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交流同步電動(dòng)機(jī)

感應(yīng)電動(dòng)機(jī)的工作特性

發(fā)布日期:2022-04-18 點(diǎn)擊率:64


感應(yīng)機(jī)的工作特性是指在額定電壓,定頻率條件下,電動(dòng)機(jī)的轉(zhuǎn)速n、定子電流I1、功率因數(shù)、電磁轉(zhuǎn)矩T、效率等與輸出功率P2的關(guān)系。即:

  



 


  2、電流特性:

  隨負(fù)載的增大而增大,空載時(shí),有一空載勵(lì)磁電流Im。

  3、功率因數(shù)特性:



  感應(yīng)機(jī)的總阻抗是電感性的,其功率因數(shù)總是滯后的。



  4、電磁轉(zhuǎn)矩特性:


  近似為一條斜率為1/Ω的直線。


  5、效率特性:



  可變損耗,不可變損耗;二者相等時(shí),效率達(dá)最大值。

  二、工作特性的測(cè)取:

  直接負(fù)載法或等值電路計(jì)算。


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