Cogging Crawling effect in a 3-Phase Induction motor | Interview Question | PiSquare Academy
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- Опубликовано: 28 авг 2024
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Cogging Topic starts at: 4:18
How to avoid cogging starts at: 8:37
Crawling Topic starts at: 11:30
*****Question & Answers*****
Q. What is Cogging?
A. even when full voltage is applied to the stator winding, the rotor of 3-ph cage IM fails to start. This happens when the no.of stator and rotor slots are either equal or having an integral ratio. In order to reduce/ eliminate this effect no.of slots are never be made equal to or an integral ratio.
Q.How to reduce cogging effect?
A.Cogging can also be reduced by using skewed rotor.
Q.What is Crawling?
A: It has been observed that squirrel cage type induction motor has a tendency to run at very low speed compared to its synchronous speed, this phenomenon is known as crawling. The resultant speed is nearly 1/7th of its synchronous speed.
Q.How to reduce crawling effect?
A: This effect can be reduced by providing short pitch winding or by using machine with high starting torque.
Q: Why crawling and cogging comes in squirrel cage?
A: Because, Squirrel cage rotor has low starting torque.
Faculty Name: Thotakura NSC Sekhar
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Definitely....🙏
Please upload braking methods of im
How to reduce crawling in IM...Pls explaine sir
Not only great presentation... also his knowledge n how simply he conveys it... simply superb
I have been watching your channel for long time...lot of changes in teaching method...Great effort man...students really want this type of teaching staff...Animated videos can easily make a better understanding to students...don't worry about the likes and subscribers...it's a great privilege for you if one student get use of your video
Thank you. Keep sharing
Brilliant sir 👍👌👌👌, thanks for clearing these concept
One of the best RUclips channel
Please put more videos. Explanations are awesome.
Sir please upload a lecture on working principle and construction of synchronous machine, induction machine,dc machine ,transfomer etc.
These basic topics are not coverd by anone in a decent way.
Thank you sir to clear our basic doubts.
Sir please complete machines and power systems as soon as possible this is my request thank u for valuable video's
Sir it’s really great video .. can you plz make video on a speed control of induction motor it’s really helpful for us . Thank you 🙏
sir please make videos on single phase im,three phase IM, and other machines.sir your explanation is excellent.
Very excellent explanation . Now this topic has become easy to understand for everyone.
Thanks a lot for making this excellent lecture.
Mr. Manjeet, Thank you stay tuned to our channel for more such videos, the more you Share these free lectures "more we Upload". For every 100 clicks on share we will upload a new interesting lecture.
Believe me sir , whatever problem u r facing , upload videos on time basis , ur channel will rock🔥🔥🔥🔥
Sure Aditya, Thank you for your valuable feedback.
Thank you sir, very helpful
Sir, u just explain terrifically, hat's off to you.
Realllyy really interesting explaination sir, thank you.
Awesome Explanation sir. We need more videos in that subject.
very informative
Sir,your explanation is unique,& understandable too ....thanks for giving interest on more electrical subject
Great lecture sir
sir it was really amaging......thanks a lot of sir. may god bless you .
Amazing...Excellent explanation!
Great explanation sir really awesome
Best teaching in small time very visualise explanation compared to nptel you will be most better
Sir ,Please make videos on power system and switchgear because the way u explain through animation is very easy to digest.
Sir please tell me about torque speed characteristics of 3 phase induction motor
Very good way to explanation 👍
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Sir... your explanation is really awesome.. At present I am studying AMIE.... so i need online coaching classes...... please tell...your opinion or give suggestion to pass
bhai AMIE valid hai AICTE se ?
Nhi hai bekar university
After a long time.....nice way of teaching
You great sir,please sir power system circuit breakar se bhi related video bana dijie....
Super explanation 🔥👌
Well done !!
Very BIG LIKE from me.
Awesome👍👍 explanation sir thank you so much 👌👌👌
But please remove this type of advertise they are also disturb us😠😠
Sure :) thanks for the feedback
Thank you
Sir... Ur explanation is really awesome..
Nw I will neva forget cogging and crawling effect
Thank you stay tuned to our channel for more such videos, the more you Share these free lectures "more we Upload". For every 100 clicks on share we will upload a new interesting lecture.
Easy to understand video...well explained!!
Well explained
So, is cogging a running phenomena, or is it mostly a start up phenomena? And is cogging an issue if the motor has a flywheel attached? Like a phonograph motor for example.
I am trying to explain how a 16/12 ratio BLDC motor works and if cogging is even an issue when there is a 4 pound platter/flywheel attached.
