Siemens SINAMICS S 1PH7 - Motor Selection; Selection of Motor Modules; A High Field Weakening Range Is Required

Configuration
2.3 Selecting and dimensioning induction motors
1PH7 induction motors (Machine tools)
46 Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
Motor selection
Table 2- 3 The motor is selected depending on the cycle duration and the thermal time constant
Cycle duration Motor selection
T/T
th
≤ 0.1 (cycle duration of 2 to 4 min) A motor with the following rated torque M
N
should be
selected:
M
N
> M
rms
and M
max (cycle)
< 2 M
N
0.1 ≤ T/T
th
≤ 0.5 (cycle duration of approx. 3 to approx.
20 min)
A motor with the following rated torque M
N
should be
selected:
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T/T
th
> 0.5 (for a cycle duration of approx. 15 min) If, for duty cycles, torques occur above M
N
for longer than
0.5 T
th
, then a motor with the following rated torque should
be selected: M
N
> M
max (cycle)
.
Selection of Motor Modules
The required currents for overload are specified in the power-speed characteristics (powers
for S6-25 %, S6-40 %, S6-60 %). Intermediate values can be interpolated.
2.3.6 A high field weakening range is required
Proceed as follows for applications with a field-weakening range greater than for standard
induction motors:
Starting from the max. speed n
max
and the power P
max
required at maximum speed, a motor
must be selected which provides the required power P
max
at this operating point (n
max
, P
max
).
Finally, a check should be made as to whether the motor can generate the torque or the
power at the transition speed required by the application (n
N
, P
N
).