Re: Battery Powered Lawn Mowers - All Junk - Why?

In article <426e8a5b$0$1164$5402220f@xxxxxxxxxxxxxxx>, none@xxxxxxxx
says...
> John Larkin wrote:
> > On Tue, 26 Apr 2005 18:36:38 +0200, Rene Tschaggelar <none@xxxxxxxx>
> > wrote:
> >
> > [snip]
>
> >>Another aspect beside battery capacity is the
> >>safety aspect. While a petrol powered engine
> >>stops when encountering a root or a stone or such,
> >>an electric engine starts drawing much more power
> >>when braked. Thus a normal motor is inherently safer.
> >>
> >
> >
> > Controls, or even a circuit breaker, would take care of that. An
> > electric motor has, potentially, less moment of inertia, which would
> > make it safer in lots of situations.
>
> John,
> Are you sure that a 1 or 2 HP electric engine has
> less inertia than a 1 or 2HP petrol powered machine ?
> While the pseudothreephase asynchroneous machine with
> a 90degree cap delivers torque moreless constantly,
> a twostroke engine delivers torque only downwards,
> requires a flywheel to keep it going plus the balanced
> pistons.

The bigger advantage, as far as stopping, is that these (battery
powered mowers) usually use brushed PM motors and shorting them on stop
reduces the speed rather quickly.

Robert
.

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