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.
本文研究分析了转差频率型矢量控制和基于无功功率的无速度传感器矢量控制。
In this thesis, a slid frequency vector control system and a speed sensorless vector control system based on reactive power are investigated and analyzed.
控制电机的功率因数实质上是对电机转差频率进行控制，使效率保持在最优值。
We find that the principle of the strategy is that it makes the efficiency optimal essentially by controlling the slip frequency.
从异步电动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.
从异步电动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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