I bought a VESC 4.12 and faced a problem with running it on 12s batteries
my set up is:
190kv sk3 motor;
4 * 3s 5.8a batteries in series
bt2b
vesc
i made an configuration for my remote, but when im starting my board with 12s batteries, and slightly touch the trigger (10%) motor becomes insane and goes to 100% of max rotational speed on about 3 seconds. the rest 11-100% of trigger are doing nothing. No change of rotation speed. BUT! If i use 9s, 6s, 3s batteries, motor controls by the trigger very accurately - i give 10% throttle - motor spins at 10% of max speed and so on i give 50% throttle, motor gives 50% power
Interesting part with ppm config that,
max pulsw. shows with 100% trigger: 1.85 pulsw.
0% trigger: 1.37 pulsw.
min. pulsw. shows with -100% trigger: 0.49 pulsw.
Deadband: 0.15
But if i use this values, than with 0% trigger (doing nothing) it shows 63% on display scale. and board going somewhere even if i turn off remote
So, to make display scale show around 50%, i used this walues:
max pulsw. 1.93 pulsw. now with 100% trigger scale shows 93%
0% trigger: 1.38 pulsw.
min. pulsw. : 0.78 pulsw.
Deadband: 0.15
Now, if not touch trigger, motor is not rotating, BUT! if turn remote off(scale moves from 52% to 62%), motor still starts to rotate,
so i changed Deadband: 0.25
and it solved the problem.
But how can i change configuration to use 12s batteries with full control motor rotational speed by my remote? am i missing something?
I recommend you to use my firmeware mod. There you can adjust min, center and max pulsewidth. And you can use a setup wizard that makes is easy to get the settings right. And in current control it is normal that when you give only 10 % throttle that the wheels will spin up fast. When you stand on the board it is a completely different story. But in the bench you need only very very little power to spin the wheels fast.
That’s absolutely normal. On the bench only a little bbit of power is needed to spin the wheels at full speed. Try it when you ride it. then it works. You don’t control the speed of the wheels with the remote, you control the power output.
What you mean is duty cycle or PID control. But don’t even try it. The board isn’t usable with these control modes.
If you did a mod to the gt2b controller like badwolf/madmunkey you need to limit up travel on the the trigger to set up failsafe properly. The pulsewidth need to be close to 1 and 2 to be able to set failsafe at exactly 50%
