Appendix
10/05 AWB8230-1541GB
214
Sine-wave filter
Block Transformatoren-Elektronik GmbH & Co. KG
Postfach 1170
Max-Planck-Strasse 36–46
27261 Verden
Tel.: +49 (0)4231 6780
Fax: +49 (0)4231 678177
E-mail: info@block-trafo.de
Internet: www.block-trafo.de
Sine-wave filter SFB filters out high-frequency components above
the set resonance frequency from the frequency inverter output
voltage (a figure 189). The sine-wave filter’s output voltage
(a figure 190) has a sine-wave shape with a low overlaid ripple
voltage. The sine-wave voltage’s total harmonic distortion is
typically 5 to 10 %. This significantly reduces the noise generated
by the motor and extends its lifespan to that of a mains-operated
motor.
Advantages of the sine-wave filter:
• Long screened motor supply cables possible.
• Extended lifespan of the motor.
• Low noise generation.
Figure 188:Sine-wave filter SFB 400/...
Figure 189:High frequency components of the output voltage
a Without sine-wave filter
b With sine-wave filter
f: Rotating field frequency
n: Harmonics ordinal
Figure 190:Output voltage to motor
U
2
: Inverter output voltage
U~:Sinusoidal voltage to be simulated
a
b
n
f
05 10 15 20 25 30 35 40 45
200 V/div 1 ms/div
Uh
U
2
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