In squirrel cage induction motor some times the rotor and stator care teeth or slots are comes face to face or parallel at stationary condition. If we are starting the motor at this condition the motor get hesitated to start or run due to the attraction developed between those rotor and stator teeth or slots. This is known as the magnetic locking or cogging effect of a squirrel cage induction motor. This type of magnetic locking in squirrel cage induction motor can be avoided either by skewing the rotor slot or by selecting the rotor slot, such that there is no common factor between the rotor slot and stator slots.