Best explanation I have ever seen for starting single phase AC motor. Impressed that you also covered the variations of starting systems. A little louder would have been good, but my thanks to you for helping me.
You did it, you killed it, you got the explanation well easily explained with the basic/fundamental Electrical & mathematical principles, without complexities. Well presented! Thanks. More of such
I have probably seen hundreds of images, diagrams, text explanations and videos and none of them made it 'click' for me. Your video did it. It was simple yet well detailed. Thank you!
Thanks for a very clear and definitive presentation - your graphics helped a lot. I especially liked the one where you increase the capacitance with the "slider" and show the effect on the vector and field windings diagrams. Great job!
Awesome. I don't know how many times I've looked this up over the years. Your explanation along with recently looking up an example of a person using capacitors to get around a split phase supply to make a three phase motor to work has finally made this "click." Thanks.
Fantastically done, was searching for ages on how to make a DIY single phase AC motor, couldn't find anything i understood until i stumbled across this, hats off to you!
Respected Sir I have watched all videos regarding this topic, but trust me, i have never found any video that is better than you. Thank you so m😊uch explaining this topic in a very simple way
Excellent video except for the very low audio. Also as pointed out previously, opposite poles attract, similar polls repell, not what the animation is showing, otherwise one of the best explanations I have seen on RUclips.
Its amazing that many other videos have fancy animations which somewhat help to understand this concept, but this "roughly" but very clearly drawn presentation really helped me to understand it! That CIVIL is great to know, never heard of it.
i have watched many videos with and without animation but by graph and 2D explanation i understood it very well. very good way of explaining the concept
Excellent explanation. Most videos dont really show the mathematical model behind monophase motors and just give a qualitative explnation. I find it much easier to understand whats happening when you use phasor and how each current and voltaje quantity are out of phase
Thank You! I've wanted someone to explain how this this works for a long time! I understood that it was needed to start the directional motion but didn't understand how or why!
When you hold a compass in your hand, what direction does the needle with the N point towards. Same applies here. The North seeking pole points towards the North Pole.
@@RoddyMcNamee No it doesn't. wtamu.edu/~cbaird/sq/mobile/2013/11/15/why-does-a-magnetic-compass-point-to-the-geographic-north-pole/#:~:text=When%20it%20comes%20to%20magnets,to%20the%20geographic%20north%20pole.&text=The%20geographic%20north%20and%20south,rotation%20axis%20intercepts%20earth's%20surface.
Thank you for this explanation! I recently discovered single phase brushless when I took apart a three wire projector fan. My projector has gone through two fans now (8 months apart) and throwing fan speed errors again. The fans still work but after 10 minutes the projector throws a fan speed error. I think the projector is running the fan at too low voltage causing premature failure of the tachometer signal (hall effect sensor circuit) or is wearing out other circuit components and the fan is truly running slower than it should. I'm hoping to gain a better understanding and hopefully fix or re-engineer the projector to stop going through fans. The projector is BENQ W1070. If I run the projector in "high-altitude mode" it runs the fan at high speed and it doesn't get the error but is so loud I can't enjoy using the projector. Oh, I should add that it only has two wires but four poles on the stator. Perhaps the capacitor is hidden on the stator somewhere to avoid having to solder four wires to the circuit board. I'll have another look when I get home from work.
First of all, I want to say thank you for the best & simple explanation video.. This single video has almost everything I've been looking for about single phase induction motor. Second thing, if you don't mind, please explain a bit more about winding direction in relation with the electromagnet poles created. (I.e. in L1 or L2, what happend if half of the coil winding is in opposite direction. Half Clockwise and half CCW) ??? Thanks in advance.. 🙏🙏🙏🙏🙏🙏
This is awesome... I am trying to fix my table fan which wont start and I believe this is the same phenomenon that works for table fan motors... I have checked out the start capacitor charges and discharges fine, which leaves me with trying to get to the thermo fuse which I believe has blown out...
@@RoddyMcNamee Man, I am stuck with some really wiered AC motor wiring if you can shed some light it will be great. It is an extractor motor 240v and takes max one to 3 amps, But what is strange that after the electronic circuits it has six wires connected to the motor, the top three are connected to the electronic circuits but the other three are not connected directly to the electronic circuits at all. There is no continuity between the wires except two wires shows continuity but the wires that shows continuity one is connected to the electronic supply side but the other one is not and there is no continuity between any other wires, I took a new one that is working and tested that one and it is the same thing yet it works , i have never encounter anything like befor if you can help you will have my deepest respect. So far every has fallen on it ha ha ha.
