Brushless Motor Numbers Explained (KV etc)

Рет қаралды 451,781

10 жыл бұрын

Similar to the LIPO overview from a while back here is a short video to cover the basics of brushless motor numbers and stats.
You can see more detail on motor selection on some of my other videos.
Thanks for watching, please comment and subscribe.
Happy flying!

Пікірлер: 480

@rexthecuber7203 Ай бұрын

still helping 10 years later, thank you!

@SteveLoves2Fly 7 жыл бұрын

Great info. I was so confused until I found this video. Thanks for sharing.

@thatfeeble-mindedboy 5 жыл бұрын

This helped me so much… You are a naturally gifted teacher. I think neodymium magnets in motors, brushless motor technology, Li-po battery technology, all these things that have caused the RC hobby to advance by leaps and bounds in recent years are going to work their way into every day technology in other areas and become game changers beyond the scope of what is now understood. I would see these motors and batteries advertised in hobby magazines and while they appear to be very fast and powerful, I didn’t understand any of the information that was talked about in the ad… This video cleared so much of that up for me, but I’m still just getting started. Now headed towards your video about batteries… Definite new subscriber! Thanks again so much.

@steves6557 9 жыл бұрын

Thank you for taking your time to share this info, you have provided me with greater understanding to select a brushless system for an RC car.

@AdoptedYooper 2 жыл бұрын

The best video on motor sizes and designations that I have found, no doubt. Fantastic job!

@MarwanElkordy 2 ай бұрын

Such a great informational video. Thanks for the effort you put into making this information very clear.

@DelQuad4X 8 жыл бұрын

Thanks for this! I sort of had an idea and grasp of the designations, but as you and everyone else has probably been aware of, every manufacturer has their own concept of numbering schemes. Albeit kinda/sorta following a common system, I found from one to the other slight differences that confused me. Now I can look at them with better clarity!

@DuaneMorrisPhotosByDuane 7 жыл бұрын

Thank god you exist in this world! I haven't been able to wrap my head around all these numbers since I started designing my own hexacopter. I have only been an RTF owner and pilot. I think I'm going to have to see all your videos now!

@Painless360 7 жыл бұрын

Welcome to the channel! :D

@user-zb4yj3cj2d 2 жыл бұрын

#*#&>×>28÷

@19440116 4 жыл бұрын

Thank you: you are giving very clean and clear information: I like it!

@rcpilots1291 5 жыл бұрын

Great explainer, thanks a mill for taking the time to simplify all the terminology

@NetechoW 10 жыл бұрын

Your videos have helped me out more than any other. Thank you sir!

@mgee16 9 жыл бұрын

Nice explanation of RC motors. Thanks for the clear descriptions.

@itsjustbonnie6418 Жыл бұрын

your always the go to guy when it comes to rc...best teacher ever

@Jimgoodwin846 6 жыл бұрын

This is a GREAT video! I’m just entering the hobby and this is one of the subjects I was curious about. Very good info.

@Painless360 6 жыл бұрын

welcome to a great hobby! If you're starting out then a lot of the videos on the 'Introduction to Remote Control' series should come in useful..

@65Wildkat Жыл бұрын

A huge Thank you for the information! A grateful beginner from Pennsylvania

@redjr16 7 жыл бұрын

Very informative and helpful as usual. Thanks.

@robertgoldbornatyout 5 ай бұрын

Thanks Lee, Great stuff! Another excellent video.👍👍👍

@TheJJ650 9 жыл бұрын

Excellent explanation. Thanks for this!!

@TheAcydbuzz 3 жыл бұрын

Not new to the hobby but new to electrics. Thanks for the explanation of the ID numbers.!

@davewoundedknee 10 жыл бұрын

Very helpful videos! Love the informative graphics. Thanks!

@gregbrookman 9 жыл бұрын

Thank you. Really useful intro to motors and the numbers

@hairyspeakerz3161 5 жыл бұрын

Thanks for the clear info. Really understandable

@calebjones3062 6 жыл бұрын

oh my gosh, finally a person who will tell people what those confusing numbers are. thank you

@Painless360 6 жыл бұрын

Check out the other videos in the 'Introduction to remote control' series for more videos that explain things in as simple English as I can manage! :)

@rnclucas 6 жыл бұрын

Wow. Excellent job. Nicely explained.

