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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
24.04.2014 - Hardware Ready NH-D15
Test verdict: "Per prima cosa dobbiamo fare i complimenti a Noctua per il lavoro svolto in questo dissipatore, come potete vedere dai test si evince che il Noctua NH-D15 è superiore a tutti gli altri dissipatori" (Matteo Russo, Hardware Ready)
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24.04.2014 - HardZone.es NH-D15
Test verdict: "Lo han conseguido. Lo que parecía imposible ha sucedido, y Noctua ha logrado mejorar el NH-D14 con este NH-D15. No solo han mejorado su rendimiento térmico, sino que han creado un disipador prácticamente inaudible incluso bajo máxima carga, con una instalación que no puede ser más sencilla, y además han solucionado los problemas de compatibilidad con módulos de memoria RAM de disipadores grandes que achacaba su predecesor. Dicho esto, solo podemos levantarnos y aplaudir: ¡Bravo, Noctua! (Rodrigo Alonso, HardZone.es)
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23.04.2014 - XtremeSystems.org NH-D15
Test verdict: "I was really surprised that the Noctua could keep such a low temperature, but I ran the test three times and reapplied TIM every time looking for what I did wrong, but I couldn't find anything odd. As for the load temperatures, all I can say is I have a huge smile on my face still." (Ambrosidou Nat, XtremeSystems.org)
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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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