并对应用于某些情况下的已有等效简化模型进行必要的改进。
Then, an improvement of the equivalent simplified models is presented used in some circumstances.
典型的极化磁系统主要有四种结构，其简化磁路等效数学模型是继电器设计的基础。
The typical polarized magnetic system has mainly four structures and its simplified equivalent magnetic circuit model is the base of the design of the electromagnetic relay.
同时作出了模型参数计算的等效回路图，将复杂机械机构计算简化为电回路计算。
The equivalent circuit for model parameter calculation is also given, so a calculation for complicated mechanism could be simplified to a electrical circuit calculation.
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