5 Parameters
BU 0505 EN-3021 109
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
)
Pos: 173 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P200- P299/Parameter P243 – Rel uktanzwinkel IPMSM @ 6\mod_1 417603844346_388. docx @ 191712 @ @ 1
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 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
) to run in CFC mode (P300 ≥ 1)
• Gradually increase the reluctance angle (P243) until the current (P719) reaches a minimum
Pos: 174 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P200- P299/Parameter P244 – S pitzen stro m PMSM @ 0\mod_13 27591035576_388.d ocx @ 8416 @ @ 1
P244 Peak current PMSM
(Peak current PMSM)
S P
0.1 … 100.0 A
{ 20.0 }
This parameter contains the peak current of a synchronous motor. The value must be obtained
from the motor data sheet.
Pos: 175 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P200- P299/Parameter P245 – Pende ldämpfung PMSM VFC @ 6\mod_14 17605252683_388.doc x @ 191743 @ @ 1
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.
Pos: 176 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P200- P299/Parameter P246 – Massenträgheit PMSM @ 0\mod_1327591081936_388.doc x @ 8439 @ @ 1
P246 Mass inertia PMSM
(Mass inertia PMSM)
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 portion of the
external centrifugal mass (gear unit, machine) must be calculated or determined experimentally.
Pos: 177 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ Parameterauflis tung (P000 ...)/P200- P299/Parameter P247 – Umsc haltfrequenz VFC PMSM @ 6\mod_1 417606764814_388. docx @ 191774 @ @ 1
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).
Pos: 178 /Anleitungen/ Elektronik/F U und Starter/5. Parameter/ P3xx Regelungspara meter [SK 5xxE] @ 0\mod_13275911 32858_388.doc x @ 8462 @ 5 @ 1
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