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Brushless Motor Numbers Explained (KV etc)
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- Опубликовано: 9 апр 2014
- 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.
Thank you for taking the time to watch the video. You can find me on social media at / painless360
/ painless360
www.thingivers...
R/C is one of my hobbies and I do this for fun. I don't do this to replace a day job so if you have found the content useful then and want to support the time I spend helping others and creating content then please consider liking the video and subscribing. It helps a lot!
If this video helped you and you want to support the channel you can use these links:
/ painless360
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Remember that reviews are subjective. Don't rely on one persons opinion - watch reviews and make your own mind up. Where-ever you can support your local R.C resellers and shops, they need your support more than ever.
If you liked this you can see more R/C related videos on the channel - / painless360 , use the playlists to find entire series on topics you might find interesting.
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Thanks again for watching, support each other and the hobby as we have enough external drama without making more for ourselves.
LIKE and SUBSCRIBE and above all - Happy Flying!
still helping 10 years later, thank you!
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.
The best video on motor sizes and designations that I have found, no doubt. Fantastic job!
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!
Welcome to the channel! :D
#*#&>×>28÷
Great info. I was so confused until I found this video. Thanks for sharing.
your always the go to guy when it comes to rc...best teacher ever
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!
oh my gosh, finally a person who will tell people what those confusing numbers are. thank you
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! :)
Not new to the hobby but new to electrics. Thanks for the explanation of the ID numbers.!
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.
A huge Thank you for the information!
A grateful beginner from Pennsylvania
Your videos have helped me out more than any other. Thank you sir!
Nice explanation of RC motors. Thanks for the clear descriptions.
Thanks Lee, Great stuff! Another excellent video.👍👍👍
Thank you: you are giving very clean and clear information: I like it!
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.
+David Wachter best of luck!
Such a great informational video. Thanks for the effort you put into making this information very clear.
Long time owner & still unfurl thanks & good luck to any one out there starting off in the hobby today!
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
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!
Great info, just getting back into RC models. Not touched anything since I was 14 (20 years ago) so very helpfull
Thanks for the comment, check out the other videos in the 'RC Basics' series.. Best of luck!
@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!
Great explainer, thanks a mill for taking the time to simplify all the terminology
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.
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..
Good stuff thank you. I took notes!
Very informative and helpful as usual. Thanks.
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
Thank you. Really useful intro to motors and the numbers
Thanks for the clear info. Really understandable
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.
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!
Very helpful videos! Love the informative graphics. Thanks!
just what I wanted to know thanks for doing this
thank you so much for teaching us now i can wind my burned motor
masha Allah nice video bro, something to help with all the guess work up till now :-)
Great video with NO crappy music!
Thank you very much for the lesson. Very clear!
@Painless 360
Your video was very informative and well explained. Thank you for the education.
vid may be old but its very helpful :) thank you!
Wow. Excellent job. Nicely explained.
Thank you this video was great! getting ready to build my first quad.
Good luck with the build! Happy flying..
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!!!
Very helpful for this beginner. Thank you!
Thanks very helpful for a newbie like me, Great stuff!
outstanding beginners tips...well done..Thanks
Thanks, I am a newbie and all this kind of stuff helps!
One video with complete solution. Thank you bro. Do more videos.
Over 900 videos already on the channel, check them out :)
Excellent video
Excellent explanation. Thanks for this!!
Great!!! Explanation!!
Nice tutorial bud. Keep up the good work.
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.
Thank you very much for your help.
Best
George
That is some precious information. Thank you very much indeed, sir.
Thank You sir..
It helped me a lot.
helps me understand more thankyou sir
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
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?
Depends on the model type and scale. See my video on it.. Best of luck
awesome tips
nice job vweryh well explained
you can look at the channel to watch the brushless motor video.
nice video
nice video
Nice vid bro
nice video
Thanks for the info! Well done!
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.
All in my RC basics playlist. ruclips.net/video/OZNxbxL7cdc/видео.html
This is excellent! Thank you
very informative video indeed. this is why i like my British cousins
thank you , very helpful
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)
Check out my video series on motor and prop selection. Lots more detail aimed at the newer builder... Happy flying
Nice explanation!
Who came here because he loves bldcs, and not for information? Btw good video.
Brilliant video thank you.
very helpful thank you
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.
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!
Ok.Thank you very much.
The one you have 1450kv for example how much Amps min
That sounds like you are new to this, check out the 'Introduction to Remote Control' playlists for more of the basics and how you size things like ESCs and batteries too..
This was extremely helpful, but one thing I couldn't find out was how to get the amps from the motor
+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!
great explanations
i have the same bldc as shown in the video,how do i find out its amps and watt.please help me with this
+Sav job bdlc? Not sure what you are asking.
hobbyking.com/en_us/d2822-12-1800kv-brushless-outrunner-motor.html
Thanks learned something in 2020
The reason I want to know is because the Spektrum rev counter telemetry module needs to know the number of poles to accurately measure motor rpm.
+George Venetsanos for outrunners it's normally the number of magnets on the inside of the can. The higher KV the more there are typically..
can you link the chart that gives the battery capacity Vs no. of blades ? I am upgrading my toothpick from 2-blade to 3, and now wondering if that will have too much effect on the battery life and motors
I don't have that chart. Best of luck!
This video is pretty helpful
It's really great....! I never know it....! Thanks a lot.
i'm trying to make quadcopter for a school project.i'm at a loss as to what motor+prop to choose.my quadcopter needs to be quite fast(but doesn't need to perform tricky manoeuvers),but is heavy(has camera and other accessories).could you please help me?should i choose a low kv + high diameter prop?
