A High-Torque Magnetless Axial-Flux Doubly Salient Machine for In-Wheel Direct Drive Applications

Author

Lee, Christopher H. T. ; Chau, K.T. ; Chunhua Liu ; Ching, T.W. ; Li, Fan

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, Hong Kong, China

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

5

Abstract

In this paper, the concept of dc-field excitation is newly incorporated into the axial-flux doubly salient (AF-DS) machine, leading to create the new magnetless AF-DSDC machine. With the external field excitation, the proposed machine not only can enjoy its improved torque density, but also the flux-weakening capability for the wide-speed range operation. With these characteristics, the AF-DSDC is favorable for the in-wheel direct drive application. In particular, the proposed machine is designed and compared based on the requirement of a typical passenger electric vehicle. To have a better illustration, a radial-flux DSDC machine is also designed under the fair environment. The corresponding performances of both machines are analyzed by using the 2-D and 3-D finite element method.

Keywords

electric drives; electric machines; electric vehicles; finite element analysis; magnetic flux; 2D finite element method; 3D finite element method; external field excitation; flux-weakening capability; high-torque magnetless axial-flux doubly salient machine; in-wheel direct drive applications; magnetless AF-DSDC machine; passenger electric vehicle; radial-flux DSDC machine; wide-speed range operation; Magnetic analysis; Magnetic flux; Materials; Stator windings; Torque; Windings; Axial-flux; dc-field excitation; doubly salient; in-wheel direct drive; magnetless machine;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2326682

Filename

6971484