I contacted Matt Shumaker to see if he knew of any more powerful RC motors. He recommended this one: http://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=5139
There's also a 130v/rpm motor of similar size. The main thing I noticed after purchasing the 180v/rpm motor is that the windings are not varnished. The motors are probably only designed for a few hundred hours of use if that. If planning to use it, I would first remove the can and varnish the windings. Also, the windings didn't pass a 100v megger test. They did pass a 2,000k ohm DC resistance test with a DVM though. The phase to phase resistance was very low at 12.5 mohms. There are no hall sensors. The motors need a special controller to take EMF feedback from the windings themselves to sense position. Hence, it may take some extra hall sensors to get these to work with a Kelly controller for example. They would make one heck of a powerplant for something like a Schwinn scooter, or even a larger road scooter like an Oxygen Lepton. They wouldn't be too bad for a dirt bike if the speed was kept slow enough. On Wed, May 7, 2008 at 11:22 AM, john fisher <[EMAIL PROTECTED]> wrote: > Its electric anyway, and some nice build details, including use of a > very-high efficiency RC motor and RC controller > parts. and data logging. > > http://www.wisil.recumbents.com/wisil/shumaker/default.htm > > Things I like: > its light. > its really light, well its a bicycle. :) > the use of high-rpm RC plane motor - terrific KW-weight ratio. > Nice packaging > DAQ > > Things I wonder about: > the home-made drive line to gear down that motor to usable speeds and > torque > that motor- will it stand up to regular use? > > I envy: > his CNC tools > > What ifs: > what if you used a couple of these motors to drive the front wheel of a 2wd > dirt bike? That would be way simpler than > all the other 2wd systems, though limited to about 6 hp. You'd have to have > a planetary/some_other gearbox custom built, > possibly inside the hub. But 6 hp might well be enough on a light bike. > > I think this project captures the lightest possible end of the spectrum > from bicycles to motorcycles. For a heavier > project, is it worth giving up the thermal mass of a big torquey motor if > your batteries weigh 150 lbs? Maybe not, but > MC projects are always looking to get lighter. > > hope you find it interesting and not too OT. > John > >