+Houidi mohamed amin see our video on choosing motor and props in the 'Introduction to Radio Control' series.. you need to know how heavy the model will be first.. best of luck!
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?
hello painless lots of useful info but i got a question.i have a motor whos label just says 1300kv.and no more info.
can you explain pls.how one can determine motors wattage or the amps.thanks.
mohammad abid You need to go back to the supplier and ask. You can connect it to an ESC and then connect the ESC to the battery using a amp/wattmeter. Places like HobbyKing sell them. Power the motor with the prop (make sure its securely fastened to something) and take a reading of the Watts on the meter.
Best of luck with it.
I'm making an octacopter that should carry a payload of 30kg..what kind of motor should I use for this?
thanks for sharing this pal...very helpfull ))
you say its 10-20% greater esc then motor, but i have heard that to "great" an amount can supposidly cause damage! for example if i had a 25 peak-amp/watt motor and a 150 amp esc i have been told that the motor can burn itself out because the esc will supply it with more current then it could handle. is this true? is their any problem with having a MUCH greater ESC then the motors needs aside from cost?
I'm guessing that's usually from those who don't understand how it works. The ESC doesn't push current the motor can't use. Having a higher capacity in the ESC makes wire that even when the motor is at 100% the ESC isn't at maximum too.. Happy flying
Man, you truly are the oracle! Do you do professional consulting?
I used to in my professional life.. Happy flying!
im build quadcopter, and i notice that 1 of my motor getting hot while the others not. i switch to other esc, some problem occur.. do you know what the cause? or i have to end it up buying new motor?
+andi azhar Could be a few things - I would check the bearings are ok and don't need oiling/replacing. Also you could swap the motor with another on the model and see if the same motor gets hot (in which place I'd replace it) or its something to do with the settings on that ESC.. Best of luck..
the motor going to be twitch when i replace to the other esc, but rotate nicely on 1 of my esc ( which is different type with the another ) , but it cause the motor to getting hot
Motor twitching is usually caused by a bad/broken connection on one of the three wires into the motor. Best of luck..
thanks for your fast respon, i will try my best
+andi azhar Any news on this?
My bloc is running very slow I have checked everything' except lipo what do you think what is problem
+Kartik Raperia not sure what you are describing. What's a bloc?
thank you very much 🙏❤️🍺
great job! appreciated
Superb info
Hello sir one thing more will the plane work if I am not using the tail and the back wings and is I am using a car transmitter to fly a plane is that ok please answer me as soon as possible
+Harsahej Singh I would recommend that you use the right transmitter for the model. With only two controls (steering and throttle) you would struggle to control the model. You really need three minimum for a plane.
Best of luck.
I have a question for you would I notice the difference between a 850 KV to 880 Kv or is there not going to be that much of a difference the reason why I'm asking I have a 850kv in my plane now I want to switch it to an 880 not sure if it's worth the money
A small change, depends on the battery and prop you're using. I have a video out at the weekend (you can see it now in the Ardupilot/Matek plane build series playlist now) that covers this a little..
great video
My 450 size drone with Phantom 1 guts. total weight is 1633 grams. I am looking to upgrade the 2212 motors to accommodate the extra weight. I'm using 2x 3s3000mah 25c batteries and I'm only getting about 8 mins of flight. What size motors would you suggest? I'm using Phantom 3 9x4.5 props.
+Dale Adkins it's not just about the size of Motors, it's also about how big the prop is that motor can spin. For maximum efficiency and flight time you want very large props spinning slowly. See my video where I tested out a high KV motor with a small prop against such a setup and found how much more efficient it was. Best of luck
very well done
U have great content that's informative 🤘 thanks for sharing and keep up the awesomeness 🚡
So, would the black wire be for negative, red for positive, and yellow for??
If you're talking about the three wires from the ESC to the motor then they are neither. See my video on ESCs and motors..
Thank you .this is now on my favorites
Hi,
I have a problem you may be able to help with.
I have a 200W motor and a 40 amp ESC together with a speed controller and a programmer. I am not building an aircraft but a CNC router and need to program the motor and ESC. The motor will be fed with a 12 volt 30 amp power supply. Does the ESC control output lead, feed out the full voltage or is it limited to protect the Speed controller and programmer. Secondly how do I use the programmer to slow start the motor and have if possible computer control of motor on/off and hopefully speed. Needless to say I am a complete novice with this setup but a competent electronic engineer. Any specifications or diagrams pertaining to this would be appreciated.
Cheers MoK
I have no experience using a motor in this way so can't comment on the usage. I can answer the other part of your question though!
The motor that connects to an ESC is basically a three phase motor. The ESC drives the motor by pulsing the full battery voltage very quickly to each of the three phases in turn, the more throttle the more 'on' the voltage is to that phase of the motor. The frequency of these pulses to the next phase of the motor is commonly known as the 'switching frequency' and in an RC model this is directly controlled by the PWM signal on the throttle channel going into the ESC.
Painless360 Hi and thanks for your reply, however the principle of operation of brushless motors is understood so is not the problem, the data available on the ESC, programmer and speed controller is very sparce to say the least so the danger of misconnection is high. Without reverse engineering the devices, the connection of devices without data is not without its mishaps. I require the connection data for the motor, ESC, programmer and speed controller. In a nutshell thats it.
Cheers
MoK