Siemens 611 Torque-speed requirements, Determining the motor torque-speed diagram

Configuring the motor 5.1 Procedure

Determining the motor torque-speed diagram

If a motor torque-speed diagram is not available, the relevant values can be determined with sufficient accuracy using the specifications for the maximum torque MMAX, the rated torque MN, and the associated speeds nMAX,MMAX and nMAX,MN as shown in "Motor torque-speed diagram".

This diagram must be compared with the motor torque-time diagram and the speed-time diagram (see diagram below). To do so, it is normally sufficient to locate the critical points in the torque-time diagram at which the maximum speed nMAX,MMAX is exceeded at the peak torque. For these points, the motor torque (in this example: M1) can be read from the motor torque-time diagram and checked to determine whether it lies below the characteristic in the motor torque-speed diagram.

Figure 5-5 Motor torque-time diagram and associated speed-time diagram

5.1.7Torque-speed requirements

Fulfilling the torque-speed requirements

If the selected torque motor cannot fulfill the torque-speed requirements, the following solutions are available:

●Override:

Provided that no special requirements regarding precision have been specified for the high speed range (e.g. rapid traverse without machining), the maximum speed can be overridden. In this case, the converter output voltages and, in turn, the motor currents are

70	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AD00-0BP7