Influence of stator slot openings on losses and torque in axial flux permanent magnet machines

Sergeant, Peter; Vansompel, Hendrik; Dupr, Luc

doi:10.1016/j.matcom.2016.03.002

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…In addition, a proper selection of the slot opening might give an optimum performance in terms of cogging torque and the torque ripple [3]. The scope of this paper is to compare different modeling techniques based on their computational efficiency and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Three Analytical Methods for the Precise Calculation of Cogging Torque and Torque Ripple in Axial Flux PM Machines

Hemeida

Hannon

Vansompel

et al. 2016

Mathematical Problems in Engineering

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A comparison between different analytical and finite-element (FE) tools for the computation of cogging torque and torque ripple in axial flux permanent-magnet synchronous machines is made. 2D and 3D FE models are the most accurate for the computation of cogging torque and torque ripple. However, they are too time consuming to be used for optimization studies. Therefore, analytical tools are also used to obtain the cogging torque and torque ripple. In this paper, three types of analytical models are considered. They are all based on dividing the machine into many slices in the radial direction. One model computes the lateral force based on the magnetic field distribution in the air gap area. Another model is based on conformal mapping and uses complex Schwarz Christoffel (SC) transformations. The last model is based on the subdomain technique, which divides the studied geometry into a number of separate domains. The different types of models are compared for different slot openings and permanent-magnet widths. One of the main conclusions is that the subdomain model is best suited to compute the cogging torque and torque ripple with a much higher accuracy than the SC model.

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Section: Introductionmentioning

confidence: 99%

Comparison of Three Analytical Methods for the Precise Calculation of Cogging Torque and Torque Ripple in Axial Flux PM Machines

Hemeida

Hannon

Vansompel

et al. 2016

Mathematical Problems in Engineering

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“…Axial flux permanent magnet synchronous machines (AFPMSMs) are quite modern devices with extensive flexibility not only at high-speed-low-torque but also at low-speed-high-torque applications [1][2][3]. The former is typical for wind turbine applications as the major source of clean and sustainable energy supply.…”

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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Rapid Design of Structural Parameters of Axial-flux Micro-motor Based on Deep Learning

Ge,

Xiao,

Cui

et al. 2024

J. Electr. Eng. Technol.

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Influence of stator slot openings on losses and torque in axial flux permanent magnet machines

Cited by 7 publications

References 23 publications

Comparison of Three Analytical Methods for the Precise Calculation of Cogging Torque and Torque Ripple in Axial Flux PM Machines

Comparison of Three Analytical Methods for the Precise Calculation of Cogging Torque and Torque Ripple in Axial Flux PM Machines

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

Rapid Design of Structural Parameters of Axial-flux Micro-motor Based on Deep Learning

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