Hello guys, I am a newbie in e-skating and actually also in skating world. Nevertheless I am to building an e-longboard. I need an advice regarding a motor. I am proposed the brushless D-Power BL 6362/120 motor, I guess some kind of German brand, I am located in Berlin. Basically specs are the following:
dimensions: 62 x 60 mm
weight 550g
120 kv
1500 W
battery support up to 12s
price: 40 euros = 46 USD
I wonder if this motor is ok for my setup? I’ve learnt that the less kv i have, the higher torque and lower max speed I get. However when I make some calcs with a standard variables like 15 teeth pinion and 36 teeth spur, 83 mm wheels and 24V battery I get 19 km/h as a max speed. I wonder if that’s acceptable (pls keep in mind I have no clue how fast it means since I tried skate/longboarding 3-4 times).
The items I already have in a setup are:
83mm abec wheels
27 cm long, 9 mm wide, pitch 5 belt
I also understand that I can theoretically increase max speed by using different spurs and pinions however not sure that the length of my belt (27 cm) allows that.
Hi, Michael! Thanks a lot. That’s what I get with the most standard numbers and 120kv:
Does it make sense? I mean I read couple of sources stating “buy the lowest kv motor you can since max speed isn’t that important as torque”. So I would assume I would get a lot of torque, in other words I would be accelelrating very fast with 120kv motor, however in order to get higher speed (than 17 km/h) I’ll have to choose different pulleys or higher voltage battery, right? Is there any other principal advantage of having a high torque motor except getting faster acceleration? E.g. how would this motor behave when it needs to go uphill?
Yes, more torque = more power to go uphill too.
The problem is that with 17km/h max speed you may get bored too quickly.
Almost everyone will suggest you a motor around 190-200kv or getting a 12S battery if your kvs are that low with that motor.
Also your motor power should be probably > 2000w if you want enough power, also it depends if you’re hevvy or not, and how high are the hills you want to go onto, if you’re ~60kg and you keep high torque then it will be ok.
If you go with the second instead you will have more power (2kw instead of 1.5kw) but then you’ll may need to stick with a 6S setup because a 12S the torque may be a bit too low? Also the motor is small (50x65mm) so it could overheat.
I would say that if you weigh less than 150kg then 120kv is waaay too low if you only plan on running 6s. When I started eboarding I had little experience with skate/longboarding in general and my board could do about 25 km/h and after just a few weeks I started gaining more confidence and yearning for more speed. 13km/h will feel like a toy after a very short time.
If you weigh 70-80 kg or less then I’d recommend a motor with around 250-280 kv. It will still give you plenty of torque and a better top speed with those gears.
Of course you could also run your motor in a 12s config for more top speed + more torque. Low kv is generally good, but you shouldn’t go too low.
As far as my first hand experience and knowledge goes, going from 6s to 12s theoretically means double up on torque and max speed and it halves the used amps.
I don’t know about the fancy mathematical formulas tho
I don’t know either , I just found them online and now I’m curious to know if really everything is doubled so there’s basically no point of running on low voltage, if somebody can explain
Hey guys, thx a lot for all the answers. I am about 72-75 kg, hills would be an exception rather than EV every day practice, but nevertheless good to be able to climb some of them I guess. Generally not steep.
Wow sorry for this… I am typing from my mobile! or motors from aliendrive. They seem to have couple in stock. I found one from aliexpress ad well but I am kinda reluctant to trust Chinese also those customs payments I guess.
When I look at these formulas, it seems that torque wont change, bcoz RPM = KV * Voltage and power = current * voltage, if we fit those two equations in the torque formule, the those voltages would just “remove” each other - sorry I don’t know the correct English word, hope you get what I mean.
Hey im from germany too.
You could visit the german forum elektro-skateboard.de . There are also a few people from berlin and maybe someone is selling a motor in the market.
Had a recent email conversation with Bruno from alien drive systems and he assures me all his motors are in stock even though it doesn’t show this on the website.
Could be worth dropping him an email?
Thanks, i am familir with this forum as well! I actually started the similar topic there and got some good input! Shortly: seems like motor should be ok if I use a high voltage battery like 12s. But I still wanna look at the cost factor. Here is the thread:
There is some English at the end - guys were tired of my broken German…
I did a lot of reading and I can’t figure out what gearing to use… I would like to have about 30 km/h as top speed, and decent amount of torque, can you help me? Thanks
or motors from aliendrive. They seem to have couple in stock. I found one from aliexpress ad well but I am kinda reluctant to trust Chinese also those customs payments I guess.