I am looking into Green Motorsports, The motor they produce weighs in at 37lbs and is 21 hp each They are water cooled Brush-less and completely sealed for marine environment, 48 volts, Ac not sure if its 50 or 60 cycles, 4000 rpm. I may need 6-8 of these motors, The question now is how big of a gen set would I need to continually run them at half speed? Has anyone used them or done research on them?
--- In electricboats@yahoogroups.com, Matthew Geier <matthew@...> wrote:
>
> On 11/01/11 16:57, ibles_world wrote:
> >
> > I also was on another site and it looked as if multiple motors could be setup in tandem with one another, This looked like a valuable option, I could mount 2 or more smaller drive motors with clutches to a single shaft,
> You don't need the complication of clutches to disengage motors. You
> just leave them all connected and run them in parallel at lower power in
> each motor.
> Motors are often ganged to get extra power.
>
> Even if it became necessary to cut the power to one motor (say due to
> an electrical fault) unlike an ICE there isn't much mechanical
> resistance in leaving it in line and spinning it dead. (unless it's
> shorted out and acting like a generator with a shorted output, but that
> would be unusual.) Having a motor mechanically jam would be very rare.
> Your clutch arrangement would be more likely to fail.
>
>
> Electric motors also have very large operating speed that produce full
> torque. A variable gearbox isn't generally needed. Forced cooling might
> be needed if high torque at low speed is needed as the motors may not be
> spinning fast enough to self-ventilate. Rail applications all have fixed
> gear ratios and look at the loads railway locomotives drag.
>
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