Magnetic field analysis and optimal design of DC permanent magnet coreless disc machine

Author

Gu, C.L. ; Wu, W. ; Shao, K.R.

Author_Institution

Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Hubei, China

Volume

30

Issue

5

fYear

1994

fDate

9/1/1994 12:00:00 AM

Firstpage

3668

Lastpage

3671

Abstract

The magnetic field in a DC permanent magnet coreless disc machine is studied in depth by using different methods, such as three dimensional finite element method (3DFEM), two dimensional finite element method (2DFEM) and magnetic circuit method (MCM) based on an analytical solution. For optimization, the cases for different magnet dimensions, airgap lengths and configurations are investigated in detail. Numerical results show that if the field is provided by the ferrite magnets, the ratio of magnet thickness to airgap length should be greater than 3 and the distance from magnet to stator wall or the width of the magnetism-free channels between two adjacent poles should be greater than 6 mm. Moreover, both 2DFEM and MCM are feasible for general optimal design purpose focusing on practicality and time saving

Keywords

DC machines; finite element analysis; machine theory; magnetic circuits; magnetic fields; optimisation; permanent magnet machines; 2D FEM; 3D FEM; DC permanent magnet machine; airgap lengths; analytical solution; coreless disc machine; ferrite magnets; finite element method; magnet dimensions; magnetic circuit method; magnetic field analysis; optimal design; optimization; three dimensional FEM; two dimensional FEM; DC motors; Ferrites; Magnetic analysis; Magnetic cores; Magnetic domains; Magnetic fields; Magnetic materials; Permanent magnet motors; Permanent magnets; Stator cores;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312736

Filename

312736