Brushless motor sizes and numbering explained.
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- čas přidán 10. 03. 2021
- An explanation of what the numeric-sizing of brushless motors means. See our extensive line of motors at: www.rcjuice.com/motor-esc/bru...
If you have any questions please feel free to contact us: www.rcjuice.com/contacts/ - Věda a technologie
Thanks for explaining!
Greetings from Antwerp!
Its really so simple. Apart from the physical size specification and shaft diameter, all that manufacturers need to state is how much Torque, at what RPM and how much electrical Power is been consumed. The rest can be calculated mathematically. I have never understood the purpose behind the kV ratings which indicate motor RPM versus applied voltage, as they are meaningless entities without a known load been applied. Just specify the motors Torque, RPM and Power consumption, and the job is done. The physical motor size is not always indicative of how much work it can do. One day we may see this happen, and most of the questions as to what motor does what will no longer be asked !
so, you will just gear it for correct top speed or adjust how many cells you run?
i prefer to know the KV so i can run my 6S and a resonable pinion and still get the right setup. imagine having a 4000 kv motor and buying a new one with 1500 kv just because the torque, max rpm and watt is what you look for. that will be a slow car x)
Do you want a diesel or a f1 motor?
@@PeterOekvistf1 I’m doing open wheel.
Marketing to the uneducated to take advantage and maximize profit. Thats very obvious
Kv rating is super dumb. "kV" already has a definition, but it's not "kV" (kilovolt) for RC motors, it's "Kv."
Great job. I finally got some answers I was searching for. Mainly motor can size. Most vendors list the shaft size but not the can size. Mainly the diameter. I just measured the OD of a 380 brushed motor and it is 24mm. So now I can simply look for a 2435 brushless motor. It would be nice if vendors included the dimensions of their motors in their descriptions. Again thanks for this valuable information.
To the point and comprehensive. Thank you.
Thank you so much for clearing the muddy waters for me!
Our pleasure, thank you for watching!
Ty very informative video it made lots of sense and educated me on how to outfit my diy projects i got going on. Ty again appreciate you and the rc world for all that they do. This rcing done alot for me.....✌✌👋👋👋👋🎉🎉🎉🎉🎉💙💛💙💛
Thankx Teacher, I learned a few things about what the numbers mean & took notes, lol Now i know.
Awesome video! I instantly had to subscribe!
Double the magnet length = Double the torque at the same kv with same amperage and voltage with identical diameter.
Double the diameter = 4x the torque at the same kv with same amperage and voltage with identical width.
This is due to the leverage x pi and also copper mass.... larger diameter has bigger/more slots with the benefit of added magnetic mass...
Vey nice explanation. Appreciate your effort. Thanks.
Thank you for watching!
Really good explanation. Subscribed!
Thank you for watching!
Thanx for explaining this so well. I'm just getting into this with an empty 40" boat. It's gonna be set up as a 1/6 scale (21 ft.) craft. I don't think I want a 1/6 scale motor. I'm not needing any mind bending speeds out of this thing, just need to be able to get on plane and then a little more. You know,...scale. Any suggestions on where to start with motors etc. :)
☠BLACK BARON☠ Wow, so many sizes and tech specs. A real challenge for RC scale helicopter beginners and non-beginners. Which one to choose without having any "feeling" for the bird. yet.
Is there something special about the vintage Kyosho DM20 brushed motor? It was used in their motorcycles, 1:18 F1 cars and other vehicles. I think it was considered a 280 motor, curious what the brushless motor equivalent would be.
Great info!
Awesome video amazing info on Brushless motor sizes good stuff John great job thumbs up 👍
thanks learned alot
Thank u so much my friend !
John, I'm. Looking for the most powerful/fast motor for my Losi 8ight xe elite. If price is no issue, what do you recommend?
Motor sizing comes with a +/- tolerance of a few mm for sensor/fin variances, got it
thanks for the info
I am looking for a motor the size of the 3rd one you went over but I don’t want anything faster than 2000kv and I don’t want to spend more than $40-$50. Any good recommendations on what to get. Please let me know. I’m putting them in an Exceed rc 1/8 6x6 and I want a little more tire speed but I don’t want to loose the torque so I want a bigger motor.
