AFF            Acceleration-feed-forward.  A percentage of the commanded acceleration is  fed directly to the output. Application-specific servo controller     A device  such as the National Semiconductor LM628 or 629 that is designed to execute a single trapezoidal trajectory motion with PID error filtering. D-term       Proportion of output based on  the rate of change of error.  Acts in opposition to the P and I terms. Following error    The difference between the actual  position during motion and the ideal position. High precision    Generally defined as having an accuracy of  1 micron or less. I-term         Proportion of  output based on the summation of errors.  Adds to the P term output. P-term        Proportion of output based on the instantaneous error.  Adds with the I term output. VFF             Velocity-feed-forward.  A percentage of the commanded velocity is fed  directly to the output. Motion Control   Motor selection   Position sensors   Gearheads    Controller    Accuracy and resolution Stage selection

Send mail to honcho@TheMotionStore.com with questions or comments about this web site.    Last modified: 7th August 2007