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【单选题】
.与通用型异步电动机相比变频调速专用电动机的特点是:( )。A.
外加变频电源风扇实行强制通风；加大电磁负荷的裕量；加强绝缘
B.
U/f控制时磁路容易饱和；加强绝缘；外加变频电源风扇实行强制通风
C.
外加变频电源风扇实行强制通风；加大电磁负荷的裕量；加强绝缘
D.
外加工频电源风扇实行强制通风；加大电磁负荷的裕量；加强绝缘
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