基于等效圆环法的电磁铆接有效电磁力计算

Calculation on effective electromagnetic force for electromagnetic riveting based on equivalent circle method

在忽略电阻影响和空气中能量损耗的情况下,运用等效圆环法简化电磁铆接放电线圈与驱动线圈模型,计算自感与互感,推导感应电流与有效电磁力计算公式。并采用ANSYS Electronics Suite有限元软件建立放电线圈与驱动线圈的相互作用模型,通过改变放电电压和放电线圈与驱动线圈之间的距离,对驱动线圈感应电流和有效电磁力进行分析。该条件下的感应电流的分布规律与有效电磁力的分布规律相似,但是,有效电磁力的最大值处在距驱动线圈圆心18 mm的位置;放电电流也在同样的位置达到最大值。两线圈之间距离的减小和放电电压的升高均能使有效电磁力变大。将仿真结果与等效圆环法在该条件下的化简计算所得的数值进行对比验证,结果表明提出的有效电磁力的计算方法正确、结果可靠。

In the case of ignoring the influence of resistance and energy loss in the air,the electromagnetic riveting discharge coil and driving coil model were simplified by the equivalent circle method to calculate the self-inductance and mutual inductance,and the calculation formula of the induced current and the effective electromagnetic force was derived.Then,the interaction model of the discharge coil and the driving coil was built by finite element software ANSYS Electronics Suite,and the induced current and effective electromagnetic force of the driving coil were analyzed by changing the discharge voltage and the distance between the discharge coil and the drive coil.Furthermore,the distribution law of induced current under this condition was similar to the distribution law of effective electromagnetic force,but the position of the maximum value for the effective electromagnetic force was 18 mm from the center of the drive coil,and the discharge current also reached its maximum value at the same position.In addition,both the decrease of the distance between the two coils and the increase of the discharge voltage increased the effective electromagnetic force.The simulation result was compared with the numerical value obtained by the simplified computation of the equivalent circle method under this condition.The results show that the computation method of the effective electromagnetic force proposed is correct,and the result is reliable.