Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines

Dietz, Armin; Tommaso, A. O. Di; Marignetti, Fabrizio; Miceli, R.; Nevoloso, C.

doi:10.3390/en13051041

Cited by 11 publications

(7 citation statements)

References 23 publications

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“…Depending on the requirements for winding quality and production costs, windings are manufactured in different winding types, such as irregular (random) and regular (orthogonal or orthocyclic) winding as shown in Figure 1. In the literature, there are several definitions of slot packing factor (Dietz et al, 2020). In this paper, the winding's packing factor (PF) is calculated as below:…”

Section: Coil Winding Technologymentioning

confidence: 99%

A new winding homogenization method based on thermal resistance concept

Hashemi,

Yazdanpanah Qaraei,

Shabanian-Poodeh

2024

COMPEL

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Purpose The aim of this paper is to provide a simple yet accurate and efficient geometric method for thermal homogenization of impregnated and non-impregnated coil winding technologies based on the concept of thermal resistance. Design/methodology/approach For regular windings, the periodic microscopic cell in the winding space is identified. Also, for irregular windings, the average microscopic cell of the winding is determined. An approximation is used to calculate the thermal resistance of the winding cell. Based on this approximation, the winding insulation is considered as a circular ring around the wire. Mathematical equations are obtained to calculate the equivalent thermal resistance of the cell. The equivalent thermal conductivity of the winding is calculated using equivalent thermal resistance of the cell. Winding thermal homogenization is completed by determining the equivalent thermal properties of the cell. Findings The thermal pattern of different windings is simulated and compared with the results of different homogenization methods. The results show that the proposed method is applicable for a wide range of windings in terms of winding scheme, packing factor and winding insulation. Also, the results show that the proposed method is more accurate than other winding homogenization methods in calculating the equivalent thermal conductivity of the winding. Research limitations/implications In this paper, the change of electrical resistance of the winding with temperature and thermal contact between the sub-components are ignored. Also, liquid insulators, such as oils, and rectangular wires were not investigated. Research in these topics is considered as future work. Originality/value Unlike other homogenization methods, the proposed method can be applied to non-impregnated and irregular windings. Also, compared to other homogenization methods, the proposed method has a simpler formulation that makes it easier to program and implement. All of these indicate the efficiency of the proposed method in the thermal analysis of the winding.

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Section: Coil Winding Technologymentioning

confidence: 99%

A new winding homogenization method based on thermal resistance concept

Hashemi,

Yazdanpanah Qaraei,

Shabanian-Poodeh

2024

COMPEL

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“…In order to reach higher fill factors, profiled conductors (FIGURE 10 [131]) can be implemented, such as the form-wound and hairpin windings [132], [133], [134], [135]. One of the technologies under development that increases the slot fill factor (theoretically as high as 90%) and reduces the end windings is the utilisation of linear, flyer or needle winding techniques as the one shown in FIGURE 11 [136]. Additional advantages over round conductors are better thermal conductivity and mechanical stability.…”

Section: B Winding Technologies and Insulating Systemsmentioning

confidence: 99%

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

et al. 2022

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This paper presents a review of the state of the art in electric propulsion for regional aircraft in the MW range. The implications surrounding the implementation of this technology, such as the need of high-power density or the use of high-voltage at high-altitude, are presented. Along with the challenges, the available technologies to face them are reviewed. Those are, as follows, the emerging new motor topologies for this purpose, the winding technologies, the materials employed for electric motors for aircraft propulsion and the ground-breaking use of high-temperature superconductors (HTS) as a high-power density enabler. Finally, a conclusion is presented gathering the main ideas of the paper.INDEX TERMS Aircraft propulsion, electric motor, high-power, high-temperature superconductor, high-voltage.

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“…The ratio between slot the surface and the wire cross-section surfaces is between 0.5 and 0.8 depending on the manufacturing process [14]. The improvement of electrical machines' slot filling factors is still studied today [15]. The wire layout is hardly controlled on the machine-made end-windings.…”

Section: Application To a Lot Of Slot Shapes With A Random Layout Of Round Wiresmentioning

confidence: 99%

Steady State and 2D Thermal Equivalence Circuit for Winding Heads—A New Modelling Approach

Petitgirard

Piguet

Baucour

et al. 2020

MCA

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The study concerns the winding head thermal design of electrical machines in difficult thermal environments. The new approach is adapted for all basic shapes and solves the thermal behaviour of a random wire layout. The model uses the nodal method but does not use the common homogenization method for the winding slot. The layout impact can be precisely studied to find different hotspots. To achieve this a Delaunay triangulation provides the thermal links between adjoining wires in the slot. Voronoï tessellation gives a cutting to estimate thermal conductance between adjoining wires. This thermal behaviour is simulated in cell cutting and it is simplified with the thermal bridge notion to obtain a simple solving of these thermal conductances. The boundaries are imposed on the slot borders with Dirichlet condition. Then solving with many Dirichlet conditions is described. Some results show different possible applications with rectangular and round shapes, one ore many boundaries, different limit condition values and different layouts. The model can be integrated into a larger model that represents the stator to have best results.

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Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines

Cited by 11 publications

References 23 publications

A new winding homogenization method based on thermal resistance concept

A new winding homogenization method based on thermal resistance concept

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

Steady State and 2D Thermal Equivalence Circuit for Winding Heads—A New Modelling Approach

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