Cogging Crawling effect in a 3-Phase Induction motor | Interview Question | PiSquare Academy

Описание к видео Cogging Crawling effect in a 3-Phase Induction motor | Interview Question | PiSquare Academy

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Cogging Topic starts at: 4:18
How to avoid cogging starts at: 8:37
Crawling Topic starts at: 11:30

*****Question & Answers*****
Q. What is Cogging?
A. even when full voltage is applied to the stator winding, the rotor of 3-ph cage IM fails to start. This happens when the no.of stator and rotor slots are either equal or having an integral ratio. In order to reduce/ eliminate this effect no.of slots are never be made equal to or an integral ratio.

Q.How to reduce cogging effect?
A.Cogging can also be reduced by using skewed rotor.

Q.What is Crawling?
A: It has been observed that squirrel cage type induction motor has a tendency to run at very low speed compared to its synchronous speed, this phenomenon is known as crawling. The resultant speed is nearly 1/7th of its synchronous speed.

Q.How to reduce crawling effect?
A: This effect can be reduced by providing short pitch winding or by using machine with high starting torque.

Q: Why crawling and cogging comes in squirrel cage?
A: Because, Squirrel cage rotor has low starting torque.

Faculty Name: Thotakura NSC Sekhar

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