直流電機(jī)是電機(jī)的主要類型之一。一臺(tái)直流電機(jī)即可作為發(fā)電機(jī)使用，也可作為電動(dòng)機(jī)使用，用作直流電機(jī)可以得到直流電源，而作為直流動(dòng)機(jī)，由于其具有良好的調(diào)速性能，在許多調(diào)速性能要求較高的場(chǎng)合，仍得到廣泛使用。
一、直流電機(jī)的用途
1、作電源用-直流電機(jī)，將機(jī)械能轉(zhuǎn)化為直流電能;
2、作動(dòng)力用-直流電機(jī)，將直流電能轉(zhuǎn)化為機(jī)械能;
3、做勵(lì)磁機(jī)用，一般小于10萬(wàn)kW即100MW的單機(jī)同步發(fā)電機(jī)要用直流發(fā)電機(jī)作為勵(lì)磁機(jī)
4、信號(hào)傳遞-直流測(cè)速發(fā)電機(jī)，將機(jī)械信號(hào)轉(zhuǎn)換為電信號(hào);
5、信號(hào)傳遞-直流伺服電動(dòng)機(jī)，將控制信號(hào)轉(zhuǎn)換為機(jī)械信號(hào)。
二、直流電機(jī)的優(yōu)缺點(diǎn)
1、直流電機(jī)的電勢(shì)波形較好，對(duì)電磁干擾的影響小。
2、直流電機(jī)的調(diào)速范圍寬廣，調(diào)速特性平滑。
3、直流電機(jī)過(guò)載能力較強(qiáng)，熱動(dòng)和制動(dòng)轉(zhuǎn)矩較大。
4、由于存在換向器，其制造復(fù)雜，價(jià)格較高。
新聞:濱海新區(qū)多摩川編碼器OIH48-2500-P4-L6-5V原廠
直流電動(dòng)機(jī)的構(gòu)造
分為兩部分：定子與轉(zhuǎn)子。記住定子與轉(zhuǎn)子都是由那幾部分構(gòu)成的，注意：不要把換向極與換向器弄混淆了，記住他們兩個(gè)的作用。
定子包括：主磁極，機(jī)座，換向極，電刷裝置等。
轉(zhuǎn)子包括：電樞鐵芯，電樞繞組，換向器，軸和風(fēng)扇等。
直流電動(dòng)機(jī)四種勵(lì)磁方式各自的特點(diǎn)
直流電動(dòng)機(jī)的性能與它的勵(lì)磁方式密切相關(guān)，通常直流電動(dòng)機(jī)的勵(lì)磁方式有4種：直流他勵(lì)電動(dòng)機(jī)、直流并勵(lì)電動(dòng)機(jī)、直流串勵(lì)電動(dòng)機(jī)和直流復(fù)勵(lì)電動(dòng)機(jī)。掌握4種方式各自的特點(diǎn)：
新聞:濱海新區(qū)多摩川編碼器OIH48-2500-P4-L6-5V原廠
中壓閥公稱壓力PN2.5~6.4MPa的閥門。高壓閥公稱壓力PN1.~8.MPa的閥門。超高壓閥公稱壓力PN大于1MPa的閥門。按介質(zhì)溫度分類：高溫閥-t大于45C的閥門。中溫閥-12C小于t小于45C的閥門。常溫閥-4C小于t小于12C的閥門。低溫閥-1C小于t小于-4C的閥門。超低溫閥t小于-1C的閥門。按閥體材料分類：非金屬材料閥門如陶瓷閥門、玻璃鋼閥門、塑料閥門。
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人為什么鐘愛品，卻不注重高端家具呢?這是在幾年前，不少外國(guó)品牌產(chǎn)生的疑問(wèn)。據(jù)悉，我國(guó)人口超過(guò)13億，有大約75萬(wàn)人活躍于品消費(fèi)上，更多的人愿意花大價(jià)錢買高端手表、精美配飾、箱包，之前卻很少有人愿意把金錢花費(fèi)在家具上。而如今與品消費(fèi)一樣，國(guó)內(nèi)高端家具市場(chǎng)正在緩慢的發(fā)展中。家具市場(chǎng)需求增加當(dāng)物質(zhì)生活水平不斷提高，人們對(duì)于家具裝潢也越來(lái)越重視了，越來(lái)越多的人試圖通過(guò)對(duì)家居的裝修來(lái)彰顯自己的生活態(tài)度以及格調(diào)。
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