I see, if only my course taught me this stuff. Basically the frequency step is too large to resolve the exact frequency. I think that if this course was worth it's salt it would include lessons on the proper tools like matlab instead of trying to short cut it by hacking about with excel. I expect the fourier analysis was put into excel to keep the stock brokers hayy rather than the engineers.
Well yes as the preamble to these questions state that its' the current waveform of a VFD I guess they might just have a 50Hz supply Thank you for your efforts
If you have not seen this video, it is really worth watching, and then many others by the same producer.
I have only ever had a general understanding of Fourier transforms (never needed to use them), and the explanation given in this video is a revelation. Those of us that grew up with books have always thought they were the way to learn, but this really shows how to use video content to go beyond what books can do!
https://youtu.be/spUNpyF58BY
I see, if only my course taught me this stuff. Basically the frequency step is too large to resolve the exact frequency. I think that if this course was worth it's salt it would include lessons on the proper tools like matlab instead of trying to short cut it by hacking about with excel. I expect the fourier analysis was put into excel to keep the stock brokers hayy rather than the engineers.
The Fourier transform goes back to 1810 although some of the mathematical details were not resolved until almost 100 years later. The major work on the discrete case was done in the 30's by Wiener and Shannon. So the age of the material is not an issue. Quality of instruction is.
If you're spending money on this I strongly urge you to look elsewhere if those things were not done. Such instruction is worse than useless, it misleads the student.
Your courses are causing many of us to look back at things we might have known - four or more decades ago. As well, we are looking at the new tools (Maxima, Octave, Matlab) and learning how much easier these problems are when using a computer as opposed to a slide rule.
I look forward to your homework problems. They are helping me fill in some blanks.
So attached is the monkey see monkey do version. Next I will try the same with the corrected frequencies on a 50Hz fundamental.
Blue is using sine on the real parts, green is using cosine on the real parts, the blue seems to be right but out of phase
Yes I have seen that one, no math content but an interesting look
Sorry for
You have to get in and start crunching numbers for yourself - just like people have done in this thread. We weren't even doing the course, but we had some fun. Build and test circuits. Every time you go into areas like Fourier Transforms, Laplace Transforms, Maxwell's Equations, Classical Filter theory, Bode plots and stability, Semiconductor Theory and so on it gives a new perspective to your understanding so you can start to see how electronics is working from new directions.
Yes I have seen that one, no math content but an interesting look
When you say "no math content" I am very much afraid you have missed the point.
For me, watching that video I saw 100% maths content. Maths is all about the concepts and ideas and how they lead to deeper insights. If you think of maths as equations, you are in danger of seeing engineering as lathes and drills instead of the products they produce.