他勵直流電機(jī)

勵磁繞組與電樞繞組無聯(lián)接關(guān)系，而由其他直流電源對勵磁繞組供電的直流電機(jī)稱為他勵直流電機(jī)，

并勵直流電機(jī)

折疊串勵直流電機(jī)

串勵直流電機(jī)的勵磁繞組與電樞繞組串聯(lián)后，再接于直流電源，這種直流電機(jī)的勵磁電流就是電樞電流。

復(fù)勵直流電機(jī)

復(fù)勵直流電機(jī)有并勵和串勵兩個勵磁繞組。若串勵繞組產(chǎn)生的磁通勢與并勵繞組產(chǎn)生的磁通勢方向相同稱為積復(fù)勵。若兩個磁通勢方向相反，則稱為差復(fù)勵。

不同勵磁方式的直流電機(jī)有著不同的特性。一般情況直流電動機(jī)的主要勵磁方式是他勵和串勵，其它勵磁方式，在電子工業(yè)的不斷*下將逐漸被淘汰，直流發(fā)電機(jī)的主要勵磁方式有他勵、并勵和復(fù)勵方式。

直流發(fā)電機(jī)

直流發(fā)電機(jī)是把機(jī)械能轉(zhuǎn)化為直流電能的機(jī)器。它主要作為直流電動機(jī)、電解、電鍍、電冶煉、充電及交流發(fā)電機(jī)的勵磁電源等所需的直流電機(jī)。雖然在需要直流電的地方，也用電力整流元件，把交流電轉(zhuǎn)換成直流電，但從某些工作性能方面來看，交流整流電源還不能取代直流發(fā)電機(jī)。

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