3-D Magnetic Field and Torque Analysis of a Novel Halbach Array Permanent-Magnet Spherical Motor

We present a three-dimensional (3-D) torque model based on spherical harmonic functions of a Halbach array permanent-magnet (PM) spherical motor. Using the torque model, we show how to realize three-degree-of-freedom motion. We compare the Halbach array PM spherical motor and the conventional parall...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-08, Vol.44 (8), p.2016-2020
Main Authors: Changliang Xia, Changliang Xia, Hongfeng Li, Hongfeng Li, Tingna Shi, Tingna Shi
Format: Article
Language:English
Subjects:
Air gaps
Arrays
Cross-disciplinary physics: materials science
rheology
DC motors
Exact sciences and technology
FEM
Finite element methods
Halbach array PM spherical motor
Induction motors
Magnetic analysis
Magnetic fields
Magnetic flux
Magnetism
Materials science
Mathematical analysis
Mathematical models
Motors
Other topics in materials science
parasitic effect
Permanent magnet motors
Physics
pole-arc coefficient
Rotors
Segments
Spherical harmonics
Torque
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Summary:We present a three-dimensional (3-D) torque model based on spherical harmonic functions of a Halbach array permanent-magnet (PM) spherical motor. Using the torque model, we show how to realize three-degree-of-freedom motion. We compare the Halbach array PM spherical motor and the conventional parallel magnet array spherical motor in terms of spherical harmonic component and amplitude of the torque. We discuss our study of variations of air-gap magnetic field with parallel magnetization directions along different spatial positions in each magnet segment. We also discuss the parasitic effect of the proposed spherical Halbach array magnet. We have verified our results by finite-element method.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.922782