Sir Aapne last me Bola due to 5th harmonic it will rotate less speed than synchronous speed but uski rotate hone ki direction kesi hogi seventh harmonic jesi same?
Best teaching Sir hands up sir
thank you dear chitaranjan
sir please explain armature reaction in synchronous machines
Nice explaination.
Thank you Sir
Very nice Sir 👍🙏
very good video, thank you very much
Sir plz upload a video on the
CIRCLE DIAGRAM OF 3 PHASE INDUCTION MOTOR
plz sir quick upload this video.😊😊❤️
Bahot badiya
Very good Explanation sir
Is load torque is the inertia of the external load which we connect to the output shaft of the rotor plz tell I am getting confused on load torque
Great sir ❤️
Ur description is awesome sir
What would happen if an electric power distribution line wire falls into a river??
thank you sir... explanation is very good and helpful
Sir. Good explanation. But have two doubts. Firstly, why 5th harmonic has been considered in braking region. Secondly, how 5th harmonic drives opposite to 1st and 7th harmonic.
The torque developed by the synchronous motor at start when rated voltage is applied to the stator is known as
A) Locked rotor torque
B) Pull in torque
C) Pull out torque
D) Running torque
Please reply sir with answer
Dear follower, option A could be the only possible answer. B, C, D can never be correct answer.
PiSquare Academy but sir at locked rotor torque motor can never start
Cogging will not affect already running motor it should be consider during manufacturing only am i right?
Can we reduced the crawling by screwing the conductors of rotor and how can it do ?
Wowwww great explanation sir🔥🔥
Nice Sir👍👍
in depth lecture thank u sir
Thank u sir you are awesome plz more video for your students thank u
😍😍♥️♥️👌👌👌🤐 no words... Peaks
Thank you sir
Very nice explanation sir keep it up and make new video
excellent explanation
Hello sir ,Please tell us how we calculate fuse ,cable, contractor size for any motor or transformer load ,and how we calculate DG set for given load and transformers for any given load
Thank you
Sir plz make a video on y synchronous machines becomes unstable for Delta greater. Than 90 degrees in same animation way n y in synchronous generator stator field lags rotor field n in synchronous motor y opposite happens
Thanks
Super sir very nice explanation
Very helpful vedio Sir!
Thank you so much!
Thank you stay tuned to our channel for more such videos, the more you Share these free lectures "more we Upload". For every 100 clicks on share we will upload a new interesting lecture.
Check our other lectures and subscribe to get alerts on new uploads at
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You are great sir♥️♥️
Sir please start classes for junior. Engineer and assistant engineer competitive exams
Thanks sir super explaination
thank u bro i am looking for this video only
Vi... Sahi ha... Nice production...
Thank u sir
Exellent!
sir complete synchronous and induction machine
Very nice sir thank you....
After reaching the maximum driving torque in torque speed curve why the driving torque decreases if we further increase the rotor speed plz explain
after that instant the value of slip is low and torque will be directly propotional to slip which means torque is inversely proportional to rotor speed..
Do more videos sir very helpfull
Great explained... But sir you don't told us how to avoid crawling effect ?
Please check the video description for the answer. I hope it will help you
If load torque is 8.5 and alignment torque is 1.5 it means total torque which is trying to resist the motion of rotor is 10 and also driving electrical torque is 10 so the machines will not rotate or rotate...?
Superb sir
Sir, why does it only occur in Induction Motor?
how does reluctance motor runs?
continue ur lecture series sir
Sir please put the video related to stability🙏🙏🙏
Why allignment torque different directions and cancel is each other
Thank you sir. But how can we reduce or eliminate the crawling effect would you please explain sir
It can't be eliminated but can be reduced by using short pitched winding ...
Thank You Sir!!!
Nice! try to reduce the introductin time... keep the good work... cut the wasted times! thanks!
We kept the intro to give a sneak peek of the whole lecture :)
thanks Mr .
Thankyu sir but. I still have a doubt the mmf present in air is rotating in nature so it keeps on rotating and it is also locked with rotor teeth so will it not try to rotate the rotor with synchronus speed jusk like in case of synchronus motor .. please help me with ur answer . I m very confused with this
Sir how the direction of alignment torque is determined i think the alignment torque doesn't allow the rotor to rotate
Please answer
Hi sir in the above video what if the ratio of slots is ensured non-integral value and still load and driving torques are equal, motor starts accelerating??
Sir plz make synchronous machine load torque nd main torque both in motor nd generator case
Thanks a lot..
thank u sooo much sir
Sir deep bar rotor?
why don't we consider 3rd harmonics in crawling effect
Sir, what will happen if the capacitor of a single phase induction motor is replaced by a inductor?