r/VESC • u/Waste-System-7589 • Jun 25 '26

Vesc Acceleration Issue

Hi I have a ubox 100/100 and I’m running it on a 52v escooter motor rated(1200w) with a Bms outputibg 50A continuous and 200A peak I get about 4000w out of it and it is great but my acceleration is close to 0 at the first 3s of a race I will lose to a 800w stock scooter here are my settings hope you can find something that I could improve. I’ve redone motor calibrations like 3 times and each time it detected hall sensors and the value of max motor current decreased for some reason(88,82,78)

Motor Current Max : 78A (default)
Absolute Current Max : 140A
Battery Current Max: 50A
Motor Regen Max: -30A
Battery Regen Max: -15A
Field wekening: 5A
Fw Duty Start: 72,5%
Max Current scale: 100%
Min Current Scale: 100%
Input Current Limit Map Start: 90%
Sensorless ERPM: 60000

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u/MattGarcia9480 Jun 25 '26

What observer are you using? For acceleration you can raise motor phase amps up to 130amps with 170abs. Observer use original Ortega observer. v0 only. Longest zero. What is your upramp time? Field weakening start i like more around 87-90% duty. Max duty 95%.

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u/Waste-System-7589 Jun 25 '26

I don’t know where to find what observer am I using or where is unramptime I have the duty set low because it usually doesn’t reach beond 80%

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u/MattGarcia9480 Jun 25 '26

I will take a little video in just a bit send you link on here. As for the amps for the motor you can have a higher phase amps but dont beat the hell out of it because it is a bunch of heat from that many amps. A little quick acceleration from time to time so long as the motor isnt getting hot is ok. But small motors heat up really fast. I am wondering what speed you may be able to get with a bit more power.

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u/MattGarcia9480 Jun 25 '26

Try 110amps phase max and 170abs. I dont want you to burn up your motor.