Alt-BEAM Archive

Message #05034



To: beam@sgiblab.sgi.com
From: Bob Shannon bshannon@tiac.net
Date: Mon, 05 Jul 1999 09:57:07 -0400
Subject: [alt-beam] Re: Something funny with the 1382 voltage triggers?


JVernonM@aol.com wrote:

> In a message dated 7/4/99 5:34:38 PM Eastern Daylight Time, bshannon@tiac.net
> writes:
>
> > The problem is lock-up under full sun. The problem does not happen with
> > indoor
> > lighting
> > unless the photovore is held abut 5 cm from a full spectrum desklamp.
> >
> Hey Bob,
> I think I had a similar problem with Spinner. It uses a CD drive motor as
> well. It is the long, flat on two sides motor.

Let me guess, about 2 cm long, 5mm wide at the flat sides, 6mm thick from
flat side to flat side, and 8mm wide on the rounded sides, right?

If so, you probably have a much better motor than you might think. Was this the
head positioning motor?

I think you have a platinum wire motor there my friend. I think they are close
to
a 1gm/cm in torque at ~35 ma, many times more efficient than pager motors, and
they last a hell of a lot longer too.

There was a post recenlty of an Ad for similar looking motors, but I could not
tell
if they were the same or not.

If you can find them, try a pair of Mabucci FF-K10WA motors. They are similar,
but
only 1 cm long, and beat the heck out of pager motors for torque. (I've spun
pager motors
around backwards with these gems in shaft to shaft torque testing with equal
current)


> When hooked up to a large
> cell, it would lock up if put in the sun or close to a halogen light source.
> It seemed to be something inside the motor itself. I built Spinner with it,
> which uses The smallest Trigger (I don't remember the letter) and two
> calculator cells. The lower voltage works every time. I don't know if you are
> experiencing the same problem, but it sounds similar.
> Jim

Sounds like the same motor, and the same problem. But these motors are not
the source of the problem. I've been using these motors for a long time without
having this problem before. This is an SE design issue.

In fact, I've used exactly the same motors, and 6,600 uf of capacitance on a 'big
wheel'
photovore thats currently living overseas where it gets lots of sun. It never
locks up, and
its using 1381-J triggers as well.






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