Answer / ebrahim.p.b

it has been found that induction motors,particularly the
squirrel cage type,sometimes exhibit a tendency to run
stably at a speeds as low as one-seventh of their
synchronous speed.it is known as crawling.

Answer / hari hajare

Crawling in an induction motor is caused by low supply
voltage, high loads, development of harmonics in the rotor,
possibly even design faults. Crawling can be caused when a
small change in load results in an angular displacement of
the rotor field with respect to the stator field a bit
similar to the synchronous motor operation. The effects of
crawling can be reduced by avoiding certain combinations of
stator and rotor slots or altering the position of rotor
bars(skewing).

Answer / arif mondal

The phenomenon of 3 phase Induction motor when runs at
1/7th of its full speed constantly due to the presence of
odd harmonics (generally 5th,7th) in the line is termed as
crawling.

Answer / jai

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Answer / rajeshwar paste

The phenomena due to which motor runs at reduced speed due
to present of harmonics is called crawling.

Answer / ravish gaurav

it has beenion motar found that induction motor particularly
squirrel cage type sometimes exhibits a tendency to run
stably at speed as low as 1/7th of their synchronous
speed.This phenomenonis known as crawling of an induction motar

Answer / sreeram

Due to odd harmonics like 5th nd 7th present in rotor which has reduce the speed of IM at constant loads
which is 1 by 7th of their full load speed

Answer / aditya singh

The stable operation of induction motor near sub-synchronous speed Ns/7 is called crawling which is accompanied by much higher stator current, noise and vibration.
here Ns=asynchronous speed of induction motor

Answer / balaji

i agree wit all

Balaji TK

Answer / bhanutej

under odd harmonic that is 13th harmonic motor runs it 1/7
th of its actual speed .

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