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4-4
Technical Data
(1) Key speed
(2) Rated speed
(3) Maximum speed
Characteristic Curve
P:
mechanical output in kilowatts [kW]
M:
torque available on the output shaft, in Newton meters [Nm]
n:
motor speed, in revolutions per minute [min
(1):
key speed (n
1
(2):
rated speed (n
(3):
max. torque (n
(4):
characteristic curve without de-rating
(5):
characteristic curve with de-rating
Fig. 4-4:
IndraDyn A sample characteristic curves
Note:
The achievable torque depends on the drive controller used.
The reference value for the characteristic curves of the motor
is an unregulated intermediate circuit voltage of 540V
Explanation:
Start of a drop in speed and power before reaching the rated speed n
This behavior is called de-rating and occurs only with some versions of
motor windings. Without de-rating, the key speed equals the rated speed.
Until the key speed is reached, continuous current at standstill I
(root-mean-square value). With no de-rating, the continuous current
at standstill equals the rated current I
Until the key speed is reached, continuous torque at standstill M
available for S1 operation. Without de-rating, the continuous torque at
standstill equals rated torque M
With an effective de-rating, torque is reduced when the key speed is
reached. Fig. 4-4 shows to characteristics curves starting at the key
speed.
Without de-rating effect, induction motors provide a constant torque up to
the rated speed (rated torque); starting at the rated speed, constant rated
power P
is available.
N
The speed limit up to which a motor can be safely operated. This is
usually limited by the mechanical construction (bearing) or by using a
holding brake.
in data sheet)
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N
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max
.
N
.
N
DOK-MOTOR*-MAD/MAF****-PR03-EN-P
Rexroth IndraDyn A
AsyncCurve.EPS
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.
DC
.
N
applies
1
is
1
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