This design demonstrates DC motors driving a feed roller and a drive roller. The PID-based motor controllers minimize
the error between the paper velocity produced by the roller and the target profile
velocity produced by the Target Profile actor. The tracking error input allows one such roller to
track the other to remove small differences in paper velocity.
The target profile is either a profile from 0 to maxPaperVelocity starting at time 0 and
reaching the maximum value at time Interval seconds. The profile and its derivative are continuous.