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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landyacht318 wrote:IF your head is next to the motor with no physical separation like a wall, etc., you will likely hear the PWM or the 3 phase motor. It makes zero difference how you speed control the fan, the result is the same. It takes very little distance for the switching whine to fall off, and when on full, as quiet as the Noctra is, its blade noise drowns out the switching whine in close quarters.
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I think I need to order more 25KHZ motor speed controllers just for the fans in workshop and take steps to prevent their smoking. I use these as air filters and do notice the increased dust without them.
In this case its the fan from the onboard ESC running the 3 phase motor. I can power the fan with a lab bench supply or with the cheap PWM controller and the performance of the fan and the switching whine from either source is exactly the same.
