Motor Poles and RPM Explained

[@LearningInVR]

Didn't realize i was coming here for this but I was looking for answers what pops up .., never fails .... thanks Tim

[@TimWilborne]

You are welcome!

[@aarongrady7354]

Really helpful. Thank you. From a 3rd year electrical apprentice.

[@TimWilborne]

Glad it was helpful!

[@gabrielkatoka9497]

minor addition: Less poles - high speed - low torque. More poles - low speed - high torque.

[@sorinionescu8702]

Hello, so if I want to make a generator from a three-phase motor that has 8 poles, then the number of magnets I have to put on the rotor is 24 magnets? (12N and 12S)

[@TimWilborne]

I'm not sure. Here's a video of my kids did adding magnets to a motor to make a generator, I'm still not sure I understand the optimal placement. kzbin.info/www/bejne/Z2bblZyogt-DpdE

[@vaishnavivijayakumar1127]

One thought to add, speed of an ac motor inversely proportional to no of poles, and directly proportional to frequency, your video time 3:06 supports this.

[@TimWilborne]

Yes, stick a few more numbers in there and you have the formula. RPM = Hz* (2 / poles) * 60 twcontrols.com/lessons/motor-poles-amp-rpm

[@daniellebron2291]

Do you know if a mo-6226 motor could be used for an ebike?

[@farhozz]

which one is better between four poles or two poles for table saw (wood saw) ?

[@TimWilborne]

It isn't a matter of which one is better, it is a matter of which one meets the requirements for your speed. Figure out what blade speed you need and work your way back to the motor.

[@farhozz]

@@TimWilborne if I use a ratio pulley to get the required rpm,which is better between low rpm with higher torque or high rpm which is closer to the required rpm ?

[@TimWilborne]

@@farhozz There won't be a big difference.

[@farhozz]

@@TimWilborne Thank you very much sir

[@dora9103]

is 3600 rpm for 60hz fixed? how can we adjust the speed? by changing pwm frequency? or voltage?

[@TimWilborne]

You could use a VFD or AC drive to lower the frequency. If you have the Hz then you half the speed.

[@dora9103]

@@TimWilborne i see thanks!

[@TimWilborne]

You are welcome

[@ahmadblueeyes]

Thanks nice explanation of poles. I have a question, I came across TFO-FK 2p 200V motor. Its got 3 wires coming out of it. Not sure how to hook it up as I've got single phase 220v and 3 phase 220v supply available.

[@TimWilborne]

You need to make sure what you have but it sounds like a 3 phase motor, you'll need a rotary phase converter, see link below. kzbin.info/www/bejne/oWrXg2yaaKmmp7s

[@ayadsuha]

please can you tell me refrigerator compressor coil .. how many poles thank you

[@Idrathernot.]

I have disassembled multiple Baldor motors; both 1800 and 3600 rpm and I noticed that that the 3600 rpms use a lot more wire in the windings ( which take more space) and as a consequence the rotor's diameter has to be smaller. On the 1800 rpm motors the rotor is bigger and there's less wire use for the windings. Could anybody explain why? I'm just curious as to why that is the case. Each comparison was made using motors being the same HP and having the same physical size.

[@troubleshooter1975]

The 1800RPM (1725) have all those windings in SERIES (AFAIK), thus to TOTAL bulk winding volume is about the same AFAIK. (it is just getting split, distributed among more locations around the circle... I'm not sure about the smaller rotor size: but there are two things maybe going on there: In the 3450 RPM induction motor, the armature field is going THROUGH THE CENTER, and in the 1725 RPM motor it is going in 4 'semi-circles', sort of 4 arcs. thus a longer distance (larger rotor) will separate the stator's adjacent poles more, to go through enough metal in the rotor before exiting the rotor again to another(s) other pole... You mentioned Baldor, and the video is implying inductions motors, so he didn't include slip in the discussion. Only synchronous motors run at the calculated values (motors with a PM rotor or defined discrete poles). On an induction motor, the magnetization occurs anywhere around the surface, and is generated by currents 'induced' by the slippage. (if it didn't slip, the rotor would NOT be magnetized into poles!). Standard '3600rpm' motors have a slip of 150rpm (relative) giving 3450 RPM speed. Standard '1800rjpm' motors slip 75rpm yielding 1725 RPM operation... Mr K L [ I apologize if others already said this, no time to look; I'm working on Taxes LOL]

[@ersamatskefski1948]

Can you please answer me if this applies to DC motors as well as AC Motors? I just cant find the answer

[@TimWilborne]

It depends on your field current and armature voltage. I don't have the hardware to make a good video on that.

