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根据电磁场理论，把稀土永磁齿轮传动的磁场作用分为等效电流间作用、等效电流与介质磁化场间作用和两个介质磁化场间的作用３ 部分。在利用积分方程法导出的磁场性能计算公式的基础上，导出了永磁齿轮传动中转矩的计算公式，并对转矩特性进行了分析。
According to the theory of electromagnetic field, the magnetic field effect of rare earth permanent magnet gear drive is divided into three parts: the role of equivalent current, the role of equivalent current and medium magnetization field and the interaction between two medium magnetization fields. Based on the calculation formula of magnetic field derived from integral equation method, the formula of torque in permanent magnet gear drive is deduced and the torque characteristics are analyzed.