I am concerned for your projects that you qualified as an electrical engineer and didn’t understand a basic motor starter until watching a RUclips video 🤣
A picture will always be worth more than a thousand words. If educators all over the world would explain math and engineering using clever animations like these ones, the rate of basic understanding and academic success would rise significantly in schools of all levels.
As an Industrial Electrician, now retired, I learned this starter application many years ago during my apprentice training. Your video should make this very easy and clear for young guys starting out in this trade. Excellent job.
The weird and sad reality of the world is that most teachers are bad at explaining things. One of those things that should have been corrected for better efficiency, but strangely isn't. They don't understand what we don't understand. Understanding is hard - it should be a field of art in itself.
Interesting video. Now it's time for a part two to explain what's missing on the contactor depicted on the left and why it's essential to physically interlock the contactors. Keep at it, you're most of the way there.
Awesome explanation sir. Thank you. I am electrical Engineer myself during 1987-1991, during this period I use to study through text books only. Thanks to the computer animation, even a layman can understand the concept.
It’s a nice technician level instructional video. This is basic information on how a star-delta starter (or delta-wye starter) is wired. Presumably this leads to being able to troibleshoot one that isn’t working or replacing the motor with one with an unexpected terminal configuration. Don’t expect to get anywhere as an EE in an electric machines course based on this much information. Even if you confine the topic to 3 phase squirrel cage induction motors an EE also needs to be able to refer the rotor schematic to the line side, understand why the rotor bars are skewed, understand how what this video identifies as the “stator” is wound and why, understand how to limit or prevent stray current through the bearings, understand how to calculate the slip rate, starting torque, running torque and breakdown torque, understand break before make vs make before break, the difference between a contactor and a relay... and whatever else your professor introduces during this basic topic because it prepares you for more complex machines like motors / alternators with wound synchronous rotors / exciters.
Bro I have seen tons of videos and even went to school for this. Your video is more valuable than all previous resources I have encountered. Great job man.
Most people probably wondered how in the world you go from star to delta without opening up the box and manually arrange the connections. Also, how the contactors start from one setting to the next. Well, this video answers those questions very well.
That was amazing... I mean really amazing.. During all my study and career I knew the motors draw huge starting current but never knew why they do so.. Thanks to you...
Excellent narration and explanation. For a Mechanical engineer to understand the intricacies of 3 Ph AC motors, this video was just superb, fantastic. Thanks & Congratulations.
I really like this video. It gave a easy to understand explanation on the star-delta configuration. I feel like others try to over complicate stuff to make themselves feel smart or they just don't know how explain things very well.
The best Engineering and scientific channel on RUclips! Thank you for amazing videos: It will not be necessary for future generation to be oriented on books.
BEST EXPLANATION EVER! What caught my attention was the lack of over information, It has just the mainly and essential topics. Congratulations for this work!
When you guys find time maybe you can delve into all of the different types of AC and DC electric motors how they start and operate. Their torque an induction characteristics etc, etc
As say honestly. By watching this vedio i actually understand whts the difference of star and delta connection and how it can identify. .thank you...for making this vedio...
Don't know if this channel is still up but Big Thanks this puts me in a great position now in 2022. Going into motors now in school .. instructor is Not diving deep enough . So I have to get how You live and that's On the Come Up✌️
Somewhat made easy to understand star & delta configurations ,basic terminal connections,starter info mostly for a fresher candidates who are interested in core and technical field.Hope to come up with these basic videos mostly
Anyone who loves motors, transformers and anything electric has found heaven.. Great work here Learn Engineering.. Also, Nikola Tesla was 100 years ahead of his time. Founding father of 3 phase alternating current that will be in use until the end of time.
@@aymankamel7139 Usually called the main contactor which carries the motor over load connection.I have always seen it done with three.Looking at his diagram he as missed out showing the cables bridging across the top of the star contactor without which the coils are open circuit and nothing would happen. Apart from that it all seems ok to me and does save the cost of the third contactor, as long as all interlocks are connected [ to stop both contactors operating at the same time] and the overloads are fitted it seems a good way of doing it. A different way of doing the same thing ,good to know.
