Uneven Current Load; Motor Torque-Speed Diagram - Siemens SIMOTICS T-1FW6 Configuration Manual

6.2.5

Uneven current load

If the current load of the three phases is continuously uneven, the motor must only be operated
at no more than approx. 70 % of its rated torque. See also M
characteristics".
For precise dimensioning, please contact your local sales partner.
Note
Uneven current load
Not all of the three phases are necessarily evenly loaded in all motor operating modes!
Examples of uneven current load:
• Standstill with current fed to the motor, 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 of time (n << 1 r/min)
• Very small rotary oscillating movements (path on rotor circumference < pole width)
6.2.6

Motor torque-speed diagram

Checking torques and speeds
At high speeds, the maximum available motor torque is limited by the available DC link voltage.
The speeds occurring in the motion sequence can exceed the maximum speed n
specified for the motor type at the maximum torque M
made based on the motor torque-speed diagram. This diagram is included with the motor
specifications.
Figure 6-5
1FW6 Built-in torque motors
Configuration Manual, 09/2022, A5E52220645B AA
Motor torque-speed diagram
6.2 Configuring workflow
* in Chapter "Technical data and
0
. In this case, a check must be
MAX
Configuration
MAX,MMAX
103