[@ersamatskefski1948]

@@TimWilborne I mean as a principle when you calculate the rad/s runner speed with given rpm and different sets pole pairs

[@Vmaxfodder]

I have a scooter hub motor that is 15 pole pair? and a fardriver ND 84530 the problem is the driver is 14 or 16 pole pair settings only (so in the middle ) . I think the motor gets a little hot and self disconnects the hall sensor? does this pole count make the motor run hot ? when it works it is a most wonderful scooter for about 30 seconds . then have to wait for it to cool down to reset . any thoughts would be very welcome ! thanks !

[@TimWilborne]

That wouldn't be an AC motor like we are talking about in this video. It is likely overeating because of an incompatible voltage or too much load

[@Vmaxfodder]

@TimWilborne thank you . I have 530 phase amps going into a 2800 watt motor @ 86-100.8 volts . Maybe need a bigger motor? 🤔 I found out last night . Thanks for the idea !

[@andrewel5383]

Maybe stupid question but, does this mean the less poles a motor has the faster it will theoretically go? Like a 3 pole be faster than a 9pole with the exact same three phase ax source?

[@TimWilborne]

Yes, but poles will always be even when talking about RPM

[@tommyov1]

does the torque go up with poles

[@TimWilborne]

No. Because motors are rated based on horsepower so while doubling the poles would in theory double the torque, the winding sizes are also cut in half.

[@IceyJunior]

So the poles are actually indicating how many sets of stator coils it have? Not the rotor coils right?

[@TimWilborne]

Correct, the rotor doesn't really have windings.

[@Dc_tech386]

I have a question how many number of turn is used in a 2hp 2 pole motor as in main winding

[@TimWilborne]

I don't know and would guess that there are many more variables that would determine that Daniel.

[@randomvideos8657]

which is much better. Star winding or Delta winding ? thanks

[@TimWilborne]

Neither, star and delta wiring has to do with what voltage you are connecting to the motor.

[@michealdumasii5432]

If I'm connecting 80v battery with a Delta double Star connection could it be possible to double or step up the output voltage with those connection? If not how can I double my battery output for a higher voltage motor

[@aijazshaikh7621]

Thanks friend,very good and very simple way to explain abut Speed o motor with pole relation.

[@TimWilborne]

You are welcome

[@carlosquispegaldos3665]

Clearly explained, thank you for the work you put in the video

[@TimWilborne]

You're very welcome Carlos!

[@ahmedayaz1972]

@@TimWilborne *SIR VERY VERY INFORMATIVE VIDEO IN JUST **3:20**sec*

[@callmesir4240]

Hi sir, my question is how many poles can they manufacture in a single motor? Can it up to 30 poles?

[@TimWilborne]

Not sure, great question!

[@lopnajhardcoremetal7686]

sir, do you sell 8 poles generator? 5 to 50kw?

[@TimWilborne]

No

[@jujuon9013]

hi sir..is this applicable to both single and three phase ac motor type?

[@TimWilborne]

Yes it is

[@jujuon9013]

@@TimWilborne thanks a lot boss

[@wondersofcreation7095]

If I lower the RPM will it affect the Hz ? Say for instance , we use 50hz electricity which is 3000rpm and the motor am using to turn the alternator am working with is 1800rpm and so the alternator is not generating power, what should I do please ?

[@wondersofcreation7095]

Awesome, very helpful but how do I insert the poles to get a 50hz alternator and how do I get the poles ? Again, I like to know, what happens to to the generated power when you reduce the rpm since it changes the rpm ?