The video explains the operation of the induction motor with very good animations. Y-Delta starting is also explained well, but the usual misapplication in practice is not mentioned. It is wrong to apply this method at a 400V (line-line) network to a motor whose rating is 230V for each phase. Because such a motor should be used at a 400V network if Y-connected, and at 230V (line-line) if delta-connected. Since most networks' line-line rating is 400V in Europe, it should not be used delta-connected there. If the Y-connected starting of such a motor is proper with suddenly applied 400V, that is OK, then keep using Y-connected. But in practice, such motors are started with the Y-delta method at 400V networks (line-line) in many places. When switching to delta, each motor winding is exposed to root3 times voltage, that is, with excessive current. Then the power and torque are 3 times the rating value. The user seems happy. But the motor windings burn due to excessive current within 1-2 months. The coils need to be renewed every 1-2 months. If the motor is not in continuous use such as water pumps, this time can be extended. In order to use this method properly at a 400V network, the motor's ratings must be 693V for Y-connection and 400V for delta-connection. But such a motor can be rarely found on the market. Therefore, this starting method is misapplied in many places. It is appropriate to start these motors with this method only if there is a 230V network (line-line).
You are wrong all these motors have SERIES COIL Construction. that mean they can work with 440 volt in Delta Configuration and nothing happend, not any problem.
@@ivanfmartinezm You haven't given enough information about the motor's rated voltage. The user does not have to know whether the coils are series or parallel inside the motor. The user must know the rated voltage per phase.
Each coil support 220 volt line to line between phases so when users connect LOW VOLTAGE is a Delta connection and for HIGH VOLTAJE (440 VOLTS) IS in STAR Configuration that mean you have TWO (2) COILS in series connected to Phase Voltaje or Line to Line
@@ata_sevinc I hope you had understood my explanation the motor never get to burn whether it can do many start operation and work properly because it has been designed for that
@@ivanfmartinezm Star connected rated line-line voltage is sqrt(3) times as the voltage in delta connection, not twice. If each phase coil's rated voltage is 220V, then that motor's rated line-line voltages are 220V in delta and 380V in star connection. If it doesn't get burned under continuous operation with 380V or higher in delta connection, either the load is low or the rated voltage is stated lower.
seeing this video 1 1/2 year after it has been uploaded and thinking why did i take so long to get there. superb explanation engineering made very easy and interesting. good job and thanks
Yes, omission of phase links across the first contactor are missing. No, a 'main' contactor is not needed as these two perform the function of that. What should be included is a mechanical interlock between contactors as well as an electrical one. A further 2 pole double throw contactor would be needed to reverse the motor.
@@cqb1vet Ooh, I love white boards ;) e-mail me any time ! I've loads of info - it's just not indexed - sometimes it takes years to come to the surface ! What are you doing in front of whiteboards ?
I'm quite confused. 4:53 Where do you connect the "returning" cable, like the neutral in our household electricity? How is the electricity flowing there? And if the point of star connections is to lower the current that's allowed to flow, does that mean the startup is going to be even slower?
Ciroluiro 3 phase motors like this don't need neutral. They return current through the other phases as the phases are 120 degrees out of phase. Think of 3 AC sine waves staggered out by a third, you can measure voltage difference between them at any point. As for the star delta starter, it will get to star speed quite quickly, then after a small delay of maybe 2-5 seconds (depends on motor size) delta contractor will pull in and it will reach full speed quite quickly, whilst avoiding the massive current draw if they had tried to go directly from stopped to delta.
Ciroluiro Also, when in star, that point where all the bridges are shorted acts like the neutral in your house. For where I live, this would be around 240V AC RMS (phase to neutral), and when in delta (phase to phase), this would be about 400V. This could of course also be a higher value on high voltage motors.
