Nord Drivesystems NORDAC FLEX SK 200E Series User Manual page 154

NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
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P241 Inductivity PMSM
[-01]
[-02]
(PMSM inductance)
0.1 ... 200.0 mH The typical asymmetric reluctances of the PMSM are compensated with this parameter. Stator
inductances can be measured by the variable frequency drive (P220).
{ all 20.0 }
[-01] = d axis (L
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P243 Reluct. angle Reluct. angle IPMSM
(IPMSM reluctance angle)
0 ... 30° 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
{ 0 }
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:
•
•
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P244 Peak current PMSM
(PMSM peak current)
0.1 ... 1000.0 A This parameter contains the peak current of a synchronous motor. The value must be obtained
from the motor data sheet.
{ 5.0 }
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P245 Oscillation damping PMSM VFC
(PMSM VFC oscillation damping)
5 ... 100 % 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.
{ 25 }
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P246 Mass inertia PMSM
(PMSM mass inertia)
0.0 ... 1000.0 kg*cm² 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
{ 5.0 }
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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Switch freq. VFC PMSM
P247
(VFC PMSM changeover frequency)
1 ... 100 % In order to provide a minimum amount of torque
immediately in case of spontaneous load changes,
{ 25 }
especially at low frequencies, in VFC mode the setpoint of
I (magnetization current) is controlled depending on the
d
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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154
)
d
Allow drives with constant load (> 0.5 M
Gradually increase the reluctance angle (P243) until the current (P719) reaches a minimum
[-02] = q axis (L )
q
) to run in CFC mode (P300 ≥ 1)
N
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