Induction Machines
Consider an electric machine with six windings. Stator and rotor are of cylindrical cross-section and three windings are situated on stator while the remaining three windings are on the rotor, as shown in Fig. 1. Both stator and rotor windings are displaced in space for 120 degrees electrical. In this electromechanical converter a continual electromechanical energy conversion may take place provided that, if angular frequency of stator currents is ωs and angular frequency of rotor currents is ωr, rotor speed is ω = ω s − ω r . Note that, according to the condition of average torque existence, this...
