency some phenomena become noticeable and worth evaluating since they lead to noticeable losses. AC losses in windings are due to skin effect, proximity effect, and circulating currents. The main models of AC losses in windings in the literature are presented for both circular and rectangular wires. These models are compared using both interior and surface-mounted permanent magnet synchronous machines. Results show that for proximity effect, analytical model is convenient when considering armature reaction only, however, when considering on load case, hybrid model with simple FEA is suitable thanks to its interesting trade-off between accuracy and computation time, which makes it suitable for large-scale optimization. For circulating currents effect, finite element model is unavoidable. Moreover, two important properties concerning circulating currents are stated as well as their mathematical proofs.INDEX TERMS AC losses in windings, electric machine, circulating currents, high speed, proximity effect, skin effect.

show abstract

Section: B Models In the Literaturementioning

confidence: 99%

“…There exist other types of models to evaluate AC losses in conductors: models based on the combination of finite element and experimental results [35], reduced order models [36], [37], [38], [39], [40], [41], [42], homogenization method [43], and modelling based on complex permeability [44]. These models are not included in this paper.…”

Section: Introductionmentioning

confidence: 99%

AC Losses in Windings: Review and Comparison of Models With Application in Electric Machines

Hajji,

Hlioui,

Louf

et al. 2024

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The eddy current of circular current-carrying conductors considering skin effect and nonlinear permeability is obtained in [18] and eddy current losses of litz wire considering different bundle structures and pitch lengths is obtained in [19] by two-dimensional finite element method. Eddy current losses of stator windings in high speed permanent magnet AC motors and switched reluctance machines are obtained in [20]- [22] by two-dimensional finite element method. Though the three-dimensional finite element model for the calculation of circulating current losses in stator windings considering the actual transposed structure is established in [23], [24], however eddy currents in stator strands are not considered.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Eddy Current Losses in Stator Windings of Large Hydro-Generator Considering Transposed Structure Based on Analytical Calculation Method

Bian

Liang

2019

IEEE Access

View full text Add to dashboard Cite

Aimed at the problem that the existing calculation method of eddy current losses in stator windings of large hydro-generators cannot consider the transposed structure and circulating current, the equivalent circuit model considering the actual transposed structure and circulating current is established, and the analytical calculation method for eddy current losses of stator winding is proposed in this paper, which is suitable for different transposed structures. Then, eddy current losses of stator transposed winding in an 180MW hydro-generator is analyzed by the proposed method and validated by the finite element method. Finally, the influence of the transposed structure on eddy current losses of stator windings is analyzed quantitatively and compared with the existing calculation method. The results show that the value and distribution trend of eddy current losses in strands change a lot when considering the influence of circulating current and the actual transposed structure, and the influence is different for different transposed structures, which must be considered.INDEX TERMS Analytical calculation method, eddy current losses, large hydro-generator, stator winding, transposed structure.

show abstract

“…This method is often used for 2D or 3D analyses related with operation of electrical machines, as in [9][10][11][12]. The correlation between the eddy current losses and the winding geometry with solid or stranded conductors, woven or twisted, using the 2D finite elements model is analyzed in [13][14][15] for switched reluctance machine.…”

Section: Introductionmentioning

confidence: 99%

Influence of strands transposition on current distribution and power losses in windings of AC machines

Tomičić¹,

Havaš

Srpak

2018

Teh. glas. (Online)

View full text Add to dashboard Cite

This paper analyses how the type of winding affects the current distribution and power losses in armature winding. Using finite element method, four different types of winding used in large asynchronous motors are analyzed: form-wound concentric, with and without transposition, and form-wound barrel, with and without transposition, for the stationary state. In two cases, the calculation shows clear differences between maximum currents in strands, a shift in their phases, and a resulting increase of AC resistance. In two other cases, minor deviations, smaller phase shift and smaller increase of AC resistance, are detected. It indicates that in certain types of armature winding of large motors the strands transposition leads to significant positive effects in terms of motor power, while in other cases it leads to unnecessary complications making the manufacture of large asynchronous machines more difficult, with relatively small positive effect on the motor power losses.

show abstract

2-D Reduced Model for Eddy Currents Calculation in Litz Wire and Its Application for Switched Reluctance Machine

Cited by 22 publications

References 6 publications

AC Losses in Windings: Review and Comparison of Models With Application in Electric Machines

AC Losses in Windings: Review and Comparison of Models With Application in Electric Machines

Analysis on Eddy Current Losses in Stator Windings of Large Hydro-Generator Considering Transposed Structure Based on Analytical Calculation Method

Influence of strands transposition on current distribution and power losses in windings of AC machines

Contact Info

Product

Resources

About