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Suppose that the stator of an induction motor is connected to grid and the rotor is run faster than the synchronous speed. Now the current direction in the rotor circuit reverses because air gap flux as seen by the rotor rotates in reverse direction at slip speed. To maintain the same flux in the air gap the stator reduces its current drawn from the grid by exactly the same amount. But i still cant figure out how the energy is fed back to the supply.