The slip speed is the difference in the speed of the rotor and the rotating magnetic field of the stator.
For induction motors, the rotor rotates at a speed less than that of rotating magnetic field, hence the magnetic field slips over the rotor. But for synchronous motors, the rotor and the magnetic field are in sync. The north pole of magnetic field strongly attracts the south pole of rotor, hence there is a strong lock between them and the magnetic field does not slip on the rotor. So their relative speed is zero. Hence slip speed is zero
For induction motors, the rotor rotates at a speed less than that of rotating magnetic field, hence the magnetic field slips over the rotor. But for synchronous motors, the rotor and the magnetic field are in sync. The north pole of magnetic field strongly attracts the south pole of rotor, hence there is a strong lock between them and the magnetic field does not slip on the rotor. So their relative speed is zero. Hence slip speed is zero
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