Running a single 6374 with the Flip6.6 & 10s3p 30q setup.
MM= 60A
MB= -50A/-60A
BM= 40A
BR= -12
Max 30mph, mostly cruise at 20-24mph. Running this setup for the past 2 months. Hasn’t been an issue besides an extremely hot NC summer day going up a decent hill. Weather was around 95, with 70% humidity. Grade hill was around 15%.
Besides that one time during that extremely hot day, it hasn’t hiccuped at all. Very impressed with how it has been going. Wish I had a dual setup to test it on my dual 6374 or even my dual 6355 setup.
Ok e-riders Tonight ride was with this setup :
Work almost perfect, but on 3 hard long braking, I got the throttle/brake cut … just like that … I got to re-arm it to make it work again … weird and it does report faults just once with a Over Current…
Apart of that got a bit more torque maybe, but it’s still really wick … Got some full throttle time always
I hurry to get my custom motor mount, when I will pass in Quattro mode it should help them a lot !
@Hummie reached out and said flipsky was looking for some help/tips and also wanted to know where to donate and what not. So i put them in contact with BV. Here is the official response from BV (yes he exists) regarding the flipsky dual;
"Hi,
I had a quick look at the document with the feedback, and users seem to have both overcurrent and drv faults. To me it sounds like there are layout problems with the power stage and/or the current sensing signal path. Making the power stage right is quite tricky, and the vesc4 still had some issues after all revisions. I also made some designs before the V4 that didn’t work well at all, that I never published. The VESC6 is the first layout where I got the power stage right, making it run extremely well even on the most demanding setups.
Also, using only two shunts is a lot more challenging for getting the signal path right, as the sampling interval gets very short in the worst case during high modulation. Personally I won’t make new design with only two shunts any more, as three shunts is much more stable and gives a significantly more linear and smoother acceleration. For new designs that focus on low cost, I would recommend something like the DRV8305 with three low-side shunt amplifiers. Three phase shunts with external amps such as the INA240 as the VESC6 has is better of course, but three low side shunts are still far better than only two shunts.
If you want to, I can have a quick look at your gerber files and see if there are any obvious problems."
So thats status so far. Just thought that everyone should be on the same page.
It’s probably not as bad at 30 motor amps with a pulley but I like 100!
Maybe I missed something above but the 6.6 on the other hand is showing totally capable and the few that broke in the last group buy (all by the same person and his suspect motor) flipsky told him to send them back for repairs.
Another ride tonight, and at this end would like to provoke some faults,… and I pretty good to this
Friday night (+22/-22 A Motor 30 batt max and -15 batt min), cruising cool :
Saturday evening same parameters, riding still cool :
Tonight I start with the same again :
And when I want to play a bit harder at the end, trying ±25A Motor and 35A batt max, applying full throttle uphill, I cunt around 8 faults over current … :
Yes, and you could see 7 other at the ends of the ride when I try to reproduce that, uphill or on flat almost from start.
I will run them hard again tomorrow at again 22A/motor so almost 45A max, but with still 35Amps batt max, and then go low to 30a and see if it faults as easy as I made it happen at the end …
All that is cool, test and see the limit of overcurrent, but if you need an urgent braking you still could have Over intensity … this will be a board exclusively for me now and for cruise mode !
Still got this drop from 0 to +40a motor when I’m braking … is it normal ? (after the braking all the over intensity is drop to the motor ?) Look at the end of the last ride
Ok run them today like I say at 22A Motor and 30A batt, I can still make it Over intensity if I really play with the throttle in uphill but somethimes it handle more without problem and sudently, FAULTS !..
Yes, they’re replacing my mini’s actually, I’m waiting them with new caps and then same for this dual I guess.
loading …
Its a chance that the season is almost ended for esk8, and I will be back on my eMTB under VESC6 at 70Amps Motor& batt cause all of this is a lot of frustration
we are so far from that … and they was supposed to be 12s and why not foc !..
I had planned all my setup with 12s ratio etc (got 16A 30C of graphene for this) … and I was locked at 10s 5Ah (just what I got in stock ^^) no sensor, no foc … no luck
But the 6.6 is showing well. Almost no one with a problem with it. …and with the group buy at 125$ it’s a great deal. It uses three sensing shunts not just two as the 4 uses
I hurry to get my custom motor mount, when I will pass in Quattro mode it should help them a lot !