@@democracyforall does the extractor fan have variable speeds, e.g. a speed switch, if so, the extra wires may be for different windings of the motor relating to different speeds????
@@RoddyMcNamee yes but there is no continuity except two looks like they have done through that electronic circuit separately will work it out no worries I work as an electrician this is the first time I saw some things like but no worries thanks
So, one question just popped-up in my mind. Is is possible to create three phase from a single phase supply by using two different capacitors that has correct capacitances?
It seems like if you could invert the current to the second phase this would make its phase effectively lag that of the first winding's phase by 90 degrees, thereby reversing the rotation. Or if you could somehow shift the second winding's phase forward by 180 degrees that would also work.
Joe, to reverse a two phase motor you need to reverse one of the phases. In your case you have, I expect, a single phase (split phase) motor. I say this because the domestic electrical supply to a house is generally single phase only. However some washing machines the motors are already wired to rotate in both directions. If you look at your motor can you see two capacitors? They probably look like cylindrical objects? If so, then you are in look and you just need to make sure the power is "split" from the supply to the opposite capacitor to the one it currently is connected to.
so you have a magnetic field but you need initial motive so you make another magnetic field which has the same directions of the first one the two field will sum up and get larger or smaller magnetic field but still no initial motive how the rotor revolve ?
Hellow sir Well taking this concept and using 3 phase wire with 4 pole along with above top view of stator im bit confused as i couldn't relate. It would be grateful if you could make video on rotating magnetic field of 3 phase with 4 pole particularly.
The run winding is much different than the start winding due to the value of inductance. Since the run winding is made to carry the larger current the resistance will be minimal as opposed to the start circuit where resistance is larger with a lesser inductance and the capacitor in series the will offset the phase angle from the start. In your video you made it seem that the two are both the same value of inductance.
hey man u r explanation very good why dont increase your volume , i cant hear your properly next time if u post any video, pls use a gud mic so that every body can understand,
I am so interested in this topic and I've been looking for this kind of video for a long time now. And finally, I've found it ... and I can't understand it because I the guy is speaking so softly and I can't understand what he is saying (hu-hu)
Thank you for making such as good video! All kind of single phase motors are need out of phase current in motor wiring(start&run) to start or keep running the motor in a AC circuit, right? in this full AC circle, i1 with i2 has 90 degree out of phase. from 0 degree to 90 degree, the direction of the current is from the AC source to capacitor, the capacitor charge from 0 to the peak. what about the direction of the current flow in i1 in the same period?
The reason I ask is that I think I have a two phase motor like the one in your video. It came from my old washing machine and I'm using it on my (corded) A/C electric mower now, but need to reverse the rotation for the blades to cut the grass. I've turned the blade upside down as a temporary fix, but would like to know if the motor can be reversed. Thanks.
Hi there....great video....a little quiet....but very good. Please tell me....I'm no expert, just observing, but in the UK we have single phs Live and Neutral. Your schematic shows L1 and L2 as with the USA. 1. Is this a kind of 2 phase arrangement with two different angles ?....is there a Neutral? 2. In an induction motor, is the Rotor always a magnet? I see many schematics showing just a coil of wire? Appreciate your clarification. Best Regards Rob
This is a single phase motor. The second phase is artificially created with the addition of the second winding with the capacitor. This is how you would start a single phase motor in the UK.
With an induction motor, the rotor is not a magnet, but is a squirrel cage type. Current is induced (hence the name) into the rotor, and this current creates a magnetic field similar to a magnet.
There's another thing I don't understand. Let's say there's a heavy gear put on the motor and it needs 10 seconds to spin up to it's normal RPM. The AC current is always 50 or 60 Hz... As soon as the motor makes a fragment of 1 revolution, the current already gets to it's opposite value and the motor will slow down and get to it's start position. How the motor spins up in that case? The rotor must go forward/backward 50 times a second. That's the thing that I can't find on the internet, maybe because of my bad English or my thoughts are totally wrong.
You made the best video explaining how to start single phase motor. So in theory you can use various size start capacitors which will create phase angle different than ideal 90 degree, but until there is enough torque motor will start normally? I am asking because I have motor with missing start capacitor and I don't know which value to choose. Is there any formula to calculate capacitor value from windings resistance maybe?
You'll need to know the inductance of the winding as well as its resistance. If you look at this video ruclips.net/video/DSwaCGRjGLg/видео.html it will show you the formulas and how to determine the phase angle. Hope that helps.
Best explanation I have ever seen for starting single phase AC motor. Impressed that you also covered the variations of starting systems. A little louder would have been good, but my thanks to you for helping me.
