Products | Technologies | Support | Press | Reviews | Where To Buy

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.

06.10.2015 - Always More Digital NH-C14S
Test verdict: "В итоге кулер Noctua NH-C14S получился весьма неплохим и заслуживает того, чтобы на него обратить внимание при покупке, пусть даже по современным реалиям его цена будет «кусаться», так как его рекомендованная стоимость равна 74,90 доллара." (Zastavnoy Mikhail Ivanovitch, Always More Digital)

06.10.2015 - NH-C14S
Test verdict: "Kto powinien zatem zainteresować się C14S? Na pewno posiadacze wydajnych procesorów po optymalnym OC, zamkniętych w wąskich obudowach, a także do wysokich radiatorów RAM-u. To główna zaleta konstrukcji, choć kusi także 6-letnia gwarancja." (Kamil Homziak,

06.10.2015 - NH-D15S
Test verdict: "Ter algo como o NH-D15S é ter a supremacia máxima em dissipadores de computadores com troca de calor a ar." (Carlos Xandelly,

06.10.2015 - Digital! Oktobar 2015 NH-C14S
Test verdict: "[T]eško je ne preporuciti ovaj model, s obzirom da je rec o retko kompletnom i svestranom proizvodu." (Nebojša Todorović, Digital! Oktobar 2015)