Table of Contents
Advertisement
5.1.7
Uneven current load
If the current load of the three phases is continuously uneven, the motor must only be
operated at no more than 70 % of its rated torque, see also M
and characteristics".
For precise dimensioning, please contact your local Siemens office.
Note
Not all of the three phases are necessarily evenly loaded in all motor operating modes.
Examples of uneven current load:
• Motor is at a standstill with current being fed to it, e.g. for:
– Compensation of a weight force
– Start-up against a brake system (damping and impact absorption elements)
• Low speeds over a longer period (n << 1 rpm)
• Very low oscillating rotary motion (distance along the circumference of the rotor segment
< pole width)
5.1.8
Motor torque-speed diagram
Checking the torques and speeds
At high speeds, the maximum available motor torque is limited by the available DC link
voltage. If the speeds that occur in the motional sequence are greater than the maximum
speed n
check the torques and speeds using the motor torque-speed diagram. This diagram is
included with the motor specifications.
Figure 5-5
1FW68 radial segment motors
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1
specified for the motor type at the maximum torque M
MAX,MMAX
Motor torque-speed diagram
Configuring
5.1 Configuring workflow
* in Chapter "Technical data
0
, you may have to
MAX
87
Advertisement
Table of Contents
