194
System Manual – MOVIDRIVE® compact Drive Inverters
4
Motor selection for asynchronous servomotors (CFC)
Project Planning
4.5
Motor selection for asynchronous servomotors (CFC)
Basic recommen-
dations
Observe the following recommendations for selecting the motor:
•
Only use motors with at least thermal class F.
•
Use TF thermistors or TH winding thermostats.
Motor character-
istics
Drives in CFC operating modes are characterized by their ability to control torque direct-
ly and quickly. This means they achieve a highly dynamic overload capacity (up to
3
×
M
N
) and a very high speed and control range (up to 1:5000). Stable speed and
positioning accuracy meet the high requirements of servo technology. These character-
istics are made possible through field-oriented control. The current components for
magnetization (I
d
) and torque generation (I
q
) are controlled separately. A prerequisite for
the CFC operating modes is that the motor must always be equipped with an encoder.
The inverter needs to know exact data about the connected motor to calculate the motor
model. This data is made available by the MOVITOOLS
®
operating software with the
startup function. CFC operating modes are only possible with 4-pole SEW-motors
(CT/CV or DT/DV), not with other SEW motors or non-SEW motors. For 4-pole SEW
motors, the motor data required for the CFC operating modes is stored in MOVIDRIVE
®
.
Typical
speed/torque
characteristic
curve
M
N
is determined by the motor. M
max
and n
trans
depend on the motor/inverter combina-
tion. Refer to the motor selection tables for the CFC mode for the values of n
trans
, M
N
and M
max
.
NOTE
The torque limit (M limit) is set automatically by the startup function of the
MOVITOOLS
®
operating software. Do not increase this automatically set value!
SEW-EURODRIVE recommends always using the latest version of MOVITOOLS
®
for
startup. The latest MOVITOOLS
®
version can be downloaded from our homepage
(www.sew-eurodrive.com).
01651BEN
Figure 60: Speed/torque characteristic curve in CFC operating mode
1 With self-cooling
2 With forced cooling
3 Maximum torque
0
M
max
0
2
1
3
n
M
n
trans
M
N
1.4 n
×
trans
Summary of Contents for MOVIDRIVE compact MCH41A
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