The 'cogging' of an induction motor can be avoided by____________?
Correct answer: D. having number of rotor slots more or less than the number of stator slots (not equal)
- A. proper ventilation
- B. using DOL starter
- C. auto-transformer starter
- D. having number of rotor slots more or less than the number of stator slots (not equal)
Explanation
Cogging occurs when stator and rotor teeth have equal or suitably related slot numbers and magnetically lock together. Choosing unequal, properly designed slot numbers prevents this tooth-locking effect.
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