Switching frequency
The switching frequency influences magnetization losses in
the motor and switching losses in the frequency converter,
as shown in
.
130B
E107
.10
25
20
15
10
5
0
0
2
4
6
8
10
[kHz]
[%]
1
2
3
1
Motor and frequency converter
2
Motor only
3
Frequency converter only
Illustration 3.18 Losses [%] versus Switching Frequency [kHz]
NOTICE
A frequency converter produces extra harmonic losses in
the motor. These losses decrease when switching
frequency increases.
3.7.4 Losses and Efficiency of a Power Drive
System
To estimate the power losses at different operating points
for a power drive system, sum the power losses at the
operating point for each system component:
•
Frequency converter.
•
Motor.
•
Auxiliary equipment.
System Integration
VLT
®
DriveMotor FCP 106/FCM 106
46
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MG03M202
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