澳门金沙

比较了铝板、钢板和铜板的屏蔽性能

来源:

  比较了铝板、钢板和铜板的屏蔽性能
  The shielding performance of aluminium plate, steel plate and copper plate were compared.
  1. 铝板通常屏蔽何种范围的电磁波?
  1. What range of electromagnetic waves are usually shielded by aluminium plates?
  2. 使用铝板作为主要电气元件的安装板有什么特别的好处,例如在电气柜中的过滤器?
  2. What are the special advantages of using aluminium plates as mounting plates for major electrical components, such as filters in electrical cabinets?
  3.大家知道铝的渗透率很低。如果一个空间是用铝盖密封的,没有泄漏,那么外磁场的磁力线不会通过这个封闭的空间吗?
  3. We know that aluminium permeability is very low. If a space is sealed with an aluminium cover and there is no leakage, will the magnetic lines of the external magnetic field not pass through the enclosed space?
  1. 一个:
  1. First:
  (1)对于电压高、电流小的干扰源,近场以电场为主,其磁场分量可以忽略;(2)对于低压、大电流干扰源,近场以磁场为主,其电场分量可以忽略;(3)对于较高的频率,或者在远离干扰源的地方(远场条件),无论干扰源本身的特性如何,都可以看作是平面电磁场。此时,电场和磁场不可忽略。对于铝板,电场波在整个频率范围内的屏蔽效率都非常好。平面波的屏蔽效率在整个频段也是可以接受的(0.5mm铝板的屏蔽效率在整个频段至少大于120dB);对于磁场波屏蔽,低频(小于100KHz)的屏蔽效率较差,当大于1MHz时屏蔽效率显著提高。
  (1) For high voltage and low current sources, the electric field is dominant in the near field, and the magnetic field component can be neglected; (2) for low voltage and high current sources, the magnetic field is dominant in the near field, and the electric field component can be neglected; (3) for high frequency or far field conditions, regardless of the characteristics of the source itself, such as the far field condition. Anyway, it can be regarded as plane electromagnetic field. At this time, the electric and magnetic fields can not be neglected. For aluminium plate, the shielding efficiency of electric field wave in the whole frequency range is very good. The shielding efficiency of plane wave is acceptable in the whole frequency band (the shielding efficiency of 0.5 mm aluminum plate is at least more than 120 dB in the whole frequency band); for magnetic field wave shielding, the shielding efficiency of low frequency (less than 100 KHz) is poor, and when it is greater than 1 MHz, the shielding efficiency is significantly improved.
  2. 铝板或铜板主要用于屏蔽100KHz以上的电磁波。至于特别福利,(在我看来)可能还有其他考虑。
  2. Aluminum or copper plates are mainly used to shield electromagnetic waves above 100KHz. As for special benefits, there may be other considerations.
  3.铝板或铜板的渗透性很低。如果空间被铝屏蔽,由于其低渗透性,几乎没有旁路功能。为了获得更好的屏蔽效率的封闭空间,需要使用高导磁率的钢板进行级进屏蔽。这样,当外磁场通过空间时,大部分磁场被高磁导率的钢板(旁路)所转移,从而使空间更干净。

                              铝板生产厂家
  3. The permeability of aluminium or copper sheets is very low. If the space is shielded by aluminium, it has almost no bypass function because of its low permeability. In order to obtain a better shielding efficiency of the enclosed space, it is necessary to use high permeability steel plate for progressive shielding. In this way, when the external magnetic field passes through the space, most of the magnetic field is transferred by high permeability steel plate (bypass), which makes the space cleaner.
  4. 铝板制成的屏蔽屏蔽磁场的影响不如钢板,因为铝渗透率不如钢铁和其他铁磁材料,但有些场合听说铝板可以磁绝缘,主要指的是铝板哪方面的特点?我还想问一下,由于铝的渗透性较低,磁场线是否可以通过铝板。
  4. The influence of shielding magnetic field made of aluminium sheet is not as good as that of steel sheet, because aluminium permeability is not as good as that of steel and other ferromagnetic materials. But in some occasions, it has been heard that aluminium sheet can be magnetically insulated, mainly referring to the characteristics of aluminium sheet. I also want to ask, because of the low permeability of aluminium, whether magnetic field wire can pass through aluminium sheet.
  一个问题:“某些场合”是什么意思?在许多情况下,不可能区分磁分量是大还是无线电分量是主要分量。这就是上面的情况(3)。对于这种情况,我可以使它简单(容易理解)。事实上,材料对电磁波的屏蔽效率不仅取决于材料的渗透性,而且还影响到平面波的屏蔽效率。
  The first question is: What does "in some cases" mean? In many cases, it is impossible to distinguish whether the magnetic component is large or the radio component is the main component. This is the case above (3). In this case, I can make it simple (easy to understand). In fact, the shielding efficiency of materials to electromagnetic waves depends not only on the permeability of materials, but also on the shielding efficiency of plane waves.
  总之,影响屏蔽效率的因素有三个。(2)平面电磁波的磁导率(3)频率;铝或铜的导电性虽小,但比钢板的导电性大。a.对于低频电磁波,钢板对平面波有很好的屏蔽作用(钢板的蒙皮深度小于铝(铜))。B.对于频率大于0.01MHz的平面波,铝或铜具有良好的屏蔽效果。而且很多场合的电磁波频率都大于这个频率范围,所以,很多场合都会听到铝板的屏蔽效果很好。其实,谁优谁劣,基本上看你要屏蔽的电磁波得到的频率基本上是哪个波段。好吧?不同的材料有不同的电磁波频率。
  In short, there are three factors affecting shielding efficiency. (2) Permeability of plane electromagnetic wave (3) frequency; conductivity of aluminium or copper is small, but larger than that of steel plate. A. For low frequency electromagnetic wave, steel plate has a good shielding effect on plane wave (the skin depth of steel plate is less than that of aluminum (copper). B. For plane waves with frequencies greater than 0.01MHz, aluminum or copper have good shielding effect. Moreover, in many cases, the frequency of electromagnetic wave is larger than this frequency range, so the shielding effect of aluminium plate is very good in many cases. In fact, who is better or worse depends basically on the frequency band of the electromagnetic wave you want to shield. Okay? Different materials have different frequencies of electromagnetic waves.
  第二个问题:铝板渗透性低,通过铝板的磁场线很少。你想啊,磁导率,顾名思义,是磁导率的大小,铝板渗透率很低,当然,穷人的磁导率,很多磁力线通过铝板,直接影响铝封闭的内部空间,影响铝盖的内部空间,以免打磁屏蔽的影响。然而,如果这是一个钢板,磁力线接触钢板时,大部分的磁力线将被钢板由于钢板的强磁导率,以免影响钢板的内部空间通过钢板,达到屏蔽的效果。注:以上分析仅考虑渗透率。换句话说,对于以电磁波为主的低频情况。
  Second problem: Aluminum plate has low permeability and few magnetic field lines passing through it. You think, permeability, as the name implies, is the size of the permeability, the permeability of aluminium plate is very low, of course, the permeability of the poor, many magnetic lines through the aluminium plate, directly affect the closed internal space of aluminium, affect the internal space of the aluminium cover, in order to avoid the impact of magnetic shielding. However, if this is a steel plate, when the magnetic line contacts the steel plate, most of the magnetic line will be due to the high permeability of the steel plate, so as not to affect the internal space of the steel plate through the steel plate, to achieve shielding effect. Note: The above analysis only considers permeability. In other words, in the case of low frequencies dominated by electromagnetic waves.
 

在线咨询
XML 地图 | Sitemap 地图