37
No smoothing reactor
Without smoothing reactor, current at point of transition from discontinuous to continuous
current, i.e. current maximum values just touch the zero line; point of transition from
discontinuous to continuous current (example half motor nominal speed) is 31 % of I
N
.
No figure, as above, 1.5 mH smoothing reactor, transition from discontinuous to continuous
current is 12 % I
N
.
Discontinous current, half rated motor speed, without smoothing reactor
U-Last (Motor)
-300
-200
-100
0
100
200
300
400
0
2
4
6
8
10
Zeit in [ms]
U
i
n
[
V
]
Laststrom
0
100
200
300
400
500
600
0
2
4
6
8
10
Zeit in [ms]
Id
c
in
[
A
]
U-Last (Motor)
-200
-100
0
100
200
300
400
500
0
2
4
6
8
10
Zeit in [ms]
U
in
[
V
]
Laststrom
-50
0
50
100
150
200
250
0
2
4
6
8
10
Zeit in [ms]
Id
c
in
[
A
]
U-Last (Motor)
-50
0
50
100
150
200
250
300
350
400
0
2
4
6
8
10
Zeit in [ms]
U
in
[
V
]
Laststrom
-10
0
10
20
30
40
50
60
70
80
90
0
2
4
6
8
10
Zeit in [ms]
Id
c
i
n
[
A
]
: Period of discontinuous current
the motor voltage is the motor EMF, here 200 V
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Time in [ms]
Load current
Load current
Load current
Motor armature voltage
Motor armature voltage
Motor armature voltage
