Re: extension cord powered tractor

On May 3, 7:10=A0pm, gaby de wilde <gdewi...@[EMAIL PROTECTED]
> wrote:
> hey, I could use some help here.
>
> I'm trying to figure out a good way to trans****t power over a few km
> using extension cords (to put it bluntly)
>
> The image is not very imaginative at all.
>
> http://gabydewilde.googlepages.com/grid-powered-tractor.jpg
>
> A tractor drives up and down a field, it can thus roll out - on it's
> way to the end and roll up - the extension cord farming it's way back.
>
> An electric motor is cheap, the problems with the invention are
> obvious however, the power drop becomes significant when the cord is
> more then 100 meters. The project demands critical analysis of cables
> in contrast with power demand, flexibility, price, the different
> Country grid voltages and the size of their average field.
>
> The system cant run without batteries entirely because an EV can draw
> surges way beyond that what the grid can supply. A flywheel can cut
> off the biggest peek. The more consistent high demands can be covered
> by an additional direct current motor.
>
> For example one 3.5 kw AC motor and a 10 kw DC motor. If you have 1
> kwh worth of batteries you can use 13.5 kw for 6 min tops. If you only
> draw 3 kw there is 500 Watt available to recharge the small battery
> pack. If it uses 3kw consistently for 2 hours the battery would still
> recharge all the way. Big heavy low performance batteries are cheap
> (could even use second hand). But if one was to put those in an
> electric car it will never get any good range before getting to heavy.
> The extension cord allows us to make use of low performance batteries.
>
> Things you already knew:
>
> 60 min is 10 times as big as 6 min
>
> 10 hours is 10 times as big as 60 min
>
> So using the same type of batteries the pack that allows us to work
> for 10 hours is a hundred times more expensive as the 6 min pack. But
> we don't use the expensive kind of cells thus the price will drop
> below 1/100 that of a conventional EV.
>
> I think it will require to step up the grid voltage to trans****t it
> over long distances, but how much? Perhaps it is better to draw less
> power from the grid to allow for a thin wire.
>
> More power from the batteries will make it more expensive and heavier
> which costs more power again.
>
> There is lots of stuff to figure out.
>
> Anyone can picturing a tractor driving over it's own wire.
>
> Should picture that while driving the tractor yourself. :-) Then it
> becomes obvious there are plenty of things to drive over. Houses,
> people, crops and yes even a wire. If one was to really manage to
> destroy it one can repair it in 5 min.
>
> The only real problem I see is the length of the wire. Can you give me
> an idea how bad that gets? How deep can this kind of tractor get into
> the field using reasonable means? Because it is so long a small change
> makes a huge difference.
>
> What do you think about this?
>
> My thanks in advance,
>
> gaby de wilde
>
>
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y.go-here.nl

A basic 12 volt battery level will suffice. And is safer than trying
AC.

10 guage wire will have a loss of about 1 percent over one mile I
guess.

10 guage is physically to heavy, making a practical size of wire
dictate. Maybe 16 guage is more controlable.  A hard invention is what
you propose.

A better solution is to use batteries. NO line losses and NO cable
control issues. Except the issue is expense for batteries.

So weigh the cost of making a special cable system versus batteries. A
ten golf cart size battery might suffice.  So maybe $10K for a single
battery set.

Alot.

So cable handling becomes a cost limited aspect.  And so the inventor
goes to work. $10k cost limit for a special sellable system.  Maybe
good enough for golf courses to use.

A location of power and an exact pattern of cutting was to NOT be
allowed in my design.  Arbitrary power connection locations and
cutting patterns allows a larger sales likelyhood.

The trick is to always pay out cable.  Never let the cable lie
untaught.  This prevent cutters from running over the cable. Think of
having a five foot tall pole with the reel run to th etop.  A tall
pole allows cable pay out. A completely noninterference cable system
can be designed.

*   *
|         *
|              *
| pole               *
|                          *
real                             *cable payout(constant tension X)


So the tension always X control system  MUST BE created/invented.

What is to be done is to make a real control system and it will cost
real money to have an inductrial control company make.  BUt it will
work great.

A tension meter allows a constant tension so place one of these near
the tractor.  It will be... invent hard here now.

A lever near the pole top that reads the tension.

| _____lever
|
|
|
|pole

An angle readout for this lever determines the payout angle!!!! So a
special computer input angle reader is needed.  MAybe a mechanical
computer can do the same.

Retract- when lever angle drops
Payout- when lever angle is always maximum.

So two simple control rules allow an exact cable control!

A speed of retraction and payout is a matter of motor speed control.
A limit on tractor speed can be implemented to disallow over speeding
the cable control.

So place direction switches and rate speed variable resistors on the
angle measurer.

A good designer can finish this concept detail

Happy tractoring.