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Configuring
2.3 Selecting and dimensioning induction motors
A differentiation should be made depending on the period T and the thermal time constant
T
th
● T/T
● 0.1 ≤ T/T
● T/T
Motor selection
Table 2-1
The motor is selected depending on the cycle duration and the thermal time constant
Cycle duration
T/T
≤ 0.1 (cycle duration of 2 to 4 min)
th
0.1 ≤ T/T
≤ 0.5 (cycle duration of approx. 3 to approx. 20
th
min)
T/T
> 0.5 (for a cycle duration of approx. 15 min)
th
Selection
● for SINAMICS Motor Module
● for SIMODRIVE power unit
● for SIMOVERT MASTERDRIVES converter/inverter
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
must be selected which provides the required power P
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
30
of the motor that is dependent on the shaft height:
≤ 0.1 (for a cycle duration of 2 to 4 min)
th
≤ 0.1 (for a cycle duration of 3 to 20 min)
th
> 0.5 (for a cycle duration of approx. 15 min)
th
Motor selection
A motor with the following rated torque M
selected:
M
> M
and M
N
rms
A motor with the following rated torque M
selected:
If, for duty cycles, torques occur above M
0.5 T
, then a motor with the following rated torque should
th
be selected: M
N
and the power P
max
max
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
N
< 2 M
max (cycle)
N
N
N
> M
.
max (cycle)
required at maximum speed, a motor
at this operating point (n
max
, P
).
N
N
should be
should be
for longer than
, P
).
max
max
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