As we know that Rotor Conductors of Squirrel Cage Induction Motor are skewed. It is not straight conductor as shown in figure below.

Rotor conductors are skewed because of the following reasons:
  • Primarily to prevent the Cogging Phenomenon. It is a phenomenon in which, if the rotor conductors are straight, there are chances of magnetic locking or strong coupling between Rotor & Stator.
  • To avoid Crawling. Crawling is a phenomenon where harmonic components introduces oscillations in torque.
  • Increased rotor resistance due to comparatively lengthier rotor conductor bars.
  • To improve the starting torque & starting power factor.
  • Increasing effective magnetic coupling between Stator & Rotor fluxes.

Thank you! 

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