Field acceleration method is a new control method for induction motor. Its electro-magnetic process can be analysed with the transient equivalent circuit.

磁场加速法是一种新型、高性能的感应电动机控制方法，其电磁过程可用暂态等值电路进行分析。

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Introducing the principle, construction and technological parameters of machine tool changement. This paper calculates some design data such as electro-magnetic induction circuit and coil.

介绍机床改装原理、结构和技术参数，对电磁感应器磁路及电磁线圈参数进行了有关的计算。

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According to the work of magnetic force, the relationship between induction electro motive force and the energy change in magnetic field is analysed.

根据磁力做功的特点，通过对感应电动势与磁场能量变化关系的分析，得出磁力做功是磁场能量改变的量度、电磁感应现象是能量转换的过程的结。

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