New cogging-torque reduction method for brushless permanent-magnet motors

Author

Koh, Chang Seop ; Seol, Jin-Soo

Author_Institution

Sch. of Electr. & Comput. Eng., Chungbuk Nat. Univ., South Korea

Volume

39

Issue

6

fYear

2003

Firstpage

3503

Lastpage

3506

Abstract

We present a new design method for reducing cogging torque in brushless permanent-magnet (PM) motors. In our method, the auxiliary slots are put on the pole face of the magnetizing yoke, which results in a not fully magnetized zone (NFMZ) at the PM. Through Fourier expansion of the field and armature functions, the position and shape of the NFMZ that eliminate the cogging torque are found. In an example, we discuss the effectiveness and applicability of the new method.

Keywords

brushless DC motors; finite element analysis; machine theory; machine windings; magnetic flux; permanent magnet motors; torque; Fourier expansion; armature functions; auxiliary slots; brushless permanent-magnet motors; cogging-torque reduction method; design method; field functions; finite-element calculation; harmonic components; magnetizing yoke; not fully magnetized zone; pole face; residual magnetic flux density; spectral analysis; torque ripple; winding slots; Brushless motors; Forging; Iron; Magnetic cores; Magnetic flux; Magnetic flux density; Magnetization; Permanent magnet motors; Shape; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.819473

Filename

1252825