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给铁磁性材料充磁后本身是否损失磁能?

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Author:久巨自动化Source:久巨业务部

(问)A:从能量的角度,把铁磁性材料靠近永磁铁再拿开,铁磁性材料有了磁能,那永磁铁中的磁能就少了。是否是这样,机理是什么,现实生活中有这样的例子吗?在用充磁机给一个非永磁体充磁为永磁体的过程中需要电能,原理是否可以运用到永磁铁给另一个非永磁体充磁


充磁机-zt.jpg


(答)Q1: 并没有你想象的那种过程……永磁体本身是不变的这个新磁体的能量在于你把永磁体靠近它的时候,它还是个普通的介磁体,所以相互吸引的效果比较弱;当你把永磁体拿走的时候,它被磁化了,变成了一个磁体,而且N极与你的S极相对(或者反过来),相互吸引的效果变强了,所以你需要做更多的功来拿开这个永磁体。这个差异形成了新磁体的能量。当然如果原来的磁体因为新磁体而被反向磁化了,那的确是会损失一些能量。


实际上磁化这个过程,学习一下磁滞回线会比较明白,铁磁体在强磁场当中反复磁化,会有能量损失。你说的这个磁场的能量其实也来自于磁滞回线上的一个圈。


充磁机.jpg


(答)Q2从能量守恒的角度出发,永磁铁给磁体充磁相对于给磁体做功!或者是永磁铁的能量有一部分传送到新的磁体上了,此时磁体和永磁铁还是还一起!总的能量没有变!如果要将磁体拿开则需要对磁体做额外的功!这样永磁铁的能量就真的损失了!


(答)Q31、充磁后,永磁体是处于充磁体产生的磁场中,势能是下降的。

2、永磁体和充磁体是相互吸引的,二者分开需要做功。如果永磁体在充磁体的磁场中没有发生磁场改变,在二者分开(无限远)后,永磁体的磁能与原先的一样。


久巨自动化让工业制造更美好!


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Article classification: 充磁类问题
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Shenzhen hangshaC Shenzhen Jiujuok Industrial Equipment co., Ltd. (www.jiujuok.com) is  National High-tech Enterprise integrating R&D, manufacturing, and sales of the Dispensing equipmentMagnetization euipment, and Industrial Robot . Over the years, the company has been committed to product research and development and innovation, and has established long-term cooperative relations with a number of universities in China, such as Changsha university of science and technology.Obtained a number of national technology patents and passed "national authoritative testing, quality qualified products" firmly, won "China's independent innovation products" and other honors.The products are widely used in electronics (loudspeaker, mobile phone, computer), automobile, optical device, plastic products and other industries, and are widely favored by the market. Learn More


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