Field weakening on vesc for increased motor speed

efoils – Electric Hydrofoil Surfboards
1

Anyone checked out field weakening on a vesc? Should allow increased rpm past the theoretically FOC maximum. I’d like to try it out but don’t want to risk my working setup yet… Need a backup vesc :grin: or wait until the fall.

2

Unfortunately it looks like it causes a massive drop in efficiency with typical esk8 motors. That probably applies to our motors as well.

3

Yes it would lose efficiently compared to a higher kv motor, but only in the range where the lower kv motor couldn’t reach before.

I was thinking you would only need it in for a boost at times, such as when your are normally maxed out on motor rpm. If you never top out your motor rpm you wouldn’t get any loss of efficiently

1 Like
4

I’m extremely interested in this too. It’s something I’ve always wanted to try on an Efoil. I think it is a much safer platform to test this on compared to dealing with concrete riding a skateboard :grinning_face_with_smiling_eyes:.

I will test it with 12s and a Flipsky FSESC 200A.

5

Field weakening is a gamble on propeller drives due to power increasing exponentially with rpm so it’s best to increase it slowly in steps when you try it. Good luck!

6

I’m running 10Amp of field weakening on mine currently. With my 14s battery I’m not sure I am hitting the field weakening range in the water - but can definitely tell out of the water. Going to try my 12s next, I was constant running into the top end of that battery, so this may help.

1 Like
7

Any news on FW? Settings would be nice. For balance boards, people set FW current rather high, 30A seems standard, some push it even higher. They also set the threshold low, 70% or even lower.
I had to change my vesc recently and installed firmware 6.2 on the new one, so I might try it out. 63100 outrunner on 12S. FW current 20A, start @80% seems hood values to start with.

8

I had been running it at like 80 or 90% with something like 10A if if I remember right. Mostly was just handy in current control so I wouldn’t get the awkward zero throttle response when I hit the top end of duty cycle when I was foiling (and give you some extra speed). Didn’t try and mess with it too much because I didn’t have bluetooth and my VESC was buried…

I got to replace my vesc as well, so hadn’t been riding with it this spring yet. Next one will have bluetooth for some easy setting changes. Also too many good windy days to wingfoil…

1 Like