10
Project planning
Recommendations for motor and inverter selection
Operating Instructions – MOVIMOT
®
flexible
340
10.5.5
Asynchronous motors in control mode CFC
Either standard asynchronous motors (e.g. DRN.. motors) or asynchronous servomo-
tors (e.g. DRL.. motors) can be used in control mode CFC. SEW‑EURODRIVE recom-
mends using asynchronous servomotors to achieve optimum benefit from the advant-
ages of the control mode CFC.
Standard asynchronous motors in control mode CFC
In comparison to control mode VFC
PLUS
, higher dynamic properties can be achieved
using CFC. The full motor magnetization is maintained in each operating state, so that
the highest requirements for dynamics are met. Due to the voltage reserves required
for this, standard asynchronous motors are operated with a lower base speed in this
operating mode than in operating mode VFC
PLUS
. Power yield and energy efficiency
are thus lower.
Speed/torque characteristic for VFC
PLUS
and CFC in comparison.
0
VFC
CFC
n
N
n
2 x n
N
[3]
[2]
[1]
19531895051
[1]
Torque
[2]
Current
[3]
Power rating
29128668/EN – 12/2019
