Regulation

The ability of a control system to hold a speed
once it has been set. Regulation is given in
percentages of either base speed or set speed.
Regulation is rated upon two separate sets of
conditions:
A. Load Regulation (speed regulating) is the
percentage of speed change with a defined
change in load, assuming all other
parameters to be constant. Speed regulation
values of 2% are possible in drives utilizing
armature voltage feedback, while regulation
of 0.01% is possible using digital regulator
schemes.
B. Line Regulation is the percentage of speed
change with a given line voltage change,
assuming all other parameters to be
constant.