@cesarinocente1703 3 жыл бұрын

Thank you very much for the lesson. Very clear!

@japaullavrigata5526 9 жыл бұрын

Thank you this video was great! getting ready to build my first quad.

@Painless360 9 жыл бұрын

Good luck with the build! Happy flying..

@michaelhalliday2708 9 жыл бұрын

Thanks so much for this explanation...at last I know what all the pairs of figures in the description mean...they have funny great looking symbols sometimes also, but I now know what the values are (e.g. diameter and length) Many thanks! Mike H

@mellyspapa 4 жыл бұрын

Thanks for the info! Well done!

@demiurgiac 10 жыл бұрын

Thanks, I am a newbie and all this kind of stuff helps!

@dibaminecraft 10 жыл бұрын

awesome tips

@patblenkinsopp8382 7 жыл бұрын

outstanding beginners tips...well done..Thanks

@ecstaticasom 4 жыл бұрын

Great info, just getting back into RC models. Not touched anything since I was 14 (20 years ago) so very helpfull

@Painless360 4 жыл бұрын

Thanks for the comment, check out the other videos in the 'RC Basics' series.. Best of luck!

@xMRPx 4 жыл бұрын

@Philip Tomkins LOL! That's funny, I'm the same way. I'm 20 years older than you but I too, started when I was about 13 or 14. I'll stick with the hobby for a couple years, then shelf it for 10 years or so, then repeat the process. I'm just getting back into it again. Almost all my planes have 70"+ wingspans and all of them are built from kits. Since this is the longest I've been away from the hobby (13 years) and my eyesight has changed (i'm too busy to go get some glasses. Well, that's the excuse I use ) I decided to get an RTF foamy for a refresher course rather than use one that I already have. It's an Easy Trainer by FMS and it's really easy to fly. I wanted to get an RTF because all my "old fashioned" ni-cad transmitter and receiver battery packs are no good. They're all on 72MHz, that's what was used before 2.4GHz came out. I need to add some nitro fuel to my list as well. I've got 3 one gallon cans and even though they're all still factory sealed, I don't think any of it will be any good after 12 years. But maybe it will. I'm thinking out loud... Anyways, enjoy the hobby, have a great time and stay well, especially during this pandemic!

@jackdaniels7913 8 жыл бұрын

Long time owner & still unfurl thanks & good luck to any one out there starting off in the hobby today!

@johnrobertson7583 9 жыл бұрын

Nice tutorial bud. Keep up the good work.

@termitehards 10 жыл бұрын

masha Allah nice video bro, something to help with all the guess work up till now :-)

@johncarr123 9 жыл бұрын

This is excellent! Thank you

@surprisepowertv9915 3 жыл бұрын

Good stuff thank you. I took notes!

@xMRPx 4 жыл бұрын

@Painless 360 Your video was very informative and well explained. Thank you for the education.

@stevezvada313 9 жыл бұрын

Very helpful for this beginner. Thank you!

@ilovekitties8643 9 жыл бұрын

thanks for this upload!

@georgevenetsanos7364 8 жыл бұрын

Thank you very much for your help. Best George

@mrgfpv3741 3 жыл бұрын

Thanks very helpful for a newbie like me, Great stuff!

@davidwachter1263 8 жыл бұрын

Thanks for the very informative video. I was wondering what all of these numbers meant and now I know thanks to you. I am building a quad copter and I do not need to buy motors that I will never need. I need a scout quad that I can use to patrol our property. One of our neighbors likes to dump hazardous waste instead of deposing of it legally. If I can catch him on video I can cook his goose. Thanks again.

@Painless360 8 жыл бұрын

+David Wachter best of luck!

@paulcorbett4411 9 жыл бұрын

thanks for sharing this pal...very helpfull ))

@simondm96 8 жыл бұрын

Nice explanation!

@HodgePodgeGarage 6 жыл бұрын

great explanation

@grahamgynn8606 Жыл бұрын

just what I wanted to know thanks for doing this

@avecforte8851 4 жыл бұрын

Excellent video

@stingerbold9327 4 жыл бұрын

thank you so much for teaching us now i can wind my burned motor

@stevedallas007 4 жыл бұрын

great job! appreciated

@4thGloryMonday 9 жыл бұрын

nice job vweryh well explained

@paulmeynell8866 3 жыл бұрын

Brilliant video thank you.

