what is meant by crawling??
Answers were Sorted based on User's Feedback
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.
Is This Answer Correct ? | 15 Yes | 3 No |
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).
Is This Answer Correct ? | 12 Yes | 5 No |
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.
Is This Answer Correct ? | 9 Yes | 6 No |
Answer / jai
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Is This Answer Correct ? | 3 Yes | 1 No |
Answer / rajeshwar paste
The phenomena due to which motor runs at reduced speed due
to present of harmonics is called crawling.
Is This Answer Correct ? | 8 Yes | 7 No |
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
Is This Answer Correct ? | 2 Yes | 1 No |
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
Is This Answer Correct ? | 0 Yes | 0 No |
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
Is This Answer Correct ? | 0 Yes | 1 No |
Answer / bhanutej
under odd harmonic that is 13th harmonic motor runs it 1/7
th of its actual speed .
Is This Answer Correct ? | 0 Yes | 6 No |
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