描述

罩極式異步電動機中的主磁通包括兩部分：①通過磁極未罩部分磁通φA’，②通過磁極被罩部分磁通。為了說明這兩部分磁通的相應(yīng)關(guān)系，我們畫一個相位圖，如圖1b)所示。相位圖中，EK電動勢從是由磁通φB感應(yīng)而在短路環(huán)中產(chǎn)生的電動勢，EK比φB落后90°相位。短路環(huán)像任何一個閉合繞組一樣，都有漏電感，因此由EK產(chǎn)生的電流IK要比EK落后一個相位角。由于IK的作用，在極權(quán)被罩部分中產(chǎn)生的磁通為φK，忽略鐵損耗時，φK與IK同相位。φK與φA”合成即為φB。從相量圖上看出，φA’與φB在時間上相差了一個相位差角，φA’領(lǐng)先一個電角度。

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