Numerical analysis by current flow of mechanical components in double-fed asynchronous generators in wind turbines

Abstract

The mechanical components consist of the slip ring system. This system is used in double-fed asynchronous generators in wind turbines and consists of graphite brushes and slip rings. The obtained rotor current flows between the graphite-brushes and the slip rings, passing through a frequency converter into the electrical grid. While transmitting power-micro brush fires hazard in the area of contact is often present. This is caused by the separation of contact components. This phenomenon is largely influenced by the electromagnetic forces, the radial eccentricity and the electro-hydrodynamic and mechanical forces. In this paper, the nonlinear characteristics of transient behaviors between the graphite-brushes and the slip rings will be analyzed. Using ANSYS software combined with Workbench, a finite element model (FEM) of the contact problem is established and simulated.