Glossary
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 smaller.
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
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Created on ... October 02, 2007
