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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
21.05.2015 - hardwareinside.de NH-L9x65
Test verdict: "Insgesamt lässt sich festhalten, dass Noctua mit dem NH-L9x65 einen soliden Top-Blow-Kühler für fast jeden Sockel geschaffen hat, der alle ihm gestellten Aufgaben zuverlässig löst." (Sebastian Weickelt, hardwareinside.de)
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21.05.2015 - hwresources.org NF-F12 industrialPPC-2000 PWM
Test verdict: "Noctua continua a stupire in tutte le fasce di mercato. Le versioni testate oggi ci hanno convinto appieno, in particolar modo le versioni Industrial PPC, fan che rasentano la perfezioni in ogni aspetto." (Michele Mura, hwresources.org)
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21.05.2015 - PC-Max.de NF-S12B redux-1200
Test verdict: "In jedem Fall verdienen auch NF-F12 industrialPPC-2000, NF-F12 industrialPPC-3000 PWM und NF-S12B redux-1200 unsere Redaktionsempfehlung." (William Zwingenberger, PC-Max.de)
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21.05.2015 - ComputerForum.de NH-L9x65
Test verdict: "Der NH-L9x65 ist aktuell für uns ganz klar eines: Der König unter den kompakten HTPC-Kühlern!" (Benedikt Weiß, ComputerForum.de)
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