Wheels brake locking in FOC right before dead stop

ESK8 Electronics
44

single motor or dual?

45

Dual 6374’s

Edit: mine isn’t slow but coming from an evolve i like a little bit of a kick. And i use tb vescs so i limit the initial Kick a little bit with the throttle curves so i don’t pop my babies

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46

alternative setup if ran with no brakes in settings, just came across this…

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47

I can dig that. You should be safe at 60/-40/60/-12. Try that and see if its any better.

48

Will give it a pop bro! Cheers!

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49

Same problem here, dual foc, sensored, foc mode. Breaks abruptly just before stopping from rolling resistance alone. It’s annoying.

50

see my post at

and how i solved it

Cheers

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51

For me it doesn’t happen, or if it happen I’m so used that I don’t usually notice

80mm wheels, 14/34 gearing and 190kv 5055

Could it be VESC 6 vs FOCBOX? Since the later has only two shunts? What are you guys running?

52

Could you share your drive setup? E.g. gearing, wheel size, etc?

I noticed you were running FOC, this hack fixed it for FOC as well?

Thanks in advance, really annoying to be kicked off my board.

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yeah FOC with canbus dual 150KV motors 15T motor cog 66T wheel cog 175 wheels

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54

Thanks I applied the hack… Will report back once I have some results…

What’s your motor and batt min settings?

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55

I did some testing on a single motor board. 90mm Flywheel, the insta-stop isn’t present., 107mm Flywheels insta-stop is there but very minimal. 6in 6 shooters it’s def there. 7.5 in most definitely there. Seems it’s all related to wheel size vs low end RPM.

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Exact same setup just changing wheel size?

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57

That looks interesting. Good job on the workaround :+1:. And I really don’t get why VESC tool doesn’t let you modify this parameter. I posted a feature request on Benjamin’s forum: https://www.vesc-project.com/node/480 Unless there’s something that we’re missing here why this parameter should not be changed for FOC, it should be a 5 min job for him to add it for the next VESC tool release. It was probably just forgotten in the rewriting of the tool…

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58

@SkaterBoy58 This is a great find man!

Thanks a lot for posting the solution, I’ll try as soon as I have time later this week. This is exciting!

@Ackmaniac would you please include this into a future FW update?

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59

From the way that @SkaterBoy58 was able to fix it seems firmware already has it implemented. It’s really just adding the button to VESC tool.

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Has only an effect in BLDC but not in FOC mode. I can try to expose the value. But no time this weekend. Maybe in the next week.

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61

Yes sir

10c

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62

So you mean @SkaterBoy58 solution will not work?

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He mentioned he is running FOC though…