[AR] Re: arocket pump
- From: Peter Fairbrother <zenadsl6186@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 02 Sep 2015 14:53:39 +0100
On 02/09/15 12:13, James Fackert wrote:
Dyson battery vac... 100,000 rpm brushless motor driving turbo like
radaxial blower? Maybe in the 1 horsepower range run conservatively
with long life?
Maybe...
Some problems - first, it's only about 200W normal, 330W at boost, which
isn't really enough to be useful.
Second, the design is such that the integral fan is necessary for
cooling, especially for the IRFH 7932 MOSFETS, which are surface-mounted
and which do not have heat sinks.
I suppose you could get around that, but the rotor is tiny, about 7.5mm
dia by 8mm long - I haven't tried, but I don't think that it would last
more than a few seconds at useful power before getting too hot for the
magnets, unless some sort of cooling was used.
Incidentally, this raises a point about flight electric motors which I
don't think has been mentioned before - in vacuum they will overheat.
-- Peter Fairbrother
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