@djamadi100 10 жыл бұрын

Thanks man. I thought that the 3 wires supposed to connect to something entirely. But now I know I can just use the positive and negative., and leave the wire that I don't need out

@Painless360 10 жыл бұрын

Innovation Hi Innovation, the three wires do all need to be connected. If you have a motor that only has two wires coming out then this is a brushed motor and you will need a brushed speed controller to run it. A brushless ESC with 3 wires will NOT run a brushed motor with two. Hope I've not just taught my grandmother to suck eggs there!!Happy flying!

@FooTech1976 9 жыл бұрын

great vid, thank you!

@poeticnight9339 4 жыл бұрын

It's really great....! I never know it....! Thanks a lot.

@MidEats 7 жыл бұрын

Great details thanks

@u.s.f.p.v8466 5 жыл бұрын

U have great content that's informative 🤘 thanks for sharing and keep up the awesomeness 🚡

@prithvirajkanne3629 6 жыл бұрын

One video with complete solution. Thank you bro. Do more videos.

@Painless360 6 жыл бұрын

Over 900 videos already on the channel, check them out :)

@richardhayes200 3 жыл бұрын

Great video with NO crappy music!

@danielschwapp9865 8 жыл бұрын

great video

@danielgnanathikkam6608 5 жыл бұрын

Superb info

@elihaugh4162 5 жыл бұрын

This video is pretty helpful

@hilairemacie1508 4 ай бұрын

Great!!! Explanation!!

@techme061 3 жыл бұрын

thank you , very helpful

@OneTwo-wt8qv 8 жыл бұрын

Yup put this info with the prop video I can calculate the motors needed for my Syma transformation and now I know how to fit motors in the chassis and get the thrust I need to lift. CHEERS!!!

@SouravBiswas-nt1hb 8 ай бұрын

Thank You sir.. It helped me a lot.

@RedneckCanadians 8 жыл бұрын

very well done

@Suprem3GamerDamianWinchester 4 жыл бұрын

This is exactly what I was looking for, for a very long time, thank you so much, subscribed bell on, liked, please tell us about the esc, done.

@Painless360 4 жыл бұрын

All in my RC basics playlist. kzfaq.info/get/bejne/hcB-q8WpsZ3HlJc.html

@philipcolaiacomo1371 4 жыл бұрын

very helpful thank you

@Munzer1977 5 жыл бұрын

very informative video indeed. this is why i like my British cousins

@user-nj7tq8ts2v 8 жыл бұрын

Ok.Thank you very much.

@killsme6957 Жыл бұрын

helps me understand more thankyou sir

@Dronedudevideo 4 жыл бұрын

Thanks learned something in 2020

@FurnitureTube 7 жыл бұрын

spot on cheers

@doktordrone 4 жыл бұрын

thank you very much 🙏❤️🍺

@chaitanyangulhane 7 жыл бұрын

TANKS A LOT BUDDY

@sidamarali3030 4 жыл бұрын

That is some precious information. Thank you very much indeed, sir.

@meareAaron 2 жыл бұрын

vid may be old but its very helpful :) thank you!

@iffsvirgo1 8 жыл бұрын

so good

@dennissmith7055 5 жыл бұрын

Thank you .this is now on my favorites

@LITTLEEXPERIMENTCHANNEL1 Жыл бұрын

Having got back into RC after all these years (where have I been)? Things have gotten a little complicated. You can just buy kits that easily fit for the models your transforming, the only twizz is the mathematics involved. Too much torque bears heavily on the drive-trains. Finding the right electronics/motors/esc's that are more efficient that put you on the "fulcrum" of lastibility/high speed economically needs these informative videos to explain. I have learned a lot from this. You have to burn-out some equipment to learn the hard way.

@Painless360 Жыл бұрын

You can avoid a lot of the guesswork if you know a few things about the model. Check out the motor and prop playlist for the tips and tricks... happy flying!

@1EduRC 9 жыл бұрын

Good Info

@iputuarthawirawan5355 2 жыл бұрын

Thank you

@ISLAMguidanceful 7 жыл бұрын

i wonder if there is an algorithm for the perfect motor, maybe it would have to involve the total weight of the multi rotor divided by 4, and then it would be the highest ratio of torque to that weight

@priti1270 7 жыл бұрын

great

@ColSpade 3 жыл бұрын

Man, you truly are the oracle! Do you do professional consulting?