[@TimWilborne]

The formulas and 50 Hz information is at the link below. twcontrols.com/lessons/motor-poles-amp-rpm

[@refaelisrael411]

hi , very good and clear explanation for the motor, i have a question about the rpm of generator , how i calculate the speed (rpm) of generator with 10 pole ?

[@SA95614]

rpm = frequency * 60 / (pole pairs) So lets say your frequency is 60Hz, and you have 10 poles (= 5 pole pairs), your rpm = 360

[@alexandres8846]

the poles of a motor is the analogy of a gearbox transmission to more poles more torque and less speed while the electrical power remains constant.

[@aim3117]

Simple and clear explanation sir, would be great if you can add some animation how Hz and pole influence speed.

[@TimWilborne]

Thanks!

[@Modollas]

Is that a K?

[@richnvick9281]

If I have an ac motor Which is 110v, how doi rewind so I can run off a lower voltage? 12v- 36v area if possible

[@TimWilborne]

12-36V, I'm guessing you are talking DC? Not possible.

[@manush1119]

If I get a 2 pole motor, is there a special esc for that ore not

[@TimWilborne]

I'm not following what you are asking

[@manush1119]

@@TimWilborne 2 pole motor ore 4 pole, do you need a special esc? I. Saw someone wase. Explaining that esc for 2 pole motor Nother esc for 4 pole motor what the hell is that

[@TimWilborne]

@@manush1119 Is ESC an abbreviation for something? I'm still not following you.

[@manush1119]

@@TimWilborne 2pole motor ore 4 pole motor. Do I need to change esc to run them ore. Use same as I use. On my regular brushless

[@TimWilborne]

Some of the abbreviations you are using are not translating.

[@itsok2902]

How much the pole for 1430rpm 3 phase 7.5kw

[@Abdullah3055]

How about winding size in relation to Number of poles.

[@TimWilborne]

Not sure, out of my league.

[@ARTOFPATIENCE]

your explanation is flawless.....thanks

[@TimWilborne]

Thank you. Let me know if you have any ideas for new videos!

[@TimWilborne]

@@ARTOFPATIENCE That is out is the realm of this channel. Check out some of the engineering channels out there.

[@wenskun8765]

Sir, thank you. how can you find the rpm for dc motors?

[@TimWilborne]

It depends on your field current and armature voltage. I don't have the hardware to make a good video on that.

[@CasamTheAnimator]

You could actually make the motor turn in both directions, by adding a dial, if you connect negative to negative and positive to positive, the motor will turn in the correct direction, if you connect negative to positive and positive to negative, the motor will turn in another direction.

[@TimWilborne]

No not in this case. We're talking about alternating current in this video. There is no positive and negative.

[@CasamTheAnimator]

@@TimWilborne I know.

[@hyrulemasterchef9573]

Hi ! Question. I googled this because my hyper scooter has a setting “pole pairs” the scooter came it was set at 20, but you can turn it up to 100. Is higher better?

[@AH-td2ho]

What happens if the hz are increased, say 200hz or more

[@TimWilborne]

Motor speed is proportional to Hz. So if you have a base rpm of 1800 at 60 Hz then 1800*200/60 would be 6000 rpm. However your motor would burn up shortly after getting there if it even managed to. Torque falls off as Hz increases, bearings aren't rated for it, and the motor windings will overheat. I hope this was a philosophical question.

[@AH-td2ho]

@@TimWilborne Am working on Ev and i have a few queries about those motors, can we discuss this via email or WhatsApp? [e-mail]

[@melvinbuthelezi9373]

Good work Sir,so why we divide poles by 2?

[@TimWilborne]

One is north and the opposite is south... alternating 60 times a second 60 Hz electricity

[@abiodundamilare8571]

Very interesting and well explained. How can I make the connection for 3pole at 2780rpm

[@TimWilborne]

Check the motor nameplate.

[@abiodundamilare8571]

@@TimWilborne noted... Thanks

[@abiodundamilare8571]

@@TimWilborne Pls , kindly advise what determines the higher Rpm and lower Rpm of an electric motor. Is it the number of turns or the connection at which the poles are connected or the both?