That's interesting. I kinda suspected about the electricity returning on the negative of the other phases, but I wasn't sure about it. In reality I don't know a thing, but I had thought about something similar but never knew how to find the answer. Say you have 2 AA batteries; between the positive and negative terminal of a single battery there is a voltage difference. But then there's also a difference between the negative of one and the positive of another. So if you connect only those 2 terminals, does electricity flow? Because intuition tells me that it doesn't 'cause the circuit isn't closed. It may be a dumb question but I don't know a whole lot about electricity, just curious :P And for the star-delta connection, it doesn't add any more time till it reaches full speed AND also prevents the huge current draw than if it was started without the star-delta? Or did I get that wrong? Anyway thanks.
Yes, it is hard to conceptualise electrical behavior without experience and learning. For instance in AC, you wouldn't call the neutral the negative, as each phase goes negative and positive in relation to the neutral (usually 50 or 60 times per second). In your example with the batteries (DC power), your intuition is correct, current won't flow as the circuit is open. And yep, last part pretty much correct, star-delta might take a few seconds longer to start, whilst lowering inrush current, which prevents voltage drop to the rest of the installation, and also increases the longevity of the motor and associated switch gear. If you are interested, start learning about basic DC electrical concepts, then you can look into AC theory once DC makes sense. Once you have the basics of those two knuckled down, you can then start looking into more advanced things such as electronics.
Thanks for the information. Keep moving forward and always be successful. Keep up to date all the information about Electrical and electronic engineering. My best regards Fandy Nuari Pasaribu. Senior Electro Technical Officer at Oldendorff carrier.
no one is teaching in this way...so thats The reason y iam so average....in my college no has got job in eee department bt every sir has got doctorate in this subjects.....so bettr to study in this channel of youtube rather than going to those type of colleges...
Seems like that animator has never seen an actual star-delta-starter and its connections. There are 6 terminals (+protective earth) on such motor, why would anyone connect 9 leads (+pe, which is not in this video)? Then at showing the star contactor, there should be jumper leads visible at other side. Contactor wont do anything without those. And in real life, you wont just stole electricity from a side of another wire and contactors etc has been modeled to be real, so why not use connections on those to show where wires are really fixed.. And then there is the case of missing third contactor.. There's 1% of down votes, so those are the electricians watching this video? Its nice that most of whom has commented are stuck at nice animations, so probably wont be harming themselves with actual motor connections..
This animation is just for understanding the basic Y-D starter. If you want complete Y-D design than you should use main contactor, Mech. Interlock and push button....
I was looking for the third contactor too. but anyway this video is for getting the main idea, not to construct the circuit. and they're making great videos.
ville hietala - sir, they are only teaching the theory of star-delta motor working and not practical wiring. In actual wiring there is a third contactor which is the main contactor and NC -NO wiring in both the Star and Delta contactors. Please understand this is not a EEE class room.
bobdebelix still in use.. some people prefer this because when 1 part is broken, it does not affect other component as well and can easily be changed..
I guess it's OK for very powerful motors and if you don't need soft start and/or variable speed, because drives cost a lot of money. (More power, more money).
Actually this is just one version of an electric motor. With IGBTs or FETs you can drive it in all speeds. The Tesla Model S uses exactly this kind of motor.
In electric cars they use BLDC motors with permanent magnets, not induction motors. Induction motors are asynchronous while BLDC's are synchronous motors and they generate power when breaking (to charge the battery) which is not the case with induction motors. :)
bobdebelix There are many industrial applications where more complex drives would be completely unecessary and just add to the cost. Also induction motors can be used as generators, you just need to run them faster than the magnetic field. Many electric cars do use BLDC motors but the Tesla does use an induction motor. IMO induction motors are better than BLDC - motor drives are similary priced, efficiency is similar, and they don't require rare and expensive magnets. Pretty much every electric vehicle today bigger than a car uses induction motors - trolleybuses and trams, locomotives etc.
