Thread: Capi's Gyro 101
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Old 04-07-2009, 07:59 AM   #20 (permalink)
DominicD
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Your thinking of industrial servos RC servos are much simpler beasts. Both Analog and digital use PID controllers. The microcontroller on the digital servo is just implementing the PID controller in software, the output is a PWM signal not a bang-bang type of system as you seem to be describing. The holding power from the digital servo is derived from how often the controller implements a new correction, aka it has a higher closed loop bandwidth. The digital servo still has a PID controller which under most cases is still a 2nd order system so overshooting is expected. While it's possible servos have feed-forward and predictive algorithms to prevent excessive overshooting i doubt it based on watching servos move.
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