Rethinking the cpu fan

Yen Sun Technology has developed a fan where all the electronics and magnets have been moved to a ring on the ‘outside’ of the fan.

The trouble with fans, and computer fans specifically, is that there’s rarely anything interesting to say about them. Beyond differences in factors like blade profile, computer fans have the same basic architecture – with the rotating blades spun around a central core (the motor) using a magnetic field.

Taiwanese manufacturer, Yen Sun Technology, has rethought this design and developed a fan where all the electronics and magnets have been moved to a ring on the ‘outside’ of the fan.

One of the flaws in conventional fan design is that cramming all of the electronics into the centre creates a deadzone directly over the middle of the heat sink, usually the spot where you need the most airflow.

With YS Tech’s Tip-Magnetic Driving Fan (TMD), the impeller blades are surrounded by a ring studded with 12 magnets, which are acted upon by four coils located at the corners of the fan’s frame.

By relocating the motor, YS Tech has reduced the size of the motor hub area by around 75%, increased the airflow and static pressure, and brought the air stream directly to the centralised heat source. The company boldly claims that the TMD FAN ‘improves the efficiency of heat dissipation by at least 15%.’

Locating the motor at 4 corners also expands the room for winding, enabling lower power consumption and higher torque.

Also, because the outer ring surrounds the tips of the fan blades, YS Tech claims that the major noise source of an impeller is eliminated.

The first models of the TMD fan are 7cm units, although 6 and 8 cm versions are said to be in the pipeline.

The unit, which costs around 50% more than existing high-quality conventional fans, is available in the UK through Lapicon Electronics.