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

[Mark J. Blair]

> On Dec 18, 2019, at 3:32 PM, Nick England <nick at navy-radio.com> wrote:
> 
> 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.

That corroborates with other things I've read about adapting VFDs even to motors that they're meant to run: folks said that in converting something like a Bridgeport mill, you need to get rid of all of the original switching on the machine and wire the VFD directly to the motor. I guess that makes sense if the VFDs don't tolerate step changes in the load, since that would imply that even a motor-reversing barrel switch between the VFD and motor would be Bad.


-- 
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/