I am an EE Engineer and no one has ever explained this crystal clear... Can see great efforts behind this video. Congratulations.. 👏
Bhai tu ee engineer ban gaya aur tujhe pata bhi nahi hai ki induction motor start kaise hota hai 😆😆😆,interviewer ka l@ua munh mein liya tha kya?
"Engineer"
Aka a lonely man who lies on the internet
@@twerktospechow do you earn your daily bread?
I am concerned for your projects that you qualified as an electrical engineer and didn’t understand a basic motor starter until watching a RUclips video 🤣
A picture will always be worth more than a thousand words. If educators all over the world would explain math and engineering using clever animations like these ones, the rate of basic understanding and academic success would rise significantly in schools of all levels.
As an Industrial Electrician, now retired, I learned this starter application many years ago during my apprentice training. Your video should make this very easy and clear for young guys starting out in this trade. Excellent job.
Don't even have to go to school for it.
This explained in just 6 minutes what our professors couldn't during the whole course. thanks a lot
Yeah true
The weird and sad reality of the world is that most teachers are bad at explaining things. One of those things that should have been corrected for better efficiency, but strangely isn't. They don't understand what we don't understand. Understanding is hard - it should be a field of art in itself.
Ansar m sir 4pole motor 1750 rpm 36 slots and12set 2 coil motor series connection numbers diagrams send me I am very thanks too you
My lecturers were quite good and i already understood this,however,the visuals here makes the understanding perfect
i think it's because this with good animated video, coz picture win a thouson word video wins more imo
5 years in hvac and no one has ever been able to explain that to me like you did in this video! Much appreciated
Also, I appreciate the animations as well as the pauses, that give time to process the info!!
Interesting video. Now it's time for a part two to explain what's missing on the contactor depicted on the left and why it's essential to physically interlock the contactors. Keep at it, you're most of the way there.
Awesome explanation sir. Thank you. I am electrical Engineer myself during 1987-1991, during this period I use to study through text books only. Thanks to the computer animation, even a layman can understand the concept.
As someone who is learning electricity now, in the computer and internet age, I have so much respect for you guys that only had books and teachers.
After 5 years finally someone explains this properly. Thank you.
It’s a nice technician level instructional video. This is basic information on how a star-delta starter (or delta-wye starter) is wired. Presumably this leads to being able to troibleshoot one that isn’t working or replacing the motor with one with an unexpected terminal configuration.
Don’t expect to get anywhere as an EE in an electric machines course based on this much information. Even if you confine the topic to 3 phase squirrel cage induction motors an EE also needs to be able to refer the rotor schematic to the line side, understand why the rotor bars are skewed, understand how what this video identifies as the “stator” is wound and why, understand how to limit or prevent stray current through the bearings, understand how to calculate the slip rate, starting torque, running torque and breakdown torque, understand break before make vs make before break, the difference between a contactor and a relay... and whatever else your professor introduces during this basic topic because it prepares you for more complex machines like motors / alternators with wound synchronous rotors / exciters.
thanks teach
you have no idea how much you helped me right now!! Thank YOU
Yeah I have no idea so don't tell me 😂😂😂😂😂
@@mdnuralom6235 Erwiana e rrrrqquqq di Indonesia dengan tema tips 7 yg
@@mdnuralom6235 l olll
Llll
Ok
I'm a Mechanical & Electric engineer student this video is very useful to understand electric control machines. Grettings from Mexico.
Bro I have seen tons of videos and even went to school for this. Your video is more valuable than all previous resources I have encountered. Great job man.
Awesome explanation,spent 4 hours on this and none the wiser,in 6 minutes I now understand this arrangement.
This is a very effective explanation of a complex process using animation. It is a lot of work and I appreciate every second of it. Thank you!
Most people probably wondered how in the world you go from star to delta without opening up the box and manually arrange the connections. Also, how the contactors start from one setting to the next. Well, this video answers those questions very well.
The best illustrative explanation on RUclips I could find. Thank you
Bravo! This simplified, detailed and animated video is very easy to understand. Just like an Indian type of explanation but with American accent.
