Jerky start off fix?

Danny414 · August 3, 2018, 4:21pm

Any one know what I have to tweet in BLDC to get the take off to be smooth and not jerky from a stand still

Thanks!

Static · August 3, 2018, 4:55pm

Are those sensored motors? If you don’t have a vesc that can safely run FOC give sensored BLDC a try and will remove the start up jerk. The VESC motor wizard makes this easy to setup. Otherwise just give a single push before you apply throttle in BLDC mode.

Acido · August 3, 2018, 5:03pm

Push lightly before presding throttle / get sensored motors / buy a sensor kit

Danny414 · August 3, 2018, 5:13pm

Yeah I have sensored motors and using focbox mode… I do give a push off currently but id like to be able to have a smooth take off from stand still if possible

Danny414 · August 3, 2018, 5:13pm

Thanks! they are sensored and am using focbox mode

accrobrandon · August 3, 2018, 5:16pm

Did u run hall sensor detection during set up? Could be real jerky like that cuz the vesc doesnt actually know which hall sensor is where… Once u push it understands but a stand still it doesnt. After sensor detection it should be smooth.

Danny414 · August 3, 2018, 5:25pm

Yup ran all that stuff… it’s fine after I give it a kick push… was just hoping to be able to take off from stand still smooth too

accrobrandon · August 3, 2018, 5:36pm

Weird then… I have the same sealed 6355s from maytech and I get a smooth start fpr a stop … although I rarely ever start standing at a stop after accidentally busting my ass… Maybe theres something off in ppm settings

… Or maybe double check the halls sensors values got written to the vesc just in case…

Fiori · August 3, 2018, 5:56pm

Your sensors are not configured right. Either detection failed or they are disabled. I run sensor less and that’s exactly what it looks like.

thisguyhere · August 3, 2018, 6:43pm

first, it’s not focbox mode, it’s just FOC mode

anyway

in foc tab, make sure it’s in hall mode, and go ahead do motor detect and calculate, etc
do hall sensor detection
apply
write back to esc

if that doesn’t work your motor sensors may be shot

dareno · August 4, 2018, 1:35am

I know its simple but did you write config/apply settings after the motor detection? If you have a sensor down it will tell you.

Danny414 · August 4, 2018, 4:01am

Oh I did the calibration before but I had sensorless ticked I THINK

GenghisConman · August 28, 2019, 4:19pm

Having the same problem with my unity. Solution?

Ixf · August 28, 2019, 5:45pm

Make sure its in FOC mode. Make sure you have it in sensored mode Make sure the sensor detection actually worked Make sure you saved your setting