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Smooth Commutation Drive

Next to aerodynamic noise and bearing related noises, the so called "commutation noise" or "switching noise" can play a major role in the noise emission of axial fans with brushless DC motors. At each transition from one stator coil to another, the rotor receives a sudden torque pulse when the next coil switches on. Each of these torque pulses causes a minute deformation of the whole fan structure. Depending on rpm, torque and the material of the fan, this can result in noticeable noises.

Noctua's Smooth Commutation Drive system provides more continuous switching in order to achieve a smoother transition between the stator coils and thereby significantly contributes to the fan's overall quietness. The second generation of this technology (SCD2) further improves running smoothness and reduces minute noises in close proximity to the motor.


Noctua
27.02.2015 - PC Games Hardware 04/15 NF-A14 FLX
Test verdict: "Im Einsatz überzeugt Noctua durch eine geringe Lautstärke und eine angemessenen Kühlleistung, vor allem aber durch das eindeutig leiseste Lager im Test. Egal wie weit wir den Lüfter, unter Nutzung einer Lüftersteuerung mit Start-Boost, drosselten: Auch bei minimaler Luftbewegung können wir keine Nebengeräusche heraushören." (Torsten Vogel, PC Games Hardware 04/15)
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27.02.2015 - TechSupportForum.com NH-U9S
Test verdict: "The conclusion leaves me with the same thoughts that I have when I review any Noctua cooler and those are the thoughts of reviewing an excellently crafted product. Noctua coolers are known across the board for outstanding quality and it’s shown even further with each unit having a six year warranty. These little coolers are small, compact, and certainly worth the investment for any mATX, ATX or mini-ITX system." (Justin Vendette, TechSupportForum.com)
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27.02.2015 - HWLegend.com NH-U9S
Test verdict: "Il Noctua NH-U9S è un dissipatore realizzato con estrema cura in ogni suo dettaglio. La confezione, gli accessori, il cooler stesso e la ventola sono progettati a tavolino per offrire un’esperienza unica nel suo genere. Questo dissipatore nasce per imporsi come modello di riferimento di punta, nella fascia di mercato destinata ai sistemi compatti quali micro ATX e mini ITX." (Antonio Delli Santi, HWLegend.com)
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