電磁控制擺盪式風量增流器之研究

Abstract

電磁控制擺盪式風量增流器是一種應用於隨身電子商品之小型的散熱元件，有低功耗、震動噪音小、體積小等優點。電磁控制擺盪式風量增流器的原理係利用磁鐵與電磁線圈的磁場相互作用，使扇葉上下振動產生氣流。因此扇葉是影響風速大小重要的原件，對於扇葉的材質、厚度、形狀與共振頻率是設計中重要的參數，利用共振頻率使扇葉尖端位移增大與設計適合的扇葉形狀達到良好的風速。本研究將功耗限制小於0.25W，使用數值模擬與實驗的方法探討:1.扇葉相關參數包括材質、厚度、扇葉形狀、共振頻率、尖端位移與風速間的關係，2.電磁致動器所需電壓與電流。研究結果顯示，於適合的扇葉形狀，共振頻率與扇葉尖端位移皆會比未修剪之扇葉大，而使風速上升。本研究所探討的扇葉材質Mylar與Aluminum1050於限制功耗0.25W以下，並在適合的扇葉形狀，由於Aluminum1050扇葉的共振頻率與尖端未移高於Mylar扇葉，因此風速較佳可達1.81m/s。本研究在模擬與實驗上的結果對電磁控制擺盪風量增流器提供更佳設計參數。

Application of electromagnetic control swing blade blower is one of the major objectives of this study. Fan of this type consumes low power, has low noise and vibration, small size, makes it suitable for application in consumer electronic products. The main principle is the interaction between permanent magnet and coil magnetic field, drives fan blade to swing thus increase the volume of wind flow. Therefore, the fan blade design is one of the major factor in wind velocity. In this study, fan materials, fan thickness, fan shape, and the resonance frequency are the design parameters considered.With proper resonance frequency, suitable fan shape, air flow can be greatly increased.We use numerial simulation and experiment to study various fan blade related parameters include: 1. materials, thickness, fan shape, resonance frequency, fan tip displacement on the related to wind velocity, 2. Power consumption of the electromagnetic actuator within 0.25W. Numerial simulation and experiment results show that trimming fan blade area, the resonance frequency and the tip displacement are increased, therefore with proper fan shape Aluminum1050 fan has higher wind speed, up to 1.81m/s. Numerial simulation and experiment results provide better understanding of the electromagnectic swing blade blower design.