Lec-37 The Nyquist Stability Criterion and Stability Margins (Contd.)

[@har89sha]

Thank you so much Sir, First 5 mins of your lecture cleared doubts I had from months.

[@gourabpaul7071]

Sir your lecture was superb thanks a lot to nptel for organizing video lectures by top teachers in our country

[@ajayprajapati2453]

best professor in India for control!!!!!!!!

[@omarnaifar3512]

From Tunisia, Thank you Sir

[@arohisingh1045]

Best lecture .... May you live long sir ... God bless you ..

[@user-in4sg1nt4t]

I am glad to attend this precious lecture..thank you sir

[@Jonathan-xe4ec]

This lecture is actually making my own professors who taught me this subject look puny.

[@biniamabera8498]

awesome,,,,,,,,,,,,,,,,,,,,,,thank u sir from Ethiopia

[@ahmadwalid4200]

a lot of thank from Jordan ☺😊☺👌👍

[@vatsal888]

Why we need to multiply system's gain by 1/a ?? I understood what gain margin means but for that why we are multiplying by 1/a??

[@shekarkofi6131]

if u multiply a*(1/a)=1 that is in cascade with gain 1/a gives the value of gain 1

[@muralidhar40]

Let’s say X-intercept of polar plot = -a. To make it -1, the original Open loop TF shud b multiplied by 1/a so that X interception is -1.

[@engmustafa982]

Many thanks from Iraq

[@sumitdeswal2008]

bravo!!! awesome lecture sir thanx

[@swethajan]

awesome lecture sir!!!!thanks a lot!!!

[@MrNaishadh]

Thanx Sir..!! Gr8 lecture

[@kanupriyajain592]

can't thank you enough! :)

[@shinjones7490]

I think , Phase Margin =180 degree Because in simple words phase Margin mins how much u can rotate your graph to touch -1 on real axis. Another way to check, Let's add a gain, k= -1 You can realise , the graph is touching -1 point . And, -1=1e^j180 So, phase Margin= -180 degree

[@muralidhar40]

Sir didn’t explain why phase cross over freq shud b greater than gain crossover freq for stability.

[@tejdalwadi5699]

We need postive phase nd gain margin so from bode plot we see phase cross over freq should be greater than gain cross over freq

[@ranjeet4u2c]

thnx sir..i had very clear concept now...

[@leakedazaz]

The lecture was awesome but I need to know the name of that opening music.

[@Jonathan-xe4ec]

Darude Sandstorm

[@TotanDas1991]

Thanks, Sir.

[@darkcow2]

Love it, thanks!

[@saylisful]

thank you sir!!!!!

[@rekhameena834]

thank u sir..

[@morakolla]

thanks a lot

[@abdulmajeedmohameed949]

From sudan thank you sir

[@asadshaikh8983]

thank u :)

[@Jonathan-xe4ec]

Awesome lecture