Quote:
Originally Posted by kalee20
I've come across small avionics fans, 400Hz induction motors, a couple of inches in diameter, but they've always been 3-phase. Naturally, they run mighty fast!
I'd be surprised if there was a need for a single-phase 400Hz fan. If 400Hz is available it would normally be 3-phase, from a 3-phase generator.
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They can be deceptive, because these split phase single phase fans have three terminals on them, and on the face of it look like a 3 phase product, but many of the small sized ones made by this company used in Avionics equipment run off just one phase, so they need the capacitor.
In the article I posted above, pg 18 or so, you can see a photo of the one used in the video monitor. I have seen these used in aircraft static inverters too. They really sound quite amazing as they start up and reach their operating RPM, you would swear it was a jet engine starting up. This is why I had to replace the one in the video monitor with a quieter DC fan. I also found if you lower the supply voltage they slow down well, but even running this one from 40V 400Hz, it was still very loud.
If you look on one of their product lists for these about half of the ones listed are 3 phase and the other half single phase:
http://www.rotron.com/-/media/ametek...fmfv.pdf?la=en
The small tube-axial fans list two one phase models and one three phase model:
http://www.rotron.com/-/media/ametek...x22e.pdf?la=en
These fans of course being avionics parts are like mil spec quality. I don't think I have every seen a better made fan than the tube-axial fan in my video monitor.