A little louder would have been good [2]
Hands down, the best explanation of how an AC motor works! I'm a visual learner and that was clear as day!
Watching this makes me wonder why I've never seen this concept explained so clearly before? You make it so clear and simple!
Hands down the best explanation of this I have ever come across. Love the capacitance slider to achieve 90 degrees. Thanks.
You did it, you killed it, you got the explanation well easily explained with the basic/fundamental Electrical & mathematical principles, without complexities. Well presented! Thanks. More of such
You realize that same polarities reject, right?
Lol this means you didn't understand it properly ogunka
@@victoralejandro3460His explanation of polarities was the only mistake he made. Everyone knows opposites attract.
I have probably seen hundreds of images, diagrams, text explanations and videos and none of them made it 'click' for me. Your video did it. It was simple yet well detailed. Thank you!
I spent a while looking for a good explanation of this. This is a great explanation! Thank you!
Thanks for a very clear and definitive presentation - your graphics helped a lot. I especially liked the one where you increase the capacitance with the "slider" and show the effect on the vector and field windings diagrams. Great job!
Awesome. I don't know how many times I've looked this up over the years. Your explanation along with recently looking up an example of a person using capacitors to get around a split phase supply to make a three phase motor to work has finally made this "click."
Thanks.
Fantastically done, was searching for ages on how to make a DIY single phase AC motor, couldn't find anything i understood until i stumbled across this, hats off to you!
I watched many animated videos but this one explained the best. I now know what happens. Thank you. lol won't forget your voice.
explained so well and in such a simple way, I got everything even with such a low volume. Thanks for delivering
Respected Sir
I have watched all videos regarding this topic, but trust me, i have never found any video that is better than you. Thank you so m😊uch explaining this topic in a very simple way
Excellent video except for the very low audio. Also as pointed out previously, opposite poles attract, similar polls repell, not what the animation is showing, otherwise one of the best explanations I have seen on RUclips.
Good video. Filled in some blanks in my mind on what is going on with a capacitor and AC motors and what they do.
Its amazing that many other videos have fancy animations which somewhat help to understand this concept, but this "roughly" but very clearly drawn presentation really helped me to understand it! That CIVIL is great to know, never heard of it.
i have watched many videos with and without animation but by graph and 2D explanation i understood it very well. very good way of explaining the concept
thank you very much men, this is the best explanation I have ever had for this subject.
May God bless you.
Excellent explanation. Most videos dont really show the mathematical model behind monophase motors and just give a qualitative explnation. I find it much easier to understand whats happening when you use phasor and how each current and voltaje quantity are out of phase
0:45 North of the magnet is not being attracted by north of the magnetic field. Them repell each other.
Excellent video!!
And he repeats the same mistake at 1:08.
@@charleslyell3748 I made a video on my channel! I’ll translate it to English! I correct this mistake on my video!
Finally after 5 vids I understand why they need a capacitor thanks
Help me sir, why do we neee capacitor here?
Beautifully explained graphically. Thanks!
Thanks for great video but please annotate that similar magnetic poles repell and different attract.
Please fix the volume!
Best explanation I've seen!
Thank You! I've wanted someone to explain how this this works for a long time! I understood that it was needed to start the directional motion but didn't understand how or why!
excellent explanation and perfect presentation skills.
Keep me updated with any further videos .
Very good explanation, as a slow person I should know.
Excellent sir, Thank you , Good Luck.
best explanation I've seen so far, deserves more views. Keep making more videos. Cheers.
I could hear it okay with the headphones on, but not through my speakers. Terrific explanation, though.
Excellent Elaboration of a single phase motor.👍
Your the best.. nice work.
Best explanation ever
Thanks Sir.. this was nicely explained.
okay good presentation the only thing I couldn't get is does the opposite pole repel plus why are u wishpering
Good. Missed one basics there may b unknowingly... Regarding magnetic poles property 😊
Yes not correct
When you hold a compass in your hand, what direction does the needle with the N point towards. Same applies here. The North seeking pole points towards the North Pole.
@@RoddyMcNamee No it doesn't. wtamu.edu/~cbaird/sq/mobile/2013/11/15/why-does-a-magnetic-compass-point-to-the-geographic-north-pole/#:~:text=When%20it%20comes%20to%20magnets,to%20the%20geographic%20north%20pole.&text=The%20geographic%20north%20and%20south,rotation%20axis%20intercepts%20earth's%20surface.
