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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
24.10.2014 - HWready.it NH-U9B SE2
Test verdict: "Buone prestazioni e silenziosità in dimensioni ridotte. Acquisto assolutamente consigliato, garantito!" (Santoro Luigi, HWready.it)
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24.10.2014 - PCkoloji.com NF-A4x10 5V
Test verdict: "A serisine eklenen A4x10 5V özel ve A8 FLX, PWM, ULN ile A9 FLX, PWM modelleri beklentileri fazlasıyla karşılıyor." (Gorkem Yildirim, PCkoloji.com)
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23.10.2014 - SCORE 246 NH-D15
Test verdict: "NH-D15 je nejsilnější vzduchový chladič vůbec, navíc je také jeden z nejtišších na trhu." (Peter Hucík, SCORE 246)
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22.10.2014 - El Chapuzas Informático NF-A4x10 5V
Test verdict: "Los ventiladores Noctua NF-A4/A8/A9 demuestran una vez más el buen hacer de Noctua, pues ofrecen un gran rendimiento con una sonoridad mínima. Además, llegan acompañados de un excelente kit de accesorios, algo de lo que pocas marcas pueden presumir." (Iván Martínez, El Chapuzas Informático)
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