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继电器的触头弹跳是无法避免的,它通常是引起电气磨损和材料侵蚀的主要原因。本文利用模态展开形式对航天继电器的两种不同的簧片系统的动态行为进行了分析研究。该动力学模型在悬臂梁系统中使用了Euler-Bernoulli梁理论,其中考虑了电磁系统的驱动力(或驱动力矩),采用Kelvin-Voigt黏弹性体接触模型模拟动静触头间的接触力。采用有限差分法计算簧片系统的非线性偏微分方程对解析结果进行了补充。计算结果表明:随着驱动力(或驱动力矩)的增加,触头的闭合时间会减小,但最大的弹跳高度和弹跳时间有先减小后增大的趋势,故其有一最小值。随着推动杆逐渐靠近触头,触头的闭合时间、最大弹跳高度和时间均有减小的趋势。在今后的设计中,该模型能用作提高继电器性能和减小弹跳的设计工具。
Relay contact bounce is inevitable, it is usually the main cause of electrical wear and material erosion. In this paper, the dynamic behavior of two different reed systems of aerospace relay is analyzed by modal expansion. The dynamics model uses the Euler-Bernoulli beam theory in a cantilever beam system, in which the driving force (or driving torque) of the electromagnetic system is taken into account and the contact force between the moving contact and the static contact is simulated by the Kelvin-Voigt viscoelastic contact model. Finite difference method to calculate the reed system nonlinear partial differential equations of the analytical results were supplemented. The calculation results show that with the increase of driving force (or driving torque), the contact closure time will decrease, but the maximum bouncing height and bouncing time will first decrease and then increase, so it has a minimum value. As the push rod gradually approaches the contact, the closing time of the contact, the maximum bounce height and the time tend to decrease. In future designs, the model can be used as a design tool to improve relay performance and reduce bouncing.