井下双位自锁式电磁铁参数优化及性能分析

Performance analysis and parameter optimization of down-hole bi-position self locking electromgnet

针对井下的恶劣工作环境,为了降低电磁阀能耗,提出了一种利用永磁体自锁的电磁阀。为了提高电磁阀在工作过程中的性能,利用Ansoft Maxwell软件建立电磁铁的分析模型,并对模型进行有限元分析。分别考虑电磁铁衔铁在不同位置、永磁体不同长度情况下,电磁铁的自锁性能和抗振动的能力。针对不同长度的线圈以及衔铁的不同位置,对电磁铁的换向能力进行有限元分析,得到合理的线圈长度。仿真结果分析表明,井下自锁式电磁铁增加永磁体的长度有助于衔铁抗振动能力的提高,但会削弱电磁铁的换向能力。综合考虑上述因素,结合电磁铁的实际尺寸,得到永磁体长度和线圈长度的优化设计参数分别为3mm和21mm。

Aiming at tough environment in the oil and gas well, we proposed a down-hole self-lock solenoid with permanent magnet to reduce power consumption. In order to enhance working performance, the analysis model was established with Ansoft Maxwell software and was simulated by finite element method （FEM）. The electromagnet’s vibration resistance was analyzed for different length of permanent magnet and at different position of armature. The switch capablity is analyzed for different length of permanent magnet and at different position of armature. Finally, the reasonable length of coil is obtained. The simulation result indicates that longer permanent magnet would increase vibration resistance and decrease the switch capablity. Considering the actual size of electromagnet, the optimization length of permanent magnet and coil are 3mm and 21mm, respectively.