Losses And Efficiency Of A Power Drive System - Danfoss VLT DriveMotor FCP 106 Design Manual

System Integration
Switching frequency
The switching frequency influences magnetization losses in
the motor and switching losses in the frequency converter,
as shown in Illustration 3.18.
25
3 3
20
15
10
5
3
0
0
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.
46
VLT
1
2
2 4 6 8
[kHz]
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®
DriveMotor FCP 106/FCM 106
10
MG03M202