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VFD Outputs

R

Rob Hammond

Jan 1, 1970
0
Hi all

Are there any VFDs that provide a near-pure sine wave output that could
be used as a source for other electrical equipment?
Alternatively, provided the output of a 3ph variable frequency drive is
maintained at 50-60Hz is it permissible to connect a transformer to one
of the output phases to provide a 'smoothed' secondary output voltage?

Regards
Rob Hammond
 
A

albown

Jan 1, 1970
0
Rob Hammond said:
Hi all

Are there any VFDs that provide a near-pure sine wave output that could
be used as a source for other electrical equipment?
Alternatively, provided the output of a 3ph variable frequency drive is
maintained at 50-60Hz is it permissible to connect a transformer to one
of the output phases to provide a 'smoothed' secondary output voltage?

Regards
Rob Hammond


VFD's as far as I know are basically pulsed DC to look like a sine wave for
the motor. Most today are PWM, pulse width modulation. Some companies call
it another name.

If the drive is at a set speed, i.e. 60 hz then there should not be much
more variance in the voltages than the utility feed.

Seems to me your trying to make something more complicated than it needs to
be. Remember if your using the output to two sources, i.e. motor and then
your transformer. The VFD will have to be sized for the job. I have seen
one 40 hp drive running 2 10 hp motors. I doubt that you will be able to
connect a single phased transformer with out frying the drive sooner than
usual.

Just my opinion.
 
C

C What I Mean

Jan 1, 1970
0
Connecting a single phase transformer will show the drive a load imbalance
and it will most likely fault out. Those drives assume a motor load that
should be balanced within a certain %.
 
E

Elettronica

Jan 1, 1970
0
You have to look at Frequency inverter with all pole sine filter integrated.
Much expensive, large and heavy but sine wave output.
Regards.
Ale
 
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