单稳态永磁真空断路器驱动线圈反电势计算方法研究

Study on the Calculation Method of the Anti-potential of the Driving Coil of the Monostable Permanent Magnet Vacuum Circuit

永磁操动机构断路器的分合闸运动特性是永磁体的磁场、驱动线圈的磁场、运动部件质量及各种反力共同作用的结果。在动铁芯运动过程中,磁场不断变化,驱动线圈的电流受到线圈电感和线圈中反电势的阻碍,因此区分永磁操动机构驱动线圈中电感和反电势,有助于确定合理的永磁真空断路器控制策略。将线圈等值为非线性电感和反电势串联,前者是原线圈电感和永磁体磁场的作用结果,后者是线圈反电势的形式。经过推导,得到了2种反电势的计算方法,分别对分合闸过程中的反电势变化情况进行计算,并比较2种计算方法的结果,验证2种反电势计算方法的可行性。

The opening and closing motion characteristics of the permanent magnet operating mechanism circuit breaker are the result of the magnetic field of the permanent magnet, the magnetic field of the driving coil, the mass of the moving parts, and various reaction forces. During moving iron core movement, with the magnetic field changes constantly, the current of the driving coil is hindered by the inductance of the coil and the back electromotive force (EMF) in the coil. Distinguishing the inductance and back EMF in the driving coil of the permanent magnet operating mechanism, which helps to determine the reasonable control strategy of the permanent magnet vacuum circuit breaker. In this paper, the coil is regard as a series of nonlinear inductance and back EMF. The front part is the result of the original coil inductance and the permanent magnet magnetic field, and the latter part is the form of the coil back EMF. Two kinds of calculation methods of back EMF are obtained by derivation, and the back EMF changes in the process of opening and closing are calculated separately. Compare the results of the two calculation methods and verify the feasibility of the two back-potential calculation methods.