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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
23.04.2014 - Crazypc.ro NH-D15
Test verdict: "Noctua își păstrează tradiția și continuă să ofere fanilor Noctua silențiozitate și performanță bună într-un singur pachet. Cu un design foarte reușit care a înlăturat problemele celebrului NH-D14, NH-D15 pe tot parcursul testelor s-a comportat impecabil." (Vlad Buluta, Crazypc.ro)
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23.04.2014 - ExtraHardware.cz NH-D15
Test verdict: "A to hlavne pre vynikajúce ventilátory, ktoré v kooperácii s pasívom perfektne fungujú i pri nízkej hlučnosti. K výslednému efektu lepšiu alternatívu asi nenájdete." (Ľubomír Samák, ExtraHardware.cz)
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22.04.2014 - WASD.ro NH-L12
Test verdict: "Daca cumva prindeti vreo reducere va recomand sa il achizitionati fara sa ezitati. Merita!" (Octavian Fulger, WASD.ro)
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22.04.2014 - ENG PC NH-U14S
Test verdict: "المشتت NH-U14S قدم أداءًا رائعًا غير متوقع وكان هذا بسبب اختلاف التصميم عن أخيه الأصغر NH-U12S أيضًا بسبب المروحة ذات القطر 14CM والتي يتحرك الهواء من خلالها بأسلوب أفضل من مروحة 12CM، أما عن الصوت فهو أهدأ ويشبه كثيرًا NH-D14 فينصح بهذا المشتت للوحات X79 ومعالجات LGA 2011 خاصة إن أردت كسر سرعتها، لذا أنصحك بتبديل مشتتك إن كان ذا صوت مرتفع وأداء أقل من المشتت NH-U14S" (Amir Abd EL Fattah, ENG PC)
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