Torque Ripple and Unbalanced Magnetic Force of a BLDC Motor due to the Connecting Wire Between Slot Windings

Author

Sung, S.J. ; Jang, G.H. ; Lee, H.J.

Author_Institution

Dept. of Mech. Eng., Hanyang Univ., Seoul, South Korea

Volume

48

Issue

11

fYear

2012

Firstpage

3319

Lastpage

3322

Abstract

In this research, the effect of the connecting wire between slot windings on the torque ripple and unbalanced magnetic force (UMF) of a brushless dc (BLDC) motor was investigated. A 2-dimensional finite element model of a BLDC motor that includes the effect of the connecting wires was also developed. It was found that the connecting wires generate pole harmonics in the torque ripple and UMF. Thus, a novel pattern of the connecting wire where all coils are located at rotationally symmetric positions is proposed in order to eliminate the pole harmonics of the torque ripple and UMF induced by the connecting wire. The experimental findings showed that the proposed pattern can effectively reduce the magnitude of the pole harmonics in the noise and vibration of a BLDC motor.

Keywords

brushless DC motors; finite element analysis; harmonic generation; machine windings; magnetic forces; torque; vibrations; wires (electric); 2-dimensional finite element model; BLDC motor; UMF; brushless DC motor; pole harmonic elimination; pole harmonic generation; rotationally symmetric position; slot winding; torque ripple; unbalanced magnetic force; vibration; wire connection; Brushless DC motors; Harmonic analysis; Joining processes; Torque; Vibrations; Windings; Wires; Brushless dc (BLDC) motor; connecting wire; slot windings; torque ripple; unbalanced magnetic force;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2198879

Filename

6332764