Due to the influence of material characteristics and winding power, single output electromagnet has limited ability to improve the dynamic characteristic of electro-hydraulic valve. Therefore, an electromechanical con...Due to the influence of material characteristics and winding power, single output electromagnet has limited ability to improve the dynamic characteristic of electro-hydraulic valve. Therefore, an electromechanical converter with double push rods is proposed in this paper, which can simultaneously output two electromagnetic forces, can push or pull the valve core and sleeve according to the current direction and realize rapid operation of load. According to the electromagnetic principle and the magnetic circuit analysis method, the mathematical model and equivalent circuit of the electromechanical converter with double push rods are established. Through the finite element simulation model of the electromechanical converter with double push rods with the same magnetization directions, the changing rules of its magnetic field distribution and force–displacement behaviors are studied and analyzed. According to the analysis results, the electromagnetic mechanical parameters and mechanical structure of the electromechanical converter with double push rods are determined, and the prototype is made. The test platform for the push-pull characteristics of the electromechanical converter with double push rods is built, and its static and dynamic characteristics are tested and analyzed. The results show that the thrust and pull output characteristics of the internal and external push rods are basically consistent with the simulation output, and proportional to the current density of the coil;the push-pull hysteresis of internal and external push rods output force is less than 5%;and the dynamic time response characteristics of the displacement and force are obtained. The hysteresis e ect of output force is improved e ectively through the H bridge drive control circuit modulated by PWM. Compared with the displacement response of a singlewinding electromagnet with a similar volume, it can e ectively improve the dynamic displacement response. Followup work will further optimize the structure of the electromechanical converter展开更多
为研制用于驱动大流量伺服比例阀先导级的高响应电-机械转换器,提出采用异型永久磁铁励磁的动圈式直线电机(moving coil linear motor,MCLA)结构方案,给出设计准则,采用有限元计算方法分析磁路特征,计算结果表明,采用异型永久磁铁较规...为研制用于驱动大流量伺服比例阀先导级的高响应电-机械转换器,提出采用异型永久磁铁励磁的动圈式直线电机(moving coil linear motor,MCLA)结构方案,给出设计准则,采用有限元计算方法分析磁路特征,计算结果表明,采用异型永久磁铁较规则形状可提高驱动力7%以上。在此基础上,设计了驱动大流量伺服比例阀先导级的动圈式直线电机,并制造出样机,建立了测试系统,对样机的动静态特性进行试验测试,试验结果验证了设计计算的正确性,试验结果表明所研制的样机性能可以满足高响应大流量伺服比例阀先导级驱动要求。展开更多
基金Supported by National Natural Science Foundation for Young Scientists of China(Grant No.51505317)Shanxi Provincial Natural Science Foundation of China(Grant No.201601D102039)
文摘Due to the influence of material characteristics and winding power, single output electromagnet has limited ability to improve the dynamic characteristic of electro-hydraulic valve. Therefore, an electromechanical converter with double push rods is proposed in this paper, which can simultaneously output two electromagnetic forces, can push or pull the valve core and sleeve according to the current direction and realize rapid operation of load. According to the electromagnetic principle and the magnetic circuit analysis method, the mathematical model and equivalent circuit of the electromechanical converter with double push rods are established. Through the finite element simulation model of the electromechanical converter with double push rods with the same magnetization directions, the changing rules of its magnetic field distribution and force–displacement behaviors are studied and analyzed. According to the analysis results, the electromagnetic mechanical parameters and mechanical structure of the electromechanical converter with double push rods are determined, and the prototype is made. The test platform for the push-pull characteristics of the electromechanical converter with double push rods is built, and its static and dynamic characteristics are tested and analyzed. The results show that the thrust and pull output characteristics of the internal and external push rods are basically consistent with the simulation output, and proportional to the current density of the coil;the push-pull hysteresis of internal and external push rods output force is less than 5%;and the dynamic time response characteristics of the displacement and force are obtained. The hysteresis e ect of output force is improved e ectively through the H bridge drive control circuit modulated by PWM. Compared with the displacement response of a singlewinding electromagnet with a similar volume, it can e ectively improve the dynamic displacement response. Followup work will further optimize the structure of the electromechanical converter
文摘为研制用于驱动大流量伺服比例阀先导级的高响应电-机械转换器,提出采用异型永久磁铁励磁的动圈式直线电机(moving coil linear motor,MCLA)结构方案,给出设计准则,采用有限元计算方法分析磁路特征,计算结果表明,采用异型永久磁铁较规则形状可提高驱动力7%以上。在此基础上,设计了驱动大流量伺服比例阀先导级的动圈式直线电机,并制造出样机,建立了测试系统,对样机的动静态特性进行试验测试,试验结果验证了设计计算的正确性,试验结果表明所研制的样机性能可以满足高响应大流量伺服比例阀先导级驱动要求。
