Determination of Maximum Electromagnetic Torque in PM Brushless Machines Having Two-Segment Halbach Array

Author

Yang Shen ; Liu, G.Y. ; Xia, Z.P. ; Zhu, Z.Q.

Author_Institution

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

Volume

61

Issue

2

fYear

2014

fDate

Feb. 2014

Firstpage

718

Lastpage

729

Abstract

This paper develops a 2-D field analytical model for predicting the magnetic field distribution and the corresponding electromagnetic performance in air- and iron-cored permanent magnet (PM) brushless machines having radially or parallel magnetized two-segment Halbach array. A simple equation is derived to directly predict the optimal magnet ratio for maximum electromagnetic torque, while the influence of pole-pair number and magnet thickness on the optimal magnet ratio is investigated for both air- and iron-cored machines. The analytical model is validated by finite-element analyses and also measurements on a prototype 12-slot/10-pole PM brushless machine.

Keywords

brushless machines; finite element analysis; magnetic fields; permanent magnet machines; torque; 2D field analytical model; PM brushless machines; air-cored permanent magnet brushless machines; finite-element analyses; iron-cored permanent magnet brushless machines; magnet thickness; magnetic field distribution prediction; maximum electromagnetic torque determination; optimal magnet ratio prediction; parallel magnetized two-segment Halbach array; pole-pair number; Analytical model; Halbach array; brushless machine; permanent magnet (PM);

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2013.2254101

Filename

6488834