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Analysis of the Torque Characteristics of a Multi-Degrees of Freedom Surface Permanent-Magnet Motor

Journal of Magnetics, Volume 15, Number 1, 31 Mar 2010, Pages 36-39

Dong-Woo Kang (Department of Electric Engineering, Hanyang University), Sung-Chul Go (Department of Electric Engineering, Hanyang University), Sung-Hong Won (Dongyang Technical College), Seung-Bin Lim (Korea Institute of Energy Technology Evaluation and Planning), Ju Lee *

(Department of Electric Engineering, Hanyang University)

Abstract

The multi-degrees of freedom surface permanent-magnet motor (Multi-D.O.F. SPM) has several degrees of freedom operations that are defined as the “roll”, “yaw”, and “pitch”. Normally, the torque that is generated to rotate a rotor includes ripples. The analysis of the torque ripples is important for improving motor performance. In terms of the electric analysis, torque ripple occurs as a result of many factors, including the rotor and stator structures, the distribution of the air-gap flux density, and the waveform of the current in the coils. In particular, the torque ripple is an important factor in the stable operation of the Multi-D.O.F. SPM. Therefore, in this work, the torque ripple was analyzed using various types of magnetization for the permanent magnet. An improved model was proposed for the Multi-D.O.F. SPM based on this analysis.

Keywords: SPM; spherical motor; magnetization pattern; torque ripple

DOI: 10.4283/JMAG.2010.15.1.036

Full Text: PDF

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