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Calculating and determining points P1, P2, P3 and P4
P1
P2
P3
P4
P4 is the point of intersection of M
obtained by connecting P2 and P4.
Enter and connect points P2 and P4.
This line is the new voltage limiting characteristic for V
❒
Typical M/I characteristic
Because of saturation effects, the achievable torque cannot be calculated linearly from the
current (particularly at high currents).
1
2
Figure 6-5
From M
current using the following formulas:
k
(I) =
T
k
(I) = (
T
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
n
= 380 V • 1000 / 87 • 0.95
1
n
= 4597 rpm • 290 V / 380 V
2
M
n
at
= 3000 rpm and
limit
N
M
= ((290 V - 261 V) / (380 V -
limit new
261 V)) • 8.8 Nm
Best case
Worst case
Torque-current characteristic curve for self-cooled motors
(or I
), you can calculate the torque or the torque constant as a function of the
0
0
M
I
/
M
I
I
I
I
/
) + ((
-
) / (
0
0
0
max
Technical data and characteristic curves
V
M
= 380 V read:
Mot
and n
. The new voltage limiting characteristic is
Limit, new
N
I
M
I
M
-
)) • ((
/
) - (
0
max
max
n
= 4597 rpm
1
n
= 3508 rpm
2
= approx. 8.8 Nm
limit
M
= 2.14 Nm
limit new
= 290 V.
Mot, new
k
Torque constant
M
Torque
/ Nm
I
Current
/ A
I
M
/
)) Static torque
/ Nm
0
0
0
I
Stall current
/ A
0
Maximum torque
Maximum current
6.1 Explanations
(I) / Nm/A
T
M
/ Nm
max
I
/ A
max
139
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