Brian Douglas
I’m writing a book on the fundamentals of control theory!
Get the book-in-progress with any contribution for my work on Patreon – https://www.patreon.com/briandouglas
In this video I explain gain and phase margins. If you are confused by this topic I hope this video will help tie all of the concepts together that go into understanding what gain and phase margins are and why they’re important.
Errata:
Nothing I know of yet! Let me know if you find anything and I’ll add it here.
Don’t forget to subscribe! I’m on Twitter @BrianBDouglas!
If you have any questions on it leave them in the comment section below or on Twitter and I’ll try my best to answer them.
I will be loading a new video whenever I can and welcome suggestions for new topics. Please leave a comment or question below and I will do my best to address it. Thanks for watching!
Source
Thank u sir for clearing the concept
excellent video
First of all thanks Brian.
I am at a exercise where the closed-loop system is labeled as unstable since the phase-margin is negative. But in my understanding, as long as the phase-margin-frequency is (~far) away from gain-margin-frequency, the openlooptransferfunction is not getting -1 and the closed loop should be (asymptotic) stable.
Where am I wrong?
Thanks for your answers in advance
You are just awesome, great explanation!
it definitely helped to clear things up a bit! Though i hoped to find analytical examples in calculating this. Because we can't use matlab on exams 🙁
I can't pass without saying "thank you". I think you are gonna save me for my System Dynamics Control exam tomorrow!
Thank You
Mate you rock! I've been able to grasp all the concepts from your videos a lot better than from my professor in almost 2 months! Thanks a lot
Amazingly explained thank you so much! I was so confused when I studied this and then I found this!
If I want to increase my phase margin to lets say 60 degrees using a proportional controller and I have a bode plot of the system, how do I find what value of K to use in order to affect this change
Some are born to teach ,you are one of them??
I am speechless 🙂
great
Everytime I search a topic in my controls class on YouTube i cross my fingers and hope there’s a Brian Douglas video lmao
You are the best!, i'm glad i found your videos
you are a genius at tying these concepts together ty ty ty ty
4:11 wow that analogy couldn't have been more perfect.
….I have found you…..sensei
People please send money to his Patreon account
you are my father
Super awesome explanation, saving me from confusion. Thanks Brian!
You are super super super awesome
Just want to let you know that you've inspired people like me to be interested in engineering
What is the phase margin of the system if the plot starts from -180 degrees and goes down from there to -200 … -300 and so on?? Here the 0 dB point is at -225 degrees!!!!
Thanks a lot!!!!!!!!!!
this man is absolotely hack
Thank you so much for this video. It makes the concept of margins so clear !
give this man a damn medal
Brian deserves the Nobel prize for teaching!
What if the magnitude does not intersect 0 db. Do we extrapolate?
This video is so revealing for the concept of why use of bode diagrams – I LIKED IT – …… thanks a lot Brian =D
one of the best videos I have ever watched to understand Bode plot
Very helpful and very well done. Thank you.
:O Excellent! You were very clear, thanks!
I think my prof is great, he knows almost all about control Engineering. But he has no clue how to teach at all.
Thanks for the video!
What is the DC gain margin?