Thanks for making this video. I am looking to build a video camera slider module. I have no knowledge about this topic. How can I find a motor which can carry 5kg wait easily and very quite and small enough. Could you help me with that please?
Thank you
Thank you. I was always told that the 540 was an indicator of the amount of seconds that it was expected to run - this was back in the 80's. I had a Kyosho with a LeMans 240ST. It certainly was longer that 24mm, so I still have a bit of confusion regarding that.
Oh that's funny!! The old 240ST motors did not correlate to motor size, it was just a name for them so it's confusing.
😂😂
@@RCJuice I did some research and the 240ST was designed for 6 minute heats (240 seconds). Apparently this was the only motor that was named based on the time.
@bharris0128 the numbers on old kyosho motors indeed showed how long they could run. The base was a specific ni-cd battery pack and the number showed how long the motor could run on that capacity until the battery was depleted.
For example: the le-mans240 could run 240 seconds until the battery pack was depleted
All old kyosho motors had this kind of designation, not just one.
Hi would the reedy 680 fitted in mt8 fit gorgon please.Am looking for a strong 100amp esc combo plus to fit gorgon on 3s
I just bought a hobbystar 3674 motor for my stampede 4x4, I'm planning on buying another for my slash. Every 3650 motor I've run gets kind of warm
I have the same but a 3280 kv what pinion are u using for bashing and good speed
Very informative vid. Aren't the hobbystar motors vented around the motor shaft for heat dissipation?
Thank you for watching!! Some models are, but some are not depending on the application.
@@RCJuice but what about tp5870 where it is 57.8mm diameter but 122mm length which is not in anyway related to the 70 in the name
Same can be said about the flagshit lmt 3080 and 30100 motor where niether the diameter neither the lengthatch the numbers what about that??
@@FirstLast-tx3yj They are an exception that has their own numbering that does not necessarily correlate to motor size. The "58" does but not the length.
@@RCJuice but i doubt that they are randomly used
Of course they mean something!!
THANK YOU!!!
Thank you for watching!
Hi! I just purchased an older Redcat Rockslide RS10 online and I was wondering if you know if anything needs to be done to allow for use of a 3S LiPo? I don’t know what kind of ESC it comes with originally. If it can’t run a 3S LiPo, do you have a recommendation for a dual motor ESC replacement along with brushless motor replacement that is compatible with the RS10?
Please e-mail us at support@rcjuice.com, we need some more info or pics of the current ESC.
Very good
Are the mounting screws of the 540, 36 and 40 cans the same? I'm in the process of converting nitro to brushless and wanted to get a the 40 can, but the motor mount says its for 540/550 motors. Will it 40 can fit the mounting screws? Thanks
Most 540/36 motors come with 3mm screws, and most 40/42mm motors come with both 3mm and 4mm screw holes to give you the option. The spacing is the same between both motors, so if you have the physical clearance around it then you can usually bolt an 1/8 motor on a mount designed for 540/36mm motors. In some applications you may need to add some spacers under the mount to get the clearance between the motor can and the chassis plate.
I have a Aeromarine cyclone cat pulled the g260 pum and want to go 60mph-75 with some good running time which esc and motor should I run ? Ty so much love the channels
For a boat that size you will likely need quite a large power system, something in the 1/5 scale motor size (a 56mm can) along with at least an 8S setup but would lean more towards 12S to keep things efficient.
Thanks
Hello, I need a powerful engine to make a Potter's Lathe. It should withstand a minimum load of 50kg. What do you think I should get?
What kit (ESC and motor) do you recommend for upgrading the Traxxas dual brushed motor to brushless? Dont want anything crazy, just a little more speed.
Which vehicle are you thinking of converting?
@@RCJuice my bad lol Traxxas E-Maxx. Dual brushed motors.
