4
01.99
4.8
Permanent–magnet synchronous motor with field–weakening (PE spindle)
4-164
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
Table 4-9
Parameter overview for PE spindles, continued
Parameters
No.
Effective
Units
Max.
Standard
Min.
Name
1142
Speed at the start of field weakening
(SRM, ARM)
0.0
0.0
100 000.0
RPM
Immedi-
ately
The speed at the start of field weakening is assigned when selecting the motor from the motor
list, or according to the motor manufacturer’s data sheet.
If the motor manufacturer has no data, then the speed at the start of field weakening can be
calculated according to the following formula:
P1142 = 380 V
1000 [RPM] / P1114
Note:
P1114
Voltage constant
n
P1142: Speed at the start of field weakening
I
d
P1136:
Motor locked–rotor current
I
d
:
Field–generating current
1145
Stall (standstill) torque reduction factor
5.0
100.0
1000.0
%
Immedi-
ately
1149
Reluctance torque constant (SRM)
0.0
0.0
300.0
mH
Immedi-
ately
For synchronous motors that have rotors that are not symmetrical around the rotational axis,
the additional reluctance torque can be used to increase the torque.
The reluctance torque constant multiplied by the torque and field–generating current provides
the torque increased as a result of the reluctance torque.
Note:
Refer to P1128 (optimum load angle)
Synchronous motors that have rotors that are not symmetrical around the rotational axis: e.g.
1FE motors
Operation with reluctance torque: P1128 and P1149 not equal to the standard value
Operation without reluctance torque: P1128 and P1149 equal to the standard value
4 Commissioning
08.01