Question

Why the slots on the rotor of an induction motor are usually skewed?

Answer 1

I hope this answer will helpful to you.

Answer 2

The reason can be understood through the explanation of the process and the process is that as the power supply is connected to the stator, a rotating magnetic field is created. At the beginning of the process, the rotor and the stator have equal number of poles and a few times, the rotor and the stator can be 180 degrees apart. This results in zero torque and the rotor gets locked magnetically. This is also called cogging.

To avoid this locking of the magnet, the conductors are skewed by the stator. As a result of this, the flux lines from the stator get deviated and torque is created on the rotor bar by the resulting flux. If this would not happen, then rotor would oscillate.