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2020-09-07

Improved Semi-Analytical Magnetic Field Solution for High-Speed Permanent-Magnet Machines with Permeable Retaining Sleeve Including Diffusion Effect

By Gabriel Alves Mendonça, Thales Alexandre Carvalho Maia, and Braz de Jesus Cardoso Filho
Progress In Electromagnetics Research B, Vol. 88, 97-118, 2020
doi:10.2528/PIERB20051904

Abstract

This work presents a novel semi-analytical model for magnetic field calculation in a high-speed surface-mounted permanent-magnet machine with conducting and permeable retaining sleeve. The retaining sleeve with conducting material and non-homogeneous permeability affects the machine electromagnetic performance by altering main flux inductance and developed torque profile. This performance deviation can be attributed to eddy-current reaction field and saturation, the latter occurring due to pole-to-pole leakage flux. Saturation is modeled with a space-varying relative permeability, expressed as a Fourier series. Eddy currents are evaluated with an auxiliary winding, defined as a surface current density in the conducting region. The proposed method is based on well-established Maxwell-Fourier method. This permits other analysis, such as slotting effect through subdomain technique. The assumptions considered for the developed semi-analytical solution in two-dimensional problem are presented in depth and confronted with finite-element method results, confirming validity of proposed methodology.

Citation


Gabriel Alves Mendonça, Thales Alexandre Carvalho Maia, and Braz de Jesus Cardoso Filho, "Improved Semi-Analytical Magnetic Field Solution for High-Speed Permanent-Magnet Machines with Permeable Retaining Sleeve Including Diffusion Effect," Progress In Electromagnetics Research B, Vol. 88, 97-118, 2020.
doi:10.2528/PIERB20051904
http://jpier.org/PIERB/pier.php?paper=20051904

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