Speed PID Function

[Tom Line]

Originally Posted by davidthefat

Logically, it is no different than a positional PID. Just the input will be in FPS or RPM (RPM in my case). The only difference will be the constants. Instead of the target being an angle, it simply is the RPM. Same goes for any other unit.

That is incorrect.

When a PID derived for position passes the set point, it reverses the motor. Reversing a motor on a spinning wheel going at 4000 rpm can have negative consequences.

The derivations are different. Once you see the final formula, you will understand why position PID and velocity PID are different.