@Painless360 3 жыл бұрын

I used to in my professional life.. Happy flying!

@superdon1chw 8 ай бұрын

Thanks

@telatcan2453 6 жыл бұрын

you can look at the channel to watch the brushless motor video.

@talatpubg3609 6 жыл бұрын

nice video

@senerkalafat7438 6 жыл бұрын

nice video

@cayofhorror1090 6 жыл бұрын

Nice vid bro

@gstube8597 6 жыл бұрын

nice video

@luckym79 6 жыл бұрын

Is iT possible to use This on a fan so iT Will work true a plug and socket?

@kreynolds1123 5 жыл бұрын

If you have an unknown bldc motor, how does one determine the proper controller. I built a bldc motor and bought a cheap controller that sort of worked with the motor but would sometimes have trouble starting the motor and after about 3 dozen test, blew 2 mosfets on the controller. I can answer any question about the motor's design if asked. A couple things about the motor..... 1) the motor is wired wye. 2) At about 216 rpm, the motor generates 0.126vac across any two coils. 3) The rotor has 12 poles. 4) The stator has 3 coils wound in a 4 turn serpentine or rather falharbor winding pattern for the 12 rotor poles. 5) The copper resistance across any two coils is a tiny fraction of an ohm. Each of the three coils is made from about 80 inches of 16 gauge wire. that should be about 0.027 ohms to a coil. 6) I made my own laminated slotless steel stator to fix the stator coils on. Do i need to buy a meter and measure the inductance?

@dividingbyzerofpv6748 7 жыл бұрын

brushless I can understand right up until timing adjustment. wish motor manufacturers would give more documentation on what should be set up based on ESCs and voltage and load/prop.

@BALLiNAiNTEz 6 жыл бұрын

Great video, its the only good explanation of electric motors iv found. My issue is, how do you size up electric motors for older glow models that dont come with recommended motor sizes ect. Is their a compare chart which would give you a glow to electric equivalent? cheers

@Kimdino1 6 жыл бұрын

First let me state that I am far from expert on this, but I am putting my 2pennyworth in as my advice is probably more helpful than none at all. What I do know is that replacing glow with electric is a 'rule of thumb' endeavour. You cannot just replace a given glow size with a given electric motor, things are a litlle more complicated than that. First you need to look at the power of the recommended glow engine. These are usually given in horsepower, but you will find electric power is specified in Watts. No worry, hp and watts are the same thing just using a different scale (like Celsius & Fahrenheit). There are 746W to 1hp, so just multiply the hp rating by 746 to get the wattage. Generally it takes a basic '35' 2-stroke glow to get 1hp, while higher tuned versions will give more but this is a good general baseline for engine size/ power rating. So divide the recommended engine size by 35 to get the hp for the model. Then multiply it by 746 (as given above) to get watts. Now you are in the area where Painless360's videos can start to help. Start looking at the model type, prop size etc while following his advice and you should get there okay. Remember that most glow engines operated in a practical range of about 15,000rpm (while smaller engines rev higher & larger ones lower). A point also worth remembering is that the power delivery of a glow is very different from that of an electric motor. They have very little torque at low rpm, all their power comes in at high revs, while an electric motor is much more linear. I would deal with this by upping the power required a little bit, solely on the basis that you can always throttle back an overpowered model, while the only solution to an underpowered model is to replace the motor. Of necessity this is very vague but I'm sure that following these rules will get you flying. And I'm certain you will very quickly develop the necessary feel where you can just look at a glow model and say 'that will need an xxx electric power plant'. Or you can just do as I do. Chuck high powered motor in big models, little motors in little models & medium motors in medium models. With revvy motors (& small diameter, high pitch props) in fast models, and torquey motors (with big props) in donkey models.

@RandomVideos-lt3jz 3 жыл бұрын

Can this be used in a rc car for faster speeds?

@Furkan-hd2rh 3 жыл бұрын

Hello, thanks for useful informations. I have a question. Is 1:1 thrust:weight ratio enough for safe flight? I mean for fixed wing aircraft cruise flight. From my aspect, here is the thing firsty, you need to analyse drag of aircraft then you should find stall speed after that your thrust at stall speed must overcome drag. Is this way neccessary?

