Performance Analysis of Slotless Axial Flux Permanent Magnet Machines with Skewed Magnets under Loading Condition

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Document Type : Article

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Department of Electrical Engineering, Lorestan University, 68151-44316, Khorramabad, Lorestan, Iran

Abstract

This paper presents a new 3D analytical technique for electromagnetic modeling and analysis the slotless axial flux permanent magnet (AFPM) machines. In the proposed technique, Laplace/Poisson equation is solved in different regions while considering the magnetic scalar potential as the main variable. To consider the curvature effect and radial dependency of permanent magnets (PMs), the 3D distribution of PM magnetization is introduced based on Fourier-Bessel series. The boundary conditions are then used to determine the unknown constants of Fourier-Bessel series in air-gap region. The influence of skewed PMs on the flux-linkage of stator phases is studied by using the proposed model under no-load condition while constant keeping the volume of PMs. The proposed 3D model is also extended to calculate the air-gap magnetic field due to stator currents and to extract the inductance matrix. The dynamic performance of studied slotless AFPM motor is then analyzed under voltage-input condition. In final, the accuracy of proposed 3D technique is verified by comparing the corresponding results obtained through proposed analytical model and 3D finite element method (FEM).

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 31 July 2024

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