Thanks for your video, teacher. Today i received a 1/8 offroad buggy (with out motor and esc). I already have 540 brushless motors (3650 and 3660, 3300kV) and brushless esc. Is there any problem if i use these motors with my new 1/8 offroad buggy? Thanks in advance.
We would not recommend it, a 1/10 motor will easily overheat and can damage the ESC as well if it overheats to the point of shorting out. An 1/8 rig should use a 42mm can.
thank you. i am searching for 4274 motor as your recommendation.
You can use a motor fan too
@@RCJuice hi, I am having an issue with converting my hpi e savage to brushless. There is only a limited amount of length between where the motor sits and the servo . The jrelecs kv2250 is too long. Any suggestions? Thanks
@@shanepeevyhouse5706 How much room do you have?
I’m building a robot and have been looking for/trying to figure out how to find a specific motor. This video definitely helped in looking for specific size, but i am really not sure how to find what I need. If I give you some specs and dimensions, could you possibly point me in the right direction to finding what I need?
Shoot us an e-mail at support@rcjuice.com and we'll see if we can help based on your needs.
@@RCJuice hey there, just checking back to see if you received/had a chance to read my email. Thanks again
Hello RC juice, greetings from Spain. I had just bought a 1/10 car DIY , Im wondering if I mount a 3570 instead of a 3650 will it fit? How I know it can fit. I read shaft is longer. Do I have to buy additional parts? Or it would be the same mounting any of both. thanks very much
In general, motor shaft length is fixed on a motor and there are not options, there are some motors with options for a shaft diameter but not length. The know if the motor will fit you'd need to measure from the motor mounting plate, and up to whatever is behind it that the motor could hit. You just need 70mm of clearance and if so, then it should fit.
@@RCJuice Thanks very much for your quick answer! Its my first DIY 1/10 RC car and im buying all parts:). As you said I have checked and the space limitation is 6cm, so maximum I can mount a 3660. Both motors 3650 and 3660 have the shaft with the same width(3.175mm) but the latter have a shaft 17mm long and the first 15mm. Both will fit? What is the functionality on shaft length(long)? When there is difference in the width is clear that more rpm its better a 5mm but with long I dont know.
@@cesarguerra6039 As far as the shaft length itself, 15mm and 17mm length are both pretty common lengths. They are very close and usually, there is no problem on shaft length being too long, if anything sometimes they are too short. Some applications can require a longer length but again, in general this is not a concern. You can mount a pinion gear in either direction on the shaft as long as the grub screw makes full contact with the shaft. I would not worry about the 15/17 as far as a deciding factor on what motor to buy. For the shaft diameter, 5mm is generally better since it is stronger, but make sure you can get the pinion gear you need in a 5mm bore. Some smaller pinion gears are much harder to find in 5mm so just ensure you can get the pinion gear you need.
Can you explain the difference between "Internal stator" vs. "External stator" brushless motors, please.
This difference is simple: Think of the stator as the part of the motor that doesn't move. Therefore, an external stator is what you see in all of the above examples, where the casing contains the windings and the central rotor is the moving part. An internal stator has the stationary windings in the center, and magnet-bearing rotor sits around that stator and drives the shaft. internal stator motors can either have an additional shroud around the "front" of the motor which conceals the moving rotor, or the rotor can actually just be the front housing, and the housing moves when the motor is running (think quadcopter motors)
Should I go brushless 3000kv, 50A esc and run it on nimh 7,2volts, 3Ah for 1/10 4×4???? please help me because i can't find something useful anywhere!!!
That will work, it's not going to be a blazing fast setup but it will still have some good speed and will be reliable. There is never really 1 answer to these questions which is why it's hard to find clear answers, it takes some experimentation and monitoring of temps to get things dialed in but it sounds like you have a good starting point with your proposed setup.
I have a 3674 -3280kv in the infraction mega 18t pinion n it's slow on 3s full throttle?? Should I go higher in pinion or get a higher kv motor... Thank you
3280KV is pretty high and can be very fast on 3S, so we would recommend gearing up on this case as long as motor temps are still under 170F. Make sure you stay on top of motor temps anytime you adjust gearing, and back it off if the motor starts overheating.
