If an induction machine is run at above the synchronous speed it acts as
If an induction machine is run at above the synchronous speed it acts as Induction Generator.
When an induction machine is operated as a motor, it operates at a speed slightly below the synchronous speed, and the slip between the rotor speed and the synchronous speed produces the torque required to drive the load.
If the rotor of an induction machine is driven at a speed above its synchronous speed, the slip becomes negative, which means that the rotor speed is greater than the speed of the rotating magnetic field produced by the stator winding.
In this case, the machine operates as an induction generator, converting mechanical energy into electrical energy.