locking of induction rotor due to tooth harmonics
(caused by specific relation between no. of stator
and rotor tooths). due to this motor fails to
rotate and can be avoided by skewing of rotors in
cage type rotors ( not a phenomonen in slipring
induction motor)
If rotor and stator slots are equal
then cogging is likely to happen.
Harmonics is the 2nd reason, you
are right.
Lastly, if rotor slots are exactly
parallel to the rotor shaft axis then also it cause
cogging. These slots or copper bars inserted in
them are angled or skewed to let the fields cut
each other. Hence torque is produced there.
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