SEW-Eurodrive MOVIDRIVE compact MCH41A, System Manual

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System Manual – MOVIDRIVE® compact Drive Inverters
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Motor selection for asynchronous servomotors (CFC)
Project Planning
Asynchronous
servomotors
CT/CV SEW-EURODRIVE offers CT/CV asynchronous servomotors specifically for operation
with MOVIDRIVE
®
in the CFC operating modes. These motors have the following
characteristics:
High power yield
The optimum winding of CT/CV motors permits a high power yield.
Division into speed
classes CT/CV motors are available in four speed classes. This division ensures optimum utili-
zation of torque and speed.
Sin/cos encoder as
standard
CT/CV motors are equipped as standard with a high-resolution sin/cos encoder (ES1S,
ES2S, EV1S).
TF or TH motor
protection as
standard The winding temperature of the three motor phases is monitored using thermistors (TF).
The thermistor can be connected to the TF/TH input of MOVIDRIVE
®
. The temperature
is then monitored by MOVIDRIVE
®
; no additional monitoring unit is required.
Bimetallic switches (TH) can also be used instead of thermistors. The bimetallic switch-
es are also connected to the TF/TH input.
Thermal classifica-
tion F as standard
CT/CV motors are designed with thermal classification F materials.
Reinforced pinion
shaft ends CT/CV motors can generate up to three times their rated motor torque in dynamic
operation. For this reason, these motors are equipped with reinforced pinion shaft ends
for direct mounting to gear units to enable them to transmit the high torque levels
reliably.
Either DT/DV/ motors or CT/CV motors can be used in CFC mode. SEW-EURODRIVE
recommends using CT/CV motors to achieve optimum benefit from the CFC mode.
Advantage Disadvantage
CFC mode with DT/DV motor
Motor selection
→
page 207
Standard motor version
Lower transition speed than the
CT/CV motor.
The power yield of the motor is
less than the rated motor power.
In terms of the power yield, the
mass inertia is greater than that of
the CT/CV motors.
The maximum torque is limited for
some of the inverter/motor combi-
nations due to mechanical rigidity.
CFC mode with CT/CV motor
Motor selection
→
page 199
Higher transition speed
than DT/DV motor.
No IEC standard motor
Usually with a power yield one
motor type higher.
Based on the power yield of a
lower mass moment of inertia.
Higher current demand due to
higher power yield; therefore a
larger inverter has to be
assigned.
Motor is designed for dynamic
operation.