3 Phase Inverter Basics - Working Principle

[@EngineeringMindset]

*These videos take a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@abhay8437]

Thanks, Paul! Old but gold.

[@MrSweetHart6976]

Wow I always wondered how these inverters worked, I never realized how simple of a concept they were. Thanks for the video 👍

[@dopeytripod]

...you had me at larger applications

[@CommercialGasEngineerVideos]

What would I do without this channel

[@lewisdoherty7621]

I remember seeing a much older, probably less electrically efficient solution for railroad overhead DC catenary from city power. Power from the city supply would come in and power a three phase AC motor which was attached by a shaft to a dynamo which produced DC power. I didn't see it, but I thought that the dynamo may have had three axes set at a 120° to each other to create close to a constant DC output. The locomotives and street cars use regenerative braking and sent power back into the system. A video on how all of these power surges were dealt with might be interesting. It was rush hour with fully laden cars and at the same time almost everyone slammed on their brakes without anyone drawing power from the system and then there was a really big blue flash. I know a lot of traction systems have gone to AC.

[@tomash9116]

That's what came to my mind. How much more inefficient would it be to build the 3 phase inverter by linking a DC motor mechanically to a 3 phase generator? That way, the sine waves would be produced "organically"...

[@googlesecurity6612]

Congratulations ,Indians love you dude...❤️

[@adilaziz3948]

Man i learned all of these in my Power electronics subject.

[@AASajermann]

Congrats, great video and great content on your channel.

[@squidgysailor]

Thanks, this video was so precise and lean. Does inverter always mean DC to AC?

[@djscottdog1]

I think so , my lecture referred rectifires , inverters , and dc -dc drivers, push pull drivers collectively as converters.

[@rjrich2322]

Yes of course,DC to AC.Usually used in Solar,Wind and Tidal power supplies.

[@EngineeringMindset]

Seen our new video on HOW SOLAR PANELS WORK in detail kzbin.info/www/bejne/j6nXaGWXec95nbs

[@nickayivor8432]

PRODIGY The Engineering Mindset Thanks 👍 My teacher The Engineering Mindset From Nick Ayivor from London England UK 🇬🇧

[@JaySmith91]

IGBT: Insulated-gate bipolar transistor

[@kadirbozkaya500]

Sevdiğim bir konu çok iyi anlatmışsınız

[@SwordQuake2]

Еби си майката, резак

[@joshy0369]

Nice

[@shakerileiwat4341]

👍👍👍

[@raptorthegamer5524]

One thing i dont understand is that why don't they just use a brush less motor for inverting dc to ac? I mean it will make it a lot less complex. You can just attach a magnet to the shaft of the motor and then wind three pairs of coiled wire in a circle around it, and boom! You get a three phase ac current

[@killj802]

They do, it’s called a rotary phase converter…. But it converts single phase 240 vAC to 415 vAC 3ph …. I built one to run my lathe and milling machines.

[@jessiegashler427]

Because you'd be adding unnecessary complexity to the circuit, and it would be less efficient. A BLDC is driven by essentially the same kind of circuitry that makes up an inverter to begin with. You also need to control the phase switch timing accurately, and that's done best with a set of hall sensors. It can be done by measuring back EMF, but it's not as accurate.

[@0.1lite46]

And what if you want a stable frequency on the output?

[@HN-vu8pp]

@@0.1lite46 The frequency can vary depending on the speed of the motor thus a stable frequency can be achieved, however this idea isn’t efficient since dc motors have an efficiency factor of .7 - .85 and it would often requires a lot more space.

[@0.1lite46]

@@HN-vu8pp I know and only asked this question so the commenter thinks about frequency as well, not just the basic characteristics. One of the main reasons for using inverters is that specific, stable output frequency is much easier to achieve.

[@cryora]

So what exactly is a 3 phase inverter? It looks like you get the same thing you got from the start. Is there supposed to be a 180 deg phase shift in all of the lines? Is that what is meant by inverter?

[@EngineeringMindset]

You input uncontrolled AC at a fixed frequency and voltage, convert it to clean DC, then use that to make perfect AC output of any frequency and voltage you require

[@cryora]

@@EngineeringMindset So it's like a 3 phase sine-wave generator that draws from 3 phase ac power. I'm studying for the FE exam and they have instead a sine-triangle PWM.

[@themangix357]

It's good and all, but why do stuffs require 3 Phase? Why is a normal inverter not gonna work?

[@EngineeringMindset]

More phases = more power

[@douglasharley2440]

don't understand why go from dc to ac, just to go back to dc?...seems inefficient.

[@EngineeringMindset]

Because its clean a d constant so you can do anything you want with it. If you took 50hz 230V AC you can't convert that to 300V 60HZ, the AC supply will be going into the negative half of its cycle multiple times just when you need the output to be at the maximum point of the sinewave. But, we can turn the DC into anything because it's constant so we don't have that limitation

[@douglasharley2440]

@@EngineeringMindset aha, thanks for clarifying! i guess that type of scenario is likely going to happen when you are trying to use equipment designed for one grid type on a different grid type.

[@piranha1337]

@@EngineeringMindset Thanks. The video unforunately lacks exactly this bit of information. I was like "cool now I've made AC to DC back to AC with shitty PWM 'waves' O_o"

[@shannondavies4945]

@@piranha1337 I was thinking the exact same thing. Why would you bother to do this? This video is missing the "why" you might want to do this. lol

[@NoName-ef3jq]

Why are there so many recycled videos now?

[@EngineeringMindset]

People message me so many times asking to make a video on something I already covered. They can't find the answers they need in the long form content. So, I cut the section out and post it to make it easier. This frees me up so I can make better videos, I'm also building a 2,000 sq.ft studio so that in 2023 we can publish the most amazing content and learning experiences

[@cyumadbrosummit3534]

3 phase is completely unnecessary today as nobody direct wires AC induction motors anymore in industrial settings. Everything goes through a VFD (veritable frequency drive) which determines the voltage, current and frequency to directly control motor speed, soft starting and power output.

[@LoganLeGrand]

What world are motors not wired directly to 3 phase? High pressure pumps? Hydraulics? You’re forgetting plenty of industrial applications there.

[@SwordQuake2]

Great way to piss away power... AC -> DC -> AC