但缺陷明显，主要反映效率非常低，它以增加转差功率的消耗来换取转速的降低。
But it is obvious that its efficiency is extremely low, which results from increasing the power consumption. The slower rotational speed, the lower efficiency.
该方法是通过调节转子回路附加电阻的有级调速，难以实现平滑地调速，而且调节性能差，调速过程中大量的转差功率通过转子回路电阻转化为热能消耗掉了。
This method regulates speed by changing the number of steps of the additional resistor in the rotor circuit, so it's hard to realize smooth speed-regulation, also its performance is poor.
从异步电机的稳态等效电路出发，推导出了功率因数与转差角频率之间的关系。
Based on equivalent circuit of asynchronous motor in stable state, the relationship between power factor and slip Angle frequency was deduced.
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