Silent fans thanks to optimised impellers and brushless DC motors

The increased heat generation of electronic devices requires more powerful but also low-noise fans. To meet these requirements, Nidec (Sales: Dynetics) manufactures fans with innovative fan blades that enable a consistent reduction of vibrations.
As the performance and packing density of devices with electronic components increases, so does the need for effective cooling. The most commonly used and cost-effective method is convection cooling, which utilises air as a medium for heat dissipation through forced air movement.
Noise generation in fans often results from various conditions, including airflow and motor commutation.
Current measures to eliminate or reduce airflow noise are based on extensive analyses and do not pose any technical problems.
10
MAY 2024
Innovative Technology
G Series

Impeller design with computational fluid dynamics (CFD)

The design of the impeller requires iterative optimisation. Various simulations are necessary to identify the causes of power loss and noise development, such as blade leakage caused by air turbulence (vortex) and other aerodynamic effects.
In addition, innovative design techniques for fan blades using CFD are used to design rotor cascades for low-noise fans. CFD is a form of numerical analysis that is used to analyse and solve flow problems.

Noise generation and its reduction

Noise usually has a frequency spectrum of up to 1000 Hz. However, these disturbing frequencies can be specifically avoided thanks to a new concept based on blade-shaped fans that reduce resonance noise. The fan's brushless DC motor also contributes to increased efficiency.
DC fans from Nidec (distributed by Dynetics) are based on 3-phase motors, which are characterised by quiet running and a long service life.
Optimised fan impeller

Impeller design with computational fluid dynamics (CFD)

The design of the impeller requires iterative optimisation. Various simulations are necessary to identify the causes of power loss and noise development, such as blade leakage caused by air turbulence (vortex) and other aerodynamic effects.
In addition, innovative design techniques for fan blades using CFD are used to design rotor cascades for low-noise fans. CFD is a form of numerical analysis that is used to analyse and solve flow problems.

Noise generation and its reduction

Noise usually has a frequency spectrum of up to 1000 Hz. However, these disturbing frequencies can be specifically avoided thanks to a new concept based on blade-shaped fans that reduce resonance noise. The fan's brushless DC motor also contributes to increased efficiency. DC fans from Nidec (distributed by Dynetics) are based on 3-phase motors, which are characterised by quiet running and a long service life.
Optimised fan impeller
11
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