[@robertohvargas]

Clear as water, thank you very much!

[@TimWilborne]

You are welcome!

[@FirstLast-tx3yj]

@@TimWilborne I have a crank with magnets on its pulley. The magnets are turning around a 6 pole 18 slots stator that charges a 12v battery after going through a rectifier that keeps the voltage controlled since the crank turns 12,000rpm. I was thinking about rewinding the stator into a hub motor adding a second battery and a controller in order to recharge the 12v battery and the 2nd battery and also drive the crank or boost its torque when I flip a switch for 10 seconds. Will this work? What are the main difficulties of such system?

[@Ghettochild.2600]

How about for a 6-phase 3-pole motor? I'm a little confused as I thought the poles where how many windings the motor has. I was trying to use the equation for this fan. It looked like 6-pole thermalbench.com/2016/10/31/be-quiet-silent-wings-3-140-mm-high-speed-fan/ On page two it says "These fans use a new IC motor with a 6-phase, 3-pole design" but I have a feeling that is a typo and meant to say 6-pole 3-phase?

[@TimWilborne]

Hi Kurt. That fan uses a DC motor which is different than the AC poles and RPMs that this video is talking about. I probably should touch on DC motors sometime.

[@vadkazargaming1766]

How do i ger the pole?

[@TimWilborne]

Not following your question.

[@romnellejohnco5887]

Can i replace my motor on my compressor to 4 poles from 2 poles? anyway, thanks alot

[@TimWilborne]

You could but it would be a bad idea. The compressor itself probably isn't rated for the higher RPM.

[@romnellejohnco5887]

@@TimWilborne which is higher rpm? 4 or 2 poles

[@TimWilborne]

@@romnellejohnco5887 At 60Hz, 2 Pole is 3600 rpm and 4 pole is 1800 rpm.

[@romnellejohnco5887]

@@TimWilborne thank you sir. I learned

[@TimWilborne]

@@romnellejohnco5887 You are welcome.

[@abrahamas7299]

Thanks It is very good explaining

[@TimWilborne]

You are most welcome

[@SS-uf3de]

Awesome!!! please make video on 5hp 3phase motor rewinding

[@Andefir]

easy to understand explanation, thanks!

[@TimWilborne]

Glad it helped!

[@azizadurbayeva8224]

its very good video .Thank you so much

[@TimWilborne]

You are most welcome Aziza.

[@shivshankar3211]

3phose endecson motor 18 kw ka RPM Kitana hai batao

[@carlomiranda3799]

Thanks Tim! Subriscibed.

[@TimWilborne]

Thanks for subbing!

[@schizophrenia9816]

thank you , great video !

[@TimWilborne]

You are welcome!

[@shivakumarchitikela9947]

Thank you mr Tim

[@TimWilborne]

You are very welcome

[@muhammadraiz435]

Nice sir great job from Pakistan

[@TimWilborne]

Thank you!

[@hzpower745]

You should explain how lag affects the actual speed of the motor

[@TimWilborne]

A lagging power factor won't affect the speed of an AC motor but as your motor is put under a higher demand you will get slip which is what is required to produce more torque. Both power factors and slip are fascinating subjects, I might have to come up with a creative way to show them.

[@owlman8456]

Why the MAX speed of an AC motor is 3600rpm (USA) and 3000rpm (europe) and why we don t speed up the motor to a high RPM if we want that, such as 6000rpm (100hz) or 7200rpm(120hz)and is this possible????Or maybe 3600rpm is the better RPM and we can t change that in USA or EU??? PLS answer to me!!😀😀😅😅

[@TimWilborne]

Hz is part of the RPM equation, so the lower 50 Hz will run at a lower RPM. See details at the following link. Why not 6000? Because the bearings wouldn't hold up. twcontrols.com/lessons/motor-poles-amp-rpm

[@hetanhawke2354]

great work Mr .thanks

[@TimWilborne]

You're welcome!