Thank you for this explanation! I recently discovered single phase brushless when I took apart a three wire projector fan. My projector has gone through two fans now (8 months apart) and throwing fan speed errors again. The fans still work but after 10 minutes the projector throws a fan speed error. I think the projector is running the fan at too low voltage causing premature failure of the tachometer signal (hall effect sensor circuit) or is wearing out other circuit components and the fan is truly running slower than it should. I'm hoping to gain a better understanding and hopefully fix or re-engineer the projector to stop going through fans. The projector is BENQ W1070. If I run the projector in "high-altitude mode" it runs the fan at high speed and it doesn't get the error but is so loud I can't enjoy using the projector.
Oh, I should add that it only has two wires but four poles on the stator. Perhaps the capacitor is hidden on the stator somewhere to avoid having to solder four wires to the circuit board. I'll have another look when I get home from work.
Beautifully explained. Thank you.
First of all, I want to say thank you for the best & simple explanation video.. This single video has almost everything I've been looking for about single phase induction motor.
Second thing, if you don't mind, please explain a bit more about winding direction in relation with the electromagnet poles created. (I.e. in L1 or L2, what happend if half of the coil winding is in opposite direction. Half Clockwise and half CCW) ???
Thanks in advance..
🙏🙏🙏🙏🙏🙏
Thank you so much pro! :) It's very clear and easy to understand!
Good explanation, but you've got the magnet attractions backwards. Opposite poles attract, and like poles repel.
This is awesome... I am trying to fix my table fan which wont start and I believe this is the same phenomenon that works for table fan motors... I have checked out the start capacitor charges and discharges fine, which leaves me with trying to get to the thermo fuse which I believe has blown out...
superb🙈❤️🤛
Great job buddy
thank you this was very helpful
Beautifully explained.
Beautiful !!!!.................................... Simple n Clear !
how do you determine whether or not a motor needs a start or run capacitor, and how to you calculate the amount of farad's each capacitor requires?
This is a wonderful video.
Nice and useful but I think you changed the colours on the waveform diagram.
the best explanation ,thank u so much ,but i hope you fix the volume
Nice Job, thanks to you I am starting to understand !!!
Very good demonstration. So what you are doing is using the capacitor in the start windings make the motor start like a two phase motor! Correct?
Okie-Tom yes.
awesome explanation very good
GREAT video. Very well and simply explained whilst still going into a decent level of detail. Great profile pic too! ;) YNWA!
Thanks James. Good spot on the profile pic. YNWA.
@@RoddyMcNamee Man, I am stuck with some really wiered AC motor wiring if you can shed some light it will be great. It is an extractor motor 240v and takes max one to 3 amps, But what is strange that after the electronic circuits it has six wires connected to the motor, the top three are connected to the electronic circuits but the other three are not connected directly to the electronic circuits at all. There is no continuity between the wires except two wires shows continuity but the wires that shows continuity one is connected to the electronic supply side but the other one is not and there is no continuity between any other wires, I took a new one that is working and tested that one and it is the same thing yet it works , i have never encounter anything like befor if you can help you will have my deepest respect. So far every has fallen on it ha ha ha.
@@democracyforall does the extractor fan have variable speeds, e.g. a speed switch, if so, the extra wires may be for different windings of the motor relating to different speeds????
@@RoddyMcNamee yes but there is no continuity except two looks like they have done through that electronic circuit separately will work it out no worries I work as an electrician this is the first time I saw some things like but no worries thanks
Yes, this is the best one.
Nice video
Great job explaining this! Thank you
I can't thank you enough. Great job!!
The weird thing is the advertisement is louder than the video content itself.
Good explanation, thanks for making the video!
So, one question just popped-up in my mind. Is is possible to create three phase from a single phase supply by using two different capacitors that has correct capacitances?
Excellent explanation!
It seems like if you could invert the current to the second phase this would make its phase effectively lag that of the first winding's phase by 90 degrees, thereby reversing the rotation. Or if you could somehow shift the second winding's phase forward by 180 degrees that would also work.
Joe, to reverse a two phase motor you need to reverse one of the phases. In your case you have, I expect, a single phase (split phase) motor. I say this because the domestic electrical supply to a house is generally single phase only. However some washing machines the motors are already wired to rotate in both directions. If you look at your motor can you see two capacitors? They probably look like cylindrical objects? If so, then you are in look and you just need to make sure the power is "split" from the supply to the opposite capacitor to the one it currently is connected to.
so you have a magnetic field but you need initial motive so you make another magnetic field which has the same directions of the first one the two field will sum up and get larger or smaller magnetic field but still no initial motive how the rotor revolve ?
very awesome explanation like it .
Great job !!! better than my incompetent professors
nice video
Hellow sir
Well taking this concept and using 3 phase wire with 4 pole along with above top view of stator im bit confused as i couldn't relate. It would be grateful if you could make video on rotating magnetic field of 3 phase with 4 pole particularly.
