Biggest drawback is that hub motors revolve the case around the shaft. Power cable enters through a non-rotating race in the shaft. So coupling the output has to be finagled with much ingenuity. Typically they are operating at less than 600 rpm no load, less than most boat prop shafts. Might work best on an old outboard lower unit conversion since they are typically about 500 - 1000 watts @ 26 volts
Sailonner
--- In electricboats@yahoogroups.com, Kevin <pembertonkevin@...> wrote:
>
> Hub motors are not all that high RPM if you are looking at lets say a
> motor made for a 24" bike. Consider the fact that the field is larger
> dia. making for higher torque, that combined with a possible large pole
> count make an ideal low RPM motor.
>
> Find a way to make a plastic cooling jacket on these motors and run
> antifreeze or oil for coolant and you can run them at higher voltage
> than designed and get more power from them.
>
> I have been thinking about this as a choice, hope you do something with it.
>
> Kevin Pemberton
>
> On 05/17/2010 01:39 AM, roger.dann wrote:
> >
> > sorry guys if discussed (search of hub motors=0) but being in China
> > and seeing low price of bike hub motors here begs the question: isn't
> > there a use in our marine world? I assume overheating and too high
> > rpms are the drawback but what else? Ebikes with hub motors and
> > Lithium Ion batteries are getting cheaper.
> >
> >
> >
>
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