High frequency electromagnetic emissions of cylindrical laminated cores

• Stéphane Duchesne ^[1] ; J-Ph. Lecointe ^[1] ; F. Périsse ^[1] ; Ewa Napieralska-Juszczak ^[1]
  1. [1] Artois University

     Artois University

     Arrondissement d’Arras, Francia

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 27, Nº 4 (Special Issue: ISEF 2007), 2008, págs. 735-743
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • Purpose – This paper aims to propose a high‐frequency (HF) model able to compute the flux density in the vicinity of the laminated stator core of an AC machine.

    Design/methodology/approach – Experiments form the main approach. Analytical results previously obtained with a simplified rectangular laminated structure are confirmed with a standard cylindrical magnetic core.

    Findings – Three frequency domains are defined, depending on the skin depth relative to the thickness of the magnetic sheets. A methodological approach is proposed for each domain. For higher frequencies, the magnetic core can be considered as transparent for external field computation.

    Research limitations/implications – The HF model is valid for skin depths much lower than the thickness of the magnetic sheets.

    Practical implications – The proposed HF model provides a link between the weak field measured in the natural void existing between the stator core and the housing of large electrical machines. With such a link, it is possible to develop a new monitoring system able to detect and to localize the partial discharges in the stator winding of a large machine.

    Originality/value – The low‐frequency limit of the model has been measured. It corresponds to a ratio of 1/40 between the skin depth and the magnetic sheet thickness. Therefore this model offers a new perspective for maintenance applications.