Subject: How is Back EMF generated in a typical induction motor?

In a permanent magnet DC motor, a back EMF is generated back into the 
supply because the armature windings are spinning in a magnetic field 
supplied by the stator.

In a synchronous motor, when under load the magnets (dc or permanent 
magnets) on the rotor are out of phase with the rotating field applied by 
the stator and so induce an EMF into the stator windings and hence back 
into the supply.

In the synchronous motor, the flux needs to jump an air gap and travel 
through the stator winding to make a circuit. But in an induction motor, 
the bars are completely embedded in the rotor laminates. So how is the 
mechanical load reflected back into the supply in this case?

Re: How is Back EMF generated in a typical induction motor?