My questions, as stated in the title, is how does skewed conductor on the rotor of squirrel cage decreases crawling affect?
I've gone through articles in about cogging and crawling affect on induction motor, but I still don't fully understand how skewed conductor help decreases the affect of the low torque created by the 7th harmonic. The only explanation that I've found is...
"Skewing primarily helps in removing crawling phenomenon by reducing slot harmonics, as if rotor bars are skewed by such an angle where the rotor bar terminations fall under two same poles (order of harmonic X no. of poles) created by harmonic fluxes in stator and as a result production of same polarity emf takes place in the termination and they effectively gets cancelled.."
So my understanding is since slot harmonics depends on the number of rotor bars, by skewing them there is now less of the rotor bars and henced improve performance. So by doing this mechanical design, electrically we see an improvement in motor efficiency..am I on the right track?