Lenze SX-1 - Page 80

7.1.2
During acceleration, the distanCe inCreases quadratically with time:
s (t) = 1/2 • a •
For the Gain Factor we have:
Vref ____
KV= ds L~J
And because of the units used, we have:
KV= 2a • 16Ä ~-
For rotary movements, the angular velocity is proportional to r. p. m., i. e.:
KV-1/n
In diagrammatiC form:
For a drive system with constant aCceleration at all speeds, optimally KV would vary in
inverse proportion to speed. However, this algorithm would take muCh time to calculate,
and the acCuracy, stability and stiffness would not be greatly improved over the SX-1
algorithm, which selects one of three different KV values, according to speed.
7/14
1‘
—~ n
KV
T
n
Lanze