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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
21.07.2014 - RealHardTechX.com NF-S12B redux-1200 PWM
Test verdict: "En definitiva, un producto absolutamente recomendado." (José Romero, RealHardTechX.com)
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21.07.2014 - bcchardware.com NH-U12S
Test verdict: "Noctua has set the bar pretty high for themselves, and like usual, they've been able to live up to their legacy with the NH-U14S and NH-U12S CPU coolers." (Jason Schneider, bcchardware.com)
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21.07.2014 - ProfesionalReview.com NF-A14 industrialPPC-2000 PWM
Test verdict: "Estamos ante una serie que trae un soplo de aire fresco a la marca con nuevos colores, un rendimiento bastante bueno en todos los casos para el ruido generado si los usamos para las aplicaciones correctas, 6 años de garantía, y con la seguridad de una marca que responde bien ante cualquier problema." (Miguel Ángel Navas Carrera, ProfesionalReview.com)
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19.07.2014 - Vortez.net NF-P14s redux-1500 PWM
Test verdict: "A new styling theme, excellent performance and a refined accessories kit allows the Noctua redux series to pick up our prestigious gold award." (Ed Hume, Vortez.net)
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