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Start Over Author "Chen, Jintao" Publisher institute of electrical and electronics engineers (ieee)
15 results on '"Chen, Jintao"'

12. Unbalanced Magnetic Forces in Permanent-Magnet Brushless Machines With Diametrically Asymmetric Phase Windings

Author

Zi-Qiang Zhu, Dahaman Ishak, David Howe, and Chen Jintao

Subjects
Physics, business.industry, Phase (waves), Electrical engineering, Mechanics, Finite element calculations, Industrial and Manufacturing Engineering, Finite element method, Magnetic field, Control and Systems Engineering, Electromagnetic coil, Magnet, Pole number, Electrical and Electronic Engineering, Polar coordinate system, business
Abstract

A general analytical model, formulated in 2-D polar coordinates, is developed to predict the unbalanced magnetic force, which results in permanent-magnet brushless ac and dc machines having a diametrically asymmetric disposition of slots and phase windings. It is shown that the unbalanced magnetic force can be significant in machines having a fractional ratio of slot number to pole number, particularly when the electric loading is high. The developed model is validated by finite-element calculations on 9-slot/8-pole and 3-slot/2-pole machines. In addition, the unbalanced magnetic force has been measured on a prototype 3-slot/2-pole machine and shown to be in excellent agreement with predicted results.

Published
2007

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