仿真结果表明，此功率因数控制系统在空载和轻载时，可节能30%—50%，本论文为异步电动机的节能运行提供了重要的参考作用。
The simulation result demonstrates that it can save up capacity about 30-50% when there is no load or a little load. This thesis can provide important reference function.
在轻载或空载时由于存在大的功率损耗，双极性PWM控制只能被应用于中、小功率伺服控制系统。
As the existing great power consumption of empty-load or light-load, the bipolar PWM control can be applied only in small or middle power servo control systems.
异步电机是一种为数众多的动力设备，当电机运行于轻载或空载时，其效率和功率因素都很低。
Asynchronous motor is a kind of popular power equipment. When the motor is in light or idle run, the efficiency is quite low.
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