Practical model of the axial magnetic field in the end region of large turbo-generators

Cristian Demian ^[1] ; Raphael Romary ^[1] ; Gilles Vogt ^[1] ; Valentin Costan ^[2]
1. [1] Artois University
  
  Artois University
  
  Arrondissement d’Arras, Francia
2. [2] EDF R and D, Francia
Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 38, Nº 4, 2019, págs. 1295-1305
Idioma: inglés
Enlaces
- Texto completo
Resumen
- Purpose – The axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and thus stator faults.
  
  Design/methodology/approach – It is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine.
  
  Findings – The authors provide a practical model of the axial magnetic field based on a simplified vector diagram. The parameters required to build the vector composition of the flux densities are assessed with a limited number of finite element method simulations of the whole end-region of the machine. These simulations were validated by an experimental test on a real turbo-generator. Then the axial flux density was .simply estimated for various operating points Originality/value – The originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram.