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what happens to the water pump if ground water level is slowly decreasing?our water pump is varying from no-load full-load due to this problem

 Electrical Engineering 1623



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Question { DAE, 4278 }

What is cogging and crawling phenomenon in motor.


Answer

Cogging:the tendency of locking of rotor with the stator poles when they have equal slots or any similarities between the slots is called cogging
Crawling:the tendency of rotor to rotate at a low speed equal to the seventh space harmonic i.e Ns/7 if there are considerable amount of harmonics is called crawling

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