Electrical Data
1.1 Definitions
Typical M/I characteristic
The individual characteristics of the 1FT☐ and 1FK☐ motor series have been combined in
"typical shaft height ranges".
The left-hand characteristic of the corresponding shaft height can be considered as "best
case" - the right-hand characteristic as the "worst case".
6KDIWKHLJKWV
,
,
0
.
.
0
Figure 1-6 Typical torque-current characteristic for various shaft heights for naturally-ventilated
motors with the same temperature rise
Torque constant k
T
(value for a 100 K average winding temperature rise)
Quotient of the stall torque and stall current for a 20 °C ambient temperature.
Calculation: k
T
= M
0.100K
/ I
0.100K
The constant applies up to approx. 2 ∙ M
0
(for 60 K and naturally-ventilated motors)
Note
These constants are not applicable when determining the necessary rated and accelerating
currents (motor losses!).
The steady-state load and the frictional torques must also be included in the calculation.
General Section for Synchronous Motors
Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
1-9
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