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
Creating descriptive categories and file names for the
documents on
your website can not only help you keep your site better
organized,
but it could also lead to better crawling of your documents by
search engines. Also, it can create easier, "friendlier"
URLs for those
that want to link to your content. Visitors may be
intimidated by
extremely long and cryptic URLs that contain few
recognizable words.
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 |
WHAT IS THE MEANING OG (li = 7 In)
why are the transmission lines operated at 220 kv nly... nt les dan dat...
what is the principle of switch gear? where its function ?
i am electrical engineer i cant get job in pure electrical industry ,but i got job in instrumentation field whether there is good scope for me, as i am fresher i m not well with the industrial trends so any experienced engineer pls reply me
if a 3phase 100kva distribution transformer , 400 v,50 hz, 4-wire system is loaded at 160 k.w mostly 1-phase Lighting & Airconditioning split a.c load what will be the net effect on the power system in terms of voltage, powerfactor, current , efficiency of xformer
Meggering minimum acceptable Ohms for insulation resistance.
What is meant by Im=30mA@Vk/2. How to know the kee point voltage for CT design
Name two low frequency oscillators?
What is SF6 Circuit Breaker?
in 6.6 kv vaccum circuit breaker vaccum bottole vaccum capacity ????
I want to know Electrical Circuit?
Essential condition for parallel operation of two single phase transformer is that they should have same A polarity B kVA rating C voltage ratio D % impedance