Configuring
2.3 Selecting and dimensioning induction motors
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
30
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
A differentiation should be made depending on the period T and the thermal time constant
T
th
of the motor that is dependent on the shaft height:
●
T/T
th
≤ 0.1 (for a cycle duration of 2 to 4 min)
●
0.1 ≤ T/T
th
≤ 0.1 (for a cycle duration of 3 to 20 min)
●
T/T
th
> 0.5 (for a cycle duration of approx. 15 min)
Motor selection
Table 2-1
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:
0
UPV
0!
1
ຘ
7
WK
7
DQG0
PD[F\FOH
0
1
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
●
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
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
).