If my kid’s car mounts a 550 12 v can I plug a 570 12 v or it will ruin something. Like the receiver o wiring or other stuff?
Thank you
If you are asking if you can run a physically larger motor then yes, you can. Make sure to monitor temps and adjust gearing accordingly, but yes you can do it.
Hai sir.. my esc hobbywing 120a.. what motor better to use for it, for now i running with 3660 4300kv at my arrma limitles
The Limitless uses an 1/8 sized motor, we would not recommend running a 3660. A lof of guys run the HobbyStar 4082 or the 4092 since that car has plenty of clearance for a longer can.
Ok great...
What about something like a 130 or 180 brushed motor and I want to go brushless.
Is the part to be measured across the" face" the smallest point or largest point ?
Measure the main body at the widest point for the main dimension to figure out the class of motor.
@@RCJuice thanks
How about the Castle Creation 2028 motor? What's the 2028 prefer to?
Castle uses part numbers that do not necessarily correlate to motor size at all.
dear sir,i want to know..what kind of motor that fits for 200a esc.thanks
This can power many motors, please shoot us an e-mail with specific vehicle details and we can help with a motor recommendation: www.rcjuice.com/contacts/
do you have an adapter so i can use your motor 840kv on my max 5 esc?
No adapter, but we can swap bullet terminals for you if you'd like.
I've been thinking about building a large Mystic Bulgarian Cat RC boat over 50" maybe. Two LMT 3100 40KW RC motor generates 550amps max each ? So you would need the MGM-Controllers 800amp ESC because the 500 is not going to be enough ? Ooof Two 800amp Compro and two LMT3100 that's a lot of money.
We would recommend talking to MGM to get their recommendation, but the 550's may be enough if the setup is not too aggressive. Either way it's a pricey setup but the MGM stuff is nice!
Can I use a brushless 2845 - 4400kv on 1/16 rc car without exchange the existing ESC it already has a brushless ESC 7,4v
If it's a brushless ESC then it should be able to run your motor but the gearing and ESC have to be appropriate for the overall setup.
I need help upgrading from the 390 motor with 3in1 esc. what can make my REMO Truck 1621 faster?
Is the current setup brushed, and you are going brushless?
I am designing a displacement hull rc boat around 2 ft 600mm in length. Can I use the Hobbywing 2300Kv Fusion Pro 2-in-1 motor. And do I need a water jacket? Thank You
It could likely work, but from what we see these are not smooth can motors so you cannot use a water jacket. Any motor that is in an enclosed hull should have a water jacket for cooling or else overheating is going to be an issue.
You never mentioned the smaller ones such as 050 130 or 180 to 380...
Am I correct I correct in thinking 1/10, 1/8, 1//5 …refers to scale as applied to cars? Not sure how relevant those are to fixed wing airplanes…
You are correct about the scale being relevant as it applies to cars. I believe, to get the scale of an RC plane, you divide the wingspan of the RC plane by the wingspan of the full scale aircraft. That will give you the ratio.
example, my rc came with 780kv motor and is dead and i look for a 800kv motor! is there a difference between motors?
czcams.com/video/zHpFGPvmibM/video.html
i got a hsp 1/10 buggy and want to upgrade it to a brushless motor setup what would u go for i have upgraded ever think so its heavy and use a 2s 5200mah lipo
Which specific buggy model from HSP do you have?
@@RCJuice think its a
HSP 1/10 buggy xstr i think
Check out this combo: www.rcjuice.com/motor-esc/motor-esc-combos/1-10-short-course-combos/hobbystar-waterproof-1-10-combo-w-60a-esc-and-program-card-1364.html
Basically choose the lowest kv motor size for your application at the highest voltage it can take and trim the esc to not make it blow up 🙂
Does longer or wider make a difference? Or if i got a 5mm wider its the same as a 5mm longer motor
Both will add torque, width actually increases torque a little more but both have the same effect.
