NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
156
BU 0200 en-US-4920
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P241
[-01]
[-02]
Inductivity PMSM
(PMSM inductance)
S
P
0.1 ... 200.0 mH
{ all 20.0 }
The typical asymmetric reluctances of the PMSM are compensated with this parameter. Stator
inductances can be measured by the variable frequency drive (P220).
[-01] = d axis (L
d
)
[-02] = q axis (L
q
)
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P243
Reluct. angle Reluct. angle IPMSM
(IPMSM reluctance angle)
S
P
0 … 30°
{ 0 }
Synchronous motors with embedded magnets also have a reluctance torque in addition to
synchronous torque. The reason for this is found in the anisotropy (inequality) between inductance
in the d and the q direction. Due to the superimposition of these two torque components, maximum
efficiency is not at a load angle of 90°, as with SPMSMs, but rather with larger values. This
additional angle, which can be assumed to be 10° for NORD motors, can be taken into account with
this parameter. The smaller the angle, the smaller the reluctance component.
The specific reluctance angle for the motor can be determined as follows:
•
Allow drives with constant load (> 0.5 M
N
) to run in CFC mode (P300 ≥ 1)
•
Gradually increase the reluctance angle (P243) until the current (P719) reaches a minimum
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P244
Peak current PMSM
(PMSM peak current)
S
P
0.1 … 1000.0 A
{ 5.0 }
This parameter contains the peak current of a synchronous motor. The value must be obtained
from the motor data sheet.
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P245
Oscillation damping PMSM VFC
(PMSM VFC oscillation damping)
S
P
5 … 250 %
{ 25 }
In VFC open-loop mode, PMSM motors tend to oscillate due to insufficient self-damping. With the
aid of oscillation damping this tendency to oscillate is counteracted by electrical damping.
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P246
Mass inertia PMSM
(PMSM mass inertia)
S
P
0.0 … 1000.0 kg*cm²
{ 5.0 }
The mass inertia of the drive system can be entered in this parameter. For most applications the
default setting is sufficient. However, for highly dynamic systems the actual value should ideally be
entered. The values for the motors can be obtained from the technical data. The proportion of the
external centrifugal mass (gear unit, machine) must be calculated or determined experimentally.
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P247
Switch freq. VFC PMSM
(VFC PMSM changeover frequency)
S
P
1 ... 100 %
{ 25 }
In order to provide a minimum amount of torque
immediately in case of spontaneous load changes,
especially at low frequencies, in VFC mode the setpoint of
I
d
(magnetization current) is controlled depending on the
frequency (field increase mode). The amount of this
additional field current is determined by parameter (P210).
This reduces linearly to the value "zero", which is reached
at the frequency which is determined by (P247). In this
case, 100% corresponds to the rated motor frequency from
(P201).
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