Simulation research has been taken for its operation performance and the result indicated that BDFM was very suitable for the use of variable frequency adjusting speed.

然后简要分析了无刷双馈电机的基本原理，并对其运行特性进行了仿真研究，结果表明无刷双馈电机非常适合作为变频调速用电机。

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The configuration and variable frequency adjusting speed of water circulation pump in city heat-supply system are introduced, and the effects of energy saving are analyzed.

对城市供热系统中循环水泵的配置及变频调速进行了介绍，分析了其节能效果。

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The variable polarity power supply can satisfy the welding process of the aluminum and aluminum alloy by adjusting the current frequency, positive and negative current time and amplitude value.

调节正负半波的幅值、频率及占空比能满足铝及铝合金的焊接工艺要求。

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