Electromagnetic noise radiated by brushless permanent magnet DC drives

Author

Zhu, Z.Q. ; Howe, D.

Author_Institution

Sheffield Univ., UK

fYear

1993

fDate

8-10 Sep 1993

Firstpage

606

Lastpage

611

Abstract

The paper describes an investigation into the electromagnetic noise radiated by a brushless permanent magnet DC drive, based on analytical techniques for predicting the electromagnetic, vibrational, and acoustic behaviour. Theoretical and experimental investigations are carried out on a 4-pole, 12-slot, 3-phase, surface-mounted magnet brushless DC motor, for which instantaneous open circuit, armature reaction and resultant airgap field distributions are computed and compared with corresponding finite element predictions. The effect of frame overhang as well as the end shields on the natural frequencies of the stator are investigated, and predicted dominant components of acoustic power radiated by the motor are validated against measurements made in an anechoic chamber. Finally, the effects of asymmetry in the magnetisation of the rotor magnets and/or rotor eccentricity on the noise radiation are investigated

Keywords

DC motors; acoustic noise; electric drives; electromagnetic interference; finite element analysis; machine testing; machine theory; permanent magnet motors; vibrations; EMI; FEM; acoustics; airgap field distributions; anechoic chamber; armature reaction; asymmetry; brushless permanent magnet DC drives; eccentricity; electric motors; electromagnetic noise; end shields; frame overhang; machine testing; machine theory; magnetisation; open circuit; rotor magnets; stator; vibrations;

fLanguage

English

Publisher

iet

Conference_Titel

Electrical Machines and Drives, 1993. Sixth International Conference on (Conf. Publ. No. 376)

Conference_Location

Oxford

Print_ISBN

0-85296-596-6

Type

conf

Filename

253510