Abstract
Aimed at the influence of the vibration environment on the performance degradation of AC contactors, the purpose of this study is to investigate the failure mechanism of AC contactors under vibration conditions. During the closing process of AC contactors, the impact energy of the iron core may change due to the vibration stress, which may have an uncertain effect on the parameters of the dynamic response characteristics of the contact, and affect the working performance and service life of AC contactors. In this paper, a double-E AC contactor is selected as the research object. Based on the calculation of the transient magnetic field of the electromagnetic mechanism, an energy distribution model of the AC contactor is established. Based on this, considering the influence of vibrations and the input electrical energy under different closing phase angles, the energy model of the iron core collision under simple harmonic oscillation is investigated. The steady-state vibration energy at different frequencies and accelerations is calculated, and its influence on the dynamic response parameters of the AC contactor is analyzed. Finally, the simulation model is verified by experimental data. The results show that the energy analysis model can effectively reflect and explain the uncertainty of the dynamic characteristics of AC contactors under vibrations, from the perspective of the mechanism.
Highlights
AC contactors are commonly used in the main or large-capacity control circuits for frequent and long-distance operation
In order to verify the accuracy of the calculation and analysis of the simulation model, we have carried out the test of the dynamic characteristics of AC contactor of the same specification
In order to avoid the influence caused by the different closing phase angles and focus on the effect of carried out the practical test of the dynamic characteristics of AC contactor of the same specification
Summary
AC contactors are commonly used in the main or large-capacity control circuits for frequent and long-distance operation. The usage amount and application area of AC contactors keep increasing with the development of social production and technology. The service life of AC contactors is closely related to the dynamic characteristics during the operation. The research on the electromagnetic mechanism of AC contactors is mainly focused on characteristic test devices, simulation calculations, and optimizing designs. The technology and research methods for testing dynamic characteristics of AC contactors are developing rapidly. Researchers achieve a full range of testing and analysis of the dynamic process of the electromagnetic mechanism by designing and improving the dynamic characteristic test device, making the test system performance more stable and reliable while measuring the dynamic parameters more accurately [1,2,3]
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