Title :
Comparison of Halbach magnetized brushless machines based on discrete magnet segments or a single ring magnet
Author :
Zhu, Z.Q. ; Xia, Z.P. ; Howe, D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK
fDate :
9/1/2002 12:00:00 AM
Abstract :
This paper compares the air-gap field distribution, cogging torque, back-electromotive-force waveform, and efficiency of brushless machines having a Halbach magnetization produced by either discrete magnet segments or a single ring magnet. Results deduced from finite-element analyses are compared with measurements, and the performance of Halbach magnetized machines is compared with that of machines equipped with radially magnetized magnets.
Keywords :
brushless DC motors; finite element analysis; magnetisation; permanent magnet motors; torque; Halbach magnetization; Halbach magnetized brushless machines; NdFeB; air-gap field distribution; anisotropic NdFeB powder; back-electromotive-force waveform; cogging torque; discrete magnet segments; efficiency; finite-element analyses; permanent-magnet machines; radially magnetized magnets; single ring magnet; Air gaps; Anisotropic magnetoresistance; Brushless machines; Finite element methods; Forging; Magnetic anisotropy; Magnetization; Perpendicular magnetic anisotropy; Rotors; Torque;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803190
