Re: 12 volt automotive fan speed controller

On Sun, 25 Nov 2007 14:29:54 -0800 (PST), melee5@xxxxxxxxxxx wrote:

On Nov 25, 5:44 am, "mark krawczuk" <krawc...@xxxxxxxxxxx> wrote:
hi, sorry , i suppose i should have said, i just need a potentiometer to
control the speed , it doesnt need to be controlled by cabin heat
etc...., the fan controller in my car isnt working and they havea tendency
to fail , so i am trying to construct a bit more robust one . everything
is working fine the heat , aircon , its just that the factory controller
is broken and the fan always stays on really low,.

thanks,
mark k

[snip]


Most

CHEAP

auto heater blowers use wind cooled wire wound resistors in
series with the blower motor circuit to attain low and medium speeds
with high speed being a direct connection to 12+ volts. Some
regulatory body specifies that a super low speed is mandated to be on
all the time to guard against carbon monoxide poisoning, which is
probably the low speed you've noticed.

[snip]

The controller design I did for Bosch (Bühlertal, Germany) for
inclusion in the Mercedes AC/heat system was a 3-phase electronically
commutated motor... custom microchip plus 3 N-channel MOSFET's...
continuously variable speed, but controlled acceleration (so that the
chief engineer couldn't hear any whine when he stuck his head in the
air duct ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave
.

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