Analytical Calculation and Optimization of Magnetic Field in Spoke-Type Permanent-Magnet Machines Accounting for Eccentric Pole-Arc Shape

This paper presents an analytical method for calculating and optimizing magnetic field in spoke-type permanent-magnet machines accounting for eccentric pole-arc shape. Normalized flux density is derived from conformal transformation taking into account eccentric pole-arc shape, and final field solut...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 53; no. 9; pp. 1 - 7
Main Authors Zhou, Yu, Li, Huaishu, Ren, Ningning, Xue, Zhiqiang, Wei, Yingsan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Air gaps
Conformal mapping
Conformal transformation
eccentric pole-arc shape
Eccentricity
Finite element method
Flux density
magnetic field
Magnetic fields
Magnetic flux
Magnetism
Mathematical analysis
Optimization
Permanent magnets
permanent-magnet machines
Rotors
Shape
spoke
Stators
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Summary:This paper presents an analytical method for calculating and optimizing magnetic field in spoke-type permanent-magnet machines accounting for eccentric pole-arc shape. Normalized flux density is derived from conformal transformation taking into account eccentric pole-arc shape, and final field solution is predicted according to the flux continuity theorem. The optimal results show the harmonic content of flux density can be reduced a lot by optimizing eccentric distance of eccentric pole arc while fundamental content will reduce a little. The proposed analytical solution on prototype machines is implemented. The finite element (FE) and experimental results confirm that the developed analytical method has high accuracy for predicting and optimizing magnetic field.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2707546