Speed controlling computer fans
For years I have been using the Silverstone fm121 as it comes with a remote mounted speed controlling potentiometer, goes as high as 110 CFM and 0.4 amps consumption. It is fairly quiet for this am...
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The diagram is a simplified equivalent of what the control chip does. You'll notice there is no control chip in the schematic, there are no protection diodes on the fets, etc.
Here is a quote from Nidec, from a white paper on fan control methods...
Pulse-width modulation of DC operating voltage to modify fan speed is not recommended. Transients generated by that approach can irreversibly damage motor commutation and control electronics and dramatically shorten the life of a fan.
Here is a quote from Nidec, from a white paper on fan control methods...
Pulse-width modulation of DC operating voltage to modify fan speed is not recommended. Transients generated by that approach can irreversibly damage motor commutation and control electronics and dramatically shorten the life of a fan.
