VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • An experimental investigation of the magnetic and brush-commutator noise radiated by a DC electric motor
    Furlan, Martin ; Boltežar, Miha ; Kuhelj, Anton, 1934-2014
    Identification and evaluation of the noise sources in a DC electric motor were carried out by means of sound intensity measurements. Magnetic and brush-commutator noise were found to dominate over ... other sources. As both magnetic and brush-commutator noise occur at the same frequency, operation of a detached DC electric motor was necessary. Comparison between the sound power spectra during normal operations and detached operations, when electromagnetic influences or brushes were excluded, enabled us to evaluate the magnetic and brush-commutator noise. The whole analysis was performed under several loading conditions so that the influence of loading on the magnetic and brush-commutator noise was quantified in term of sound power level. It was found that the magnetic noise was much larger than the brush-commutator noise at the nominal load and increased with loading. In contrast, the brush-commutator noise decreased with load and was only slightly larger than the magnetic noise during unloaded operation. Since the magnetic noise dominates during normal operation, modifications to reduce the magnetic noise, such as rotor skewing, pole shoe skewing and increasing the stator stiffness were applied to the DC electric motor. The prototype developed with rotor skewing gave a noise reduction of 3.5 dBA for the total noise, and 6.4 dBA for the magnetic noise.
    Vir: Ciência & engenharia = Science & engineering journal : revista de ciências exatas e tecnologia. - ISSN 0103-944X (Vol. 10, no. 1, 2001, str. 38-43)
    Vrsta gradiva - članek, sestavni del
    Leto - 2001
    Jezik - angleški
    COBISS.SI-ID - 4689947

Vnos na polico