Siemens SIMOTICS S-1FK2 Configuration Manual

5.2.3 De󹪝ne the load case, calculate the maximum load torque and determine the
motor
The motors are de󹪝ned bases on the motor type-speci󹪝c limiting characteristic curves.
The limiting characteristic curves describe the torque or power curve over the speed.
The limiting characteristic curves take the limits of the motor into account on the basis of the DC-
link voltage. The DC-link voltage is dependent on the line voltage.
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M_max Curve of the maximum torque
S1 S1 characteristic
Figure 5-1 Limit characteristics for synchronous motors
Procedure
1. Determine the load which is speci󹪝ed by the application.
Use di󹪜erent characteristics for the di󹪜erent loads.
The following operating scenarios have been de󹪝ned:
– Duty cycle with constant ON duration
– Free duty cycle
2. Determine the characteristic torque and speed operating points of the motor for the de󹪝ned
load.
3. Calculate the acceleration torque of the motor.
Add the load torque and the acceleration torque. to obtain the maximum required torque.
4. Verify the maximum motor torque with the limiting characteristic curves of the motors.
The following criteria must be taken into account when selecting the motor:
– Compliance with the dynamic limits
All torque-speed points of the load must be below the relevant limiting characteristic
curve.
– Compliance with the thermal limits
At average speed, the e󹪜ective motor torque must be below the S1 characteristic
(continuous operation) during the load.
You have speci󹪝ed a motor.
Con󹪝guration
5.2 Con󹪝guring procedure
1FK2 Synchronous Motors for SINAMICS S120
68 Con󹪝guration Manual, 02/2022, A5E46927724B AD

Siemens SIMOTICS S-1FK2 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FK2
Category	Engine
Language	English