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【单选题】
三相感应电动机定子绕组,丫接法,接在三相对称交流电源上,如果有一相断线,气隙中产生的基波合成磁动势为( )。
A.
不能产生磁动势
B.
圆形旋转磁动势
C.
椭圆形旋转磁动势
D.
脉振磁动势
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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