That was amazing... I mean really amazing.. During all my study and career I knew the motors draw huge starting current but never knew why they do so.. Thanks to you...
As EE I was always don’t have the clear understanding of this concept, but now I will never forget it. Thank you
the first clear and perfect video I watch concedering 3-phase induction motors
Watching this video..
ruclips.net/video/iUSlAYBGRgc/видео.html
Excellent narration and explanation. For a Mechanical engineer to understand the intricacies of 3 Ph AC motors, this video was just superb, fantastic. Thanks & Congratulations.
This video Taught me more about Induction motors and contractors than 5 years of Engineering.
I have seen some exaggerations in my life time but this one takes the cake
Contactors,contractors are other people who shots to capture Saddam Hussein
I really like this video. It gave a easy to understand explanation on the star-delta configuration. I feel like others try to over complicate stuff to make themselves feel smart or they just don't know how explain things very well.
Yes I agree
The best Engineering and scientific channel on RUclips! Thank you for amazing videos: It will not be necessary for future generation to be oriented on books.
Dilidjent awesome to see someone that likes science and engineering and also Tesseract. Love them
So you're saying we need to burn all books?
Good
@@shinigamisama5664 Me too
hi, i am from indonesia, i am the specialist of rewinding any broken sync motors or induction motors. your video is great, by the way.
Thank you very much, i've finally understand how contactor works including the star and delta connection.
www.electricaldon.com/
The clearest explanation of the functioning of the star delta induction motor starter I have come across. Thanks Sir
The way of teaching with animation I loved it
Who does these animations? They are amazing.
What program do you use?
बिकेश श्रेष्ठ
thank you so much for your help
I agree this was the first time I saw a technical video with such clarity of graphics and explanation.
great job
Austin Anderson these kind of animations take alot of time and effort to make
BEST EXPLANATION EVER! What caught my attention was the lack of over information, It has just the mainly and essential topics. Congratulations for this work!
When you guys find time maybe you can delve into all of the different types of AC and DC electric motors how they start and operate. Their torque an induction characteristics etc, etc
Wow,you are heroic for making such a difficult topic so easily accessible...
Great timing on the video! I just did the measurements of starting current in both delta and star formation on an electrical engineering lab course.
Possibly the most clear and concise explanation of 3 phase connection!
Very clean and informative. I learned this as part of energy efficiency course. Good job on both the explanation and animation!
Watching this video..
ruclips.net/video/iUSlAYBGRgc/видео.html
I loved it
As say honestly. By watching this vedio i actually understand whts the difference of star and delta connection and how it can identify. .thank you...for making this vedio...
I wish we were taught in this manner....we would have really learned so much !
Don't know if this channel is still up but Big Thanks this puts me in a great position now in 2022. Going into motors now in school .. instructor is Not diving deep enough . So I have to get how You live and that's On the Come Up✌️
You Sir deserve, to Live long and in prosperity!!!
Thanks a lot ❤️ . The concept is simple but lot of people don't know how to explain .
Thank you very much. The most clearest explanation I've ever seen. Animation makes it the best one.
Wow. I am blown with this explaination. this vidoe is worth of one months studies
amazing... today u learn the exact working of contactors with induction motor... thanks....
One of the best examples I have seen. I love Engineering. Engineers Build the world.
Brilliantly simple explanation. I never was quite sure about star delta starting and now it makes perfect sense. Awesome video.
I appreciate the guy who made this animation
I love the teaching techniques of this channel. Amazing :)
This is probably the best non mathematical explanation of a 3 phase motor I have seen. ...brilliant presentation.
Impossible to imagine is now possible after watching this video.
just clear and straightforward concept. Wonderful
You gave me such a fantastic insight how star-delta works. Many thanks :)
Somewhat made easy to understand star & delta configurations ,basic terminal connections,starter info mostly for a fresher candidates who are interested in core and technical field.Hope to come up with these basic videos mostly
Thanks for the knowledge YOU SHARE and a very good presentation. GOD BLESS YOU MORE!
best explanation with animation.. you just wowed me.....