@Painless360 3 жыл бұрын

Depends on the model type and scale. See my video on it.. Best of luck

@danumbertree2986 4 жыл бұрын

شرح ممتاز شكرا لك

@Painless360 4 жыл бұрын

اهلا وسهلا. تحلق سعيدة!

@karamhaddadin9350 7 жыл бұрын

This was extremely helpful, but one thing I couldn't find out was how to get the amps from the motor

@Painless360 7 жыл бұрын

+Karam Haddadin that should be in the specs for the motor. Sometimes they use watts so you need to divide that by the battery voltage to get the amps. Best of luck!

@AMAZINGRC 6 жыл бұрын

Huge help, Thanks...! Sub and like...!

@ColinMill1 2 жыл бұрын

Picking up on your comments I think it's unfortunate that the specs tend to specify the KV rather than the related torque constant KI. Ignoring efficiency issues KI is related to KV by:- KI = 30/(Pi.KV) so as KV increases the torque constant KI falls. I think it's a common error to assume that (numerically) bigger = better so people are inclined to think that if the sums suggest they need 1500KV then a motor of 1600KV would be erring on the safe side when the reverse is more likely to be the case. The max current x KI really represents the max torque the motor can produce and no amount of tinkering can really overcome that. So in a given frame size the higher KV motor is more likely to be torque limited and not be able to achieve the desired speed of the prop without over-heating. Conversely, if the KV is on the low side you have the option to increase the cell count to increase the speed or go to a slightly bigger and/or higher pitch prop. (going to a smaller or lower pitch prop to try to fix a too high KV motor selection leads to a reduction in aerodynamic efficiency and thrust so is much less likely to acieve anything useful)

@Painless360 2 жыл бұрын

Check out my video series on motor and prop selection. Lots more detail aimed at the newer builder... Happy flying

@giorgioottaviani2841 5 жыл бұрын

Hi. I have some questions related to motors. I hope you will answer to me. I notice that motors for planes have normally higher can rotor than the motors for drones. Why this difference? Comparing motors for planes and for drones with same diameter, same kv and same voltage applied, what are the differences between motors? Considering same motors characteristics, may I use a drone motors on a plane? There is any differences in performance? About propeller, which are the main differences between drones props and planes props? Is it ok to use drones props on planes? Thanks for your attention and replay. Regards. Giorgio.

@Painless360 5 жыл бұрын

That's a lot of questions here are the short answers ;) 1) 5" quad motors are all about speed and performance, planes have more room and don't need to squeeze that much power out of a small space 2) Most of it is branding and hype, sure there are motors with better bearings, magnets and quality control on both sides of the fence. 3) Yes you can, I've used multirotor motors on lots of wings 4) Not by much at all if the specs are the same 5) Drone props are all about speed, plane props tend to be more of a range of performance and efficiency. 6) Yep Happy flying!

@brendendas 8 жыл бұрын

I love your videos mate. Solid knowledge delivery. Just went through your entire Taranis X9D plus playlist and I dont even own one (it's in the mail). So anyways I wanted some advice, I am scratchbuilding a F14 150% tomcat from parkjets.com and it's pretty huge. I'm expecting it to be 4-6kgs after it's fully setup but I have no idea as to what motor to use. The manual tells me to use a 2015-4100 but that'll be too small for this 150 size model. What do you think? Also I have only one motor mount.

@Painless360 8 жыл бұрын

+Brenden Anthony Das It depends on how you want to fly it. There is a rule of thumb that you need 1.5x the weight in thrust for sport and if you want insane performance look at 2x plus! Best of luck..

@brendendas 8 жыл бұрын

+Painless360 I think I prematurely commented without going through your entire video, which explains my exact question. Thanks anyway! 2 times the thrust is going to cost me loads :( Which brands do you use most for airplane motors? I was looking into aliexpress and they have some terrifically low prices on rc stuff, the catch being that some of their stuff is unbranded.

@Painless360 8 жыл бұрын

I'm a cheapskate ;) I tend to use the same motors as the quads and that keeps the spares down. I fly mostly soarers and wings that weigh very little so don't need lots of power. Let me know how you get on..

@Painless360 8 жыл бұрын

I use unbranded, Turnigy as well as others. I try and get motors with decent reviews.. Best of luck!