RE: [DML] Re: Time for a new Speedo mechanism ...

["Nick Kemp" <nkemp@xxxxxxxx>]

I did some quick research (Google) and it turns out that there are a lot of
cars that use motors to drive the speedo needle and this goes back quite a
while:

"It is not until the mid-1950s that automobile speed measurement enjoyed its
next major technology leap with the introduction of the electric speedo --
originally developed by VDO for city buses. Instead of communicating wheel
revolutions by means of a lengthy shaft, the rotational speed of the wheel
or transmission was transformed into an electric signal with a dynamo. An
electric motor on the speedometer then used this current to move the needle.
Parallel to this development, VDO developed a moving coil instrument in
which the voltage of the current generated by the dynamo is displayed as the
current speed. Also, a stepper motor was developed to drive the odometer. It
all fit into an 80 millimeter housing that remained the worldwide
speedometer standard well into the 1980s. "

From: (http://www.siemensvdo.com/com/pressarticle2002.asp?ArticleID=11001e)

This is especially true with electronic sensors.

Nick
---

Funny, I played with that stuff, too years ago.

I guess it could work but you would have to connect it almost
directly to the speedo. You'd have to get rid of the cables
and the lambda counter as they would need too much force to be
turned. Without that stuff a small motor should be able to drive
the speedo and odometer.
I had some motors with a very soft commutation that may be perfect
for this. Maybe I still can find some of them, we don't produce
them anymore for more than 10 years....

funny...
Elvis


>
> I once connected two stepper motors together, no power supply.  Each time
> you manually rotated one the other would rotate from the power generated
> >from the first.  So is it possible to do the same on the D?  There may
> not
> be enough power on the second to rotate the speedo but that is solveable.
> Just thinking ... I was working on the D but when 10,000 of my closest
> friend ... mosquitoes, showed up for dinner that came to an end.
>
> Nick
>





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