Engineering Guide CDA3000
1-13
1 Analysis of task
DE
EN
1
2
3
4
5
6
7
A
1.3.3 Manipulating
range and
accuracy
The desired torque rise time, the speed manipulating range and the posi-
tioning accuracy are likewise determined by the technological processing
process.
In the following some terms are defined more closely, in order to avoid
misunderstandings between you - the customer - and the drive manu-
facturer.
Definition of terms
Torque rise time
The torque rise time is the time which elapses after a reference step from
0 to MN until the actual value of the torque in the motor has reached 95%
of the nominal value.
The torque rise time is dependent on the control methods applied and on
the electrical parameters of the motor used. As the speed increases the
voltage reserve for injection of a current falls, causing the torque rise time
to increase.
T
A
= Torque rise time
(1) Reference
(2) Actual
Figure 1.11 Torque rise time
TA
M(t)
t
95 %
(1)
(2)
100%
