When a 3-phase supply is given to the squirrel cage induction motor and there is a automatic pole formation is occurred. The formation of poles both on rotor and stator are same, the magnetic locking(cogging) is take place between the rotor and stator.for eliminating the magnetic locking between these we are must able to skewed the rotor slots up to desired level by doing this process also increase the starting torque of squirrel cage induction motor. In slip-ring motor we can not use skewed slots because the poles on the rotor and stator are not equal and also high starting torque.
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