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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
29.07.2015 - Basic-Tutorials.de NH-C14S
Test verdict: "Noctua weiß auch, wie üblich, in Sachen Qualität zu überzeugen. Der hohe Produktionsaufwand fällt sofort aus. Die Kühlleistung spricht ebenso für sich." (Lukas Heinrichs, Basic-Tutorials.de)
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29.07.2015 - HiTechLegion.com NH-C14S
Test verdict: "While a builder typically has to make certain concessions when using a larger air cooler, the only concession made with the NH-C14S is lack of trouble caused by component interference. The NH-C14S simply provides excellent performance with great compatibility and low noise, essentially the SFF builder’s dream. With that, the Noctua NH-C14S comes highly recommended and is the recipient of the Hi Tech Legion Editor’s Choice Award." (George Cella, HiTechLegion.com)
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29.07.2015 - Neoseeker.com NH-L9x65
Test verdict: "All of these features add up to an exceptional heatsink cooler that will help make your HTPC or SFF system operate at peak performance." (Marvin Purdy, Neoseeker.com)
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28.07.2015 - hwresources.org NH-C14S
Test verdict: "Per la prima volta HWresources da l’Award Platinum ma questi dissipatori rasentano la perfezione sotto tutti i punti di vista." (Michele Mura, hwresources.org)
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