There are good YouTube videos for onewheel field weakening settings. Those guys use it because gearing isn’t an option for them.
To be honest, I wouldn’t touch field weakening with a ten foot pole for esk8. Just swap to lower gear ratio or higher kv motors.
Wear all your armors and a full face if you do decide to be our guinea pig 
this^
field weakening is not even across all motors on an esk8 it will make your ride unstable
Welp.
You guys are beating some sense into me…
I think I might leave it alone…
But I do have it running on my two Vesc onewheels…
So I figured if it is ok on a balance board, should be fine on esk8…
I did not think about the motors behaving differently…
@PedroMcJimenez are you running it?
Or maybe he died from running it…
i ran it on a bike and it was great. ran it on a board that was geared for 32mph as i was hoping to field weaken to around 36 for cruising and higher if needed but the motors acted differently and caused the back truck to turn which wasn’t too bad but letting off the throttle would throw it back straight.
Field weakening is great!
Not sure why you guys are scared of it.
As long as you aren’t pulling every amp avalible out of your battery, it’ll Actually help your range.
I use it on all of my eskate and onewheels.
Do yourself a favor: go do a run and save the log. Add 30a of field weakeningat 60%dc.
To do another run and compare. You should have a more effecient log for the same speed.
How would it be more efficient? You’re going faster, which takes more wattage, and you’re having to fight the back emf as well
“Field weakening helping your range” definitely needs supporting facts. Outwardly, it seems to contradict the basic physics happening here.
I’m not going to spoon feed you guys, but the basic idea is:
When you add some field weakening, it lowers your duty cycle.
If your duty cycle is lower then you’ll pull less amps.
With some testing you’ll find a sweet spot where the field weaking amp draw is more effecient than the high duty cycle.
This is much more pronounced if you are riding (staying) at the top end of your duty cycle for longer periods of time. (High speed runs)
It sounds more likely to me that this is an artefact of the logging process and not because less energy is being expended. It would be amazing to put a separate coulomb counter on your setup and see what’s happening. Perhaps there is some interesting phenomenon, but I am extremely skeptical.
Do your motors run hotter or cooler at the same speed and incline with different field weakening settings?
Do some tests for yourself. I don’t have time to dig through logs.
It’ll take you all of 10 min.
I’ve been out of the country for 3 weeks and am leaving again tomorrow. Good luck
Why would it pull less amps when using field weakening? The efficiency of the motor isn’t changing. The esc is needing more switching at lower duty cycle which is less efficient, and with field weakening it’s putting out extra current to counter the back emf.
I don’t have my vehicle under me to compare right now but wondering on the theory.
Example.
35mph+ 0a fw =99% duty cycle
35mph + 30a fw= 78% duty cycle.
The amp rating for field weakening is not actually pulling 30a. It actually pulls a very small amount of power.
If you are running at 99% duty cycle with zero field weakening, you are maxing out your system.
If you are running 78% duty cycle with 30a field weakening, you are still under the max of your system. Making Less heat and better efficiency.
I was building Eskates long before i got into onewheel builds. In the onewheel community this is common practice. It also applies to Eskate…
Also not every riding style or kv will benefit from this. If you are a slow cruiser and don’t get up high in duty cycle this wont help at all and will probably negativly affect your range. (Like most people think)
When u say “max of your system” I assume u mean max speed. Why would running at a lower duty cycle be more efficient though if it’s still the same speed?
As I understand it the higher the duty cycle the less switching happens in the esc and therefore more efficient there, and for the motor it’s the same efficiency regardless of duty cycle as it smooths out all switching
Not going back and forth with you @hummieee
Do some tests yourself.
I’ve seen it first hand and use fw on all of my builds.
Forget what you think you know and give it a shot.
99% duty cycle is maxing out your system. You have nothing left.
78% duty cycle means you still have 22% left in the tank.
99% dutycycle will always be less effecient and cause more heat than 78% duty cycle…
Why?
If u don’t have an answer that’s fine and no need to respond but maybe someone else does.
I don’t really understand it but seems as you say and it’s more efficient to run field weakening. I’ve seen a couple sources saying as much. Here’s one:
I’m still hoping someone can explain it more clearly.
Glad you did a little research, sometimes all is not as it seems
From my experience with our Formula SAE car, field weakening significantly dropped our efficiency. (Top speed runs pulling 80kW vs 100kW+ with FW) It was better to just adjust the gear ratio instead. Not super relatable to ESK8/onewheel though, much different powertrain.
How is the powertrain different to the battery, ESC, motor and gear ratio we use in esk8?