单稳态永磁接触器集成化磁链闭环控制技术

Integrated Flux Closed Loop Control Technology for Monostable Permanent Magnet Contactor

鉴于单稳态永磁接触器现有的控制方案存在成本高、可靠性低且优化困难等缺陷,该文提出一种集成化磁链闭环控制方案。首先,将电机传动领域的专用集成功率芯片应用到单稳态永磁接触器的智能控制中,设计其集成驱动电路;在此基础上,采用磁链闭环直接控制接触器的总磁链,在合闸过程中仅需设置一较小的恒定磁链参考值,即可实现自动弱磁,防止合闸末期永磁力过大造成严重的触头弹跳;在分闸过程中仅需设置总磁链参考值为0,即可使电磁磁链实时抵消永磁磁链,防止产生剩余吸力,造成分断速度降低,进而提高分闸性能。该文提出的方案既简化了单稳态永磁接触器硬件控制电路的设计,又降低了其优化控制的难度,对高性能永磁接触器的工程推广具有参考价值。

In this paper,an integrated flux closed-loop control scheme for a monostable permanent magnet contactor is proposed for the first time,considering that the existing control schemes have defects such as high cost,low reliability and difficulty in optimization.First,the special integrated power chip used in the field of motor drive is applied to the intelligent control of the permanent magnet contactor,and its integrated drive circuit is designed.On the basis of integrated drive circuit,the total flux of the contactor is directly controlled by the flux closed-loop.Therefore,in the closing process,by simply setting a small constant reference flux value,it can automatically achieve the flux weakening control to prevent serious contact bouncing caused by excessive permanent magnetic force at the end of closing process.Finally,in the breaking process,setting the reference value of the total flux to zero allows the electromagnetic flux linkage to counteract the permanent magnet flux linkage in real-time,thus avoiding a decrease in the breaking speed caused by residual suction,and ultimately improving the closing performance.The scheme proposed in this paper not only simplifies the hardware control circuit of the monostable permanent magnet contactor,but also reduces the difficulty of its optimal control,which is of great significance to the popularization of high-performance permanent magnet contactors.