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@classiccmp.org> wrote:
>
> Would a motor generator be less expensive?
>
>> On Oct 12, 2024, at 7:51 AM, hupfadekroua via cctalk <cctalk@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
