Today I burned my Vesc 75/300 while testing it without load.
I was using the Vesc since one year without problems in my Surron bike.
Some weeks ago I switched to 16S from 14S battery and had some ABS_Overcurrent faults on fast accelerating at about 380A phase current. Normal riding was possible without problems on lower currents.
Because detection never was well on the Surron Innerrunner motor and I wanted to eliminate the overcurrent faults, today I tried different values in the settings in the advanced FOC motor wizard to see if detection gets better also because of the new inductance measuring while detection.
The Vesc and Vesc Tool were on latest versionnumbers 2.02 and 4.1
Because the motor was not running well in keyboard control I switched Observer Type from "FOC_OBSERVER_ORTEGA_ORIGINAL" to "FOC_OBSERVER_ORTEGA_ITERATIVE" and let the motor run a bit until it suddenly burned.
The motor was running without load, not even attached to the wheel. The motor is fine.
How can this be possible at 20Amps?
How can it be possible to burn the VESC that easy by changing the setting of Observer Type?
Data right after the Vesc burned:
My Settings:
Those electrons really did a number on that pcb :-( For me, changing to higher PWM frequencies helped OC faults with my 75/300 on a custom mid drive ebike at 350 phase amps (i'm running it at 60khz). FYI, I believe you can't use higher than 30khz with V0/V7 sampling enabled so I usually disable this option.
Whoa serious carnage here.
If current limiting is working correctly you are right it shouldn't be possible with such a low current setting.
If the motor is totally fine then must be a dead short from battery positive to negative, on all three phases. I wonder if the cpu crashed?
That is not a rsult from 20A. Obviously there were several hundred Amps flowing. Sure that the motor is still fine? That looks like a proper short in the system.
It happend like I said and its all the data I have. Yesterday I put my other Vesc 75/300 from another project into the bike, with my old settings from before and it was running 380 Phaseamps, 200 battery Amps (11,8KW) without problems. The motor is fine!
Link to forum post: VESC help offered for private persons and companies
Website: www.electricfox.de
We will look inti that.
Wow, that's almost as bad as some of my spectacular pcb blows on older models.
I think there needs to be a bit more help presented about ABS_OVERCURRENT faults, this has blown some of my boards also because user sees that fault and thinks the solution is to INCREASE the current limits. Which is obviously not a good idea!
The correct solution to this is to increase PWM switching frequency to 60khz and turn down the gains on the current controller so it ramps up slower. Then the current limiting has time to react to big increase in current before the fets explode.
I haven't seen all fets blow like this before. Normally its either all in one phase, or all low side or high side.
@Frank: Anything you can say already?
Link to forum post: VESC help offered for private persons and companies
Website: www.electricfox.de
@Oliver: was there a fuse between battery and VESC ? What type / rating ?