I think this might be the real story here. Google about and you will find articles from 2003 talking about this nifty 100,000rpm switched reluctance motor and i

I think this might be the real story here. Google about and you will find articles from 2003 talking about this nifty 100,000rpm switched reluctance motor and impeller combination that Dyson's people were working on. I think the air mover is just an answer to "so what do we do with it?" I still want someone to say what the air mover sounds like. 100,000rpm should put all of the sound energy above 1,500Hz, and higher frequencies are easier to damp, so it is possible the thing is quiet. On the the other hand, the ad copy doesn't say "SILENT!!!".