[Milsurplus] 400 Hz Power

[Peter Gottlieb]

Much easier:  I check it with my ears.  The 400 Hz sound is unmistakable!


On 1/16/2011 4:41 PM, J. Forster wrote:
> 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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>
>