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【多选题】
关于直流电机,以下论述正确的是( )。A.
电枢绕组是直流电机的核心部件，电枢绕组在磁场中旋转产生感应电动势；
B.
直流电机中，电枢感应电动势和感应电流的乘积是电机的电磁功率；
C.
电枢磁动势仅和电枢电流大小有关，不受电刷位置的影响；
D.
电枢绕组是直流电机实现 机电能量 转换的关键部件。
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