Siemens SIMOTICS S-1FT7 User Manual

Technical data and characteristic curves
6.1 Explanations
S-1FT7 synchronous motors
136 Configuration Manual, 09/2018, A5E45099423B AA
①
Voltage limiting characteristic curve = torque limit without field weakening, e.g. with winding
types C, F, H, K
Figure 6-3 Speed-torque diagram
Note
The voltage limit characteristic of a motor with 6000 rpm rated
speed is far above that of the
same motor type with 2000
rpm. The motor with the rated speed 6000 rpm requires a much
higher current for the same torque.
Therefore select a rated speed for the requirement that is slightly higher than the required
maximum s
peed.
In this way, the size of the converter module (output current) can be minimized.
Shift of the voltage limiting characteristic (only relevant when field weakening is deactivated)
The voltage limiting characteristic can only be shifted:
● For approximately linear limiting characteristics
● For
U
Mot new
> U
IN
Determining the induced voltage U
IN
You can read-off the induced voltage U
IN
from the motor rating plate - or you can calculate it
using the following formula.
U
IN
= k
E
∙ n
N
/ 1000
Rated speed n
N
/ rpm
Voltage constant k
E
/ V/1000 rpm
U
IN
/ V

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English