Selecting Motors - Siemens SIMOTICS M-1PH1 Equipment Manual

7.3

Selecting motors

Characteristic curves for asynchronous motors
The speed-power diagrams and speed-torque diagrams for operation with the SINAMICS
converter system are described in the motor characteristics. For more information, see
Section "Characteristics (Page 111)".
Depending on the motor variant, the S1 characteristic (continuous operation) is available
from standstill to the rated point with the maximum permissible thermal torque, or passes
through the constant-torque range. The power increases in proportion to the speed
depending on the available torque.
This is then followed by a constant-power range where the field is weakened (field-
weakening range). The field-weakening range is limited by the voltage limit.
For the 1PH1 motors, the S6 characteristics are shown in addition to the S1 characteristic.
The figure below shows the typical speed-power diagram:
In order that safe, reliable operation is guaranteed even when the line supply voltage
fluctuates and the motor parameters vary, a safety margin of at least 10% should always be
maintained to the voltage limit at every operating point depending on the type of supply
voltage of the Motor Module and Line Module.
The 1PH1 motors have a high overload capacity in the constant power range. The theoretical
curve of the maximum permissible overload capacity is shown as a limit in the characteristic
diagrams.
1PH1 main motors
Equipment Manual, 09/2021, A5E51077676A-AA
Configuration
7.3 Selecting motors
87