[@geoffculp2019]

Vacuum motor has brushes and no magnets. Motor sounds like 20 to 30 thousand rpm. Guess the magnets can't get to hot n loose guass strength all electro magnets. Seems the lower resistance windings lower amount of poles are faster. Takes alot of amperage to push there speed under heavy load though.

[@jaknil]

You forgot to add the link to electroboom! Thanks for making informative videos!

[@TimWilborne]

Yes, I would hate for him to RECTIFY me! kzbin.info/door/J0-OtVpF0wOKEqT2Z1HEtA

[@gurjantsingh6647]

Very good knowledge

[@TimWilborne]

So nice of you

[@Adgale]

you deserve my suscription ;)

[@TimWilborne]

Thanks!

[@varietygamerbd3661]

What is rpm?

[@TimWilborne]

Revolutions per minute

[@varietygamerbd3661]

@@TimWilborne thx

[@TimWilborne]

@@varietygamerbd3661 You are welcome.

[@बेनाम.शायर]

how to calculate turns for single phase 24 slot 4 pole 1440 rpm core lenth 3.4" inner dia 4,4" nd outer dia 7 inches

[@TimWilborne]

That's a little out of the scope of this channel. Google "calculating motor turns". On second thought, that might be a fun one to do with the kids. Maybe we'll make a homemade motor.

[@gurjantsingh6647]

Nice video

[@TimWilborne]

Thanks

[@raymonroe1983]

Awesome that's what I expected. Now the question is how does this relate to torque output. Does increasing the poles to reduce the rpm greatly effect the torque output due to less inertia?

[@Zapgod]

Torque output requires higher current draw. In a 2 pole motor there will be gaps where flux is not at it peak due to the rise and fall of ac sinewaves. Torque is strongest around the center of each pole when energized. This area is called the torque angle. The more poles there are the more torque angles exist thus increasing torque. To achieve higher torque at 2 pole, the motor would have to be rebuilt to withstand the current draw i.e. increasing turns, wire gauge, wires on hand, redesigning for higher voltage, or wiring in delta; or a combination of each.

[@raymonroe1983]

@@Zapgod Nifty. Thank you for the answer. I thought that may be the case but I am limited on this field of knowledge.

[@labibahmed6140]

good . from Bangladesh

[@TimWilborne]

Thanks!

[@JaiSingh-rb2oe]

Good job

[@TimWilborne]

Thanks Jai Singh!

[@phepdhosl7697]

Thanks sir

[@TimWilborne]

You are welcome.

[@venishraja4888]

Why this happened?

[@TimWilborne]

See if this video helps. kzbin.info/www/bejne/b6iwmKKpZtCBZ9U

[@Zapgod]

(120xfrequency)÷poles gets you the speed of the motor.

[@TimWilborne]

Yep

[@impactodelsurenterprise2440]

Is it even easy to find an 18 poles AC motor?

[@TimWilborne]

Yes, they are out there.

[@ishansithara345]

50hp...750.rpm..4 pols connection ..how to

[@sureshlingabathina]

Good

[@TimWilborne]

Thanks

[@Jkauppa]

pure dc brushless (not bldc) motors

[@Jkauppa]

dc emf motor

[@Jkauppa]

holy crap, people make ac motors because they need to be paid for more complex ac motors explaining

[@mr.write1433]

More torque though

[@TimWilborne]

Maybe...but probably not. You comment was vague so I don't know if this is the conclusion you are jumping to but many people say that doubling the poles doubles the torque...the part they leave out is that a 5hp motor with double the poles is a 10 hp motor. A 5hp 2 pole motor will have approximately the same torque as a 5 hp 4 pole motor. In one of the other videos in this series, there is a great argument between two people over this very statement. In the end, some motor specs gained torque on their 2 pole equivalent and some on their 4 pole equivalent. There are too many variables involved to make a blanket statement.

[@sachinkumar3881]

Sir 60pole rpm

[@TimWilborne]

Whoa that is a lot of poles! You can probably see that rotating without any blur. RPM = Hz* (2 / poles) * 60 RPM = 60 * 2/60 = 120 rpm at 60 hz