Title :
Tubular modular permanent-magnet machines equipped with quasi-Halbach magnetized magnets-part I: magnetic field distribution, EMF, and thrust force
Author :
Wang, Jiabin ; Howe, David
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK
Abstract :
This paper describes the analysis, design, and experimental characterization of three-phase tubular modular permanent-magnet machines equipped with quasi-Halbach magnetized magnets. It identifies feasible slot/pole number combinations and discusses their relative merits. It establishes an analytical expression for the open-circuit magnetic field distribution, formulated in the cylindrical coordinate system. The expression has been verified by finite-element analysis. The analytical solution allows the prediction of the thrust force and electromotive force in closed forms, and provides an effective tool for design optimization, as will be described in Part II of the paper.
Keywords :
electric potential; electromagnetic forces; finite element analysis; linear machines; magnetic fields; permanent magnet machines; permanent magnets; EMF; cylindrical coordinate system; electric potential; electromagnetic forces; electromotive force; finite-element analysis; linear machines; magnetic field analysis; open-circuit magnetic field distribution; quasi-Halbach magnetized magnets; slot-pole number combinations; three phase tubular modular permanent-magnet machines; thrust force; Coils; Electromagnetic forces; Machine windings; Magnetic analysis; Magnetic fields; Magnetic flux; Magnetization; Magnets; Stator windings; Stirling engines; Linear machines; magnetic field analysis; permanent-magnet machines;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854328