Cooling ability of heat sinks with oscillating-fan models using elect romagnetic force

In this study, an oscillating-fan cooling device using electromagnetic force has been proposed. The device consists of two oscillating-fans flapping back and forth. It requires only one electromagnet and two elastic blades with one magnet on each of them. The electromagnet and two elastic blades are situated on a base and arranged accordingly. And thus, the electromagnetic force generated by the electromagnet can actuate the blades. The main advantage of this cooling device compared to a rotary fan is its simple structure because there is no bearing and motor in the cooling device. Moreover, the simplicity of the device makes it a highly reliable and low cost cooling device. The driving current can be either DC PWM or AC under 8 V - 12 V so it is compatible to most electronic devices. The dimensions of the model under operation is 55 mm (L) * 50 mm (W) * 15 mm (H). The thermal resistance of a small heat sink can be decreased from 4.37 to 1.16 by using the combination of two blowers while consuming 2.4 W. Model - A can decreases the thermal resistance from 4.37 to 1.27 and consumes 25% power of that of the two blowers consume.