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'[EE]: Motor speed sensing'
2002\09\03@203808 by Barry Gershenfeld

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Microchip has a line of fan control products that feature the
ability to read motor speed just by watching the current.  It's
called FanSense Technology (TM).   On their site, look at
Products / Analog&Interface / Thermal / DC Fan Control

I hope they sent Roman a thank-you note!

Works on brushless motors as well--seems they have the same
commutating property.

Barry

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2002\09\04@125522 by Peter L. Peres

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On Tue, 3 Sep 2002, Barry Gershenfeld wrote:

>Microchip has a line of fan control products that feature the
>ability to read motor speed just by watching the current.  It's
>called FanSense Technology (TM).   On their site, look at
> Products / Analog&Interface / Thermal / DC Fan Control
>
>I hope they sent Roman a thank-you note!
>
>Works on brushless motors as well--seems they have the same
>commutating property.

Yes, but minus the VHF noise from the brushes.

Peter

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2002\09\04@133231 by Spehro Pefhany

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At 07:53 PM 9/4/02 +0300, you wrote:

>Yes, but minus the VHF noise from the brushes.


The current draw of these things is a nice clean signal. I'm not sure
if this use is patented, it's been around for some years, yet fans
with tacho signals are in use.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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2002\09\04@201338 by Peter L. Peres

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On Wed, 4 Sep 2002, Spehro Pefhany wrote:

>At 07:53 PM 9/4/02 +0300, you wrote:
>
>>Yes, but minus the VHF noise from the brushes.
>
>
>The current draw of these things is a nice clean signal. I'm not sure
>if this use is patented, it's been around for some years, yet fans
>with tacho signals are in use.

The usual way to 'add' a tacho signal to a fan without is to put a
2-resistor divider in it between the hot end of a coil (pick one) and gnd.
The divider reduces the 12V pulses to 5V ones. 220k * 2 works.

This cannot be trusted however, as some brushless controllers keep pulsing
the phases even if the fan is stalled. The ONLY way to know if a fan is
turning AND doing its job is airflow measurement (can be hot thermistor
type - far away from the fan in case the intake/outlet is blocked).

Anyway for usual situations I think that having a chip that does this is
nice (I haven't looked at the parts yet so I speak in general). I used to
do this with a LM393 half and with auto biasing (no potentiometer like in
Roman's scheme).

Peter

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