Siemens SIMOTICS S-1FT7 - Page 142

Technical data and characteristic curves
6.1 Explanations
S-1FT7 synchronous motors
140 Configuration Manual, 09/2018, A5E45099423B AA
Tolerance data
The data shown in the data sheets are nominal values that are subject to natural variation.
The following tolerances apply:
Table 6- 4 Tolerance data in the motor list data
Motor list data
Typ. value
Guaranteed value
Stall current
I
0
± 3 %
± 7.5%
Electrical time constant T
el
± 5 % ± 10 %
Torque constant
k
T
± 3 %
± 7.5%
Voltage constant
k
E
± 3 %
± 7.5%
Winding resistance
R
Str
± 5 %
± 10 %
Moment of inertia
J
mot
± 2 %
± 10 %
Effects of temperature and parameter spread on the characteristic
The torque-speed characteristics specified in the following chapter apply to motors with
nominal/rated values.
For cold motors, characteristic 2 results, and characteristic 3 for motors at operating
temperature, provided that the voltage constant corresponds to the data sheet value.
With field weakening (=characteristic B), much larger torque / speed ranges are possible.
Without field weakening (=characteristic A), the torque / speed range is significantly limited.
Characteristics 1 and 4 result from the theoretically permissible tolerances of the voltage
constant ke of +/- 7.5 %.