It also shows that two four vector potential can be combined into one four vector potential in the region being free of magnetic charges.
同时还证明在磁荷为零的区域两个四维矢势可以合并为一个。
The four vector control methods of induction machines are introduced . Their merits and drawbacks are analyzed . And it indicates that they are applied in different occasion.
介绍了四种异步电机矢量控制方法，分析了各种方法的优缺点，指出各种方法的适用场合。
The four vector control methods of induction machines are introduced . Their merits and drawbacks are analyzed . And it indicates that they are applied in different occasion.
介绍了四种异步电机矢量控制方法，分析了各种方法的优缺点，指出各种方法的适用场合。
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