Alt-BEAM Archive
Message #00287
To: Justin jaf60@student.canterbury.ac.nz
From: Bob Shannon bshannon@tiac.net
Date: Mon, 08 Feb 1999 17:50:54 -0800
Subject: [alt-beam] Re: Fan motors
Justin wrote:
>
> A reasonably accessable source of motors are from old cpu heatsink fans.
> Given that this is obvious, and that I havn't heard anyone talk about
> them, I'm guessing they're no good for BEAM. I seem to recall them being
> of the 12v variety, which would be a big blow to BEAM usefulness. Can
> you get 5v versions or do they all plug into the 12v plugs?
> Other than the voltage issue, they would seem to be efficient and small
> and easily availible. Has anyone messed around with these?
Yes, there are also 3.3 volt versions used in Pentium II laptops.
There are several reason NOT to use these motors.
First, you cannot easily remove the motor from the fan.
Secondly, their efficiency (as motors) is not very high.
Thirdly, these motors use small hall effect chips and internal switching
logic
to power the coils, so they do not perform much like pager or walkman
motors.
They interrupt power to the coils based on the rotational position of
the fan,
and this will not make your SE very happy.
They are kinda cool if you want a CPU based robot to blow out a candle
in a fire
fighting contest however!
------------------------------------------------------------------------
eGroup home: http://www.eGroups.com/list/alt-beam
Free Web-based e-mail groups by eGroups.com
Home