Based on the analysis of the stability of the 4qc state equation, the value of mutual inductance should be smaller than that of leakage inductance of the traction windings.

根据四象限变流器状态方程稳定性分析，指出互感值的取值必须小于牵引绕组的漏感值。

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The fitting expression of the tested inductance, winding flux linkage equation, rotating voltage equation, electromagnetic torque equation and their state equations are also presented.

给出测试电感拟合的表达式，推导了绕组的磁链方程、旋转电压方程、电磁转矩方程和状态方程。

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