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If there are no copper losses in the rotor then

  • If there are no copper losses in the rotor then rotor will run at synchronous speed.
  • Copper losses in the rotor are caused by the resistance of the rotor winding, which generates heat and energy loss due to the flow of current in the rotor circuit.
  • These losses cause the rotor speed to be slightly less than the synchronous speed, which is the speed at which the rotating magnetic field in the stator rotates.
  • If the rotor has no copper losses, then there will be no resistance to the flow of current in the rotor circuit, and the rotor will be able to rotate at the same speed as the rotating magnetic field in the stator, which is the synchronous speed.