First time in my life i understand how starter and induction motar work
Anyone who loves motors, transformers and anything electric has found heaven.. Great work here Learn Engineering.. Also, Nikola Tesla was 100 years ahead of his time. Founding father of 3 phase alternating current that will be in use until the end of time.
Just like gear shift, low first, then high
the best of all time explaination in star delta starter history!
i want be enginner, your video are very good .
Wish I had this video back when I was a student.. It would be much easier to understand those concepts.. Great work
This is so helpful, thank you so much.
I have the full understanding I needed.
Those magnetic relay also has interlock connected to ensure that it never on both in the same time otherwise, Boom.
I'm guessing that said boom threat is also a reason the contactors are in a separate box on the wall rather than closer to/on the motor case.
I thought there had to be SOMETHING preventing that, with how terrifying the risk of arc flash is at those kind of power levels.
alex Lo that was what I was wondering if the timer relay kept them from both being energized at the same time.
I think also there should be third contractor named common in addition to star and delta contractors
@@aymankamel7139 Usually called the main contactor which carries the motor over load connection.I have always seen it done with three.Looking at his diagram he as missed out showing the cables bridging across the top of the star contactor without which the coils are open circuit and nothing would happen. Apart from that it all seems ok to me and does save the cost of the third contactor, as long as all interlocks are connected [ to stop both contactors operating at the same time] and the overloads are fitted it seems a good way of doing it. A different way of doing the same thing ,good to know.
It's taken me years to find a video this clear for star delta configurations
The video explains the operation of the induction motor with very good animations. Y-Delta starting is also explained well, but the usual misapplication in practice is not mentioned.
It is wrong to apply this method at a 400V (line-line) network to a motor whose rating is 230V for each phase. Because such a motor should be used at a 400V network if Y-connected, and at 230V (line-line) if delta-connected. Since most networks' line-line rating is 400V in Europe, it should not be used delta-connected there. If the Y-connected starting of such a motor is proper with suddenly applied 400V, that is OK, then keep using Y-connected.
But in practice, such motors are started with the Y-delta method at 400V networks (line-line) in many places. When switching to delta, each motor winding is exposed to root3 times voltage, that is, with excessive current. Then the power and torque are 3 times the rating value. The user seems happy. But the motor windings burn due to excessive current within 1-2 months. The coils need to be renewed every 1-2 months. If the motor is not in continuous use such as water pumps, this time can be extended.
In order to use this method properly at a 400V network, the motor's ratings must be 693V for Y-connection and 400V for delta-connection. But such a motor can be rarely found on the market. Therefore, this starting method is misapplied in many places. It is appropriate to start these motors with this method only if there is a 230V network (line-line).
You are wrong all these motors have SERIES COIL Construction. that mean they can work with 440 volt in Delta Configuration and nothing happend, not any problem.
@@ivanfmartinezm You haven't given enough information about the motor's rated voltage. The user does not have to know whether the coils are series or parallel inside the motor. The user must know the rated voltage per phase.
Each coil support 220 volt line to line between phases so when users connect LOW VOLTAGE is a Delta connection and for HIGH VOLTAJE (440 VOLTS) IS in STAR Configuration that mean you have TWO (2) COILS in series connected to Phase Voltaje or Line to Line
@@ata_sevinc I hope you had understood my explanation the motor never get to burn whether it can do many start operation and work properly because it has been designed for that
@@ivanfmartinezm Star connected rated line-line voltage is sqrt(3) times as the voltage in delta connection, not twice. If each phase coil's rated voltage is 220V, then that motor's rated line-line voltages are 220V in delta and 380V in star connection.
If it doesn't get burned under continuous operation with 380V or higher in delta connection, either the load is low or the rated voltage is stated lower.
Very very clear 1st time star and delta diagram- connection practically on the motor. Thank you very much.