@@RCJuice exactly what I wanted to know, my 10 scale can't go wider because the drive shaft to fwd but can got longer by 20mm so I'll fit one and send it 🏎️
So will a 3660 4000kv have the same torque but higher speed potential than a 3652 3300kv motor? The platform for this debate is a 2wd rustler.
They are 540 or 550 because they measure 54.0mm or 55.0mm from my understanding. Even though not all of them are exactly 54.0 or 55.0mm.
You are correct 👍
What does the S stand for in 2s 3s 4s 6s 8s? And why are there no 5S or 7s Motors?
And I still haven't heard a response from this or any channel about what the S means.
CJ N The “s” stands for cells. Each cell is 3.7 volts so 2s means 7.4 volts, 3s means 11.1 volts, 4s is 14.8 volts and so on.
As for motors 2s, 3s, 4s, 6s, and 8s capable motors are more standard. 5s and 7s would just be odd ratings but can definitely have a 5s or 7s build.
Hope this helps.
The S is for the connection "type" used to connect the batteries with each other and to the electrical circuit: either "Series" or "Parallel" connection. The 2s, 3s means that there's a "Series" connection: 2s, 3s, 4s, 5s, as in, 2 batteries connected to the circuit in "series," 3 batteries in "series," 4 batteries in "series," etc. A lithium battery rated to operate at a typical peak 3.7 volts (by itself) would be rated at 3.7v. So, what about 2 batteries in series? 3.7v x 2 = 7.4v. And three? 3.7v x 3 = 11.1v. It's 3.7 volts more with every multiple. YT is dabom to learn about Series/Parallel circuits.
What is better 10,5 brushless motor or 21,5 brushless motor
2 very different applications, it depends on what you are looking for: czcams.com/video/zHpFGPvmibM/video.html
Can we put a 1:18 motor to my small car 1;24 size wl toys. I feel it fitsI feel it fits. Can I leave it in red or make it 4WD cause putting a brushless in it
If you have the physical room then yes, you can install it but you may need a larger ESC, and you may also start breaking driveline components.
Esc 30-35 amp? Thank u bro.
@@Young_Dawwah Yes, 30-35A should be fine for most 1:18 applications.
RCJuice why thank I sir. I buy erra and modify them for srift or touring n selling them. I wanna be your student from malaysia
So okay i gues i get where where your going,
But now i would want to into using 2 motors instead of 1. Where would tat take me????
Like the upgrade motor is x kv and divide it by 2 at the same battery voltage?????
You can't run 2 motors off of 1 ESC, you would need dual ESC's and then it would increase power, but not speed.
I get that u cant use one esc but u can maybe use a lower cell batery and be more efficient in power usage ??
Or at least size reduction if you have limited room in a fuselage?
Or what if you run a certain cell battery in other models and you want to run the same batterys and have the recommended power output high performance motor upgrade
How would that relate to using dual motors then
Can I run a hobbystar sensored with a castle esc
Yes you can, as long as the ratings are compatible (amperage-wise).
@@RCJuice so I can run it sensored thank you very helpful
What’s a 540 brushless motor again ? I’m out.
HobbyStar motors are official these Cans got that energy. HobbyStar please 1120 coke can thank you in advance.
It finally dropped I’m going to get one soon.
What does the T mean? I see like t17, t4.1 etc.
"T" can refer to motor "turns", but those numbers are nt typical turn ratings. Do you have any specific motors/links you can reference so we can check for you?
www.toprc.nl/team-orion-neon-17-brushless-motor-3280kv.html
Like here.
Im looking for a nice big pants toy. Ive seen a kraton 8s v2 (1/5) brand new and a corally jambo xp 65 2021 (1/8) also new. Both advertised on a advertising platform for new and used stuff locally. Wich would be the better choice they both look great but i don't know swat about it to be honest to make a good considerate choice.
@@mellowbug "T" in that sense stands for "Turn". Many race motors are rated by turn like old brushless motors, because most of them have adjustable timing which affects KV. This motor you linked to is a 17-turn, but has fixed timing so is rated at 3280KV. "T4.1" is the model name of an older race truck by Team Associated, not sure about any motors with the designation.
