[Unlisted] Why 3 Phase AC instead of Single Phase???

"Economic studies have shown that DC overhead transmission is more economical than AC transmission for longer distances", page 4, Power System Analysis, by Grainger. How do you reconcile this with the contents in this video?

Is Electrocutie going to release an album?

Thanks for the informative video, it sparked me to look further into power factor. Is there any chance we could see a power factor video eventually?

Brian Botterill

3phase makes so much more sense. Thank you

I have 380V 3-phase AC in my house. Didn't knew about brushless DC, thank you Mehdi!

Thank you for this. Watching YT for a few years and recently told by my server co-location provider that I'm going to 2 phase AC 240V. This explains much! Now I'm a patreon subscriber.

I never really know what was 3 phase AC, let alone motors. Cool stuff!

I love hearing stories about Tesla and Edison's rivalry. A lot of there theories on electricity that are always told comes out tge light. Ooooh, I wonder what light theories there are and not told yet. However, and more importantly, I can get a ton of use out of a 3D printer. Hey Mehdi!!!! I want that printer, pleeeaaaase.

This is neat! I looked up more on multi-phase AC and saw that there's also 6 and 12 phase AC as well (and even higher than that), even though it's costly for little gain. How would you be able to wrangle more phases from a homemade setup like the motors?

Dieting Hippo

You can actually get a couple of amps from them if you turn fast enough

ElectroBOOM [Mehdi Sadaghdar]

What voltage (& I guess current) can you get out of one of those little BLDC drone motors? Wondering if there's enough to build micro wind turbines......

May I please one of this 3D printer? Thank you 😁 Regards from Poland!

Gimme da printer!! Great Vid. Thank you!

TGBO

I've worked with electronics for 30 years and this finally explained 3 phase well enough for me to "get it."

I always was under the impression that 3 phase would kill you, but I doubt those small motors would even cause a shock to you?

very informative! thank-you

I didn't know that Canada used 2 phases. That was interesting. Here in America, we typically just have the two lines from the secondary of the step down transformer and the neutral is just a center tap. This is the first legit use of the removable tabs on that Edison plug I've seen. Speaking of which, if it was Tesla who pushed for AC, why do we call wall plugs Edisons in the first place? We should call them Teslas.

Awesome video. I was just schooled!!!!

Ron Kroetz

Chorus Motors claims they have an 18 phase motor. <a href="http://slideplayer.com/slide/4155310/" rel="nofollow noopener" target="_blank">http://slideplayer.com/slide/4155310/</a>

Great Video! I have been in the market for a 3D printer - I have been leaning toward the Creality3D CR-10 series.

Ultranicce content!! Luzluz... XD

my standard tungsten light bulb run by 3 phase system, so bright than my future...

harinyan

Great video as always, now please, gimme da printa!

some ESC burn up if you power them up without a load.. what to explain why?

lesto

The spinning coaster was so mesmerizing... Kinda like the unibrow.

Understanding the freaking 3phase motor was, as we say here, "una rayada"

Now give me THA PRINTARRRRRR

Great content. Wish your videos were available when I was a EE student :-)

Is there any way to phase shift the outputs of a transformer with 3 isolated windings? I have a 15kva isolation transformer with multiple outputs that would like to know... It wont stop asking... Please help, it has started to threaten my family with its 60hz growl.

Adam Nash

Gimme da printer keep up the good work medhi

you better bloody pass it now!!!!

Preet S

Lol i have a quiz on this subject tomorrow

Yousef rawas

Gimmi da LULZBOT, ..... PLEASE, ... cause I don't have one (at all). ... Brill video, (as usual)

R/C motors use permanent magnets, making them synchronous motor which is almost the same as synchronous generator

Thomas Eriksen

Induction motors are not supposed to work as generators. That's what I was taught anyway. So how the heck did you get a current out of there? Is the remaining magnetisation enough to kickstart the electric generation? :O

Depending on where you live, you should be able to ask the city to connect 3 phases for you, I think!

ElectroBOOM [Mehdi Sadaghdar]

Google has been my school for a long time now!

ElectroBOOM [Mehdi Sadaghdar]

Because the phases are 120 degrees apart from each other but at the same frequency, the difference in potential between any 2 phases is constant, hence why the constant power. As to why the 0 current, it has to do with vectors. If you had two phases that were 180 degrees apart from each other, their value added together would be 0, because they would be equally positive and negative at every point in the sine wave. With 1 phase being 120 degrees in one direction to one of its neighbors, and 120 degrees the OTHER way to the second neighbor, the effect of the two neighbors adds up to roughly the equivalent of a theoretical phase that's 180 degrees different. It comes down to vectors and a bit of math, that would make a great Numberphile video perhaps. It's difficult to explain in just words, you need better diagrams to fully show the maths.

Dustin

Filled in a lot of blanks for me! Great video. Thank you!

I don't have a printer yet (hint hint!!!!) but my friend uses glue sicks to make the print stay down at the start and it frees from the plate very easily at the end.

Preet S

Hi Mehdi, What a wonderful explanation of why we use 3 phase distributions but I'm still confused by the how. Why is it at the there is no current return path? Where does the current through the loads go? Something isn't clicking with me. We use these to transfer power but if the current is 0 then so is the power. I suspect the answer is to with the frequency but I can't see it.

Preet S

Great way to remove prints... dental floss. Work the floss back and forth and no damage :)

I'm trying to look into what it would take to get 3-phase in my home. I'm building a machine shop in my basement, and 3-phase would really facilitate things. I know, there are magical Chinese boxes that convert my power into 3-phase, but still.

Paul Grodt

Whoa this is really cool! Makes me feel proud to choose ECE as my major, can't wait to learn more about this. Do you have any book suggestions or tips for studying the programming and engineering courses to come?

Maxximooose

I've been waiting for this topic. thx! &lt;3

Ando Nel

Whoa same here!

Maxximooose

It is possible to obtain 240V in some location. Distribution transformers in those area provide 120V in two opposite phase by converting the kV coming from one of the three phase of a bigger transformer. What about the delta configuration: also important (they are variations with combination of the Wye and the Delta, it depends from some conditions).

I even have 3 phases at home to power my stovetops + oven on 16A breakers (11.6kW), with the main breakers at 25A. Feels quite absurd, as the highest I've seen my whole home draw power was just over 8kW.

Luit van Drongelen

Well... now you're getting into things I know about... R/C motors and ESC.. woot!

Joseph Brzezinski

Hey! You got the same tee-shirt as I do! What a coincidence!

They make sure the phases are distributed to equal number of homes. For example if there are 1000 houses on each phase, they are statistically very close. Of course there will be some allowable imbalance which in many cases returns through ground (I've been zapped with too much imbalance!) Or just a thin wire on transmission lines for neutral return. The imbalance current is very small compared to actual load power

ElectroBOOM [Mehdi Sadaghdar]

Great video as always