12 Oct
2024
12 Oct
'24
7:30 p.m.
Years ago I commented (on this list, probably) that a "VFC" would likely make a
good 400 Hz supply. VFC is "Variable frequency controller", a device that takes
mains input and turns it into three phase output of a frequency of your choice. The upper
frequency is typically fairly low; I don't think mine reaches 400 Hz but then again it
cost me less than $100 for a unit that can drive a 3 hp motor. That one takes either
single or three phase (220 volt) input; larger ones are normally specified as 3 phase only
though chances are they would in fact work if you fed them single phase power.
I'd expect them to be a whole lot cheaper than motor-generator sets, and also far more
available and reliable.
paul
On Oct 12, 2024, at 8:24 AM, Michael Thompson via
cctalk <cctalk(a)classiccmp.org> wrote:
Would a motor generator be less expensive?
> On Oct 12, 2024, at 7:51 AM, hupfadekroua via cctalk <cctalk(a)classiccmp.org>
wrote:
>
> Hi all,
>
> after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
>
> These systems as other systems before are using 400Hz psus.
>
> One approach would be to use a 50Hz/400Hz power converter. There are ones on the
market creating almost pure sinus output with minimal harmonics.
>
> Another approach would be to substitute the old psu by modern ones, possibly by DC-DC
converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
>
> Best
>
> Andreas