描述
罩极式异步电动机中的主磁通包括两部分:①通过磁极未罩部分磁通φA’,②通过磁极被罩部分磁通。为了说明这两部分磁通的相应关系,我们画一个相位图,如图1b)所示。相位图中,EK电动势从是由磁通φB感应而在短路环中产生的电动势,EK比φB落后90°相位。短路环像任何一个闭合绕组一样,都有漏电感,因此由EK产生的电流IK要比EK落后一个相位角。由于IK的作用,在极权被罩部分中产生的磁通为φK,忽略铁损耗时,φK与IK同相位。φK与φA”合成即为φB。从相量图上看出,φA’与φB在时间上相差了一个相位差角,φA’领先一个电角度。
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