Rotor Yoke Thickness of Coreless High-Speed Axial-Flux Permanent Magnet Generator

Sadeghierad, M.; Darabi, Ahmad; Lesani, Hamid; Monsef, Hassan

doi:10.1109/tmag.2008.2010452

Cited by 29 publications

(14 citation statements)

References 14 publications

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“…By applying the flux conservation law in each zone, a relation between the rotor flux and the global variables of the system can be established. An example is given in (8) and (9) for the flux guide between poles (f g = 1).…”

Section: Stator Flux Densitymentioning

confidence: 99%

“…A developed multiphysics model considering the electromagnetic, thermal and mechanical coupling was proposed and experimentally validated. The literature on the design of Axial Flux Permanent Magnet Machine (AFPM), includes, for example, the study of toothless structures that reduces the core losses [7], the influence P. Akiki of rotor thickness on efficiency [8] and the optimization of PMs shape in order to reduce the cogging torque [9]. In most of these studies, axial flux machines are presented with surface rare-earth PM.…”

Section: Introductionmentioning

confidence: 99%

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Axial Ferrite-Magnet-Assisted Synchronous Reluctance Motor

Akiki

Hage-Hassan

Bensetti

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

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This paper presents a noval 18 poles /16 slots Axial Flux Permanent Magnet-Assisted Synchronous Reluctance Motor (AF-PMASynRM) with non-overlapping concentrated winding. At first, the torque ripple and iron losses are analyzed using 3D Finite Element Analysis (3D-FEA). Then, a comparison between 3D-FEA and 2D-FEA based on flux and iron losses is established. In this paper, we propose to design the motor for high torque low speed application using a multiobjective optimization. In this kind of iterative procedure, the use of Finite Element is generally time consuming. Thus, we propose a 2D analytical saturated model that considers the local saturation near the iron bridges and the slot tangential leakage flux. The magnetic model is coupled with an electrical model that computes the power factor and the voltage at the motor terminals. A loss model is also developed to calculate the copper and the iron losses. The proposed analytical model is 5 times faster than the 2D-FEA. The optimal axial structure is compared to a previously optimized radial motor in order to evaluate the design benefits of axial flux machines.

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Section: Stator Flux Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Axial Ferrite-Magnet-Assisted Synchronous Reluctance Motor

Akiki

Hage-Hassan

Bensetti

et al. 2018

2018 XIII International Conference on Electrical Machines (ICEM)

View full text Add to dashboard Cite

show abstract

“…Most, if not all, literature in this field has considered the rotor as a simple rotating disk in an enclosure and thus the presence of the magnets at the rotor disk was neglected [15,16]. Within this framework, Coren et al [17] presented experimental data for the windage losses associated with a rotating disk in a rotor-stator cavity with a superimposed throughflow of air at high rotational Reynolds numbers up to the range of Re = 10 7 .…”

Section: Introductionmentioning

confidence: 99%

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

2016

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Abstract:In this paper, a set of correlations for the windage power losses in a 4 kW axial flux permanent magnet synchronous machine (AFPMSM) is presented. In order to have an efficient machine, it is necessary to optimize the total electromagnetic and mechanical losses. Therefore, fast equations are needed to estimate the windage power losses of the machine. The geometry consists of an open rotor-stator with sixteen magnets at the periphery of the rotor with an annular opening in the entire disk. Air can flow in a channel being formed between the magnets and in a small gap region between the magnets and the stator surface. To construct the correlations, computational fluid dynamics (CFD) simulations through the frozen rotor (FR) method are performed at the practical ranges of the geometrical parameters, namely the gap size distance, the rotational speed of the rotor, the magnet thickness and the magnet angle. Thereafter, two categories of formulations are defined to make the windage losses dimensionless based on whether the losses are mainly due to the viscous forces or the pressure forces. At the end, the correlations can be achieved via curve fittings from the numerical data. The results reveal that the pressure forces are responsible for the windage losses for the side surfaces in the air-channel, whereas for the surfaces facing the stator surface in the gap, the viscous forces mainly contribute to the windage losses. Additionally, the results of the parametric study demonstrate that the overall windage losses in the machine escalate with an increase in either the rotational Reynolds number or the magnet thickness ratio. By contrast, the windage losses decrease once the magnet angle ratio enlarges. Moreover, it can be concluded that the proposed correlations are very useful tools in the design and optimizations of this type of electrical machine.

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“…Axial flux PMSGs are widely used for vertical-axis wind turbines [6][7][8][9][10], however, since the axial structure magnet is placed on the inner surface of the rotor without slot and facing the stator, it will lengthen the distance between upper and lower magnets, which in turn requires much more magnet material and cost to improve the operational efficiency. This paper adopts the radial flux type PMSG, which has its stator windings placed in the inner core, needs less magnet, and therefore resulting in cost reduction as well as heat loss elimination.…”

Section: Introductionmentioning

confidence: 99%

Design of High Performance Permanent-Magnet Synchronous Wind Generators

2014

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This paper is devoted to the analysis and design of high performance permanent-magnet synchronous wind generators (PSWGs). A systematic and sequential methodology for the design of PMSGs is proposed with a high performance wind generator as a design model. Aiming at high induced voltage, low harmonic distortion as well as high generator efficiency, optimal generator parameters such as pole-arc to pole-pitch ratio and stator-slot-shoes dimension, etc. are determined with the proposed technique using Maxwell 2-D, Matlab software and the Taguchi method. The proposed double three-phase and six-phase winding configurations, which consist of six windings in the stator, can provide evenly distributed current for versatile applications regarding the voltage and current demands for practical consideration. Specifically, windings are connected in series to increase the output voltage at low wind speed, and in parallel during high wind speed to generate electricity even when either one winding fails, thereby enhancing the reliability as well. A PMSG is designed and implemented based on the proposed method. When the simulation is performed with a 6 Ω load, the output power for the double three-phase winding and six-phase winding are correspondingly 10.64 and 11.13 kW. In addition, 24 Ω load experiments show that the efficiencies of double three-phase winding and six-phase winding are 96.56% and 98.54%, respectively, verifying the proposed high performance operation. OPEN ACCESSEnergies 2014, 7 7106

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Rotor Yoke Thickness of Coreless High-Speed Axial-Flux Permanent Magnet Generator

Cited by 29 publications

References 14 publications

Axial Ferrite-Magnet-Assisted Synchronous Reluctance Motor

Axial Ferrite-Magnet-Assisted Synchronous Reluctance Motor

Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets

Design of High Performance Permanent-Magnet Synchronous Wind Generators

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