Awesome explanation. Please upload some more videos related to OPAMP.
the production value on this channel is ... fantastic
many thanks from my heart I'm electrical technician i got very helpful god bless you
this is gold for a marine engineer like me...
This video helped me a lot during my examination.so thank you for making such an awesome video 😊
That is the simplest & the most effective explanation of Star delta config i have come across yet.Good Job guys!
Thnku so much,,, wonderful explanation and Animation 👌👌👍👍👏👏👏
This video solved all problems on star delta starter.
Great job
Very good explanation!!
seeing this video 1 1/2 year after it has been uploaded and thinking why did i take so long to get there. superb explanation engineering made very easy and interesting. good job and thanks
Great video, thanks!
See this video...
ruclips.net/video/iUSlAYBGRgc/видео.html
As a beginner I find your videos very interesting and insightful keep up the good effort.
講解的太完美！
I am from India, very good Explained❤
please also make a video about relay used in electrical panels....
See this video.
ruclips.net/video/iUSlAYBGRgc/видео.html
you explaination, are better than my professor. i believe teachers, lecturers uses this video as thier material for lecture
A " star " was usually refered to a " wye " connection in my experience and learning.📐🎓⚡
I can't thank you enough for this video.🙌
Subscribed immediately, hope there's more content because the explanations are so well done.
Perfect till the last minute where you skipped the details of a star delta starter.
i am not an engineer, i am a developer, and as programming can be hard.. i am stunned by this knowledge.. my respect.
Learn Engineering
the connection of star contactor missing the upper connections also the main contactor not present
Yes, omission of phase links across the first contactor are missing.
No, a 'main' contactor is not needed as these two perform the function of that.
What should be included is a mechanical interlock between contactors as well as an electrical one.
A further 2 pole double throw contactor would be needed to reverse the motor.
@@cqb1vet Ooh, I love white boards ;)
e-mail me any time !
I've loads of info - it's just not indexed - sometimes it takes years to come to the surface !
What are you doing in front of whiteboards ?
Great animation sir. By watching this video I understood the whole concept of star-delta starter.
great video
Awesome the star delta mystery solved thankyou uploader I'as searching this question from past few years as a electronics and communication engineer
I'm quite confused. 4:53 Where do you connect the "returning" cable, like the neutral in our household electricity? How is the electricity flowing there?
And if the point of star connections is to lower the current that's allowed to flow, does that mean the startup is going to be even slower?
Ciroluiro 3 phase motors like this don't need neutral. They return current through the other phases as the phases are 120 degrees out of phase. Think of 3 AC sine waves staggered out by a third, you can measure voltage difference between them at any point. As for the star delta starter, it will get to star speed quite quickly, then after a small delay of maybe 2-5 seconds (depends on motor size) delta contractor will pull in and it will reach full speed quite quickly, whilst avoiding the massive current draw if they had tried to go directly from stopped to delta.
Ciroluiro Also, when in star, that point where all the bridges are shorted acts like the neutral in your house. For where I live, this would be around 240V AC RMS (phase to neutral), and when in delta (phase to phase), this would be about 400V. This could of course also be a higher value on high voltage motors.
That's interesting. I kinda suspected about the electricity returning on the negative of the other phases, but I wasn't sure about it. In reality I don't know a thing, but I had thought about something similar but never knew how to find the answer. Say you have 2 AA batteries; between the positive and negative terminal of a single battery there is a voltage difference. But then there's also a difference between the negative of one and the positive of another. So if you connect only those 2 terminals, does electricity flow? Because intuition tells me that it doesn't 'cause the circuit isn't closed. It may be a dumb question but I don't know a whole lot about electricity, just curious :P
And for the star-delta connection, it doesn't add any more time till it reaches full speed AND also prevents the huge current draw than if it was started without the star-delta? Or did I get that wrong?
Anyway thanks.
I hadn't read that last comment. That's also interesting but complicated when put all together. Just me though.
