DC−bus operation
Basic dimensioning
Motor efficiency
7
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EDS94SPP101 EN 10.2
7.5.3 Motor efficiency
For determining the power requirements, you have to consider the shaft power P
shaft
and
the motor efficiency. The motor efficiency can be found under the motor data.
7.5.4 Power loss of devices
When determining the power requirements, the power loss of the devices must be
considered ( Tab. 7−6).
7.5.5 Determining the power requirements
For determining the power requirements of the drive system you need to know the rated
power of the motors and their efficiency as well as the power losses of the controllers. The
power requirements are calculated with the following formula:
P
DCtotal
Total power required by the drive system
P
shaft
Rated power of a connected motor
P
loss
Power loss of a controller
Motor efficiency
I Index variable for device identification
n Number of devices in the drive system
The supplying device must be able to supply the calculated power requirements.
For application examples, please see 7.7 .
7.5.6 Determining the regenerative power requirements
With the regenerative power supply modules of the "Servo Drives 9400" series, power
regeneration into the AC mains is possible. Use the determined regenerative power for the
dimensioning of the regenerative power supply module.
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