The purpose of skewing of rotor slots in an induction motor is

• A. To reduce the magnetic hum of the motor
• B. To increase the breadth factor
• C. To reduce the locking tendency of the rotor
• D. To increase the distributuion factor

Answer: (C)

For reduction of harmonics method is given below:
Chording
integral slot winding
skewing
larger air gap
Sr≠Ss : avoid cogging
Sr-Ss≠P,2P,5P avoid synchronous cusps
Sr -Ss ≠ 3P avoid magnetic locking
here, Sr is number of rotor slot, Ss is number of stator slot