The WRIG is furnished with laminated stator & rotor cores with uniform slots in which 3-phase windings are placed (Fig 2.1 below). Usually, the rotor winding is connected to copper slip-rings.
Brushes on the stator gather (or transmit) the rotor currents from (to) the rotor-side static power converter. For the time being, the slip-ring–brush system resistances are lumped into rotor phase resistances,
