The crawling in the induction motor is caused by____________?
Correct answer: C. harmonics develped in the motor
- A. low voltage supply
- B. high loads
- C. harmonics develped in the motor
- D. improper design of the machine
- E. none of the above
Explanation
Crawling is caused by harmonic torque, especially the seventh space harmonic, which can produce a low-speed torque near one-seventh of synchronous speed. Low voltage or heavy load may worsen operation but does not cause the phenomenon.
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