System Manual – MOVIDRIVE® compact Drive Inverters
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Motor Selection for Synchronous Servomotors (SERVO)
Project Planning
4.6
Motor Selection for Synchronous Servomotors (SERVO)
Motor
characteristics
The demands made on a servo drive include speed dynamics, stable speed and posi-
tioning accuracy. CM/DS motors with MOVIDRIVE
®
meet these requirements.
Technically speaking, these are synchronous motors with permanent magnets on the
rotor and a mounted resolver. The required characteristics, namely constant torque over
a wide speed range (up to 5500 1/min), a high speed and control range (up to 1:3000)
and a high overload capacity (more than 3
×
M
0
), are achieved using control by
MOVIDRIVE
®
. The mass moment of inertia of the servomotor is lower than that of the
asynchronous motor. This means it is ideally suited to applications requiring dynamic
speeds.
M
0
and M
max
are determined by the motor. The attainable M
max
can also be less,
depending on the inverter.
Refer to the DS/CM motor tables for the values for M
0
.
Refer to the DS/CM motor selection tables for the values for 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!
We recommend always using the latest version of MOVITOOLS
®
for startup. The latest
MOVITOOLS
®
version can be downloaded from our homepage (www.sew-euro-
drive.de).
01652CEN
Figure 61: Speed/torque characteristic curve of the CM/DS servomotor
1 Continuous torque
2 Maximum torque
0
M
max
0
1
2
M
0
M [lb.in]
n [rpm]
n
N
Summary of Contents for MOVIDRIVE compact MCH41A
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