Maximise performance in terms of efficiency, power or economy?
One good setup will enable you to change ratios so you can have the motor running at its peak efficiency current rpms at full throttle given the voltage you are applying.
Another more economical would have it running out past the rpms at peak efficiency so that sort of power is only used under WOT acceleration or turns and lower current crusing at WOT – ie so any part throttle setting has the advantage of lower current draw but higher efficiency
Another would see the motor loading a little more heavily than peak efficiency so the potential thrust is greater this is not as economical but can be very good.
A practical ideal is probably a set of pulleys like a drill press or a motor cycle gearbox
Electric motor performance is maximized at any given voltage by setting it to run WOT at the rpm/current (in practice the same point) at which the motor specs show it to be most efficient. From there you can go either way by say +or -5 percent to get an efficient setup. Most people are running very innefficient setups and not realising the potential of the system used
From:
Sent: Monday, 19 September 2011 12:55 PM
To:
Subject: [Electric Boats] Re: reduction drives
I got everything I needed pretty cheap at www.surpluscenter.com
Your gear ratio depends a lot on your prop. I went with 1:2.7 and wish I had gone more.
RandyB
--- In electricboats@yahoogroups.com, "svcabernet" <bsmisner@...> wrote:
>
> Hello all,
>
> I've been lurking here for a while, which has paid great benefits as I've been putting together a parts list for an electric drive for my Cascade 29.
>
> Given the limited budget I've decided to "build" the system myself rather than go with one of the tried and true manufacturer's assemblies.
>
> The one component(s) I've been having trouble with is the reduction drive. I've decided to use timing pulley's/belts or sprockets and chain along with captured roller/thrust bearings but am having a tough time sourcing them. I wouldn't be opposed to a gear reduction either provided a "bullet proof" reputation. The motor of choice is the ME0907 for it's lack of brushes, performance, and affordability. By my calc's a 2:1 to 2.5:1 reduction will be needed to maximize performance. Any ideas would be appreciated.
>
> Thanks,
>
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