[MRCG] Variable Frequency Motor Drive for 400Hz/800Hz Radio Power?

[Nick England]

I have looked at using a VFD for 1-phase to 3-phase for a URT-3
transmitter. The issue is they can’t handle load current switching. Some
specs say they have quite long recovery times if you change load current.
So far I haven’t come across anyone with actual experience using a VFD for
a transmitter.
 Good luck. And keep us posted.
Nick

On Wed, Dec 18, 2019 at 5:36 PM Mark J. Blair <nf6x at nf6x.net> wrote:

> Do any of y'all have any experience with trying to adapt a variable
> frequency motor drive (VFD) for off-label uses such as producing 400Hz or
> 800Hz power for running aircraft radios? I gather that at the very least, a
> lot of output filtering would be needed to get clean sine waves from their
> unfiltered PWM output, and then even more input and output filtering to get
> rid of EMI hash. Most of the cheap imported VFDs I've seen so far appear to
> go up to 400 Hz, and some of them support up to 1000 Hz.
>
> The applications I'm thinking of include powering my GP-11 transmitter
> (around 1kW of 115VAC 800 Hz single phase), and powering the 618T-2 that I
> picked up at the last MRCG (around 1kW of 115VAC 400 Hz 3-phase). I have an
> 800 Hz aircraft generator and spline to V belt adapter as a backup plan for
> the GP-11, but something smaller and more efficient and quieter than a
> cobbled-together motor generator set would be nice.
>
> --
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> http://www.nf6x.net/
>
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-- 
Nick England K4NYW
Chapel Hill NC
www.navy-radio.com