Re: fan feedback algorithm
- From: "John_H" <johnhandwork@xxxxxxxx>
- Date: Wed, 18 Jan 2006 19:57:07 GMT
<acannell@xxxxxxx> wrote in message
news:1137609143.087179.306850@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I am working on an air-delivery system which provides a specific
> amount of air flow to a small box. The air flow into the box is
> determined by measuring the pressure at the air orifice in the box. All
> that part works fine and was figured out by the mechanical engineers.
> The problem is the control electronics, and specifically, the firmware.
<snip>
Do you need precise air flow or is this a situation where you need a minimum
airflow but would prefer not to outrageously overdrive the fan (such as for
audible noise reduction)? This approach would be easier.
Is the fan true DC such that compensating for the fan's resistance could
produce a nearly load-independent analog speed control? (The PWM would be
lowpassed or a DAC substituted, driving an amplifier with negative
resistance to cancel the fan coil resistance) Some "DC" fans - brushless
fans - have electronics that modulate the drive coils which wouldn't apply
to this approach. If this compensation could be included, the
load-independent speed control makes the control system much easier to
manage.
.
- References:
- fan feedback algorithm
- From: acannell
- fan feedback algorithm
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