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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
01.07.2015 - GameTechModding.com NH-D15S
Test verdict: "Prodotto ottimo!" (Enrico Luperini, GameTechModding.com)
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01.07.2015 - NextHardware.com NH-C14S
Test verdict: "Design sofisticati, materiali eccelsi e prestazioni da far impallidire la concorrenza sono ormai una costante in ognuno dei dissipatori targati Noctua. Ed i nuovi NH-D15S e NH-C14S non sono da meno grazie a strutture davvero robuste ed efficienti e a ventole estremamente performanti e silenziose." (Alfonso Basilicata, NextHardware.com)
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30.06.2015 - Play3r.net NH-D15S
Test verdict: "The bottom line is that the Noctua NH-D15S is a solid performer, as well as offering fantastic compatibility which is aimed to “help” enthusiasts and consumers with large memory heatsinks, as well as PCIe slots;" (Gavin Bonshor, Play3r.net)
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30.06.2015 - DVTests.com NF-S12B redux-1200 PWM
Test verdict: "With this airflow and static pressure measured through the tests, the fan is definitely capable to deliver astonishing cooling performance, which will be able to keep every processor cool and stable, while being cooled by a CPU cooler or water radiator compatible with 120 mm fans." (Dobrin Krastev, DVTests.com)
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