The two main groups of AC motors are induction and synchronous type. Induction type motors include single phase and three phase rotor winding. Synchronous type motors include DC self-excited and excited.
Of the types of AC motors appointed, the most used is the induction motor squirrel cage. In Figure 17 we can see the squirrel cage motor, which distinguish the stator has a three-phase winding distributed symmetrically between the grooves at an angle of 120 ° mechanical.
