描述

直流力矩電動機總體結(jié)構(gòu)型式有分裝式和內(nèi)裝式兩種。分裝式直流力矩電動機有定子、轉(zhuǎn)子和刷架三大件，轉(zhuǎn)子直接套在負載軸上，轉(zhuǎn)軸和機殼按控制系統(tǒng)要求配制。圖1(a)示意了分裝式結(jié)構(gòu)。內(nèi)裝式直流力矩電動機與一般電動機一樣，把定子、轉(zhuǎn)子、刷架與轉(zhuǎn)軸、端蓋裝成整機，如圖(b)所示。電動機加電壓后，轉(zhuǎn)速為零時的電磁轉(zhuǎn)矩稱為堵轉(zhuǎn)轉(zhuǎn)矩，轉(zhuǎn)速為零的運行狀態(tài)又稱堵轉(zhuǎn)狀態(tài)。一般電機不能長時間運行于堵轉(zhuǎn)狀態(tài)，但力矩電動機經(jīng)常使用于低速和堵轉(zhuǎn)狀態(tài)。電機長時間堵轉(zhuǎn)時，穩(wěn)定溫升不超過允許值時輸出的最大堵轉(zhuǎn)轉(zhuǎn)矩稱為連續(xù)堵轉(zhuǎn)轉(zhuǎn)矩，相應(yīng)的電樞電流為連續(xù)堵轉(zhuǎn)電流。運行轉(zhuǎn)速大于零時輸出轉(zhuǎn)矩小于堵轉(zhuǎn)轉(zhuǎn)矩。力矩電動機機械特性是直線。

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