沟通铁芯线圈
1、电磁联络
当外加电压u时,线圈中发作沟通励磁电流i和磁动势Ni,发作交变磁通:
主磁通→主磁电动势
漏磁通→漏磁电动势
![](http://www.591dg.com/uploads/allimg/blog/0eblvzpwxhd.gif)
![](http://www.591dg.com/uploads/allimg/blog/q2tzl4u5plw.gif)
![](http://www.591dg.com/uploads/allimg/blog/mxtiudymq50.gif)
![](http://www.591dg.com/uploads/allimg/blog/ppqurbpz25m.gif)
依据KVL,铁芯线圈的电压平衡方程式是:
![](http://www.591dg.com/uploads/allimg/blog/zbqy5mwwwzv.gif)
因为线圈电阻上的压降
![](http://www.591dg.com/uploads/allimg/blog/w0uub54st4k.gif)
![](http://www.591dg.com/uploads/allimg/blog/fhubveveoft.gif)
![](http://www.591dg.com/uploads/allimg/blog/x3u0nhsng50.gif)
![](http://www.591dg.com/uploads/allimg/blog/aml4sjki4kg.gif)
当u是正弦电压时,通常
![](http://www.591dg.com/uploads/allimg/blog/wu0pbo44efc.gif)
![](http://www.591dg.com/uploads/allimg/blog/3mgldk22r1p.gif)
![](http://www.591dg.com/uploads/allimg/blog/hx4wvy0ofjz.gif)
设主磁通
![](http://www.591dg.com/uploads/allimg/blog/so4hgkiikyb.gif)
![](http://www.591dg.com/uploads/allimg/blog/r5rlf2tdk0p.gif)
![](http://www.591dg.com/uploads/allimg/blog/1cm22uvzxk1.gif)
![](http://www.591dg.com/uploads/allimg/blog/3tdvnraglrp.gif)
![](http://www.591dg.com/uploads/allimg/blog/fj5hgddbrdl.gif)
![](http://www.591dg.com/uploads/allimg/blog/xh3swl3mq5a.gif)
则
![](http://www.591dg.com/uploads/allimg/blog/as1fhr1wylr.gif)
上式为剖析沟通磁路的首要公式,有必要紧记!
(1)
![](http://www.591dg.com/uploads/allimg/blog/jdo3kogadrv.gif)
![](http://www.591dg.com/uploads/allimg/blog/oev2yt0jm5z.gif)
![](http://www.591dg.com/uploads/allimg/blog/vg0ovnzcfsc.gif)
![](http://www.591dg.com/uploads/allimg/blog/iuerqyaay45.gif)
(2)当
![](http://www.591dg.com/uploads/allimg/blog/apdxln4hthm.gif)
![](http://www.591dg.com/uploads/allimg/blog/d1pkrxuy1zy.gif)
(3)当
![](http://www.591dg.com/uploads/allimg/blog/gruolmas1rw.gif)
![](http://www.591dg.com/uploads/allimg/blog/vhrt3zfoxs5.gif)
该式标明:在疏忽线圈电阻与漏磁通的条件下,当线圈匝数N与电源频率f必守时,主磁通的幅值
![](http://www.591dg.com/uploads/allimg/blog/niherqvfr5y.gif)
2、功率联络
沟通铁芯线圈中的功率损耗包含铜损和铁损两有些。
所谓铜损
![](http://www.591dg.com/uploads/allimg/blog/mg14lkrlagn.gif)
![](http://www.591dg.com/uploads/allimg/blog/fehx1fzr1t0.gif)
所谓铁损
![](http://www.591dg.com/uploads/allimg/blog/hpvlfezujti.gif)
(1)磁滞损耗
![](http://www.591dg.com/uploads/allimg/blog/h5gcposeggw.gif)
(2)涡流损耗
![](http://www.591dg.com/uploads/allimg/blog/bdtzg3v0mmy.gif)
(3)削减铁损的办法:
① 在铁碳合金中参加硅元素,制成硅钢,可使磁滞回线面积变小,减小磁滞损耗;
②将资料顺磁通方向切成相互绝缘的薄片可使涡流的电阻大大增加,以减小涡流损耗。
综上所述,沟通铁芯线圈的功率标明为
![](http://www.591dg.com/uploads/allimg/blog/xyrzxtxtg3d.gif)
上一篇:绝缘资料的电气功用
下一篇:功率因数及其跋涉
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