Relations Between Various Operating Points Of The Motor; Example 3 Phase Supply - Siemens SINAMICS DCM 6RA80 Faq

Relations between various operating points of the motor:

Example 3 Phase Supply:

Line voltage: 400 V, 50 Hz;
Voltage drop commutating reactor: 4%
Motor: 1GG6208-0NH40-1VV3; 2020 UPM; 183 kW
U : 420 V, I : 466 A, : 91%, Ra: 43.8 m , La: 0.94 mH
N N
Calculation with motor rating data; no smoothing reactor n
resulting current ripple is 11.5 % rms
U-Last (Motor)
Motor armature voltage
600
500
400
300
200
100
0
0 2
Time in [ms]
As above for smoothing reactor 1.5 mH, the resulting current ripple is 4.5 % rms
U-Last (Motor)
Motor armature voltage
500
450
400
350
300
250
200
150
100
50
0
0 2 4
Time in [ms]
Half the rated motor speed, without smoothing reactor, I
U-Last (Motor)
Motor armature voltage
500
400
300
200
100
0
0 2 4
-100
Time in [ms]
degrees; the resulting current ripple is 19% rms
4 6 8 10
Zeit in [ms]
6 8 10
Zeit in [ms]
6 8 10
Zeit in [ms]
voltage at SINAMICS DCM input: 384 V
, I , U
N N
Load current
600
500
400
300
200
100
0
0 2
Time in [ms]
Load current
510
500
490
480
470
460
450
440
0 2
Time in [ms]
,
N
Load current
600
500
400
300
200
100
0
0 2
When motor speed is zero, I
36
= 36 degrees, the
N
Laststrom
4 6 8
Zeit in [ms]
Laststrom
4 6 8
Zeit in [ms]
= 65 degrees
Laststrom
4 6 8
Zeit in [ms]
, = 88
N
10
10
10