Wow thank u dude Incredible explanation
edit: btw what software did u use for explanation
The run winding is much different than the start winding due to the value of inductance. Since the run winding is made to carry the larger current the resistance will be minimal as opposed to the start circuit where resistance is larger with a lesser inductance and the capacitor in series the will offset the phase angle from the start. In your video you made it seem that the two are both the same value of inductance.
So why do we need a Starter capacitor and a Run capacitor in a fridge ac compressor motor. There is only need for 1 capacitor.
very great explanation thank you
please upload another video for a three phase induction moter like this.
whether there will be a different in starting and running winding current?
Excellent explanation! Thank you...
good job...
Great explanation!
hey man u r explanation very good why dont increase your volume , i cant hear your properly next time if u post any video, pls use a gud mic so that every body can understand,
simple and clearly explained
I am so interested in this topic and I've been looking for this kind of video for a long time now. And finally, I've found it ... and I can't understand it because I the guy is speaking so softly and I can't understand what he is saying (hu-hu)
A excellent explanation thnx sir
This is an excellent explanation in my opinion.
Is there any way you could do a description on how a brushed AC motor starts/runs?
howardtoob Thanks for the comment. When you say a "brushed AC motor" do you mean a synchronous AC motor?
Specifically a central vacuum motor which, I think, is a non-synchronous universay motor???
Thank you, the video was very helpful!
Thank you for making such as good video! All kind of single phase motors are need out of phase current in motor wiring(start&run) to start or keep running the motor in a AC circuit, right? in this full AC circle, i1 with i2 has 90 degree out of phase. from 0 degree to 90 degree, the direction of the current is from the AC source to capacitor, the capacitor charge from 0 to the peak. what about the direction of the current flow in i1 in the same period?
good explanation.really like it
Great explanation sir
Great explanation.
The reason I ask is that I think I have a two phase motor like the one in your video. It came from my old washing machine and I'm using it on my (corded) A/C electric mower now, but need to reverse the rotation for the blades to cut the grass. I've turned the blade upside down as a temporary fix, but would like to know if the motor can be reversed. Thanks.
Hi, It was very good but sound is very low, please fix this issue thank you.
I always wondered how the AC electric motor starts when the magnetic field is changing non stop
Thank you
Hi there....great video....a little quiet....but very good. Please tell me....I'm no expert, just observing, but in the UK we have single phs Live and Neutral. Your schematic shows L1 and L2 as with the USA. 1. Is this a kind of 2 phase arrangement with two different angles ?....is there a Neutral?
2. In an induction motor, is the Rotor always a magnet? I see many schematics showing just a coil of wire?
Appreciate your clarification.
Best Regards
Rob
This is a single phase motor. The second phase is artificially created with the addition of the second winding with the capacitor. This is how you would start a single phase motor in the UK.
There is only one live and one neutral.
With an induction motor, the rotor is not a magnet, but is a squirrel cage type. Current is induced (hence the name) into the rotor, and this current creates a magnetic field similar to a magnet.
There's another thing I don't understand. Let's say there's a heavy gear put on the motor and it needs 10 seconds to spin up to it's normal RPM. The AC current is always 50 or 60 Hz... As soon as the motor makes a fragment of 1 revolution, the current already gets to it's opposite value and the motor will slow down and get to it's start position. How the motor spins up in that case? The rotor must go forward/backward 50 times a second. That's the thing that I can't find on the internet, maybe because of my bad English or my thoughts are totally wrong.
What I think you are referring to here is called "Slip". If you look up some videos on Torque / Slip for induction motors it might help.
@@RoddyMcNamee Thank you so much! I subscribed to your channel and clicked the bell too. 🤩
Sir a perfect explanation.but just check your ckt diagram and noticed the position of capacitor an centrifugal switch ? I think it is wrong
Please increase a bit volume... Thank you...
You made the best video explaining how to start single phase motor. So in theory you can use various size start capacitors which will create phase angle different than ideal 90 degree, but until there is enough torque motor will start normally? I am asking because I have motor with missing start capacitor and I don't know which value to choose. Is there any formula to calculate capacitor value from windings resistance maybe?
You'll need to know the inductance of the winding as well as its resistance. If you look at this video ruclips.net/video/DSwaCGRjGLg/видео.html it will show you the formulas and how to determine the phase angle. Hope that helps.
why are you using a capacitor , when you add two coils so that you can make it work automatically ?
+devilantony krop
The capacitor creates a phase difference between the two coils and thereby creates a rotating magnetic field.
good presentation