Description, technical data
2.7 Definitions of the electrical data
A5E01083943A AB
30 Siemens AG Operating Instructions 2.02 1FW4
CAUTION
The DC link voltage of the converter must not exceed the maximum value
Correctly parameterize the converter. Limit the field-weakening speed to 120% of the rated
speed. The limited field-weakening range ensures that the DC-link voltage of the converter
does not exceed the maximum permissible value in the case of pulse blocking due to the
induced voltage of the motor.
The voltage limit characteristic of a motor with 600 RPM rated speed lies far above that of
the same motor type with 200 RPM. However, for the same torque, this motor requires a
significantly higher current. This means that it is practical to select a rated speed that does
not lie too far below the maximum speed required for the application. The size (rating) of the
drive converter module (current requirement) can be minimized in this fashion
Rated speed n
N
The rated speed establishes the characteristic speed range for the motor in the speed-torque
diagram. The motors can be operated above the rated speed range. The speed range that is
secured with the characteristic technical data lies between n
N
and a maximum of 1.2 x n
N
.
Stall torque M
0
The static torque M
0
is the thermal limit torque when the motor is static corresponding to the
utilization according to temperature class155. The thermal limit torque can be transferred at
n = 0 for an unlimited amount of time. M
0
is greater than the rated torque M
N
.
Stall current I
0
Motor phase current to generate the particular stall torque.
Rated torque M
N
The rated torque is the thermally permissible continuous torque with S1 operation at the
rated speed of the motor.
Rated current I
N
RMS motor phase current in order to generate the particular rated torque.
Max. current I
max,
This current limit is only determined by the magnetic circuit. Even if this is briefly exceeded, it
can result in irreversible de-magnetization of the magnetic material.
Maximum speed n
max
The maximum permissible speed is n
max
.
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