
6
Operating modes and limit values
Special application
Operating Instructions – EDR..71 – 315, EDRN63 – 315
121
6.7.2
Calculating the field weakening f
D*
The following diagram illustrates the S1 limit characteristics of the EDRE90L4 of cat-
egory 2.
0
5
10
15
0
10
20
30
40
50
60
70
80
90
100
Nm
Hz
A
B
C
D*
D
E
E*
18014403598380299
Field weakening
The field weakening is calculated using the following formula:
f
U
U
f
D
Motor terminal voltage
Nominal motor voltage
D
*
=
×
f
D
Beginning of field weakening (ideal case, motor terminal voltage = nominal motor
voltage)
f
D*
Beginning of field weakening (depending on the actual motor terminal voltage)
25896334/EN – 06/2019
Содержание EDR200
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