Analytical Prediction of Optimal Split Ratio for Fractional-Slot External Rotor PM Brushless Machines

Author

Yang Shen ; Zhu, Z.Q.

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK

Volume

47

Issue

10

fYear

2011

Firstpage

4187

Lastpage

4190

Abstract

The split ratio is one of the most important design parameters for permanent-magnet (PM) brushless machines. It has been optimized for maximum torque density with both internal rotor and tubular PM brushless machines in existing papers. This paper proposes an analytical model to determine the optimal split ratio for external rotor PM brushless machine having nonoverlapping winding. The influence of winding factor, tooth tip, and end winding on the split ratio is considered. The theoretical analyses are verified by finite element analysis and validated with experimental measurement.

Keywords

brushless machines; finite element analysis; machine windings; permanent magnet machines; rotors; torque; analytical model; analytical prediction; design parameters; end winding; finite element analysis; fractional-slot external rotor permanent-magnet brushless machines; internal rotor; maximum torque density; nonoverlapping winding; optimal split ratio; tooth tip; tubular permanent-magnet brushless machines; winding factor; Analytical models; Brushless machines; Rotors; Stator windings; Torque; Windings; Analytical model; brushless machine; external rotor; permanent magnet; split ratio;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2147286

Filename

6028021