[Milsurplus] 400 Hz Power

[J. Forster]

A Cautionary Tale:

A few years ago, I got a commercial static inverter with a set of
frequency select switches on the front panel plug-in.

I hooked the unit up to a NOS BC-929-A display and powered it up. The
scope came to life nicely....  for a couple of minutes, then poof!

Turns out, IU missed the decimal point on the frequency set module... 
aircrafdt stuff really does not like 115 V at 40.0 Hz.

Moral:  Check your power with a scope!!

-John

================



> Quite a number of VFDs for motors can go to 400 Hz and are 3 phase.
> There are some that will work on single phase input right off the shelf,
> however, most of the larger ones are configured for 3 phase input and so
> if all you have is single phase you will need to do some mods to the
> front end rectifier circuit.  I've used these things successfully to run
> 400 Hz equipment and the modern ones are PWM and put out a decent
> looking sine wave.  You'll want one with a keypad for setting parameters
> or you're going to be searching out software to connect and program the
> thing, which you should try to avoid.  They can be set to power up to a
> certain state, such as 400 Hz output.  Each horsepower of rating will
> put out 746 watts, so for example a 4 HP drive is good for about 3 kW.
> Select a 120/208 output unit.  This is the most efficient way to get 400
> Hz in your lab.
>
> Peter
>
>
> On 1/16/2011 3:04 PM, Richard C. Grosser wrote:
>> There seems to be a lot of people interested in a source of 400hz 3
>> phase
>> power. I have an old rotary inverter from a PBY, however it is very
>> heavy
>> and very noisy. I have designed and built a relatively simple static
>> inverter that supplies 110 vac 400hz 3 phase as well as 24 vac 400hz
>> single
>> phase. It is quite small ( 10" x 10" x 4") and weighs less than 10 lbs.
>> I
>> built the digital circuit on a wire wrap board. If someone has the time
>> or
>> interest in designing a circuit board, I can make the Cadence OrCad
>> files
>> available to them. In the mean time, the circuit is available for
>> download
>> at www.richardgrosser.net/inverter.pdf.
>>
>> If you have any questions, email me at Richard at richardgrosser.net
>>
>>
>>
>>
>>
>> Enjoy!
>>
>>
>>
>> Richard C. Grosser
>>
>> Palm Springs Air Museum
>>
>> 745 N. Gene Autry Trail
>>
>> Palm Springs, CA 92260
>>
>> (760) 778-6262 X231
>>
>> Cell: (760)-898-6888
>>
>>
>>
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