DIGIVEX Little Drive Servoamplifier
59
PVD 3530 GB 01/2005
Choosing P
The drive is used in a speed loop with purely proportional gain. This gain is the ratio between the
output current and the speed error. It is expressed in mA / rpm.
For the same current I, if the gain increases, the error
ε
is reduced, the rapidity of the system
increases as does its bandwidth.
An increase in gain may lead to instability because of the other components in the loop
(resonances, second order filter).
The use of proportional action P alone has the drawback of giving zero rigidity because there is
no integration ahead of the current section.
This manual was downloaded on www.sdsdrives.com
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