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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
21.10.2014 - PCGamers.net.au NH-D15
Test verdict: "The NH-D15 is a great option for those chasing a super quiet rig and builders who don't want to use closed loop water coolers but still want to chase heavy overclocks. It isn't cheap but it's build to last and performs well at a whisper. This is a well finished and thought out cooler and a worthy successor to the iconic NH-D14." (Phil Carroll, PCGamers.net.au)
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21.10.2014 - HwT.dk NH-D15
Test verdict: "Noctuas nye topmodel lever uden problemer op til forventningerne. Et lækkert kvalitetsprodukt som leverer hele vejen igennem, især når det kommer til køleevne. Det er desuden rigtigt flot at se hvor meget Noctua har forbedret sig i forhold til den gamle topmodel, NH-D14, som stadig er en god køler, bare ikke helt så god som den nye NH-D15." (Lynge Poulsgaard, HwT.dk)
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20.10.2014 - TechTesters NH-L12
Test verdict: "De NH-L12 is net als z’n broertjes en zusjes bedoeld is als een product voor echte liefhebbers die graag iets meer uitgeven om net die beetje extra prestaties te halen, of die de typische Noctua-ervaring reeds waarderen, en met dat in het achterhoofd doet de NH-L12 het zoals verwacht uitstekend." (Stephan Overbeeke, TechTesters)
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20.10.2014 - videotesty.pl NF-A8 PWM
Test verdict: "Dla bardziej wymagających użytkowników polecam zainteresować się tą serią." (Paweł Borysewicz, videotesty.pl)
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