原创软磁铁氧体磁芯的检测方法

 2009-3-1 21:46  8176 18 18 分类: 工程师职场

软磁铁氧体是一种非金属磁性材料，具有容易磁化，又容易退磁的特性。用它做成的铁心，品种繁多，用途广泛。 一、按工作频率分       低频：几百Hz至几百KHz；       中频：几百KHz至2MHz；       高频：2~150 MHz；       甚高频：150~1000 MHz 二、按材料分       材料牌号为：MXO—锰锌铁氧体；NXO—镍锌铁氧体；NQ—镍铅铁氧体；NGO—镍锌高频铁氧体；GTO—甚高频铁氧体 <table style="border:medium none;border-collapse:collapse;" border="1" cellpadding="0" cellspacing="0"><tbody><tr style="height:30.1pt;"><td style="border:1pt solid;padding:0cm 5.4pt;width:86.4pt;height:30.1pt;background-color:transparent;" valign="top" width="115">     参数型号        </td><td style="border-style:solid solid solid none;border-color:rgb(236,233,216);border-width:1pt 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;height:30.1pt;background-color:transparent;" valign="top" width="78"> 起始磁导率u </td><td style="border-style:solid solid solid none;border-color:rgb(236,233,216);border-width:1pt 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;height:30.1pt;background-color:transparent;" valign="top" width="94"> 居里温度（℃） </td><td style="border-style:solid solid solid none;border-color:rgb(236,233,216);border-width:1pt 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;height:30.1pt;background-color:transparent;" valign="top" width="94"> 电阻率（欧姆*㎝） </td><td style="border-style:solid solid solid none;border-color:rgb(236,233,216);border-width:1pt 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;height:30.1pt;background-color:transparent;" valign="top" width="94"> 磁饱和磁通密Bs（mT） </td><td style="border-style:solid solid solid none;border-color:rgb(236,233,216);border-width:1pt 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;height:30.1pt;background-color:transparent;" valign="top" width="94"> 工作频率f（MHZ） </td></tr><tr><td style="border-style:none solid solid;border-color:rgb(236,233,216);border-width:medium 1pt 1pt;padding:0cm 5.4pt;width:86.4pt;background-color:transparent;" valign="top" width="115"> MXO-2000 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;background-color:transparent;" valign="top" width="78"> 2000 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 150 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 1*10^2 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 400 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 0.5 </td></tr><tr><td style="border-style:none solid solid;border-color:rgb(236,233,216);border-width:medium 1pt 1pt;padding:0cm 5.4pt;width:86.4pt;background-color:transparent;" valign="top" width="115"> NXO-20 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;background-color:transparent;" valign="top" width="78"> 20 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 400 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 1*10^6 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 200 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 50 </td></tr><tr><td style="border-style:none solid solid;border-color:rgb(236,233,216);border-width:medium 1pt 1pt;padding:0cm 5.4pt;width:86.4pt;background-color:transparent;" valign="top" width="115"> NQ-10 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;background-color:transparent;" valign="top" width="78"> 10 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 400 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 无穷大 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 180 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 300 </td></tr><tr><td style="border-style:none solid solid;border-color:rgb(236,233,216);border-width:medium 1pt 1pt;padding:0cm 5.4pt;width:86.4pt;background-color:transparent;" valign="top" width="115"> NGO-5 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;background-color:transparent;" valign="top" width="78"> 5 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 350 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 无穷大 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 60 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 300 </td></tr><tr><td style="border-style:none solid solid;border-color:rgb(236,233,216);border-width:medium 1pt 1pt;padding:0cm 5.4pt;width:86.4pt;background-color:transparent;" valign="top" width="115"> GTO-16 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:58.8pt;background-color:transparent;" valign="top" width="78"> 16 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 200 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.2pt;background-color:transparent;" valign="top" width="94"> 无穷大 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 200 </td><td style="border-style:none solid solid none;border-color:rgb(236,233,216) rgb(236,233,216);border-width:medium 1pt 1pt medium;padding:0cm 5.4pt;width:70.25pt;background-color:transparent;" valign="top" width="94"> 700 </td></tr></tbody></table> 软磁铁氧体磁芯的检测方法    从上表可以看出，不同频率的软磁铁氧体磁芯具有不同的电阻率。根据电阻率的明显不同，使用万用表的电阻档进行检测，很容易将中频、高频和甚高频软磁铁氧体区分开。    具体检测方法：将万用表置于R*1k档，先在被测软磁铁氧体上确定a、b两个相距约10mm的测量点，然后将两表跨接在a、b两点上测量出电阻值Rab为。若Rab小于几百欧姆，即为中频软磁铁氧体磁芯；Rab为几十k欧姆至几百k欧姆，则是高频软磁体氧体磁芯；Rab为无穷大，即是甚高频软磁铁氧体磁芯。     注意：使用万用表表笔的金属笔尖直接接触到铁氧体，这样才能准确测出实际电阻值。测试点应该选在铁氧体的端面上。

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