The approach, which takes the ratio of the stator voltage to current as the control criterion, improves the efficiency and power factor of asynchronous motors.

仿真计算及实验结果表明该控制方案可以使异步电动机在不同的负载下均呈现出较高的效率，并且兼顾提高功率因数。

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Compared with the conventional TIG welding machine, this new inverter proves to have much higher efficiency and power factor, less volume and weight, and especially, more precise parameter control.

该焊机由于采用了中频逆变技术，使其效率和功率因数都有较大幅度的提高，不但减小了体积，减轻了重量，而且具有比传统TIG焊机更精密的控制、调节性能等。

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Experiments result shows that this control system increase work efficiency and power factor by applying nearby capacitance compensation theory. The control system processes fine saving energy effect.

实验结果表明该节能控制系统利用就地电容补偿原理，降低了抽油机的总损耗，提高了工作效率和功率因数，具有较好的节能效果。

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