2 Engineering
2.5 Motor and Application
44 DC1 Frequency Inverter 10/12 MN04020003Z-EN www.eaton.com
The output voltage of the sinusoidal filter (U~) achieves a sinusoidal shape
with a slight superimposed ripple voltage.
The THD factor of the sinusoidal voltage is normally 5 to
10 %.
Figure 19: Output voltage to motor
U
2
: Frequency inverter output voltage
U~: Sinusoidal voltage to be simulated
Advantages of sinusoidal filters:
• Long motor cable lengths with reduced conducted and radiated interfer-
ence
• Reduced motor losses and noise
• Longer motor lifespan
Disadvantages of sinusoidal filters:
• Voltage drop of up to 9 % caused by system
(approx. 36 V if U
2
= 400 V)
• higher heat dissipation,
• A fixed pulse frequency is required
• Require more space inside the control panel
NOTICE
Sinusoidal filters must only be used with permanently set pulse
frequencies.
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