风机型电动机组启动时间一般较长，对电动机定子、转子导体温升不利。
The startup time for the fan type motor is relatively longer, which is unfavorable to the temperature rise of its stator and rotor conductors.
这就把它们和在转子处使用永磁铁而非一套铝或铜导体的同步发动机区分开来。
That distinguishes them from synchronous motors that use a permanent magnet in their rotors instead of a set of aluminium or copper conductors.
尼古拉·特斯拉发明的感应电动机本质上就是一台旋转变压器——首先在电动机的固定钢制外壳（定子）上安装上绕组，然后将导体安装入内轴（转子）。
Tesla's invention is, in essence, a rotating transformer. Its primary windings reside in a stationary steel casing (the stator) and and secondary conductors are attached to an inner shaft (the rotor).
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