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電動機的選擇主要有電動機的類型、結(jié)構(gòu)型式、容量、額定電壓與額定轉(zhuǎn)速。
電動機選擇的基本原則是:
(1)根據(jù)生產(chǎn)機械調(diào)速的要求選擇電動機的種類。
(2)工作過程中電動機容量要得到充分利用。
(3)根據(jù)工作環(huán)境選擇電動機的結(jié)構(gòu)型式。
應(yīng)該強調(diào),在滿足設(shè)計要求情況下優(yōu)先考慮采用結(jié)構(gòu)簡單,價格便宜,使用維護方便的三相交流異步電動機。
正確選擇電動機容量是電動機選擇中的關(guān)鍵問題。電動機容量計算有兩種方法,一種是分析計算法,另一種是統(tǒng)計類比法。分析計算法是按照機械功率估計電動機的工作情況,預選一臺電動機,然后按照電動機實際負載情況做出負載圖,根據(jù)負載圖校驗溫升情況,確定預選電動機是否合適,不合適時再重新選擇,直到電動機合適為止。
電動機容量的分析計算在有關(guān)論著中有詳細介紹,這里不再重復。
在比較簡單、無特殊要求、生產(chǎn)數(shù)量又不多的電力拖動系統(tǒng)中,電動機容量的選擇往往采用統(tǒng)計類比法,或者根據(jù)經(jīng)驗采用工程估算的方法來選用,通常選擇較大的容量,預留一定的裕量。
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