Minimizing torque ripple in permanent magnet synchronous motors with polymer-bonded magnets

Author

Borghi, Carlo A. ; Casadei, Domenico ; Cristofolini, Andrea ; Fabbri, Massimo ; Serra, Giovanni

Author_Institution

Dept. of Electr. Eng., Bologna Univ., Italy

Volume

38

Issue

2

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1371

Lastpage

1377

Abstract

The paper presents a method for determining the main design parameters of a permanent magnet (PM) motor that will reduce the total torque ripple. First, the magnet arrangement is derived by one-dimensional field analysis coupled with a multiobjective minimization technique. Then, a two-dimensional model is used to further optimize the magnet arc width and minimize the cogging torque. The analysis mainly focuses on a rotor that is completely covered by the permanent magnets. In this configuration, the permanent magnets can be made from a tube of polymer-bonded magnet, and manufacture of the motor is greatly simplified. We present experimental tests of a machine manufactured on the basis of our design procedure

Keywords

brushless machines; electromagnetic fields; machine testing; permanent magnet motors; polymers; rotors; synchronous motors; torque; 1D field analysis; 2D model; brushless machines; cogging torque; design parameters; design procedure; magnet arc width; magnet arrangement; motor tests; multiobjective minimization technique; optimization methods; permanent magnet motor; permanent magnet synchronous motors; permanent magnets; polymer-bonded magnet tube; polymer-bonded magnets; rotor; torque ripple; torque ripple minimization; total torque ripple; Couplings; Forging; Magnetic analysis; Manufacturing; Permanent magnet motors; Permanent magnets; Polymers; Rotors; Synchronous motors; Torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.996027

Filename

996027