Yes, it is hard to conceptualise electrical behavior without experience and learning. For instance in AC, you wouldn't call the neutral the negative, as each phase goes negative and positive in relation to the neutral (usually 50 or 60 times per second). In your example with the batteries (DC power), your intuition is correct, current won't flow as the circuit is open.
And yep, last part pretty much correct, star-delta might take a few seconds longer to start, whilst lowering inrush current, which prevents voltage drop to the rest of the installation, and also increases the longevity of the motor and associated switch gear.
If you are interested, start learning about basic DC electrical concepts, then you can look into AC theory once DC makes sense. Once you have the basics of those two knuckled down, you can then start looking into more advanced things such as electronics.
Thanks for the information. Keep moving forward and always be successful. Keep up to date all the information about Electrical and electronic engineering. My best regards Fandy Nuari Pasaribu. Senior Electro Technical Officer at Oldendorff carrier.
no one is teaching in this way...so thats The reason y iam so average....in my college no has got job in eee department bt every sir has got doctorate in this subjects.....so bettr to study in this channel of youtube rather than going to those type of colleges...
Exactly. I sucked back in school, because I couldn't understand anything.
Good luck getting a job putting RUclips videos as schooling lol
Probably because you’re grammar is sheet
My best learning channel ❤️❤️❤️
Definitely wouldn't of worked in star without links in the other side of that star contactor. No star point
Nice notice, i would've also appreciated a some sort of analysis how the star and delta affect current and torque, instead of just saying its smaller
Amazing way of explaining using anime. Excellent work
Just thanks
never seen such a great animated explanation on this concept before.
Seems like that animator has never seen an actual star-delta-starter and its connections. There are 6 terminals (+protective earth) on such motor, why would anyone connect 9 leads (+pe, which is not in this video)?
Then at showing the star contactor, there should be jumper leads visible at other side. Contactor wont do anything without those. And in real life, you wont just stole electricity from a side of another wire and contactors etc has been modeled to be real, so why not use connections on those to show where wires are really fixed.. And then there is the case of missing third contactor..
There's 1% of down votes, so those are the electricians watching this video? Its nice that most of whom has commented are stuck at nice animations, so probably wont be harming themselves with actual motor connections..
Exactly my thoughts! Also, the Delta contactor was quite unclear.
This animation is just for understanding the basic Y-D starter. If you want complete Y-D design than you should use main contactor, Mech. Interlock and push button....
I was looking for the third contactor too. but anyway this video is for getting the main idea, not to construct the circuit. and they're making great videos.
yep i was thinking WTF the whole time in this video lol
ville hietala - sir, they are only teaching the theory of star-delta motor working and not practical wiring. In actual wiring there is a third contactor which is the main contactor and NC -NO wiring in both the Star and Delta contactors. Please understand this is not a EEE class room.
why there are always people who put a thump down for such great videos?whats their problem???
Is this still in use? Don't people use electronic motor drives nowadays?
bobdebelix still in use.. some people prefer this because when 1 part is broken, it does not affect other component as well and can easily be changed..
I guess it's OK for very powerful motors and if you don't need soft start and/or variable speed, because drives cost a lot of money. (More power, more money).
Actually this is just one version of an electric motor. With IGBTs or FETs you can drive it in all speeds. The Tesla Model S uses exactly this kind of motor.
In electric cars they use BLDC motors with permanent magnets, not induction motors.
Induction motors are asynchronous while BLDC's are synchronous motors and they generate power when breaking (to charge the battery) which is not the case with induction motors. :)
bobdebelix There are many industrial applications where more complex drives would be completely unecessary and just add to the cost. Also induction motors can be used as generators, you just need to run them faster than the magnetic field.
Many electric cars do use BLDC motors but the Tesla does use an induction motor. IMO induction motors are better than BLDC - motor drives are similary priced, efficiency is similar, and they don't require rare and expensive magnets.
Pretty much every electric vehicle today bigger than a car uses induction motors - trolleybuses and trams, locomotives etc.