Just wanted to let you guys know, the stuff regarding max duty cycle is on Vedder and My radar.
Vedder has pretty good theory on what is going on, he made the maximum duty cycle limit work better which is somewhat ironic. Basically before as you approached max duty it wouldn’t correctly prioritize Q-axis current (the current that makes torque) over D-axis current (no torque). Now it does this more efficiently which is good, the problem is it causes a more abrubdt feeling torque loss when the limit is come up against and can cause oscillations with some setups since it is a rapid change. The solution is to soften the change as per the setting @Trampa is pointing to.
I’ve talked with Ben about the best ways to add this into the wizard for next release. It does cause a slight decrease in top speed power in the last 5% so people on e-bike or expert users and other applications might not want this limit imposed without being informed.
I have that limit set to 85% on all 4 escs, but still getting oscillations on profile limit 40km/h. When I set 30km/h it’s ok. My setups max should be about 50km/h.
What if it’s also caused by every motor having slightly different erpm? Like when wheels have different pressure, so on the same speed you get little different rpms. But traction control erpm difference is at 3000 erpm…
I just lowered mine from 2000 down to 1000 and it was all sorts of fucked up. What works for you might not necessarily be best for everybody else.
Has anybody else experienced weak torque on startup with HFI? My board only delivers torque once it is well and truly rolling, no off the line punch. Funnily enough tho, in ‘current’ mode, reverse has heaps of punch
I tried inverting motor directions with the same result. Forward sucked, reverse was great.
Personally I wasnt satisfied with the workaround duty cycle current limit start “fix”. It made the full throttle motor wobbling issues go away but my top speed was lacking. It felt like my board was sagging while reaching top speed.
I understand that’s what the duty cycle current limit start is doing but I couldn’t continue to ride with it unfortunately.
Major bummer because I was really liking the profiles feature.
Yeah go ahead and follow the video tutorials on firmware updating and then everything else.
Pro tip: dont think of it as one vesc anymore. It is two separate vesc’s connected by CAN. When changing settings you have to make sure you repect the CAN forwarding. The wizards will write settings to both vesc’s, but manually changing a setting does not write to both unless you write to master, CAN forward, write to slave.
