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



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
25.11.2014 - BigBruin.com NF-F12 industrialPPC-2000 PWM
Test verdict: "In the end, all of these fans are worthy of the 'Recommended' award because they work well and you can count on them to do so for years to come. They also earn the 'Whisper Quiet' award because they can all operate in near silence while still providing excellent cooling. And finally, they earn the 'Great Idea' award, because it is great to see the Noctua line expanding to incorporate different options - and colors." (Jason Kohrs, BigBruin.com)
Submit

25.11.2014 - digit.in NH-D15
Test verdict: "The best CPU air cooler we've ever tested. Period" (Siddhant Sharma, digit.in)
Submit

25.11.2014 - TotlTech.com NH-D15
Test verdict: "الأداء هنا ممتاز جدا حيث انه يقدم أداء بفارق بسيط عن (درجتين الى أربعة درجات) عن المشتتات المائية المغلقة." (عن محمد سعد, TotlTech.com)
Submit

24.11.2014 - No Review Left Behind NH-D15
Test verdict: "If your wallet and your computer case can handle such a behemoth of a cooler (165mm in height) then I can't recommend the D15 enough." (Miguel Coelho, No Review Left Behind)
Submit