What does 390 and 380 mean?? Is it 540 550
380 and 390 motors are 380/390mm long (small scale motors.
I want to upgrade my arrma kraton 4s v2 blx to 6s 🙏🏾 someone help me
Email us at support@rcjuice.com and we'll be happy to help.
The size of the motor doese it mean more power
Not necessarily, the KV rating has a lot to do with power but in general, a physically larger motor has more power potential than a smaller motor.
@@RCJuice higher the kv the more power
@@nickwilliams6869 More RPM and horsepower yes, but not more torque. "Power" is a generic term, a lower KV motor has more winds of thinner wire, it will carry more volts at fewer amps and therefore will produce higher torque.
@@RCJuice so i can run a higher battery long as the voltage is the same
@@nickwilliams6869 Yes, increasing capacity will increase run-time.
Howsit, to anyone who can help me out here, I’m more of a nitro person so I’m new to the electric world, Iv got an old tomahawk bx 1/10 scale which I’m wanting to convert to brushless, Iv been eying up the 3674 motor as it’s the longest I can fit on the chassis but my issue is I’m not sure as to which esc to run or what batteries I’d be able to run on it, wanting a balanced build with mega power, I’m willing to throw money at it so I’d rather get some advice from people who know their stuff before I end up wasting money and buying stuff that isn’t compatible lol, any advice anyone could give me I’d greatly appreciate it 🙏🏼
It really depends on the KV you select and the application, most 1/10 scale is going to end up with either 2S or 3S. Since it's a larger 1/10 motor most likely 3S, but check out this video for some great info on KV/Voltage/Temps: czcams.com/video/N83dcvcAYrs/video.html
@@RCJuice Thankyou for the reply! I appreciate the info!! Iv been recommended a 4068 and a 3660 motor what you’re thoughts on them?
@@chadrautenbach574 What is the application? A 4068 is an 1/8 sized motor, but plenty of 1/10 cars will accept them. The only issue is the KV's are generally lower because most 1/8 rigs run 4S and up so on 2S or 3S you may not be happy with the top speed.
@@RCJuice Iv given up with that build man, old chassis and parts are hard to find for it, I was wanting to convert the tomahawk bx buggy 1/10, Iv just brought a kraton 6s to get me going and honestly what a machine
Look at Tamiya for source is my guess.
So a 370 or 380 Mabuchi would be...? [:\
One of those weird exceptions :) 28mm diameter motors.
Castle and spektrum sizes are still a mystery js
Yes, they are....
Lol my first rc car has a 3670 bruhsless motor and my second a 56113💀💀💀
Losi dbxl-e 2.0 fox edition
Good video but sound quality horrible, muffle the echo please.
I'm so confused my 1/8 has a 3660 in it
We have seen a lot of off-brand cars that come with under-sized motors from the factory. It's not too uncommon to see 36mm cans in 1/8 cars/trucks (they do usually run a longer one like your 60mm can), but an 1/8 car is really best served with a 40/42mm diameter motor.
@RCJuice I have the arrma typhon
@@jabarimorgan5840 I believe the Typhon should come with a 2050KV 4074 1/8 motor, their 3660 motors are used in 1/10 scale cars.
540
He could compare rocks (there all the same ju some of them look like this and some look like that I don't really matter just rocks 😂
Do you think the reason the finned motors will have a true outside diameter measurement, for the purposes of fitment for custom builds? Maybe not so much for nefarious purposes. Of course you're probably right, cause capitalism.... But if I'm trying to make positive assumptions, I would figure that they're just trying to be helpful by reminding you about the extra couple millimeters to consider when motor shopping for you're custom rig build.
I think I’m even more confused after watching this video 😣
I bought a 3650 3600kv motor and upgraded my FTX Carnage with it. My question is what does the 3650 in front mean?
36mm diameter, 50mm length.
@@RCJuice Cheers dude appreciate the reply
what does the 5 mean