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Answer Posted / romesh roy nigam
Cogging - The rotar of squirral cage motar some times
refuse to start at all,particularly when the voltage is low
this when number of rotar teeth becomes equal to numbers of
stator teeth & due to magnatic locking between stator and
rotar teeth.
Crawling - The phenomenon when squirral cage motar some
times showing tendency to run stably at speed as low as one
seventh of its synchronus speed
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