Choosing the right motor kv for the VESC

If you have done your research you have probably found a lot of conflicting information about what KV is “best”. Often times this information is given without regard to system voltage or electrical rpm limits. The VESC has an ERPM limit of 100,000 but I have found that limit to be closer to 60,000 ERPM. Vedder has stated that running higher than this is inefficient but I have also found that it causes VESC failures.

My findings are purely anecdotal and I am not completely sure but a pattern has developed where systems designed with the 60,000 ERPM limit in mind run trouble free.

What does this mean and how do you calculate an ideal motor kv for your particular system voltage? It is relatively simple, virtually all the motors used in eboarding have 7 pole pairs, divide 60,000 ERPM by 7 PP and we get roughly 8570 rpm. Divide 8570 rpm by your system voltage and you will have your ideal motor kv. I like to make my voltage calculation based on a fully charged voltage so 12s would be roughly 50v.

8570 RPM/50v = 170kv - 12s
---------------/42v = 200kv - 10s
---------------/33v = 260kv - 8s
---------------/25v = 340kv - 6s

These numbers are a rough guide, you can go a little higher but use caution. If you a want a smooth running reliable system this is a good first step to help achieve that.

First build - custom deck, enclosure, & LiPo batter pack / DIY anti-spark switch / Enertion mono drive kit & VESC / Bigfoot 160 / Karma receiver
What have u done with the vesc?
New Builder Parts Check and LCD question
Would these component deliver?
Upgrade Questions
Differences within the SK3 Lineup and influence on a board
Tacon 245kv mono drive and 10s4p... Will it work?
Will it work ? help chossing the right motor and pullys
First Build! | Unknown Deck | Caliber II | Single Turnigy SK3 Motor | Enertion Mount | Space Cell | VESC
Dual battery setup ? Two 12s2p to work as 12s4p ? Will it work?
Is a BMS required if I'm using Lipo batteries with VESC
Esk8 Calculator
First Build Help
Podium deck | Caliber II | 90mm flywheels | 213kv | Enertion mount | 5000mah 10s | VESC | 2.4Ghz Mini remote
Are DIY battery packs worth it?
Battery Selection based on Motor
First Build. Need help deciding everything!
My wireing for my dual motor drive electronics
Another VESC problem
Site organization/structure
Paper Delivering Machine ¦ unconfirmed deck ¦ Tb's 6355 190Kv Motor ¦ Tb's Nano Controller ¦ Tb's Single Motor Mount ¦ Tb's 50 Degree v2 Trucks ¦ Tb's EPOWER 10s4p Battery ¦ VESC ¦
Air Blade | Enertion R-spec 6372 | 10s5p | TB single motor kit | Never Summer El Jefe Board
Warhorse | Five Mile Warhorse | 83mm Flywheels | Tacon 160 | Single Drive | 8s4p li-ion | Nunchuk | VESC
First time Build: Reliable Commuter Board, Thoughts?
VESC and S amounts
DRV8302 fault again....(why me?)
Tacon 245kv mono drive and 10s4p... Will it work?

This is seriously more conservative than Ben’s recommendations.
He was saying that 240KV should be OK with 10S.
I think it is because he s using 86000 instead of your 60000.

I hope it is cause that’s what I am planning …


Oh wow, first bit of information I’ve come across about this. Thanks! So this is again an argument for choosing a lower kV motor (if u use 12s and such) if I’m not mistaken

Vedder actually made his calculation based on 3.8v cell voltage resulting in 225 kv at 10s. You have some wiggle room.

Also an argument for a dual motor 6s with high kv. I often wonder how well a quad drive 3s with 680 kv motors would perform.


AH …
Thanks for this information about the battery voltage.
I did not remember that part of the calculation.

Thank you for the info
When u say motors typically have 7 pole pairs what do u mean?

What if you plan on running Dual motors?

I mean they usually have 7 pairs of poles or 14 poles total.

Then you can drop your voltage and go with a higher kv due to the shared loading and lower amp use per motor but it changes nothing in these calculations.


Wouldn’t it be 6 since there are 12 teeth?

@Hummie here we go down the rabbit hole again? What do you mean by teeth?

I don’t know what u mean by poles. There’s 12 stator teeth and 14 magnets typically. How does that relate ?

My vesc is coming from chaka. i will use enertion 6372 190kv motor and 12s3p battery pack from dexter. This configuration should be ok on vesc?

1 Like

im 70 percent sure i saw someone post something about 190kv and 12s on the vesc as a sweet spot

Good to know. The plan was 10s3p pack but i get a really good deal on 12s3p here in canada. Was second hand but still good deal

Correct, it works but it is not ideal. You will lose the top end performance an never reach anywhere near the theoretical top speed.

1 Like

So 10s would be the sweet spot?
Edit: in regards to lifepo4 with a 245kv motor what would be ideal for the longevity of the vesc

8570rpm/245kv = 35v

35v/3.6v per cell = 9.7 cells

So you should be able to use a 10s lifpo4 pack with a 245kv motor.


Ok poles being magnets