Minimization of torque pulsations in a trapezoidal back-EMF permanent magnet brushless DC motor

Author

Murthy, Sunil ; Derouane, Benoit ; Liu, Buyun ; Sebastian, Tomy

Author_Institution

Delphi Saginaw Steering Syst., Saginaw, MI, USA

Volume

2

fYear

1999

fDate

1999

Firstpage

1237

Abstract

This paper discusses the different methods used to reduce the torque pulsations (i.e. cogging torque and torque ripple) in a trapezoidal back-EMF permanent magnet (PM) brushless DC motor. The paper covers the design options to reduce both cogging torque and torque ripple. The effect of stator ampere-turns, the influence of rotor magnetization and the effect of the processing of electrical steel used in the fabrication of the stator on the motor torque ripple are discussed. The conclusions in the paper are supported by experimental results. A 3-phase, 18-slot, 6-pole brushless DC motor using high energy NdFeB magnets is used to illustrate the findings

Keywords

brushless DC motors; machine control; optimal control; permanent magnet motors; rotors; stators; torque control; NdFeB; cogging torque; design options; electrical steel processing; rotor magnetization; stator ampere-turns; stator fabrication; torque pulsations minimisation; torque ripple; trapezoidal back-EMF permanent magnet brushless DC motor; Brushless DC motors; DC motors; Fabrication; Forging; Magnetization; Permanent magnet motors; Rotors; Stators; Steel; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE

Conference_Location

Phoenix, AZ

ISSN

0197-2618

Print_ISBN

0-7803-5589-X

Type

conf

DOI

10.1109/IAS.1999.801661

Filename

801661