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VESC6 Issues: Battery current inaccurate, positive ramp time, motor current max.

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ESCam
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VESC6 Issues: Battery current inaccurate, positive ramp time, motor current max.

Hello, I am experiencing some issues with my VESC6. Has anyone else seen these?

It seems to measure the battery current lower than the actual current to the VESC. I have verified with a power supply that the values in the RC benchmark window are accurate. The screenshot below is at max throttle, but it is inaccurate throughout the range.

  • How is the battery current calculated when there are no shunts on the DC input? Is it calculated from the phase currents?
  • Is the "motor current max" limit supposed to be a soft or hard limit? I thought it was supposed to be a soft limit, where the motor current would limit at that value while increasing PWM with the throttle, but it seems to be cutting off power to the motor when I reach the limit.
  • The positive ramping time value in the PPM general tab doesn’t seem to work. I experimented by changing it from 0.9s to 100s and the ESC would still ramp at the same almost instantaneous rate.

Thanks everyone vesc6-full-throttle-hacker.png

ESCam
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Here is a picture of the motor current limit issue. Strangely, it is able to limit smoothly at 30A, but at higher values like 60A below, it fluctuates wildly. 

current limiting issue.png

ESCam
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Update on the ramp time issue. It seems like the negative ramp time value actually affects the positive ramp time as well. Setting both the the same faster value increased the ramp time in both directions, but setting one fast and one slow seemed to set both of them to the faster speed. 

I'm still not sure why my batt current is incorrect or why the motor current max isn't working. 

adamclarke1985
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Joined: 2018-04-02 12:45
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hi have you worked this out yet?  i have a issue with my 4.12 vesc and both motor and battery cuttents are low!! 

see in this video 

https://youtu.be/9y2fq14om0g

sp3swj
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Joined: 2020-11-16 01:10
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Hi

old topic :-) but  still actual :-)

 

I made some measurements  and looks like  BATTERY CURRENT is OK   and 40A  is real 40A drawn from battery

 

but one things  is strange in generals :-)

 

 

in "oridinary"  ESC is declared 120A regular current and  760A peek  - this is declared for current from battery

 

  for  VESC  declared current  200A looks   like  this is  PHASE   current  and this is  80A ESC - only  80A  ESC

 

 

 

and how we compare apples to pears  :-)