You are here

Negative current on full duty

5 posts / 0 new
Last post
zhivko
Offline
Last seen: 3 months 4 weeks ago
VESC Free
Joined: 2020-01-05 10:04
Posts: 4
Negative current on full duty

Hi fellow Vesc users,

 

I am experiencing negative current when in full duty - what is the cause  maybe somebody knows?

I am using Ubox 100V 100A board,

Motor is Crystalyte 5305 v2

Battery is 24s LiFePo4

This is my eBike:

PXL_20240624_215231404_0.jpg

 

Firmware used and vesc tool is 6.0 firmware from https://spintend.com/products/single-ubox-100v-100a-motor-controller-bas...

https://drive.google.com/drive/folders/19hknvr1Skb0jzSKpbtOBUzmIyPnut3Kq...

 

Here is youtube video demonstrating symptoms: https://youtu.be/oFnaHRKeckI

 

Has anybody have any suggestion, what can I change so motor will not experience negative current in max duty?

As seen from image current spipes are up to -5A - where is this negative current comming from?

Screenshot from 2024-06-24 23-58-40.png

 

 

 

thank you in advance

zhivko
Offline
Last seen: 3 months 4 weeks ago
VESC Free
Joined: 2020-01-05 10:04
Posts: 4

It seems that negative current is caused by the noisy adc2 which is the brake and adc1 the throttle. Any idea how to smooth out the adc lines? i already have the filter setting on true.

 

electricfox
electricfox's picture
Offline
Last seen: 36 min 44 sec ago
VESC Original
Joined: 2019-01-01 17:11
Posts: 126

Shield the cable, keep it far away from phase and battery wires and add a ceramic capacitor of for example 10nF or 100nF between GND and ADC2.

zhivko
Offline
Last seen: 3 months 4 weeks ago
VESC Free
Joined: 2020-01-05 10:04
Posts: 4

I FOUND OUT THE PROBLEM

The cables were two close together so throtle cable was causing noise on break cable. Be carefull guys.

electricfox
electricfox's picture
Offline
Last seen: 36 min 44 sec ago
VESC Original
Joined: 2019-01-01 17:11
Posts: 126

You are welcome!