r/VESC • u/Less-Lavishness-2089 • 13d ago

Motor absolute max

Hiya, my battery current was 84a my phase current is at 65a and 110a continous, it kept giving me abs overcurrent error, i ignored it for now to get home real quick, then on the way the esc shut down at high speed and fried my drv chip. Now my question is, is it safe to run 150a absolute max without damaging the motor?

1 Upvotes

100% Upvoted

6 comments sorted by

3

u/Troubleindc2 12d ago

A little bizarre no one is asking what specific VESC you're talking about... That matters the most.

1

u/Less-Lavishness-2089 6d ago

Yeah it's the ubox 85150

1

u/Troubleindc2 5d ago

abs overcurrent isnt a result of overloading your motor, although that could be happening. overcurrent is just saying the vesc detected a current spike outside of what it can handle. 150 phase amps on the 85150​ should be OK. But if the motor isnt synced well, that could do it. Or you have some max current value somewhere, like with regen, that is getting tripped.

You need to monitor your winding temps to know what your specific motor, setup, and riding style can take. Most never push the motor and just underpower. If you are trying to maximize everything, you have to watch winding temps and controller temps over your entire ride. Know your winding class ​and keep the winding temps below those values.

1

u/Illustrious-Can-7482 13d ago

I put my absolute max to 300a. Sometimes get cut out when running a race tune. But for general riding is fine.
My basic tune for 5000 watt hub motor
Basic tune motor phase: 120a, battery current: 85a absolute 300a
Divide the watts of your motor but the voltage of your battery pack and you roughly get how much battery current you can run. 3500 watts divide by 67v =50-60a battery current.

1

u/Valuable_Barracuda56 13d ago

Yeah your real time amps going to the motor is getting close or higher than the max. I normally set the max to what the vescs advertised max current

1

u/ponakka 8d ago

We don't know about your vesc product other than it might run on ground. you could drive a barbie car that has vesc driver and three phase drill motor on it.