Noise and vibration characteristics of sub-fractional horsepower single-phase BLDC drives

Nejat Saed*, Stefan Leitner, Felix Krall, Annette Muetze

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Single-phase brushless DC (BLDC) drives are a cost-effective alternative for three-phase sub-fractional horsepower drives in automotive auxiliary applications. Inherent features of single-phase permanent magnet machines, such as high cogging torque and torque ripple, can, however, make them more audible than their three-phase counterparts. As some of these auxiliary drives are close to the passengers, where even a small amount of noise can be disturbing, the investigation into noise sources is essential to further address this challenge. In this paper, the dominant noise and vibration characteristics of single-phase BLDC machines are investigated for two different stator structures, i.e., salient-pole and claw-pole, and compared. Magnetic force density waves and finite element (FE) analyses are performed to analyze the electromagnetic forces resulting from the open-circuit condition as well as different switching strategies in the load condition. Structural analyses show that due to the mechanical structure’s lower stiffness and natural frequencies in the audible range, the example case machine with the claw-pole stator develops higher structure- and air-borne noise than the machine with the salient-pole stator.
Translated title of the contributionGeräusch- und Schwingungscharakteristika von einphasigen bürstenlosen Gleichstromkleinstantrieben
Original languageEnglish
Pages (from-to)260-270
Number of pages11
JournalElektrotechnik und Informationstechnik
Issue number2
Publication statusPublished - 1 Apr 2022


  • Noise and vibration
  • Single-phase BLDC drives
  • Automotive auxiliary drives

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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