Posted by Andy Baker on November 29, 2004, 6:19 pm
Greetings and apologies if I'm off topic...
I am currently working on an experimental and completely home built
co-generation system, however, I'm not an expert in the following area, so I
seek the guidance of others -
I have a turbine shaft spinning at about 10,000 RPM and I wonder if there is
a generator I can direct drive from this. I'd like to avoid a gearbox at all
costs. Total output will be anywhere from 4-10KW. DC or high frequency AC
output is fine, but I don't know if I'd want to deal with anything over 400
I know some people make their own alternators out of rare earth magnets and
hand windings for windmills and such, but I don't know what the practical
limits for them are, and most of them that I've seen have so many magnets in
them that the frequency would be nuts at such a high RPM - Maybe an un-godly
number of phases would be called for to accomplish such a feat? Though I'm
not sure if I'd ever want anything "I" built whipping around at 10,000 RPM
Does anybody have any input?
Posted by Me on November 29, 2004, 6:48 pm
If your looking for 10K Rpm, you should generate DC and then invert
it external to the generator. there certainly are OEM's that can build
units for that spec.
Posted by John Beardmore on November 29, 2004, 6:56 pm
At those RPM that may be quite a challenge ! Do some sums on the forces
Rectify it. The higher the frequency and the more phase, the smaller
The whole point about those is that they are low RPM.
Three is normal.
Time for google I think !
Posted by Andy Baker on November 29, 2004, 8:43 pm
There's plenty of static to be had in a google search, but as I plug away, I
find a few things, most however are in the 500 KW and up range :-(
Posted by Gymy Bob on November 29, 2004, 10:20 pm
I think you will be replacing bearings about once a month. Wood routers have
this problem at those speeds and keep any kind of silicone grease away from
it. Long fibres will burn it up.