NORDAC BASE (SK 180E / SK 190E) – Users Manual for Frequency Inverters
108
BU 0180 en-4118
P241
[-01]
[-02]
Inductivity PMSM
(Inductivity PMSM)
S
P
0.1 ... 200.0 mH
{ all 20.0 }
The typical asymmetric reluctances of the PMSM are compensated with this parameter. The stator
inductances can be measured by the frequency inverter (P220)
[-01] = d axis (L
d
)
[-02] = q axis (L
q
)
P243
Reluct. angle IPMSM
(Reluctance angle IPMSM)
S
P
0 … 30 °
{ 0 }
In addition to the synchronous torque, synchronous motors with embedded magnets also have a
reluctance torque. The reason for this is due to the anisotropy (inequality) between the inductivity in
the d and the q direction. Due to the superimposition of these two torque components, the optimum
efficiency is not at a load angle of 90°, as with SPMSMs, but rather with larger values. This
additional angle, which can be assumed as 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
) t
o run in CFC mode (P300 ≥ 1)
•
Gradually increase the reluctance angle (P243) until the current (P719) reaches a minimum
P244
Peak current PMSM
(Peak current PMSM)
S
P
0.1 … 100.0 A
{ 5.0 }
This parameter contains the peak current of a synchronous motor. The value must be obtained
from the motor data sheet.
P245
Osc damping .PMSM VFC
(Oscillation damping PMSM VFC)
S
P
5 … 100 %
{ 25 }
In VFC open-loop mode, PMSM motors tend to oscillate due to insufficient intrinsic damping. With
the aid of "oscillation damping" this tendency to oscillate is counteracted by electrical damping.
P247
Switch freq.VFC PMSM
(Switchover frequency VFC PMSM)
S
P
1 ... 100 %
{ 25 }
In order to provide a minimum amount of torque
immediately in case of spontaneous load changes, in VFC
mode the setpoint of I
d
(magnetisation 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 governed by
(P247). In this case, 100 % corresponds to the rated motor
frequency from (P201).
Summary of Contents for SK 180E Series
Page 1: ...BU 0180 en NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters...
Page 4: ...NORDAC BASE SK 180E SK 190E Users Manual for Frequency Inverters 4 BU 0180 en 4118...
Page 185: ...8 Additional information BU 0180 en 4118 185 8 3 4 EU Declaration of Conformity...
Page 211: ...Key word index BU 0180 en 4118 211...
Page 212: ...6071802 4118...
