I agree on the VFD aspect. It's a solution but do beware the need for load reactors. Also, most must be derated if being driven with single-phase.
On the 28VDC-400Hz MG sets, you might try Fair Radio in Lima OH.
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Lots of old military gear used a motor/generator to produce 400hz from mains supply. This would be by far your best option. Motor vsds have been suggested, there are several problems with these as they are but they can be modified to suit your application. It's not a trivial mod though.
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wonder if a car alternator could be hacked, bypass the diodes to get 3 phase and run it at 4000rpm (I think) to get 400Hz controlling the voltage might be tricky though
-Lasse
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No it couldnt.
Na, the output voltage is linear with rotation speed and magnetizing current. Just dont do the feedback with that current the wrong way, the connected electronics will explode(dont ask me how I know.....).
If you are running at constant RPM, it should be really easy to regulate. (See my alternator regulator patents... but run the field on its own supply.) ...Jim Thompson
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=A0 =A0...Jim Thompson
so if you can get to the phases and drive it at 4000rpm (12 poles) use a bench supply to drive the field and it might work
think it would do 115V ?
-Lasse
We had a system at work that used a motor-driven alternator to provide
300 Hz 220 V (or so) at a few watts - We replaced it with a solid-state system: Oscillator, phase shifters and audio amplifiers driving normal power transformers backwards to get the required high voltage.-- Peter Bennett, VE7CEI peterbb (at) telus.net GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca
They may be designed that way, but if you do the setup to turn all the feedback and vector parameters to zero / off, you get a sine wave voltage out, on the examples i've looked at. I used to
17.5Kva unit to drive an a/c 400Hz to 1600Hz 3Kva motor generator. Not all the vfd's go to 400Hz, so it's good to check the spec before buying. Another point is that they are not normally line isolated, so there are safety issue as well.Another solution would be to buy a s/hand avionics solid state inverter. I have a Pacific Power 240v 50Hz to 750 Va 3 phase 115v
400Hz in the lab now, which came from an avionics sale. Elgin Inc and others also specialised in this sort of kit. Ebay or even dealer prices probably a few hundred $ and it's just plug in and go, which matters if you time is valuable...Regards,
Chris
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