In this article, it is pointed out that calculating induced electric field caused by variable magnetic field in constant velocity by analogical method is a simple method.

用类比方法来计算以恒定速率变化的磁场产生的感应电场是一个简便的方法。

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By means of study on velocity field constant in flue, a method used to measure average velocity of flue gas was presented.

通过对烟道“速度场常数”的研究，提出了利用速度场常数监测烟道烟气平均流速的方法，同时研制出速度场常数自动检测装置。

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Then a vector control method with speed closed-loop and magnetic linkage closed loops put forward, which is based on the constant velocity by means of stator flux-oriented vector control.

在基于定子磁场定向的矢量控制恒线速运行控制方案的基础上，提出了一个速度闭环、磁链闭环的矢量控制方案。

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