The symmetric rotor cage model of this library does not consist
of rotor bars and end rings. Instead the symmetric cage is modeled
by an equivalent symmetrical winding. The rotor cage model consists
of 
phases. If the cage is modeled by equivalent stator winding
parameters, the number of effective turns, 
, has to be chosen equivalent to the effective number of stator
turns.
SinglePhaseWinding, SymmetricPolyphaseWinding, SaliencyCageWinding, RotorSaliencyAirGap