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Development of the Cooling System for MPU of Mobile Personal Computer

移动个人电脑MPU冷却系统的研制

基本信息

批准号：
13555047
负责人：
FUKANO Tohru
金额：
$ 1.09万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555047/
关键词：
Fan cooling Mobile PC Cross flow fan Axial flow fan Centrifugal fan Sound pressure level ファン騒音横流ファン

项目摘要

Mobile personal computers are developing quickly in miniaturization with high performance. With this direction heat generation from the MPU will become higher and higher. And in near future it is supposed to become twice and triple times of the present value. And therefore the high heat generation must be taken into consideration in thermal design of such mobile computers. Recent investigation shows that the heat can be distributed by use of a small size heat pipes. The accumulated heat within the case of the computer, however, must be eventually transferred out of the case by use of some kinds of a fan, which is estimated to be an economic way to solve this problem. In the desk-top mobile computer with a 15〜17 inch display there is fortunately space to set such kind of a ventilating fan.The purpose of the present research is to develop especially small fan with low noise and enough aerodynamic performance. According to a preliminary experiment the noise generated from such a small fan is so low that a conventional sound measuring system is not useful and the input-power is too small to measure. And we proposed to make up a code to measure ultra-low noise level. Now those problems are discussed in a new committee the members of which consisted of the industry, official and learned worlds.We have investigated the noise and fluid-dynamic characteristics and it is clarified that even in the ultra small fans each axial, centrifugal and cross-flow fan has their own peculiar characteristics, however, with quite low efficiency. We cannot have commercial instruments to measure precisely such a small input power. And we could not attain the final object of this project. But we already started to develop new instrument to measure axial torque accurately and we will arrive the final goal very soon.

移动个人计算机正朝着小型化、高性能的方向迅速发展。在这个方向上，微处理器产生的热量会越来越高。在不久的将来，它应该是现值的两倍或三倍。因此，在这类移动计算机的热设计中必须考虑到高发热量的问题。最近的研究表明，利用小尺寸的热管可以分散热量。然而，计算机机箱内积累的热量最终必须通过使用某种风扇转移出去，这估计是解决这个问题的一种经济方法。在15 ~ 17英寸显示器的台式移动电脑上，幸运的是有空间设置这样一个通风机。本课题的研究目的是研制具有低噪声和足够气动性能的特小型风机。根据初步实验，这种小风扇产生的噪声非常低，以至于传统的声音测量系统无法使用，并且输入功率太小而无法测量。并提出了一种超低噪声级测量的编码方法。现在，这些问题正在一个由工业界、官方和学术界组成的新委员会中讨论。通过对噪声和流体动力学特性的研究，发现即使在超小型风机中，轴流、离心和横流风机各有其独特的特性，但效率很低。我们没有商业仪器来精确测量如此小的输入功率。我们无法达到这个项目的最终目标。但是我们已经开始开发新的仪器来精确地测量轴向转矩，我们很快就会达到最终的目标。