If you’re right, then it sounds to me like it’s something definitely worth
considering. I could imagine the issue of leakage and clearance tolerances can
be significantly minimised possibly eliminating the requirement of fancy seals
and impeller efficiency improvements can be improved with less effort and costs.
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Ian Woollard
Sent: Friday, 4 September 2015 9:52 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: arocket pump
Actually, I think it's fairly easy to build an induction motor into the
turbopump to directly drive the impeller, that way it's cooled by the
propellant flow- and never, ever going to overheat. Doing that kind of thing
seems to be far inside the state of the art for induction motors.
On 2 September 2015 at 14:53, Peter Fairbrother <zenadsl6186@xxxxxxxxx
<mailto:zenadsl6186@xxxxxxxxx> > wrote:
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
--
-Ian Woollard
